diff --git a/.editorconfig b/.editorconfig
new file mode 100644
index 0000000..38ea8b5
--- /dev/null
+++ b/.editorconfig
@@ -0,0 +1,92 @@
+root = true
+
+[*]
+charset = utf-8
+end_of_line = crlf
+indent_style = space
+indent_size = 4
+insert_final_newline = true
+trim_trailing_whitespace = true
+
+[*.cs]
+# Indentation
+indent_size = 4
+tab_width = 4
+
+# New line preferences
+csharp_new_line_before_open_brace = all
+csharp_new_line_before_else = true
+csharp_new_line_before_catch = true
+csharp_new_line_before_finally = true
+csharp_new_line_before_members_in_object_initializers = true
+csharp_new_line_before_members_in_anonymous_types = true
+csharp_new_line_between_query_expression_clauses = true
+
+# Spacing
+csharp_space_after_cast = false
+csharp_space_after_keywords_in_control_flow_statements = true
+csharp_space_between_method_call_parameter_list_parentheses = false
+csharp_space_between_method_declaration_parameter_list_parentheses = false
+csharp_space_before_colon_in_inheritance_clause = true
+csharp_space_after_colon_in_inheritance_clause = true
+csharp_space_around_binary_operators = before_and_after
+csharp_space_between_method_declaration_empty_parameter_list_parentheses = false
+csharp_space_between_method_call_name_and_opening_parenthesis = false
+csharp_space_between_method_call_empty_parameter_list_parentheses = false
+
+# Wrapping
+csharp_preserve_single_line_statements = true
+csharp_preserve_single_line_blocks = true
+
+# Using directives
+csharp_using_directive_placement = outside_namespace:suggestion
+dotnet_sort_system_directives_first = true
+dotnet_separate_import_directive_groups = false
+
+# this. qualification
+dotnet_style_qualification_for_field = false:suggestion
+dotnet_style_qualification_for_property = false:suggestion
+dotnet_style_qualification_for_method = false:suggestion
+dotnet_style_qualification_for_event = false:suggestion
+
+# Language keywords vs BCL types
+dotnet_style_predefined_type_for_locals_parameters_members = true:suggestion
+dotnet_style_predefined_type_for_member_access = true:suggestion
+
+# var preferences
+csharp_style_var_for_built_in_types = false:suggestion
+csharp_style_var_when_type_is_apparent = true:suggestion
+csharp_style_var_elsewhere = false:suggestion
+
+# Expression-bodied members
+csharp_style_expression_bodied_methods = false:silent
+csharp_style_expression_bodied_constructors = false:silent
+csharp_style_expression_bodied_properties = true:silent
+
+# Pattern matching
+csharp_style_pattern_matching_over_is_with_cast_check = true:suggestion
+csharp_style_pattern_matching_over_as_with_null_check = true:suggestion
+
+# Null checking
+csharp_style_throw_expression = true:suggestion
+csharp_style_conditional_delegate_call = true:suggestion
+
+# Modifier preferences
+dotnet_style_require_accessibility_modifiers = for_non_interface_members:suggestion
+csharp_preferred_modifier_order = public,private,protected,internal,static,extern,new,virtual,abstract,sealed,override,readonly,unsafe,volatile,async:suggestion
+
+# Code style
+dotnet_style_object_initializer = true:suggestion
+dotnet_style_collection_initializer = true:suggestion
+dotnet_style_coalesce_expression = true:suggestion
+dotnet_style_null_propagation = true:suggestion
+dotnet_style_explicit_tuple_names = true:suggestion
+
+[*.{csproj,props,targets}]
+indent_size = 2
+
+[*.{json,yml,yaml}]
+indent_size = 2
+
+[*.md]
+trim_trailing_whitespace = false
diff --git a/src/TailoredApps.Shared.DateTime/DateTimeProvider.cs b/src/TailoredApps.Shared.DateTime/DateTimeProvider.cs
index 3c57b98..9480c66 100644
--- a/src/TailoredApps.Shared.DateTime/DateTimeProvider.cs
+++ b/src/TailoredApps.Shared.DateTime/DateTimeProvider.cs
@@ -1,4 +1,4 @@
-namespace TailoredApps.Shared.DateTime
+namespace TailoredApps.Shared.DateTime
 {
     /// <summary>
     /// Simple implementation used for <see cref="IDateTimeProvider"/> 
@@ -35,4 +35,4 @@ public class DateTimeProvider : IDateTimeProvider
         /// </summary>
         public System.DateTime UtcToday => System.DateTime.UtcNow.Date;
     }
-}
\ No newline at end of file
+}
diff --git a/src/TailoredApps.Shared.DateTime/IDateTimeProvider.cs b/src/TailoredApps.Shared.DateTime/IDateTimeProvider.cs
index bde48d5..74a064d 100644
--- a/src/TailoredApps.Shared.DateTime/IDateTimeProvider.cs
+++ b/src/TailoredApps.Shared.DateTime/IDateTimeProvider.cs
@@ -1,4 +1,4 @@
-namespace TailoredApps.Shared.DateTime
+namespace TailoredApps.Shared.DateTime
 {
     /// <summary>
     /// Simple interface for mocking <see cref="System.DateTime"/> used for unit testing and configuration in mocks time used in tests.
@@ -30,4 +30,4 @@ public interface IDateTimeProvider
         /// </summary>
         System.DateTime UtcToday { get; }
     }
-}
\ No newline at end of file
+}
diff --git a/src/TailoredApps.Shared.Email.Models/MailMessage.cs b/src/TailoredApps.Shared.Email.Models/MailMessage.cs
index bd5ad6d..ad5478c 100644
--- a/src/TailoredApps.Shared.Email.Models/MailMessage.cs
+++ b/src/TailoredApps.Shared.Email.Models/MailMessage.cs
@@ -1,33 +1,33 @@
-using System;
-using System.Collections.Generic;
-
-namespace TailoredApps.Shared.Email.Models
-{
-    /// <summary>Model wiadomości e-mail.</summary>
-    public class MailMessage
-    {
-        /// <summary>Temat wiadomości.</summary>
-        public string Topic { get; set; }
-
-        /// <summary>Nadawca wiadomości.</summary>
-        public string Sender { get; set; }
-
-        /// <summary>Odbiorca wiadomości.</summary>
-        public string Recipent { get; set; }
-
-        /// <summary>Kopia CC wiadomości.</summary>
-        public string Copy { get; set; }
-
-        /// <summary>Treść wiadomości (plain text).</summary>
-        public string Body { get; set; }
-
-        /// <summary>Treść wiadomości (HTML).</summary>
-        public string HtmlBody { get; set; }
-
-        /// <summary>Załączniki: nazwa pliku → zawartość Base64.</summary>
-        public Dictionary<string, string> Attachements { get; set; }
-
-        /// <summary>Data wysłania wiadomości.</summary>
-        public DateTimeOffset Date { get; set; }
-    }
-}
+using System;
+using System.Collections.Generic;
+
+namespace TailoredApps.Shared.Email.Models
+{
+    /// <summary>Represents an e-mail message.</summary>
+    public class MailMessage
+    {
+        /// <summary>The subject of the message.</summary>
+        public string Topic { get; set; }
+
+        /// <summary>The sender of the message.</summary>
+        public string Sender { get; set; }
+
+        /// <summary>The recipient of the message.</summary>
+        public string Recipent { get; set; }
+
+        /// <summary>The CC (carbon copy) recipient of the message.</summary>
+        public string Copy { get; set; }
+
+        /// <summary>The plain-text body of the message.</summary>
+        public string Body { get; set; }
+
+        /// <summary>The HTML body of the message.</summary>
+        public string HtmlBody { get; set; }
+
+        /// <summary>Attachments as a dictionary mapping file name to Base64-encoded content.</summary>
+        public Dictionary<string, string> Attachements { get; set; }
+
+        /// <summary>The date and time the message was sent.</summary>
+        public DateTimeOffset Date { get; set; }
+    }
+}
diff --git a/src/TailoredApps.Shared.Email.Office365/AuthenticationConfig.cs b/src/TailoredApps.Shared.Email.Office365/AuthenticationConfig.cs
index d910aa4..7c96c59 100644
--- a/src/TailoredApps.Shared.Email.Office365/AuthenticationConfig.cs
+++ b/src/TailoredApps.Shared.Email.Office365/AuthenticationConfig.cs
@@ -1,8 +1,8 @@
-// Copyright (c) Microsoft Corporation. All rights reserved.
+// Copyright (c) Microsoft Corporation. All rights reserved.
 // Licensed under the MIT License.
-using Microsoft.Identity.Web;
 using System;
 using System.Globalization;
+using Microsoft.Identity.Web;
 
 namespace TailoredApps.Shared.Email.Office365
 {
@@ -12,12 +12,13 @@ namespace TailoredApps.Shared.Email.Office365
     /// </summary>
     public class AuthenticationConfig
     {
+        /// <summary>The configuration key used to bind this section from application settings.</summary>
         public static string ConfigurationKey => "Mail:Providers:Office365";
         /// <summary>
         /// instance of Azure AD, for example public Azure or a Sovereign cloud (Azure China, Germany, US government, etc ...)
         /// </summary>
         public string Instance { get; set; } = "https://login.microsoftonline.com/{0}";
-       
+
         /// <summary>
         /// Graph API endpoint, could be public Azure (default) or a Sovereign cloud (US government, etc ...)
         /// </summary>
@@ -35,13 +36,13 @@ public class AuthenticationConfig
         /// Guid used by the application to uniquely identify itself to Azure AD
         /// </summary>
         public string ClientId { get; set; }
-     
+
         /// <summary>
         /// MailBox
         /// </summary>
         public string MailBox { get; set; }
 
-        
+
 
         /// <summary>
         /// URL of the authority
@@ -74,7 +75,7 @@ public string Authority
         /// <remarks> 
         public CertificateDescription Certificate { get; set; }
 
-        
+
     }
 
 
diff --git a/src/TailoredApps.Shared.Email.Office365/Office365EmailProvider.cs b/src/TailoredApps.Shared.Email.Office365/Office365EmailProvider.cs
index fabafb3..07fb3c9 100644
--- a/src/TailoredApps.Shared.Email.Office365/Office365EmailProvider.cs
+++ b/src/TailoredApps.Shared.Email.Office365/Office365EmailProvider.cs
@@ -1,4 +1,10 @@
-using MailKit;
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Net.Mail;
+using System.Threading.Tasks;
+using MailKit;
 using MailKit.Net.Imap;
 using MailKit.Search;
 using MailKit.Security;
@@ -8,16 +14,14 @@
 using Microsoft.Identity.Client;
 using Microsoft.Identity.Web;
 using MimeKit;
-using System;
-using System.Collections.Generic;
-using System.IO;
-using System.Linq;
-using System.Net.Mail;
-using System.Threading.Tasks;
 using TailoredApps.Shared.Email.Models;
 
 namespace TailoredApps.Shared.Email.Office365
 {
+    /// <summary>
+    /// Email provider implementation for Office 365 using IMAP with OAuth2 (client-credentials flow).
+    /// Authenticates against Azure AD as a confidential client application.
+    /// </summary>
     public class Office365EmailProvider : IEmailProvider
     {
         private readonly IOptions<AuthenticationConfig> options;
@@ -26,6 +30,11 @@ public class Office365EmailProvider : IEmailProvider
 
             };
         private readonly IConfidentialClientApplication confidentialClientApplication;
+        /// <summary>
+        /// Initializes a new instance of <see cref="Office365EmailProvider"/> and builds
+        /// the confidential client application using either a client secret or a certificate.
+        /// </summary>
+        /// <param name="options">The Office 365 authentication configuration options.</param>
         public Office365EmailProvider(IOptions<AuthenticationConfig> options)
         {
             this.options = options;
@@ -85,6 +94,18 @@ private static bool IsAppUsingClientSecret(AuthenticationConfig config)
             else
                 throw new Exception("You must choose between using client secret or certificate. Please update appsettings.json file.");
         }
+        /// <summary>
+        /// Retrieves e-mail messages from the configured Office 365 mailbox using IMAP with OAuth2.
+        /// </summary>
+        /// <param name="folderName">
+        /// The name of the IMAP sub-folder to search in. Defaults to the inbox when empty.
+        /// </param>
+        /// <param name="sender">Optional filter: only messages whose From address contains this value are returned.</param>
+        /// <param name="recipent">Optional filter: only messages whose To address contains this value are returned.</param>
+        /// <param name="fromLast">
+        /// Optional time-span filter: only messages delivered within the last <paramref name="fromLast"/> are returned.
+        /// </param>
+        /// <returns>A collection of <see cref="Models.MailMessage"/> objects matching the specified criteria.</returns>
         public async Task<ICollection<Models.MailMessage>> GetMail(string folderName = "", string sender = "", string recipent = "", TimeSpan? fromLast = null)
         {
             var response = new List<Models.MailMessage>();
@@ -163,13 +184,24 @@ private Dictionary<string, string> GetAttachements(IEnumerable<MimeEntity> attac
             return result;
         }
 
+        /// <summary>Sends an e-mail message via Office 365.</summary>
+        /// <param name="recipnet">The recipient e-mail address.</param>
+        /// <param name="topic">The subject of the message.</param>
+        /// <param name="messageBody">The body content of the message.</param>
+        /// <param name="attachments">A dictionary of attachment file names mapped to their byte content.</param>
+        /// <returns>A string result or identifier for the sent message.</returns>
         public async Task<string> SendMail(string recipnet, string topic, string messageBody, Dictionary<string, byte[]> attachments)
         {
             throw new NotImplementedException();
         }
     }
+    /// <summary>Extension methods for registering the Office 365 email provider with the DI container.</summary>
     public static class Office365EmailProviderExtensions
     {
+        /// <summary>
+        /// Registers <see cref="Office365EmailProvider"/> and its configuration options with the service collection.
+        /// </summary>
+        /// <param name="services">The <see cref="IServiceCollection"/> to add the services to.</param>
         public static void RegisterOffice365Provider(this IServiceCollection services)
         {
             services.AddOptions<AuthenticationConfig>();
@@ -178,14 +210,24 @@ public static void RegisterOffice365Provider(this IServiceCollection services)
         }
     }
 
+    /// <summary>
+    /// Configures <see cref="AuthenticationConfig"/> options by binding values from the application configuration.
+    /// </summary>
     public class Office365EmailConfigureOptions : IConfigureOptions<AuthenticationConfig>
     {
         private readonly IConfiguration configuration;
+
+        /// <summary>
+        /// Initializes a new instance of <see cref="Office365EmailConfigureOptions"/>.
+        /// </summary>
+        /// <param name="configuration">The application configuration used to read Office 365 settings.</param>
         public Office365EmailConfigureOptions(IConfiguration configuration)
         {
             this.configuration = configuration;
         }
 
+        /// <summary>Populates <paramref name="options"/> with values from the application configuration section.</summary>
+        /// <param name="options">The <see cref="AuthenticationConfig"/> instance to configure.</param>
         public void Configure(AuthenticationConfig options)
         {
             var section = configuration.GetSection(AuthenticationConfig.ConfigurationKey).Get<AuthenticationConfig>();
diff --git a/src/TailoredApps.Shared.Email/EmailServiceToConsolleWritter.cs b/src/TailoredApps.Shared.Email/EmailServiceToConsolleWritter.cs
index 624ce18..05ea21c 100644
--- a/src/TailoredApps.Shared.Email/EmailServiceToConsolleWritter.cs
+++ b/src/TailoredApps.Shared.Email/EmailServiceToConsolleWritter.cs
@@ -1,25 +1,47 @@
-using System;
-using System.Collections.Generic;
-using System.Threading.Tasks;
-using TailoredApps.Shared.Email.Models;
-
-namespace TailoredApps.Shared.Email
-{
-    /// <summary>Implementacja <see cref="IEmailProvider"/> wypisująca wiadomości na konsolę (dev/test).</summary>
-    public class EmailServiceToConsolleWritter : IEmailProvider
-    {
-        /// <inheritdoc/>
-        public async Task<ICollection<MailMessage>> GetMail(string folder = "", string sender = "", string recipent = "", TimeSpan? fromLast = null)
-        {
-            return new List<MailMessage>();
-        }
-
-        /// <inheritdoc/>
-        public async Task<string> SendMail(string recipnet, string topic, string messageBody, Dictionary<string, byte[]> attachments)
-        {
-            var message = $"recipent: {recipnet}; topic: {topic}; message: {messageBody}";
-            Console.WriteLine(message);
-            return message;
-        }
-    }
-}
+using System;
+using System.Collections.Generic;
+using System.Threading.Tasks;
+using TailoredApps.Shared.Email.Models;
+
+namespace TailoredApps.Shared.Email
+{
+    /// <summary>
+    /// Implementation of <see cref="IEmailProvider"/> that writes email messages to the console output.
+    /// Intended for development and testing scenarios where actual email delivery is not required.
+    /// </summary>
+    public class EmailServiceToConsolleWritter : IEmailProvider
+    {
+        /// <summary>
+        /// Returns an empty collection of mail messages.
+        /// This provider does not support retrieving messages and always returns an empty list.
+        /// </summary>
+        /// <param name="folder">The mailbox folder to retrieve messages from (ignored).</param>
+        /// <param name="sender">Filter by sender email address (ignored).</param>
+        /// <param name="recipent">Filter by recipient email address (ignored).</param>
+        /// <param name="fromLast">Time span to filter messages received within that period (ignored).</param>
+        /// <returns>A task that resolves to an empty collection of <see cref="MailMessage"/>.</returns>
+        public async Task<ICollection<MailMessage>> GetMail(string folder = "", string sender = "", string recipent = "", TimeSpan? fromLast = null)
+        {
+            return new List<MailMessage>();
+        }
+
+        /// <summary>
+        /// Writes the email details to the standard console output and returns the formatted message string.
+        /// No actual email is sent; this method is intended for local development and debugging.
+        /// </summary>
+        /// <param name="recipnet">The recipient email address.</param>
+        /// <param name="topic">The subject line of the email.</param>
+        /// <param name="messageBody">The body content of the email.</param>
+        /// <param name="attachments">A dictionary of attachment file names mapped to their byte content (not used by this provider).</param>
+        /// <returns>
+        /// A task that resolves to a formatted string containing the recipient address, topic, and message body
+        /// that was written to the console.
+        /// </returns>
+        public async Task<string> SendMail(string recipnet, string topic, string messageBody, Dictionary<string, byte[]> attachments)
+        {
+            var message = $"recipent: {recipnet}; topic: {topic}; message: {messageBody}";
+            Console.WriteLine(message);
+            return message;
+        }
+    }
+}
diff --git a/src/TailoredApps.Shared.Email/IEmailProvider.cs b/src/TailoredApps.Shared.Email/IEmailProvider.cs
index 22b5931..6f8cbea 100644
--- a/src/TailoredApps.Shared.Email/IEmailProvider.cs
+++ b/src/TailoredApps.Shared.Email/IEmailProvider.cs
@@ -1,17 +1,17 @@
-using System;
-using System.Collections.Generic;
-using System.Net.Mail;
-using System.Threading.Tasks;
-
-namespace TailoredApps.Shared.Email
-{
-    /// <summary>Interfejs dostawcy e-mail — wysyłanie i odbieranie wiadomości.</summary>
-    public interface IEmailProvider
-    {
-        /// <summary>Wywołanie API.</summary>
-        Task<string> SendMail(string recipnet, string topic, string messageBody, Dictionary<string, byte[]> attachments);
-        /// <summary>Wywołanie API.</summary>
-        Task<ICollection<Models.MailMessage>> GetMail(string folder = "", string sender = "", string recipent = "", TimeSpan? fromLast = null);
-
-    }
-}
+using System;
+using System.Collections.Generic;
+using System.Net.Mail;
+using System.Threading.Tasks;
+
+namespace TailoredApps.Shared.Email
+{
+    /// <summary>Interfejs dostawcy e-mail — wysyłanie i odbieranie wiadomości.</summary>
+    public interface IEmailProvider
+    {
+        /// <summary>Wywołanie API.</summary>
+        Task<string> SendMail(string recipnet, string topic, string messageBody, Dictionary<string, byte[]> attachments);
+        /// <summary>Wywołanie API.</summary>
+        Task<ICollection<Models.MailMessage>> GetMail(string folder = "", string sender = "", string recipent = "", TimeSpan? fromLast = null);
+
+    }
+}
diff --git a/src/TailoredApps.Shared.Email/MailMessageBuilder/DefaultMessageBuilder.cs b/src/TailoredApps.Shared.Email/MailMessageBuilder/DefaultMessageBuilder.cs
index bb333b2..b2c949f 100644
--- a/src/TailoredApps.Shared.Email/MailMessageBuilder/DefaultMessageBuilder.cs
+++ b/src/TailoredApps.Shared.Email/MailMessageBuilder/DefaultMessageBuilder.cs
@@ -1,23 +1,43 @@
-using System.Collections.Generic;
-
-namespace TailoredApps.Shared.Email.MailMessageBuilder
-{
-    /// <summary>Domyślna implementacja <see cref="IMailMessageBuilder"/> — zastępuje tokeny w szablonie.</summary>
-    public class DefaultMessageBuilder : IMailMessageBuilder
-    {
-        /// <inheritdoc/>
-        public string Build(string templateKey, IDictionary<string, string> variables, IDictionary<string, string> templates)
-        {
-            if (templates.ContainsKey(templateKey))
-            {
-                var templateTransform = templates[templateKey];
-                foreach (var token in variables)
-                {
-                    templateTransform = templateTransform.Replace(token.Key, token.Value);
-                }
-                return templateTransform;
-            }
-            throw new KeyNotFoundException("templateKey");
-        }
-    }
-}
+using System.Collections.Generic;
+
+namespace TailoredApps.Shared.Email.MailMessageBuilder
+{
+    /// <summary>
+    /// Default implementation of <see cref="IMailMessageBuilder"/> that builds a message by performing
+    /// simple key-value token replacement within a named template.
+    /// </summary>
+    public class DefaultMessageBuilder : IMailMessageBuilder
+    {
+        /// <summary>
+        /// Builds an email message body by locating the specified template and replacing each variable
+        /// token with its corresponding value.
+        /// </summary>
+        /// <param name="templateKey">
+        /// The key that identifies the template to use within the <paramref name="templates"/> dictionary.
+        /// </param>
+        /// <param name="variables">
+        /// A dictionary whose keys are the token strings to be replaced and whose values are the
+        /// replacement text to substitute into the template.
+        /// </param>
+        /// <param name="templates">
+        /// A dictionary mapping template keys to their raw template content strings.
+        /// </param>
+        /// <returns>The template content with all variable tokens replaced by their corresponding values.</returns>
+        /// <exception cref="System.Collections.Generic.KeyNotFoundException">
+        /// Thrown when <paramref name="templateKey"/> is not found in the <paramref name="templates"/> dictionary.
+        /// </exception>
+        public string Build(string templateKey, IDictionary<string, string> variables, IDictionary<string, string> templates)
+        {
+            if (templates.ContainsKey(templateKey))
+            {
+                var templateTransform = templates[templateKey];
+                foreach (var token in variables)
+                {
+                    templateTransform = templateTransform.Replace(token.Key, token.Value);
+                }
+                return templateTransform;
+            }
+            throw new KeyNotFoundException("templateKey");
+        }
+    }
+}
diff --git a/src/TailoredApps.Shared.Email/MailMessageBuilder/IMailMessageBuilder.cs b/src/TailoredApps.Shared.Email/MailMessageBuilder/IMailMessageBuilder.cs
index 405ac97..71e7cd8 100644
--- a/src/TailoredApps.Shared.Email/MailMessageBuilder/IMailMessageBuilder.cs
+++ b/src/TailoredApps.Shared.Email/MailMessageBuilder/IMailMessageBuilder.cs
@@ -1,11 +1,11 @@
-using System.Collections.Generic;
-
-namespace TailoredApps.Shared.Email.MailMessageBuilder
-{
-    /// <summary>Interfejs budowania treści wiadomości e-mail z szablonu.</summary>
-    public interface IMailMessageBuilder
-    {
-        /// <summary>Buduje treść wiadomości na podstawie klucza szablonu i zmiennych.</summary>
-        string Build(string templateKey, IDictionary<string, string> variables, IDictionary<string, string> templates);
-    }
-}
+using System.Collections.Generic;
+
+namespace TailoredApps.Shared.Email.MailMessageBuilder
+{
+    /// <summary>Interfejs budowania treści wiadomości e-mail z szablonu.</summary>
+    public interface IMailMessageBuilder
+    {
+        /// <summary>Buduje treść wiadomości na podstawie klucza szablonu i zmiennych.</summary>
+        string Build(string templateKey, IDictionary<string, string> variables, IDictionary<string, string> templates);
+    }
+}
diff --git a/src/TailoredApps.Shared.Email/MailMessageBuilder/TokenReplacingMailMessageBuilder.cs b/src/TailoredApps.Shared.Email/MailMessageBuilder/TokenReplacingMailMessageBuilder.cs
index 031fb17..10b17b4 100644
--- a/src/TailoredApps.Shared.Email/MailMessageBuilder/TokenReplacingMailMessageBuilder.cs
+++ b/src/TailoredApps.Shared.Email/MailMessageBuilder/TokenReplacingMailMessageBuilder.cs
@@ -1,53 +1,85 @@
-using Microsoft.Extensions.Options;
-using System.Collections.Generic;
-using System.IO;
-
-namespace TailoredApps.Shared.Email.MailMessageBuilder
-{
-    /// <summary>Buduje wiadomości e-mail z szablonów z podmianą tokenów.</summary>
-    public class TokenReplacingMailMessageBuilder : IMailMessageBuilder
-    {
-        private readonly IOptions<TokenReplacingMailMessageBuilderOptions> options;
-
-        /// <summary>Inicjalizuje instancję <see cref="TokenReplacingMailMessageBuilder"/>.</summary>
-        public TokenReplacingMailMessageBuilder(IOptions<TokenReplacingMailMessageBuilderOptions> options)
-        {
-            this.options = options;
-        }
-
-        /// <inheritdoc/>
-        public string Build(string templateKey, IDictionary<string, string> variables, IDictionary<string, string> templates)
-        {
-            if (templates == null)
-            {
-                templates = new Dictionary<string, string>();
-            }
-
-            if (options != null && options.Value != null && !string.IsNullOrEmpty(options.Value.Location))
-            {
-                var files = new DirectoryInfo(options.Value.Location).GetFiles($"*.{options.Value.FileExtension}", SearchOption.AllDirectories);
-                foreach (var file in files)
-                {
-                    if (!templates.ContainsKey(file.Name))
-                    {
-                        var template = file.OpenText().ReadToEnd();
-                        templates.Add(templateKey, template);
-                    }
-                }
-            }
-
-            if (templates.ContainsKey(templateKey))
-            {
-                var template = templates[templateKey];
-                foreach (var key in variables.Keys)
-                {
-                    template = template.Replace(@"{{" + key + "}}", variables[key]);
-                }
-                return template;
-            }
-
-            throw new KeyNotFoundException("templateKey");
-        }
-
-    }
-}
+using System.Collections.Generic;
+using System.IO;
+using Microsoft.Extensions.Options;
+
+namespace TailoredApps.Shared.Email.MailMessageBuilder
+{
+    /// <summary>
+    /// Implementation of <see cref="IMailMessageBuilder"/> that builds email message bodies
+    /// by loading templates from the file system and replacing <c>{{token}}</c> placeholders
+    /// with the provided variable values.
+    /// </summary>
+    public class TokenReplacingMailMessageBuilder : IMailMessageBuilder
+    {
+        private readonly IOptions<TokenReplacingMailMessageBuilderOptions> options;
+
+        /// <summary>
+        /// Initializes a new instance of <see cref="TokenReplacingMailMessageBuilder"/> with the specified options.
+        /// </summary>
+        /// <param name="options">
+        /// The options that specify the file system location and extension of template files,
+        /// wrapped in an <see cref="IOptions{TOptions}"/> accessor.
+        /// </param>
+        public TokenReplacingMailMessageBuilder(IOptions<TokenReplacingMailMessageBuilderOptions> options)
+        {
+            this.options = options;
+        }
+
+        /// <summary>
+        /// Builds an email message body by resolving the named template and replacing all
+        /// <c>{{variableName}}</c> placeholders with their corresponding values.
+        /// If a file-system location is configured in the options, template files are loaded
+        /// from disk and merged into the provided <paramref name="templates"/> dictionary
+        /// before the lookup is performed.
+        /// </summary>
+        /// <param name="templateKey">
+        /// The key that identifies the template to use. When templates are loaded from the file system
+        /// the key must match the file name (including extension).
+        /// </param>
+        /// <param name="variables">
+        /// A dictionary whose keys are the token names (without <c>{{}}</c> delimiters) and whose values
+        /// are the replacement strings to substitute into the template.
+        /// </param>
+        /// <param name="templates">
+        /// An optional dictionary of pre-loaded templates mapping template keys to their raw content.
+        /// A <c>null</c> value is treated as an empty dictionary.
+        /// </param>
+        /// <returns>The resolved template content with all <c>{{token}}</c> placeholders replaced.</returns>
+        /// <exception cref="System.Collections.Generic.KeyNotFoundException">
+        /// Thrown when <paramref name="templateKey"/> cannot be found in the resolved templates dictionary.
+        /// </exception>
+        public string Build(string templateKey, IDictionary<string, string> variables, IDictionary<string, string> templates)
+        {
+            if (templates == null)
+            {
+                templates = new Dictionary<string, string>();
+            }
+
+            if (options != null && options.Value != null && !string.IsNullOrEmpty(options.Value.Location))
+            {
+                var files = new DirectoryInfo(options.Value.Location).GetFiles($"*.{options.Value.FileExtension}", SearchOption.AllDirectories);
+                foreach (var file in files)
+                {
+                    if (!templates.ContainsKey(file.Name))
+                    {
+                        var template = file.OpenText().ReadToEnd();
+                        templates.Add(templateKey, template);
+                    }
+                }
+            }
+
+            if (templates.ContainsKey(templateKey))
+            {
+                var template = templates[templateKey];
+                foreach (var key in variables.Keys)
+                {
+                    template = template.Replace(@"{{" + key + "}}", variables[key]);
+                }
+                return template;
+            }
+
+            throw new KeyNotFoundException("templateKey");
+        }
+
+    }
+}
diff --git a/src/TailoredApps.Shared.Email/MailMessageBuilder/TokenReplacingMailMessageBuilderOptions.cs b/src/TailoredApps.Shared.Email/MailMessageBuilder/TokenReplacingMailMessageBuilderOptions.cs
index 7d383bd..cf71b23 100644
--- a/src/TailoredApps.Shared.Email/MailMessageBuilder/TokenReplacingMailMessageBuilderOptions.cs
+++ b/src/TailoredApps.Shared.Email/MailMessageBuilder/TokenReplacingMailMessageBuilderOptions.cs
@@ -1,11 +1,21 @@
-namespace TailoredApps.Shared.Email.MailMessageBuilder
-{
-    /// <summary>Opcje <see cref="TokenReplacingMailMessageBuilder"/> — lokalizacja i rozszerzenie szablonów.</summary>
-    public class TokenReplacingMailMessageBuilderOptions
-    {
-        /// <summary>Location.</summary>
-        public string Location { get; set; }
-        /// <summary>FileExtension.</summary>
-        public string FileExtension { get; set; }
-    }
-}
+namespace TailoredApps.Shared.Email.MailMessageBuilder
+{
+    /// <summary>
+    /// Configuration options for <see cref="TokenReplacingMailMessageBuilder"/>.
+    /// Specifies where template files are stored on the file system and which file extension they use.
+    /// </summary>
+    public class TokenReplacingMailMessageBuilderOptions
+    {
+        /// <summary>
+        /// Gets or sets the absolute or relative path to the directory that contains email template files.
+        /// When this value is set, the builder will load template files from this location at build time.
+        /// </summary>
+        public string Location { get; set; }
+
+        /// <summary>
+        /// Gets or sets the file extension (without the leading dot) used to filter template files
+        /// within the <see cref="Location"/> directory (e.g., <c>"html"</c> or <c>"txt"</c>).
+        /// </summary>
+        public string FileExtension { get; set; }
+    }
+}
diff --git a/src/TailoredApps.Shared.Email/SmtpEmailProvider.cs b/src/TailoredApps.Shared.Email/SmtpEmailProvider.cs
index 0b1a87e..98ea8aa 100644
--- a/src/TailoredApps.Shared.Email/SmtpEmailProvider.cs
+++ b/src/TailoredApps.Shared.Email/SmtpEmailProvider.cs
@@ -1,119 +1,167 @@
-using Microsoft.Extensions.Configuration;
-using Microsoft.Extensions.DependencyInjection;
-using Microsoft.Extensions.Options;
-using System;
-using System.Collections.Generic;
-using System.IO;
-using System.Net;
-using System.Net.Mail;
-using System.Threading.Tasks;
-
-namespace TailoredApps.Shared.Email
-{
-    /// <summary>Implementacja <see cref="IEmailProvider"/> wysyłająca e-maile przez SMTP.</summary>
-    public class SmtpEmailProvider : IEmailProvider
-    {
-        private readonly IOptions<SmtpEmailServiceOptions> options;
-        /// <summary>Inicjalizuje instancję providera.</summary>
-        public SmtpEmailProvider(IOptions<SmtpEmailServiceOptions> options)
-        {
-            this.options = options;
-        }
-
-        /// <inheritdoc/>
-        public async Task<ICollection<Models.MailMessage>> GetMail(string folder = "", string sender = "", string recipent = "", TimeSpan? fromLast = null)
-        {
-            throw new System.NotImplementedException();
-        }
-
-        /// <inheritdoc/>
-        public async Task<string> SendMail(string recipnet, string topic, string messageBody, Dictionary<string, byte[]> attachments)
-        {
-
-            using (var client = new SmtpClient(options.Value.Host, options.Value.Port))
-            {
-                client.UseDefaultCredentials = false;
-                client.Credentials = new NetworkCredential(options.Value.UserName, options.Value.Password);
-                client.EnableSsl = options.Value.EnableSsl;
-                client.Port = options.Value.Port;
-
-                var mailMessage = new MailMessage
-                {
-                    Sender = new MailAddress(options.Value.From),
-                    From = new MailAddress(options.Value.From),
-                    Subject = topic
-                };
-                if (attachments != null)
-                {
-                    foreach (var attachment in attachments)
-                    {
-                        mailMessage.Attachments.Add(new Attachment(new MemoryStream(attachment.Value), attachment.Key));
-                    }
-                }
-                if (options.Value.IsProd)
-                {
-                    mailMessage.To.Add(recipnet);
-                }
-                else
-                {
-                    mailMessage.To.Add(options.Value.CatchAll);
-                }
-
-                mailMessage.Body = messageBody;
-                mailMessage.IsBodyHtml = true;
-                mailMessage.BodyEncoding = System.Text.Encoding.UTF8;
-                var msgId = $"<{Guid.NewGuid().ToString().Replace(" - ", "")}@{mailMessage.Sender.Host}>";
-                mailMessage.Headers.Add(new System.Collections.Specialized.NameValueCollection() { { "Message-ID", msgId } });
-                await client.SendMailAsync(mailMessage);
-                return msgId;
-            }
-        }
-    }
-
-    /// <summary>Rozszerzenia DI dla dostawców e-mail SMTP i konsolowego.</summary>
-    public static class SmtpEmailProviderExtensions
-    {
-        /// <summary>Rejestruje provider i jego zależności w kontenerze DI.</summary>
-        public static void RegisterSmtpProvider(this IServiceCollection services)
-        {
-            services.AddOptions<SmtpEmailServiceOptions>();
-            services.ConfigureOptions<SmtpEmailConfigureOptions>();
-            services.AddTransient<IEmailProvider, SmtpEmailProvider>();
-        }
-        /// <summary>Rejestruje provider i jego zależności w kontenerze DI.</summary>
-        public static void RegisterConsoleProvider(this IServiceCollection services)
-        {
-            services.AddOptions<SmtpEmailServiceOptions>();
-            services.ConfigureOptions<SmtpEmailConfigureOptions>();
-            services.AddTransient<IEmailProvider, EmailServiceToConsolleWritter>();
-        }
-    }
-
-
-
-    /// <summary>Wczytuje opcje SMTP z konfiguracji aplikacji.</summary>
-    public class SmtpEmailConfigureOptions : IConfigureOptions<SmtpEmailServiceOptions>
-    {
-        private readonly IConfiguration configuration;
-        /// <summary>Inicjalizuje instancję konfiguracji.</summary>
-        public SmtpEmailConfigureOptions(IConfiguration configuration)
-        {
-            this.configuration = configuration;
-        }
-
-        /// <inheritdoc/>
-        public void Configure(SmtpEmailServiceOptions options)
-        {
-            var section = configuration.GetSection(SmtpEmailServiceOptions.ConfigurationKey).Get<SmtpEmailServiceOptions>();
-
-            options.Host = section.Host;
-            options.Port = section.Port;
-            options.Password = section.Password;
-            options.EnableSsl = section.EnableSsl;
-            options.UserName = section.UserName;
-            options.From = section.From;
-            options.IsProd = section.IsProd;
-            options.CatchAll = section.CatchAll;
-        }
-    }
-}
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Net;
+using System.Net.Mail;
+using System.Threading.Tasks;
+using Microsoft.Extensions.Configuration;
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Options;
+
+namespace TailoredApps.Shared.Email
+{
+    /// <summary>
+    /// Implementation of <see cref="IEmailProvider"/> that sends email messages via SMTP.
+    /// Uses <see cref="SmtpEmailServiceOptions"/> for server configuration.
+    /// </summary>
+    public class SmtpEmailProvider : IEmailProvider
+    {
+        private readonly IOptions<SmtpEmailServiceOptions> options;
+
+        /// <summary>
+        /// Initializes a new instance of <see cref="SmtpEmailProvider"/> with the specified SMTP options.
+        /// </summary>
+        /// <param name="options">The SMTP configuration options wrapped in an <see cref="IOptions{TOptions}"/> accessor.</param>
+        public SmtpEmailProvider(IOptions<SmtpEmailServiceOptions> options)
+        {
+            this.options = options;
+        }
+
+        /// <summary>
+        /// Retrieves email messages from the mail server. This method is not yet implemented.
+        /// </summary>
+        /// <param name="folder">The mailbox folder to retrieve messages from.</param>
+        /// <param name="sender">Filter by sender email address.</param>
+        /// <param name="recipent">Filter by recipient email address.</param>
+        /// <param name="fromLast">Time span to filter messages received within that period.</param>
+        /// <returns>A task that retrieves a collection of <see cref="Models.MailMessage"/> objects.</returns>
+        /// <exception cref="System.NotImplementedException">Always thrown; this method is not implemented.</exception>
+        public async Task<ICollection<Models.MailMessage>> GetMail(string folder = "", string sender = "", string recipent = "", TimeSpan? fromLast = null)
+        {
+            throw new System.NotImplementedException();
+        }
+
+        /// <summary>
+        /// Sends an email message via the configured SMTP server.
+        /// In non-production environments the message is redirected to the configured catch-all address.
+        /// </summary>
+        /// <param name="recipnet">The intended recipient email address.</param>
+        /// <param name="topic">The subject line of the email.</param>
+        /// <param name="messageBody">The HTML body content of the email.</param>
+        /// <param name="attachments">
+        /// An optional dictionary of attachment file names mapped to their byte content.
+        /// Pass <c>null</c> or an empty dictionary when no attachments are needed.
+        /// </param>
+        /// <returns>
+        /// A task that resolves to the RFC 2822 Message-ID header value assigned to the sent message.
+        /// </returns>
+        public async Task<string> SendMail(string recipnet, string topic, string messageBody, Dictionary<string, byte[]> attachments)
+        {
+
+            using (var client = new SmtpClient(options.Value.Host, options.Value.Port))
+            {
+                client.UseDefaultCredentials = false;
+                client.Credentials = new NetworkCredential(options.Value.UserName, options.Value.Password);
+                client.EnableSsl = options.Value.EnableSsl;
+                client.Port = options.Value.Port;
+
+                var mailMessage = new MailMessage
+                {
+                    Sender = new MailAddress(options.Value.From),
+                    From = new MailAddress(options.Value.From),
+                    Subject = topic
+                };
+                if (attachments != null)
+                {
+                    foreach (var attachment in attachments)
+                    {
+                        mailMessage.Attachments.Add(new Attachment(new MemoryStream(attachment.Value), attachment.Key));
+                    }
+                }
+                if (options.Value.IsProd)
+                {
+                    mailMessage.To.Add(recipnet);
+                }
+                else
+                {
+                    mailMessage.To.Add(options.Value.CatchAll);
+                }
+
+                mailMessage.Body = messageBody;
+                mailMessage.IsBodyHtml = true;
+                mailMessage.BodyEncoding = System.Text.Encoding.UTF8;
+                var msgId = $"<{Guid.NewGuid().ToString().Replace(" - ", "")}@{mailMessage.Sender.Host}>";
+                mailMessage.Headers.Add(new System.Collections.Specialized.NameValueCollection() { { "Message-ID", msgId } });
+                await client.SendMailAsync(mailMessage);
+                return msgId;
+            }
+        }
+    }
+
+    /// <summary>
+    /// Provides extension methods for registering email provider implementations in the dependency injection container.
+    /// </summary>
+    public static class SmtpEmailProviderExtensions
+    {
+        /// <summary>
+        /// Registers the <see cref="SmtpEmailProvider"/> and its required dependencies in the DI container.
+        /// Options are loaded from the application configuration using <see cref="SmtpEmailConfigureOptions"/>.
+        /// </summary>
+        /// <param name="services">The <see cref="IServiceCollection"/> to add the services to.</param>
+        public static void RegisterSmtpProvider(this IServiceCollection services)
+        {
+            services.AddOptions<SmtpEmailServiceOptions>();
+            services.ConfigureOptions<SmtpEmailConfigureOptions>();
+            services.AddTransient<IEmailProvider, SmtpEmailProvider>();
+        }
+
+        /// <summary>
+        /// Registers the <see cref="EmailServiceToConsolleWritter"/> console provider and its required dependencies in the DI container.
+        /// Options are loaded from the application configuration using <see cref="SmtpEmailConfigureOptions"/>.
+        /// </summary>
+        /// <param name="services">The <see cref="IServiceCollection"/> to add the services to.</param>
+        public static void RegisterConsoleProvider(this IServiceCollection services)
+        {
+            services.AddOptions<SmtpEmailServiceOptions>();
+            services.ConfigureOptions<SmtpEmailConfigureOptions>();
+            services.AddTransient<IEmailProvider, EmailServiceToConsolleWritter>();
+        }
+    }
+
+    /// <summary>
+    /// Configures <see cref="SmtpEmailServiceOptions"/> by reading values from the application configuration.
+    /// Implements <see cref="IConfigureOptions{TOptions}"/> to integrate with the options infrastructure.
+    /// </summary>
+    public class SmtpEmailConfigureOptions : IConfigureOptions<SmtpEmailServiceOptions>
+    {
+        private readonly IConfiguration configuration;
+
+        /// <summary>
+        /// Initializes a new instance of <see cref="SmtpEmailConfigureOptions"/> with the given application configuration.
+        /// </summary>
+        /// <param name="configuration">The application configuration used to read SMTP settings.</param>
+        public SmtpEmailConfigureOptions(IConfiguration configuration)
+        {
+            this.configuration = configuration;
+        }
+
+        /// <summary>
+        /// Populates the provided <see cref="SmtpEmailServiceOptions"/> instance with values
+        /// from the configuration section identified by <see cref="SmtpEmailServiceOptions.ConfigurationKey"/>.
+        /// </summary>
+        /// <param name="options">The options instance to configure.</param>
+        public void Configure(SmtpEmailServiceOptions options)
+        {
+            var section = configuration.GetSection(SmtpEmailServiceOptions.ConfigurationKey).Get<SmtpEmailServiceOptions>();
+
+            options.Host = section.Host;
+            options.Port = section.Port;
+            options.Password = section.Password;
+            options.EnableSsl = section.EnableSsl;
+            options.UserName = section.UserName;
+            options.From = section.From;
+            options.IsProd = section.IsProd;
+            options.CatchAll = section.CatchAll;
+        }
+    }
+}
diff --git a/src/TailoredApps.Shared.Email/SmtpEmailServiceOptions.cs b/src/TailoredApps.Shared.Email/SmtpEmailServiceOptions.cs
index fcced5b..adbc447 100644
--- a/src/TailoredApps.Shared.Email/SmtpEmailServiceOptions.cs
+++ b/src/TailoredApps.Shared.Email/SmtpEmailServiceOptions.cs
@@ -1,26 +1,57 @@
-namespace TailoredApps.Shared.Email
-{
-
-    /// <summary>Opcje konfiguracji dostawcy SMTP.</summary>
-    public class SmtpEmailServiceOptions
-    {
-        /// <summary>Klucz sekcji konfiguracji.</summary>
-        public static string ConfigurationKey => "Mail:Providers:Smtp";
-        /// <summary>Host.</summary>
-        public string Host { get; set; }
-        /// <summary>Port.</summary>
-        public int Port { get; set; }
-        /// <summary>Password.</summary>
-        public string Password { get; set; }
-        /// <summary>EnableSsl.</summary>
-        public bool EnableSsl { get; set; }
-        /// <summary>UserName.</summary>
-        public string UserName { get; set; }
-        /// <summary>From.</summary>
-        public string From { get; set; }
-        /// <summary>IsProd.</summary>
-        public bool IsProd { get; set; }
-        /// <summary>CatchAll.</summary>
-        public string CatchAll { get; set; }
-    }
-}
+namespace TailoredApps.Shared.Email
+{
+    /// <summary>
+    /// Configuration options for the SMTP email provider.
+    /// Bind this class to the configuration section identified by <see cref="ConfigurationKey"/>.
+    /// </summary>
+    public class SmtpEmailServiceOptions
+    {
+        /// <summary>
+        /// Gets the configuration section key used to bind these options from the application settings.
+        /// The value is <c>"Mail:Providers:Smtp"</c>.
+        /// </summary>
+        public static string ConfigurationKey => "Mail:Providers:Smtp";
+
+        /// <summary>
+        /// Gets or sets the hostname or IP address of the SMTP server.
+        /// </summary>
+        public string Host { get; set; }
+
+        /// <summary>
+        /// Gets or sets the port number used to connect to the SMTP server.
+        /// </summary>
+        public int Port { get; set; }
+
+        /// <summary>
+        /// Gets or sets the password used to authenticate with the SMTP server.
+        /// </summary>
+        public string Password { get; set; }
+
+        /// <summary>
+        /// Gets or sets a value indicating whether SSL/TLS encryption is enabled for the SMTP connection.
+        /// </summary>
+        public bool EnableSsl { get; set; }
+
+        /// <summary>
+        /// Gets or sets the username used to authenticate with the SMTP server.
+        /// </summary>
+        public string UserName { get; set; }
+
+        /// <summary>
+        /// Gets or sets the email address used as the sender (From/Sender header) of outgoing messages.
+        /// </summary>
+        public string From { get; set; }
+
+        /// <summary>
+        /// Gets or sets a value indicating whether the application is running in a production environment.
+        /// When <c>true</c>, emails are sent to the actual recipient; otherwise they are redirected to <see cref="CatchAll"/>.
+        /// </summary>
+        public bool IsProd { get; set; }
+
+        /// <summary>
+        /// Gets or sets the catch-all email address used as the recipient in non-production environments.
+        /// All outgoing messages are redirected to this address when <see cref="IsProd"/> is <c>false</c>.
+        /// </summary>
+        public string CatchAll { get; set; }
+    }
+}
diff --git a/src/TailoredApps.Shared.EntityFramework.UnitOfWork.WebApiCore/Attributes/TransactionIsolationLevelAttribute.cs b/src/TailoredApps.Shared.EntityFramework.UnitOfWork.WebApiCore/Attributes/TransactionIsolationLevelAttribute.cs
index ad54263..f4e7a83 100644
--- a/src/TailoredApps.Shared.EntityFramework.UnitOfWork.WebApiCore/Attributes/TransactionIsolationLevelAttribute.cs
+++ b/src/TailoredApps.Shared.EntityFramework.UnitOfWork.WebApiCore/Attributes/TransactionIsolationLevelAttribute.cs
@@ -1,16 +1,25 @@
-using System;
+using System;
 using System.Data;
 
 namespace TailoredApps.Shared.EntityFramework.UnitOfWork.WebApiCore.Attributes
 {
+    /// <summary>
+    /// Decorates a controller action (or entire controller class) to specify
+    /// the database transaction isolation level that the Unit of Work should apply.
+    /// </summary>
     [AttributeUsage(AttributeTargets.Class | AttributeTargets.Method, AllowMultiple = false, Inherited = true)]
     public class TransactionIsolationLevelAttribute : Attribute
     {
+        /// <summary>The isolation level to apply to the database transaction for the decorated action.</summary>
         public IsolationLevel Level { get; set; }
 
+        /// <summary>
+        /// Initialises the attribute with the specified isolation level.
+        /// </summary>
+        /// <param name="level">The <see cref="IsolationLevel"/> to use for the transaction.</param>
         public TransactionIsolationLevelAttribute(IsolationLevel level)
         {
             Level = level;
         }
     }
-}
\ No newline at end of file
+}
diff --git a/src/TailoredApps.Shared.EntityFramework.UnitOfWork.WebApiCore/Filters/TransactionFilterAttribute.cs b/src/TailoredApps.Shared.EntityFramework.UnitOfWork.WebApiCore/Filters/TransactionFilterAttribute.cs
index 82e4d41..8a55848 100644
--- a/src/TailoredApps.Shared.EntityFramework.UnitOfWork.WebApiCore/Filters/TransactionFilterAttribute.cs
+++ b/src/TailoredApps.Shared.EntityFramework.UnitOfWork.WebApiCore/Filters/TransactionFilterAttribute.cs
@@ -1,21 +1,36 @@
-using Microsoft.AspNetCore.Mvc.Controllers;
-using Microsoft.AspNetCore.Mvc.Filters;
 using System;
 using System.Reflection;
+using Microsoft.AspNetCore.Mvc.Controllers;
+using Microsoft.AspNetCore.Mvc.Filters;
 using TailoredApps.Shared.EntityFramework.Interfaces.UnitOfWork;
 using TailoredApps.Shared.EntityFramework.UnitOfWork.WebApiCore.Attributes;
 
 namespace TailoredApps.Shared.EntityFramework.UnitOfWork.WebApiCore.Filters
 {
+    /// <summary>
+    /// ASP.NET Core action filter that automatically wraps each controller action
+    /// in a Unit of Work transaction.
+    /// Commits on success and rolls back on exception.
+    /// The isolation level can be overridden per-action via <see cref="TransactionIsolationLevelAttribute"/>.
+    /// </summary>
     public class TransactionFilterAttribute : ActionFilterAttribute
     {
         private readonly IUnitOfWork _uow;
 
+        /// <summary>
+        /// Initialises the filter with the Unit of Work instance resolved from the DI container.
+        /// </summary>
+        /// <param name="uow">The scoped Unit of Work for the current HTTP request.</param>
         public TransactionFilterAttribute(IUnitOfWork uow)
         {
             _uow = uow;
         }
 
+        /// <summary>
+        /// Called before the action executes.
+        /// Applies a custom isolation level when the action is decorated with <see cref="TransactionIsolationLevelAttribute"/>.
+        /// </summary>
+        /// <param name="actionContext">The executing action context.</param>
         public override void OnActionExecuting(ActionExecutingContext actionContext)
         {
             //check if the action has explicitly stated which isolation level should be set in unit of work
@@ -31,10 +46,14 @@ public override void OnActionExecuting(ActionExecutingContext actionContext)
                 _uow.SetIsolationLevel(isolationLevelAttribute.Level);
             }
 
-
             base.OnActionExecuting(actionContext);
         }
 
+        /// <summary>
+        /// Called after the action executes.
+        /// Commits the transaction on success or rolls it back when an exception occurred.
+        /// </summary>
+        /// <param name="actionExecutedContext">The executed action context.</param>
         public override void OnActionExecuted(ActionExecutedContext actionExecutedContext)
         {
             // We need a container per request, therefore we cannot inject dependencies with StructureMap,
@@ -59,4 +78,4 @@ public override void OnActionExecuted(ActionExecutedContext actionExecutedContex
             base.OnActionExecuted(actionExecutedContext);
         }
     }
-}
\ No newline at end of file
+}
diff --git a/src/TailoredApps.Shared.EntityFramework.UnitOfWork.WebApiCore/UnitOfWorkConfiguration.cs b/src/TailoredApps.Shared.EntityFramework.UnitOfWork.WebApiCore/UnitOfWorkConfiguration.cs
index 113a948..7264f88 100644
--- a/src/TailoredApps.Shared.EntityFramework.UnitOfWork.WebApiCore/UnitOfWorkConfiguration.cs
+++ b/src/TailoredApps.Shared.EntityFramework.UnitOfWork.WebApiCore/UnitOfWorkConfiguration.cs
@@ -1,4 +1,4 @@
-using Microsoft.AspNetCore.Mvc.Filters;
+using Microsoft.AspNetCore.Mvc.Filters;
 using Microsoft.EntityFrameworkCore;
 using Microsoft.Extensions.DependencyInjection;
 using TailoredApps.Shared.EntityFramework.Interfaces.UnitOfWork;
@@ -6,8 +6,19 @@
 
 namespace TailoredApps.Shared.EntityFramework.UnitOfWork.WebApiCore
 {
+    /// <summary>
+    /// Extension methods for registering the Unit of Work pattern in ASP.NET Core Web API projects.
+    /// </summary>
     public static class UnitOfWorkConfiguration
     {
+        /// <summary>
+        /// Registers the Unit of Work and the <see cref="TransactionFilterAttribute"/> in the DI container,
+        /// scoped to the current HTTP request.
+        /// </summary>
+        /// <typeparam name="TTargetDbContextInterface">The interface that <typeparamref name="TTargetDbContext"/> must implement.</typeparam>
+        /// <typeparam name="TTargetDbContext">The concrete EF Core <see cref="DbContext"/> type.</typeparam>
+        /// <param name="services">The DI service collection to configure.</param>
+        /// <returns>An <see cref="IUnitOfWorkOptionsBuilder"/> for further configuration (hooks, auditing, etc.).</returns>
         public static IUnitOfWorkOptionsBuilder AddUnitOfWorkForWebApi<TTargetDbContextInterface, TTargetDbContext>(this IServiceCollection services)
             where TTargetDbContext : DbContext, TTargetDbContextInterface
             where TTargetDbContextInterface : class
@@ -16,9 +27,14 @@ public static IUnitOfWorkOptionsBuilder AddUnitOfWorkForWebApi<TTargetDbContextI
             return services.AddUnitOfWork<TTargetDbContextInterface, TTargetDbContext>();
         }
 
+        /// <summary>
+        /// Adds <see cref="TransactionFilterAttribute"/> as a global MVC filter so that every
+        /// controller action is automatically wrapped in a Unit of Work transaction.
+        /// </summary>
+        /// <param name="filters">The application's global filter collection.</param>
         public static void AddUnitOfWorkTransactionAttribute(this FilterCollection filters)
         {
             filters.Add<TransactionFilterAttribute>();
         }
     }
-}
\ No newline at end of file
+}
diff --git a/src/TailoredApps.Shared.EntityFramework/AssmeblyInfo.cs b/src/TailoredApps.Shared.EntityFramework/AssmeblyInfo.cs
index 52f412d..733bb5a 100644
--- a/src/TailoredApps.Shared.EntityFramework/AssmeblyInfo.cs
+++ b/src/TailoredApps.Shared.EntityFramework/AssmeblyInfo.cs
@@ -1,4 +1,4 @@
-using System.Runtime.CompilerServices;
+using System.Runtime.CompilerServices;
 
 [assembly: InternalsVisibleTo("TailoredApps.Shared.EntityFramework.Tests")]
-[assembly: InternalsVisibleTo("DynamicProxyGenAssembly2")]
\ No newline at end of file
+[assembly: InternalsVisibleTo("DynamicProxyGenAssembly2")]
diff --git a/src/TailoredApps.Shared.EntityFramework/Extensions/EntityTypeBuilderExtension.cs b/src/TailoredApps.Shared.EntityFramework/Extensions/EntityTypeBuilderExtension.cs
index 79ac446..cfd6e93 100644
--- a/src/TailoredApps.Shared.EntityFramework/Extensions/EntityTypeBuilderExtension.cs
+++ b/src/TailoredApps.Shared.EntityFramework/Extensions/EntityTypeBuilderExtension.cs
@@ -1,28 +1,28 @@
-using Microsoft.EntityFrameworkCore;
-using Microsoft.EntityFrameworkCore.Metadata.Builders;
-using System;
-using TailoredApps.Shared.EntityFramework.Interfaces;
-
-namespace TailoredApps.Shared.EntityFramework.Extensions
-{
-    /// <summary>
-    /// Provides extension methods for <see cref="EntityTypeBuilder{T}"/> to simplify
-    /// mapping of shared entity interfaces.
-    /// </summary>
-    public static class EntityTypeBuilderExtension
-    {
-        /// <summary>
-        /// Configures the standard activity-tracking columns (<c>CreatedBy</c>, <c>CreatedDateUtc</c>,
-        /// <c>ModifiedBy</c>, <c>ModifiedDateUtc</c>) for entities that implement <see cref="IActivity"/>.
-        /// </summary>
-        /// <typeparam name="T">The entity type that implements <see cref="IActivity"/>.</typeparam>
-        /// <param name="entity">The entity type builder to configure.</param>
-        public static void AddIActivity<T>(this EntityTypeBuilder<T> entity) where T : class, IActivity
-        {
-            entity.Property(t => t.CreatedBy).HasColumnName("CreatedBy").IsRequired().HasMaxLength(321);
-            entity.Property(t => t.CreatedDateUtc).HasColumnName("CreatedDateUtc").HasDefaultValue(DateTime.UtcNow).IsRequired();
-            entity.Property(t => t.ModifiedBy).HasColumnName("ModifiedBy").HasMaxLength(321);
-            entity.Property(t => t.ModifiedDateUtc).HasColumnName("ModifiedDateUtc");
-        }
-    }
-}
+using System;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Metadata.Builders;
+using TailoredApps.Shared.EntityFramework.Interfaces;
+
+namespace TailoredApps.Shared.EntityFramework.Extensions
+{
+    /// <summary>
+    /// Provides extension methods for <see cref="EntityTypeBuilder{T}"/> to simplify
+    /// mapping of shared entity interfaces.
+    /// </summary>
+    public static class EntityTypeBuilderExtension
+    {
+        /// <summary>
+        /// Configures the standard activity-tracking columns (<c>CreatedBy</c>, <c>CreatedDateUtc</c>,
+        /// <c>ModifiedBy</c>, <c>ModifiedDateUtc</c>) for entities that implement <see cref="IActivity"/>.
+        /// </summary>
+        /// <typeparam name="T">The entity type that implements <see cref="IActivity"/>.</typeparam>
+        /// <param name="entity">The entity type builder to configure.</param>
+        public static void AddIActivity<T>(this EntityTypeBuilder<T> entity) where T : class, IActivity
+        {
+            entity.Property(t => t.CreatedBy).HasColumnName("CreatedBy").IsRequired().HasMaxLength(321);
+            entity.Property(t => t.CreatedDateUtc).HasColumnName("CreatedDateUtc").HasDefaultValue(DateTime.UtcNow).IsRequired();
+            entity.Property(t => t.ModifiedBy).HasColumnName("ModifiedBy").HasMaxLength(321);
+            entity.Property(t => t.ModifiedDateUtc).HasColumnName("ModifiedDateUtc");
+        }
+    }
+}
diff --git a/src/TailoredApps.Shared.EntityFramework/Interfaces/Audit/AuditEntityState.cs b/src/TailoredApps.Shared.EntityFramework/Interfaces/Audit/AuditEntityState.cs
index e794dc1..e2b1840 100644
--- a/src/TailoredApps.Shared.EntityFramework/Interfaces/Audit/AuditEntityState.cs
+++ b/src/TailoredApps.Shared.EntityFramework/Interfaces/Audit/AuditEntityState.cs
@@ -1,24 +1,24 @@
-namespace TailoredApps.Shared.EntityFramework.Interfaces.Audit
-{
-    /// <summary>
-    /// Represents the audited state of an entity tracked by the Unit of Work audit context.
-    /// Mirrors the relevant values of <see cref="Microsoft.EntityFrameworkCore.EntityState"/>.
-    /// </summary>
-    public enum AuditEntityState
-    {
-        /// <summary>
-        /// Microsoft.EntityFrameworkCore.EntityState.Added
-        /// </summary>
-        Added,
-
-        /// <summary>
-        /// Microsoft.EntityFrameworkCore.EntityState.Modified
-        /// </summary>
-        Modified,
-
-        /// <summary>
-        /// Microsoft.EntityFrameworkCore.EntityState.Deleted
-        /// </summary>
-        Deleted,
-    }
-}
+namespace TailoredApps.Shared.EntityFramework.Interfaces.Audit
+{
+    /// <summary>
+    /// Represents the audited state of an entity tracked by the Unit of Work audit context.
+    /// Mirrors the relevant values of <see cref="Microsoft.EntityFrameworkCore.EntityState"/>.
+    /// </summary>
+    public enum AuditEntityState
+    {
+        /// <summary>
+        /// Microsoft.EntityFrameworkCore.EntityState.Added
+        /// </summary>
+        Added,
+
+        /// <summary>
+        /// Microsoft.EntityFrameworkCore.EntityState.Modified
+        /// </summary>
+        Modified,
+
+        /// <summary>
+        /// Microsoft.EntityFrameworkCore.EntityState.Deleted
+        /// </summary>
+        Deleted,
+    }
+}
diff --git a/src/TailoredApps.Shared.EntityFramework/Interfaces/Audit/EntityChange.cs b/src/TailoredApps.Shared.EntityFramework/Interfaces/Audit/EntityChange.cs
index c73d30b..53a31d1 100644
--- a/src/TailoredApps.Shared.EntityFramework/Interfaces/Audit/EntityChange.cs
+++ b/src/TailoredApps.Shared.EntityFramework/Interfaces/Audit/EntityChange.cs
@@ -1,85 +1,85 @@
-using System;
-using System.Collections.Generic;
-
-namespace TailoredApps.Shared.EntityFramework.Interfaces.Audit
-{
-    /// <summary>
-    /// Abstract base class representing a tracked change to an entity within the audit context.
-    /// Captures the entity type, its state, and the primary keys involved in the change.
-    /// </summary>
-    public abstract class EntityChange
-    {
-        /// <summary>
-        /// Initializes a new instance of <see cref="EntityChange"/> with the specified audit state.
-        /// </summary>
-        /// <param name="state">The <see cref="AuditEntityState"/> of the changed entity.</param>
-        protected EntityChange(AuditEntityState state)
-        {
-            State = state;
-        }
-
-        /// <summary>
-        /// Gets the CLR type of the changed entity.
-        /// </summary>
-        public Type EntityType { get; protected set; }
-
-        /// <summary>
-        /// Gets the audit state of the entity (Added, Modified, or Deleted).
-        /// </summary>
-        public AuditEntityState State { get; protected set; }
-
-        /// <summary>
-        /// Gets the original (pre-change) snapshot of the entity as an untyped object.
-        /// </summary>
-        public abstract object Original { get; }
-
-        /// <summary>
-        /// Gets the current (post-change) snapshot of the entity as an untyped object.
-        /// </summary>
-        public abstract object Current { get; }
-
-        /// <summary>
-        /// Gets or sets the dictionary of primary key names and their values for the changed entity.
-        /// </summary>
-        public Dictionary<string, object> PrimaryKeys { get; set; }
-    }
-
-    /// <summary>
-    /// Strongly-typed representation of a tracked entity change.
-    /// </summary>
-    /// <typeparam name="TEntity">The type of the audited entity.</typeparam>
-    public class EntityChange<TEntity> : EntityChange
-        where TEntity : class
-    {
-        /// <summary>
-        /// Initializes a new instance of <see cref="EntityChange{TEntity}"/>.
-        /// </summary>
-        /// <param name="currentEntity">The current (post-change) state of the entity.</param>
-        /// <param name="originalEntity">The original (pre-change) state of the entity.</param>
-        /// <param name="keys">The primary key values of the entity.</param>
-        /// <param name="state">The audit state describing the type of change.</param>
-        public EntityChange(TEntity currentEntity, TEntity originalEntity, Dictionary<string, object> keys, AuditEntityState state) : base(state)
-        {
-            CurrentEntity = currentEntity ?? throw new ArgumentNullException(nameof(currentEntity));
-            OriginalEntity = originalEntity ?? throw new ArgumentNullException(nameof(originalEntity));
-            EntityType = typeof(TEntity);
-            PrimaryKeys = keys;
-        }
-
-        /// <summary>
-        /// Gets the original (pre-change) state of the entity.
-        /// </summary>
-        public TEntity OriginalEntity { get; protected set; }
-
-        /// <inheritdoc/>
-        public override object Original { get => OriginalEntity; }
-
-        /// <summary>
-        /// Gets the current (post-change) state of the entity.
-        /// </summary>
-        public TEntity CurrentEntity { get; protected set; }
-
-        /// <inheritdoc/>
-        public override object Current { get => CurrentEntity; }
-    }
-}
+using System;
+using System.Collections.Generic;
+
+namespace TailoredApps.Shared.EntityFramework.Interfaces.Audit
+{
+    /// <summary>
+    /// Abstract base class representing a tracked change to an entity within the audit context.
+    /// Captures the entity type, its state, and the primary keys involved in the change.
+    /// </summary>
+    public abstract class EntityChange
+    {
+        /// <summary>
+        /// Initializes a new instance of <see cref="EntityChange"/> with the specified audit state.
+        /// </summary>
+        /// <param name="state">The <see cref="AuditEntityState"/> of the changed entity.</param>
+        protected EntityChange(AuditEntityState state)
+        {
+            State = state;
+        }
+
+        /// <summary>
+        /// Gets the CLR type of the changed entity.
+        /// </summary>
+        public Type EntityType { get; protected set; }
+
+        /// <summary>
+        /// Gets the audit state of the entity (Added, Modified, or Deleted).
+        /// </summary>
+        public AuditEntityState State { get; protected set; }
+
+        /// <summary>
+        /// Gets the original (pre-change) snapshot of the entity as an untyped object.
+        /// </summary>
+        public abstract object Original { get; }
+
+        /// <summary>
+        /// Gets the current (post-change) snapshot of the entity as an untyped object.
+        /// </summary>
+        public abstract object Current { get; }
+
+        /// <summary>
+        /// Gets or sets the dictionary of primary key names and their values for the changed entity.
+        /// </summary>
+        public Dictionary<string, object> PrimaryKeys { get; set; }
+    }
+
+    /// <summary>
+    /// Strongly-typed representation of a tracked entity change.
+    /// </summary>
+    /// <typeparam name="TEntity">The type of the audited entity.</typeparam>
+    public class EntityChange<TEntity> : EntityChange
+        where TEntity : class
+    {
+        /// <summary>
+        /// Initializes a new instance of <see cref="EntityChange{TEntity}"/>.
+        /// </summary>
+        /// <param name="currentEntity">The current (post-change) state of the entity.</param>
+        /// <param name="originalEntity">The original (pre-change) state of the entity.</param>
+        /// <param name="keys">The primary key values of the entity.</param>
+        /// <param name="state">The audit state describing the type of change.</param>
+        public EntityChange(TEntity currentEntity, TEntity originalEntity, Dictionary<string, object> keys, AuditEntityState state) : base(state)
+        {
+            CurrentEntity = currentEntity ?? throw new ArgumentNullException(nameof(currentEntity));
+            OriginalEntity = originalEntity ?? throw new ArgumentNullException(nameof(originalEntity));
+            EntityType = typeof(TEntity);
+            PrimaryKeys = keys;
+        }
+
+        /// <summary>
+        /// Gets the original (pre-change) state of the entity.
+        /// </summary>
+        public TEntity OriginalEntity { get; protected set; }
+
+        /// <inheritdoc/>
+        public override object Original { get => OriginalEntity; }
+
+        /// <summary>
+        /// Gets the current (post-change) state of the entity.
+        /// </summary>
+        public TEntity CurrentEntity { get; protected set; }
+
+        /// <inheritdoc/>
+        public override object Current { get => CurrentEntity; }
+    }
+}
diff --git a/src/TailoredApps.Shared.EntityFramework/Interfaces/Audit/IAuditSettings.cs b/src/TailoredApps.Shared.EntityFramework/Interfaces/Audit/IAuditSettings.cs
index 3e4ad6a..8857964 100644
--- a/src/TailoredApps.Shared.EntityFramework/Interfaces/Audit/IAuditSettings.cs
+++ b/src/TailoredApps.Shared.EntityFramework/Interfaces/Audit/IAuditSettings.cs
@@ -1,25 +1,25 @@
-using System;
-using System.Collections.Generic;
-
-namespace TailoredApps.Shared.EntityFramework.Interfaces.Audit
-{
-    /// <summary>
-    /// Defines the configuration settings that control which entity types and states
-    /// are collected by the Unit of Work audit mechanism.
-    /// </summary>
-    public interface IAuditSettings
-    {
-        /// <summary>
-        /// Gets or sets the collection of CLR types whose changes should be audited.
-        /// Only entities whose type is present in this collection will be tracked.
-        /// </summary>
-        IEnumerable<Type> TypesToCollect { get; set; }
-
-        /// <summary>
-        /// Gets or sets the collection of entity states (Added, Modified, Deleted) to include
-        /// in the audit. Only state transitions matching an entry in this collection are recorded.
-        /// </summary>
-        IEnumerable<AuditEntityState> EntityStatesToCollect { get; set; }
-    }
-
-}
+using System;
+using System.Collections.Generic;
+
+namespace TailoredApps.Shared.EntityFramework.Interfaces.Audit
+{
+    /// <summary>
+    /// Defines the configuration settings that control which entity types and states
+    /// are collected by the Unit of Work audit mechanism.
+    /// </summary>
+    public interface IAuditSettings
+    {
+        /// <summary>
+        /// Gets or sets the collection of CLR types whose changes should be audited.
+        /// Only entities whose type is present in this collection will be tracked.
+        /// </summary>
+        IEnumerable<Type> TypesToCollect { get; set; }
+
+        /// <summary>
+        /// Gets or sets the collection of entity states (Added, Modified, Deleted) to include
+        /// in the audit. Only state transitions matching an entry in this collection are recorded.
+        /// </summary>
+        IEnumerable<AuditEntityState> EntityStatesToCollect { get; set; }
+    }
+
+}
diff --git a/src/TailoredApps.Shared.EntityFramework/Interfaces/Audit/IEntityChangesAuditor.cs b/src/TailoredApps.Shared.EntityFramework/Interfaces/Audit/IEntityChangesAuditor.cs
index 31aa010..f6a9c4c 100644
--- a/src/TailoredApps.Shared.EntityFramework/Interfaces/Audit/IEntityChangesAuditor.cs
+++ b/src/TailoredApps.Shared.EntityFramework/Interfaces/Audit/IEntityChangesAuditor.cs
@@ -1,17 +1,17 @@
-using System.Collections.Generic;
-
-namespace TailoredApps.Shared.EntityFramework.Interfaces.Audit
-{
-    /// <summary>
-    /// Defines the contract for processing and persisting a collection of audited entity changes
-    /// after they have been collected by the Unit of Work audit context.
-    /// </summary>
-    public interface IEntityChangesAuditor
-    {
-        /// <summary>
-        /// Processes and stores the given entity changes (e.g. writes them to an audit log).
-        /// </summary>
-        /// <param name="entityChanges">The collection of entity changes to audit.</param>
-        void AuditChanges(IEnumerable<EntityChange> entityChanges);
-    }
-}
+using System.Collections.Generic;
+
+namespace TailoredApps.Shared.EntityFramework.Interfaces.Audit
+{
+    /// <summary>
+    /// Defines the contract for processing and persisting a collection of audited entity changes
+    /// after they have been collected by the Unit of Work audit context.
+    /// </summary>
+    public interface IEntityChangesAuditor
+    {
+        /// <summary>
+        /// Processes and stores the given entity changes (e.g. writes them to an audit log).
+        /// </summary>
+        /// <param name="entityChanges">The collection of entity changes to audit.</param>
+        void AuditChanges(IEnumerable<EntityChange> entityChanges);
+    }
+}
diff --git a/src/TailoredApps.Shared.EntityFramework/Interfaces/Audit/IUnitOfWorkAuditContext.cs b/src/TailoredApps.Shared.EntityFramework/Interfaces/Audit/IUnitOfWorkAuditContext.cs
index 216f1b9..8af66ad 100644
--- a/src/TailoredApps.Shared.EntityFramework/Interfaces/Audit/IUnitOfWorkAuditContext.cs
+++ b/src/TailoredApps.Shared.EntityFramework/Interfaces/Audit/IUnitOfWorkAuditContext.cs
@@ -1,32 +1,32 @@
-namespace TailoredApps.Shared.EntityFramework.Interfaces.Audit
-{
-    /// <summary>
-    /// Defines the lifecycle contract for the Unit of Work audit context.
-    /// Manages collection, post-processing, discarding, and final auditing of entity changes.
-    /// </summary>
-    public interface IUnitOfWorkAuditContext
-    {
-        /// <summary>
-        /// Performs any post-collection processing on the gathered entity changes
-        /// (e.g. enriching change records after save).
-        /// </summary>
-        void PostCollectChanges();
-
-        /// <summary>
-        /// Collects the current entity changes from the EF Core change tracker
-        /// before the save operation is committed.
-        /// </summary>
-        void CollectChanges();
-
-        /// <summary>
-        /// Discards all previously collected entity changes, typically called on transaction rollback.
-        /// </summary>
-        void DiscardChanges();
-
-        /// <summary>
-        /// Passes the collected entity changes to the registered <see cref="IEntityChangesAuditor"/>
-        /// for processing and persistence (e.g. after a successful transaction commit).
-        /// </summary>
-        void AuditChanges();
-    }
-}
+namespace TailoredApps.Shared.EntityFramework.Interfaces.Audit
+{
+    /// <summary>
+    /// Defines the lifecycle contract for the Unit of Work audit context.
+    /// Manages collection, post-processing, discarding, and final auditing of entity changes.
+    /// </summary>
+    public interface IUnitOfWorkAuditContext
+    {
+        /// <summary>
+        /// Performs any post-collection processing on the gathered entity changes
+        /// (e.g. enriching change records after save).
+        /// </summary>
+        void PostCollectChanges();
+
+        /// <summary>
+        /// Collects the current entity changes from the EF Core change tracker
+        /// before the save operation is committed.
+        /// </summary>
+        void CollectChanges();
+
+        /// <summary>
+        /// Discards all previously collected entity changes, typically called on transaction rollback.
+        /// </summary>
+        void DiscardChanges();
+
+        /// <summary>
+        /// Passes the collected entity changes to the registered <see cref="IEntityChangesAuditor"/>
+        /// for processing and persistence (e.g. after a successful transaction commit).
+        /// </summary>
+        void AuditChanges();
+    }
+}
diff --git a/src/TailoredApps.Shared.EntityFramework/Interfaces/IActivity.cs b/src/TailoredApps.Shared.EntityFramework/Interfaces/IActivity.cs
index 17fce9f..c08cf94 100644
--- a/src/TailoredApps.Shared.EntityFramework/Interfaces/IActivity.cs
+++ b/src/TailoredApps.Shared.EntityFramework/Interfaces/IActivity.cs
@@ -1,30 +1,30 @@
-using System;
-
-namespace TailoredApps.Shared.EntityFramework.Interfaces
-{
-    /// <summary>
-    /// Marks an entity as tracking activity metadata: who created or last modified it and when.
-    /// </summary>
-    public interface IActivity
-    {
-        /// <summary>
-        /// Gets or sets the UTC date and time when the entity was created.
-        /// </summary>
-        DateTime CreatedDateUtc { get; set; }
-
-        /// <summary>
-        /// Gets or sets the identifier (e.g. username or email) of the user who created the entity.
-        /// </summary>
-        string CreatedBy { get; set; }
-
-        /// <summary>
-        /// Gets or sets the UTC date and time when the entity was last modified, or <c>null</c> if it has never been modified.
-        /// </summary>
-        DateTime? ModifiedDateUtc { get; set; }
-
-        /// <summary>
-        /// Gets or sets the identifier of the user who last modified the entity, or <c>null</c> if it has never been modified.
-        /// </summary>
-        string ModifiedBy { get; set; }
-    }
-}
+using System;
+
+namespace TailoredApps.Shared.EntityFramework.Interfaces
+{
+    /// <summary>
+    /// Marks an entity as tracking activity metadata: who created or last modified it and when.
+    /// </summary>
+    public interface IActivity
+    {
+        /// <summary>
+        /// Gets or sets the UTC date and time when the entity was created.
+        /// </summary>
+        DateTime CreatedDateUtc { get; set; }
+
+        /// <summary>
+        /// Gets or sets the identifier (e.g. username or email) of the user who created the entity.
+        /// </summary>
+        string CreatedBy { get; set; }
+
+        /// <summary>
+        /// Gets or sets the UTC date and time when the entity was last modified, or <c>null</c> if it has never been modified.
+        /// </summary>
+        DateTime? ModifiedDateUtc { get; set; }
+
+        /// <summary>
+        /// Gets or sets the identifier of the user who last modified the entity, or <c>null</c> if it has never been modified.
+        /// </summary>
+        string ModifiedBy { get; set; }
+    }
+}
diff --git a/src/TailoredApps.Shared.EntityFramework/Interfaces/IModelBase.cs b/src/TailoredApps.Shared.EntityFramework/Interfaces/IModelBase.cs
index 56d7e21..7f61120 100644
--- a/src/TailoredApps.Shared.EntityFramework/Interfaces/IModelBase.cs
+++ b/src/TailoredApps.Shared.EntityFramework/Interfaces/IModelBase.cs
@@ -1,22 +1,22 @@
-namespace TailoredApps.Shared.EntityFramework.Interfaces
-{
-    /// <summary>
-    /// Strongly-typed base interface for entities that expose an identifier of type <typeparamref name="T"/>.
-    /// </summary>
-    /// <typeparam name="T">The type of the entity's primary key.</typeparam>
-    public interface IModelBase<T> : IModelBase
-    {
-        /// <summary>
-        /// Gets or sets the primary key of the entity.
-        /// </summary>
-        T Id { get; set; }
-    }
-
-    /// <summary>
-    /// Marker interface for all entity model base types in the EntityFramework shared layer.
-    /// Used as a constraint for generic query helpers.
-    /// </summary>
-    public interface IModelBase
-    {
-    }
-}
+namespace TailoredApps.Shared.EntityFramework.Interfaces
+{
+    /// <summary>
+    /// Strongly-typed base interface for entities that expose an identifier of type <typeparamref name="T"/>.
+    /// </summary>
+    /// <typeparam name="T">The type of the entity's primary key.</typeparam>
+    public interface IModelBase<T> : IModelBase
+    {
+        /// <summary>
+        /// Gets or sets the primary key of the entity.
+        /// </summary>
+        T Id { get; set; }
+    }
+
+    /// <summary>
+    /// Marker interface for all entity model base types in the EntityFramework shared layer.
+    /// Used as a constraint for generic query helpers.
+    /// </summary>
+    public interface IModelBase
+    {
+    }
+}
diff --git a/src/TailoredApps.Shared.EntityFramework/Interfaces/IModelBuilder.cs b/src/TailoredApps.Shared.EntityFramework/Interfaces/IModelBuilder.cs
index f6ce38e..b7e4d10 100644
--- a/src/TailoredApps.Shared.EntityFramework/Interfaces/IModelBuilder.cs
+++ b/src/TailoredApps.Shared.EntityFramework/Interfaces/IModelBuilder.cs
@@ -1,17 +1,17 @@
-using Microsoft.EntityFrameworkCore;
-
-namespace TailoredApps.Shared.EntityFramework.Interfaces
-{
-    /// <summary>
-    /// Defines the contract for a class that contributes EF Core model configuration
-    /// to a <see cref="ModelBuilder"/> during the <c>OnModelCreating</c> phase.
-    /// </summary>
-    public interface IModelBuilder
-    {
-        /// <summary>
-        /// Applies entity mappings, relationships, and constraints to the provided <paramref name="modelBuilder"/>.
-        /// </summary>
-        /// <param name="modelBuilder">The EF Core model builder to configure.</param>
-        void MapModel(ModelBuilder modelBuilder);
-    }
-}
+using Microsoft.EntityFrameworkCore;
+
+namespace TailoredApps.Shared.EntityFramework.Interfaces
+{
+    /// <summary>
+    /// Defines the contract for a class that contributes EF Core model configuration
+    /// to a <see cref="ModelBuilder"/> during the <c>OnModelCreating</c> phase.
+    /// </summary>
+    public interface IModelBuilder
+    {
+        /// <summary>
+        /// Applies entity mappings, relationships, and constraints to the provided <paramref name="modelBuilder"/>.
+        /// </summary>
+        /// <param name="modelBuilder">The EF Core model builder to configure.</param>
+        void MapModel(ModelBuilder modelBuilder);
+    }
+}
diff --git a/src/TailoredApps.Shared.EntityFramework/Interfaces/UnitOfWork/IHook.cs b/src/TailoredApps.Shared.EntityFramework/Interfaces/UnitOfWork/IHook.cs
index f1afd53..472e439 100644
--- a/src/TailoredApps.Shared.EntityFramework/Interfaces/UnitOfWork/IHook.cs
+++ b/src/TailoredApps.Shared.EntityFramework/Interfaces/UnitOfWork/IHook.cs
@@ -1,36 +1,36 @@
-
-
-namespace TailoredApps.Shared.EntityFramework.Interfaces.UnitOfWork
-{
-    /// <summary>
-    /// Base contract for Unit of Work lifecycle hooks.
-    /// Implementations are invoked at specific points in the save/transaction lifecycle.
-    /// </summary>
-    public interface IHook
-    {
-        /// <summary>
-        /// Executes the hook logic at the appropriate lifecycle point.
-        /// </summary>
-        void Execute();
-    }
-
-    /// <summary>
-    /// Hook that is executed immediately after a transaction is successfully committed.
-    /// </summary>
-    public interface ITransactionCommitHook : IHook { }
-
-    /// <summary>
-    /// Hook that is executed immediately after a transaction is rolled back.
-    /// </summary>
-    public interface ITransactionRollbackHook : IHook { }
-
-    /// <summary>
-    /// Hook that is executed immediately after <c>SaveChanges</c> completes successfully.
-    /// </summary>
-    public interface IPostSaveChangesHook : IHook { }
-
-    /// <summary>
-    /// Hook that is executed immediately before <c>SaveChanges</c> is called.
-    /// </summary>
-    public interface IPreSaveChangesHook : IHook { }
-}
+
+
+namespace TailoredApps.Shared.EntityFramework.Interfaces.UnitOfWork
+{
+    /// <summary>
+    /// Base contract for Unit of Work lifecycle hooks.
+    /// Implementations are invoked at specific points in the save/transaction lifecycle.
+    /// </summary>
+    public interface IHook
+    {
+        /// <summary>
+        /// Executes the hook logic at the appropriate lifecycle point.
+        /// </summary>
+        void Execute();
+    }
+
+    /// <summary>
+    /// Hook that is executed immediately after a transaction is successfully committed.
+    /// </summary>
+    public interface ITransactionCommitHook : IHook { }
+
+    /// <summary>
+    /// Hook that is executed immediately after a transaction is rolled back.
+    /// </summary>
+    public interface ITransactionRollbackHook : IHook { }
+
+    /// <summary>
+    /// Hook that is executed immediately after <c>SaveChanges</c> completes successfully.
+    /// </summary>
+    public interface IPostSaveChangesHook : IHook { }
+
+    /// <summary>
+    /// Hook that is executed immediately before <c>SaveChanges</c> is called.
+    /// </summary>
+    public interface IPreSaveChangesHook : IHook { }
+}
diff --git a/src/TailoredApps.Shared.EntityFramework/Interfaces/UnitOfWork/IHooksManager.cs b/src/TailoredApps.Shared.EntityFramework/Interfaces/UnitOfWork/IHooksManager.cs
index a35a22a..6e764be 100644
--- a/src/TailoredApps.Shared.EntityFramework/Interfaces/UnitOfWork/IHooksManager.cs
+++ b/src/TailoredApps.Shared.EntityFramework/Interfaces/UnitOfWork/IHooksManager.cs
@@ -1,33 +1,33 @@
-namespace TailoredApps.Shared.EntityFramework.Interfaces.UnitOfWork
-{
-    /// <summary>
-    /// Manages and executes the registered Unit of Work lifecycle hooks
-    /// at the appropriate points in the save/transaction cycle.
-    /// </summary>
-    public interface IHooksManager
-    {
-        /// <summary>
-        /// Executes all registered <see cref="IPreSaveChangesHook"/> implementations
-        /// before changes are saved to the database.
-        /// </summary>
-        void ExecutePreSaveChangesHooks();
-
-        /// <summary>
-        /// Executes all registered <see cref="IPostSaveChangesHook"/> implementations
-        /// after changes have been saved to the database.
-        /// </summary>
-        void ExecutePostSaveChangesHooks();
-
-        /// <summary>
-        /// Executes all registered <see cref="ITransactionRollbackHook"/> implementations
-        /// after a transaction has been rolled back.
-        /// </summary>
-        void ExecuteTransactionRollbackHooks();
-
-        /// <summary>
-        /// Executes all registered <see cref="ITransactionCommitHook"/> implementations
-        /// after a transaction has been committed.
-        /// </summary>
-        void ExecuteTransactionCommitHooks();
-    }
-}
+namespace TailoredApps.Shared.EntityFramework.Interfaces.UnitOfWork
+{
+    /// <summary>
+    /// Manages and executes the registered Unit of Work lifecycle hooks
+    /// at the appropriate points in the save/transaction cycle.
+    /// </summary>
+    public interface IHooksManager
+    {
+        /// <summary>
+        /// Executes all registered <see cref="IPreSaveChangesHook"/> implementations
+        /// before changes are saved to the database.
+        /// </summary>
+        void ExecutePreSaveChangesHooks();
+
+        /// <summary>
+        /// Executes all registered <see cref="IPostSaveChangesHook"/> implementations
+        /// after changes have been saved to the database.
+        /// </summary>
+        void ExecutePostSaveChangesHooks();
+
+        /// <summary>
+        /// Executes all registered <see cref="ITransactionRollbackHook"/> implementations
+        /// after a transaction has been rolled back.
+        /// </summary>
+        void ExecuteTransactionRollbackHooks();
+
+        /// <summary>
+        /// Executes all registered <see cref="ITransactionCommitHook"/> implementations
+        /// after a transaction has been committed.
+        /// </summary>
+        void ExecuteTransactionCommitHooks();
+    }
+}
diff --git a/src/TailoredApps.Shared.EntityFramework/Interfaces/UnitOfWork/ITransaction.cs b/src/TailoredApps.Shared.EntityFramework/Interfaces/UnitOfWork/ITransaction.cs
index 02ade3d..dafb277 100644
--- a/src/TailoredApps.Shared.EntityFramework/Interfaces/UnitOfWork/ITransaction.cs
+++ b/src/TailoredApps.Shared.EntityFramework/Interfaces/UnitOfWork/ITransaction.cs
@@ -1,21 +1,21 @@
-using System;
-
-namespace TailoredApps.Shared.EntityFramework.Interfaces.UnitOfWork
-{
-    /// <summary>
-    /// Represents an active database transaction managed by the Unit of Work.
-    /// Provides commit and rollback operations and must be disposed when no longer needed.
-    /// </summary>
-    public interface ITransaction : IDisposable
-    {
-        /// <summary>
-        /// Commits all changes made within this transaction to the database.
-        /// </summary>
-        void Commit();
-
-        /// <summary>
-        /// Rolls back all changes made within this transaction, discarding any pending modifications.
-        /// </summary>
-        void Rollback();
-    }
-}
+using System;
+
+namespace TailoredApps.Shared.EntityFramework.Interfaces.UnitOfWork
+{
+    /// <summary>
+    /// Represents an active database transaction managed by the Unit of Work.
+    /// Provides commit and rollback operations and must be disposed when no longer needed.
+    /// </summary>
+    public interface ITransaction : IDisposable
+    {
+        /// <summary>
+        /// Commits all changes made within this transaction to the database.
+        /// </summary>
+        void Commit();
+
+        /// <summary>
+        /// Rolls back all changes made within this transaction, discarding any pending modifications.
+        /// </summary>
+        void Rollback();
+    }
+}
diff --git a/src/TailoredApps.Shared.EntityFramework/Interfaces/UnitOfWork/IUnitOfWork.cs b/src/TailoredApps.Shared.EntityFramework/Interfaces/UnitOfWork/IUnitOfWork.cs
index c2cd1ee..a293ef8 100644
--- a/src/TailoredApps.Shared.EntityFramework/Interfaces/UnitOfWork/IUnitOfWork.cs
+++ b/src/TailoredApps.Shared.EntityFramework/Interfaces/UnitOfWork/IUnitOfWork.cs
@@ -1,80 +1,80 @@
-using System;
-using System.Data;
-using System.Threading;
-using System.Threading.Tasks;
-
-namespace TailoredApps.Shared.EntityFramework.Interfaces.UnitOfWork
-{
-    /// <summary>
-    /// Defines the core contract for the Unit of Work pattern, providing transaction management
-    /// and change persistence over an underlying data provider.
-    /// </summary>
-    public interface IUnitOfWork : IDisposable
-    {
-        /// <summary>
-        /// Gets a value indicating whether a database transaction is currently open.
-        /// </summary>
-        bool HasOpenTransaction { get; }
-
-        /// <summary>
-        /// Opens a new transaction if no transaction is currently open.
-        /// This method should only be used if you need to open a transaction
-        /// in one exact moment. Otherwise, let Unit of Work open it for you
-        /// in a convenient time.
-        /// </summary>
-        void BeginTransactionManually();
-
-        /// <summary>
-        /// Commits the current transaction (if one is open)
-        /// </summary>
-        void CommitTransaction();
-
-        /// <summary>
-        /// Commits the current transaction (if one is open) and sets the isolation level for new ones.
-        /// </summary>
-        void CommitTransaction(IsolationLevel isolationLevel);
-
-        /// <summary>
-        /// Rolls back the current transaction (if one is open)
-        /// </summary>
-        void RollbackTransaction();
-
-        /// <summary>
-        /// Rolls back the current transaction (if one is open) and sets the isolation level for new ones.
-        /// </summary>
-        void RollbackTransaction(IsolationLevel isolationLevel);
-
-        /// <summary>
-        /// Saves changes to database. If no transaction has been created yet,
-        /// this method will open a new transaction with isolation level set in UoW
-        /// before saving changes.
-        /// </summary>
-        int SaveChanges();
-
-        /// <summary>
-        /// Asynchronously saves changes to database. If no transaction has been created yet,
-        /// this method will open a new transaction with isolation level set in UoW
-        /// before saving changes.
-        /// </summary>
-        Task<int> SaveChangesAsync(CancellationToken cancellationToken = default(CancellationToken));
-
-        /// <summary>
-        /// Sets the isolation level for new transactions. This method does not
-        /// change the isolation level of the currently open transaction.
-        /// </summary>
-        /// <param name="isolationLevel"></param>
-        void SetIsolationLevel(IsolationLevel isolationLevel);
-    }
-
-    /// <summary>
-    /// Extends <see cref="IUnitOfWork"/> with access to a typed data provider (e.g. a repository or DbContext facade).
-    /// </summary>
-    /// <typeparam name="T">The type of the data provider exposed by this unit of work.</typeparam>
-    public interface IUnitOfWork<T> : IUnitOfWork
-    {
-        /// <summary>
-        /// Gets the underlying data provider (e.g. a DbContext interface or repository) for this unit of work.
-        /// </summary>
-        T DataProvider { get; }
-    }
-}
+using System;
+using System.Data;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace TailoredApps.Shared.EntityFramework.Interfaces.UnitOfWork
+{
+    /// <summary>
+    /// Defines the core contract for the Unit of Work pattern, providing transaction management
+    /// and change persistence over an underlying data provider.
+    /// </summary>
+    public interface IUnitOfWork : IDisposable
+    {
+        /// <summary>
+        /// Gets a value indicating whether a database transaction is currently open.
+        /// </summary>
+        bool HasOpenTransaction { get; }
+
+        /// <summary>
+        /// Opens a new transaction if no transaction is currently open.
+        /// This method should only be used if you need to open a transaction
+        /// in one exact moment. Otherwise, let Unit of Work open it for you
+        /// in a convenient time.
+        /// </summary>
+        void BeginTransactionManually();
+
+        /// <summary>
+        /// Commits the current transaction (if one is open)
+        /// </summary>
+        void CommitTransaction();
+
+        /// <summary>
+        /// Commits the current transaction (if one is open) and sets the isolation level for new ones.
+        /// </summary>
+        void CommitTransaction(IsolationLevel isolationLevel);
+
+        /// <summary>
+        /// Rolls back the current transaction (if one is open)
+        /// </summary>
+        void RollbackTransaction();
+
+        /// <summary>
+        /// Rolls back the current transaction (if one is open) and sets the isolation level for new ones.
+        /// </summary>
+        void RollbackTransaction(IsolationLevel isolationLevel);
+
+        /// <summary>
+        /// Saves changes to database. If no transaction has been created yet,
+        /// this method will open a new transaction with isolation level set in UoW
+        /// before saving changes.
+        /// </summary>
+        int SaveChanges();
+
+        /// <summary>
+        /// Asynchronously saves changes to database. If no transaction has been created yet,
+        /// this method will open a new transaction with isolation level set in UoW
+        /// before saving changes.
+        /// </summary>
+        Task<int> SaveChangesAsync(CancellationToken cancellationToken = default(CancellationToken));
+
+        /// <summary>
+        /// Sets the isolation level for new transactions. This method does not
+        /// change the isolation level of the currently open transaction.
+        /// </summary>
+        /// <param name="isolationLevel"></param>
+        void SetIsolationLevel(IsolationLevel isolationLevel);
+    }
+
+    /// <summary>
+    /// Extends <see cref="IUnitOfWork"/> with access to a typed data provider (e.g. a repository or DbContext facade).
+    /// </summary>
+    /// <typeparam name="T">The type of the data provider exposed by this unit of work.</typeparam>
+    public interface IUnitOfWork<T> : IUnitOfWork
+    {
+        /// <summary>
+        /// Gets the underlying data provider (e.g. a DbContext interface or repository) for this unit of work.
+        /// </summary>
+        T DataProvider { get; }
+    }
+}
diff --git a/src/TailoredApps.Shared.EntityFramework/Interfaces/UnitOfWork/IUnitOfWorkContext.cs b/src/TailoredApps.Shared.EntityFramework/Interfaces/UnitOfWork/IUnitOfWorkContext.cs
index dbe7f05..8676014 100644
--- a/src/TailoredApps.Shared.EntityFramework/Interfaces/UnitOfWork/IUnitOfWorkContext.cs
+++ b/src/TailoredApps.Shared.EntityFramework/Interfaces/UnitOfWork/IUnitOfWorkContext.cs
@@ -1,51 +1,51 @@
-using System.Data;
-using System.Data.Common;
-using System.Threading;
-using System.Threading.Tasks;
-
-namespace TailoredApps.Shared.EntityFramework.Interfaces.UnitOfWork
-{
-    /// <summary>
-    /// Provides low-level database operations used internally by the Unit of Work implementation:
-    /// transaction management, change persistence, change discarding, and raw connection access.
-    /// </summary>
-    public interface IUnitOfWorkContext
-    {
-        /// <summary>
-        /// Begins a new database transaction with the default isolation level.
-        /// </summary>
-        /// <returns>An <see cref="ITransaction"/> representing the open transaction.</returns>
-        ITransaction BeginTransaction();
-
-        /// <summary>
-        /// Begins a new database transaction with the specified isolation level.
-        /// </summary>
-        /// <param name="isolationLevel">The isolation level for the transaction.</param>
-        /// <returns>An <see cref="ITransaction"/> representing the open transaction.</returns>
-        ITransaction BeginTransaction(IsolationLevel isolationLevel);
-
-        /// <summary>
-        /// Saves all pending changes in the current context to the database.
-        /// </summary>
-        /// <returns>The number of state entries written to the database.</returns>
-        int SaveChanges();
-
-        /// <summary>
-        /// Asynchronously saves all pending changes in the current context to the database.
-        /// </summary>
-        /// <param name="cancellationToken">A token to cancel the operation.</param>
-        /// <returns>The number of state entries written to the database.</returns>
-        Task<int> SaveChangesAsync(CancellationToken cancellationToken = default(CancellationToken));
-
-        /// <summary>
-        /// Detaches all tracked entities, effectively discarding any unsaved changes.
-        /// </summary>
-        void DiscardChanges();
-
-        /// <summary>
-        /// Returns the underlying <see cref="DbConnection"/> used by this context.
-        /// </summary>
-        /// <returns>The active database connection.</returns>
-        DbConnection GetDbConnection();
-    }
-}
+using System.Data;
+using System.Data.Common;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace TailoredApps.Shared.EntityFramework.Interfaces.UnitOfWork
+{
+    /// <summary>
+    /// Provides low-level database operations used internally by the Unit of Work implementation:
+    /// transaction management, change persistence, change discarding, and raw connection access.
+    /// </summary>
+    public interface IUnitOfWorkContext
+    {
+        /// <summary>
+        /// Begins a new database transaction with the default isolation level.
+        /// </summary>
+        /// <returns>An <see cref="ITransaction"/> representing the open transaction.</returns>
+        ITransaction BeginTransaction();
+
+        /// <summary>
+        /// Begins a new database transaction with the specified isolation level.
+        /// </summary>
+        /// <param name="isolationLevel">The isolation level for the transaction.</param>
+        /// <returns>An <see cref="ITransaction"/> representing the open transaction.</returns>
+        ITransaction BeginTransaction(IsolationLevel isolationLevel);
+
+        /// <summary>
+        /// Saves all pending changes in the current context to the database.
+        /// </summary>
+        /// <returns>The number of state entries written to the database.</returns>
+        int SaveChanges();
+
+        /// <summary>
+        /// Asynchronously saves all pending changes in the current context to the database.
+        /// </summary>
+        /// <param name="cancellationToken">A token to cancel the operation.</param>
+        /// <returns>The number of state entries written to the database.</returns>
+        Task<int> SaveChangesAsync(CancellationToken cancellationToken = default(CancellationToken));
+
+        /// <summary>
+        /// Detaches all tracked entities, effectively discarding any unsaved changes.
+        /// </summary>
+        void DiscardChanges();
+
+        /// <summary>
+        /// Returns the underlying <see cref="DbConnection"/> used by this context.
+        /// </summary>
+        /// <returns>The active database connection.</returns>
+        DbConnection GetDbConnection();
+    }
+}
diff --git a/src/TailoredApps.Shared.EntityFramework/Interfaces/UnitOfWork/IUnitOfWorkOptionsBuilder.cs b/src/TailoredApps.Shared.EntityFramework/Interfaces/UnitOfWork/IUnitOfWorkOptionsBuilder.cs
index 97f54ab..d84fe6c 100644
--- a/src/TailoredApps.Shared.EntityFramework/Interfaces/UnitOfWork/IUnitOfWorkOptionsBuilder.cs
+++ b/src/TailoredApps.Shared.EntityFramework/Interfaces/UnitOfWork/IUnitOfWorkOptionsBuilder.cs
@@ -1,76 +1,76 @@
-using Microsoft.Extensions.DependencyInjection;
-using System;
-
-namespace TailoredApps.Shared.EntityFramework.Interfaces.UnitOfWork
-{
-    /// <summary>
-    /// Fluent builder for configuring Unit of Work lifecycle hooks during application startup.
-    /// </summary>
-    public interface IUnitOfWorkOptionsBuilder
-    {
-        /// <summary>
-        /// Registers a <see cref="ITransactionCommitHook"/> implementation (resolved via DI).
-        /// </summary>
-        /// <typeparam name="THook">The hook implementation type.</typeparam>
-        /// <returns>The current builder for further chaining.</returns>
-        IUnitOfWorkOptionsBuilder WithTransactionCommitHook<THook>() where THook : class, ITransactionCommitHook;
-
-        /// <summary>
-        /// Registers a <see cref="ITransactionCommitHook"/> implementation using a factory delegate.
-        /// </summary>
-        /// <typeparam name="THook">The hook implementation type.</typeparam>
-        /// <param name="implementationFactory">A factory that creates the hook instance.</param>
-        /// <returns>The current builder for further chaining.</returns>
-        IUnitOfWorkOptionsBuilder WithTransactionCommitHook<THook>(Func<IServiceProvider, THook> implementationFactory) where THook : class, ITransactionCommitHook;
-
-        /// <summary>
-        /// Registers a <see cref="ITransactionRollbackHook"/> implementation (resolved via DI).
-        /// </summary>
-        /// <typeparam name="THook">The hook implementation type.</typeparam>
-        /// <returns>The current builder for further chaining.</returns>
-        IUnitOfWorkOptionsBuilder WithTransactionRollbackHook<THook>() where THook : class, ITransactionRollbackHook;
-
-        /// <summary>
-        /// Registers a <see cref="ITransactionRollbackHook"/> implementation using a factory delegate.
-        /// </summary>
-        /// <typeparam name="THook">The hook implementation type.</typeparam>
-        /// <param name="implementationFactory">A factory that creates the hook instance.</param>
-        /// <returns>The current builder for further chaining.</returns>
-        IUnitOfWorkOptionsBuilder WithTransactionRollbackHook<THook>(Func<IServiceProvider, THook> implementationFactory) where THook : class, ITransactionRollbackHook;
-
-        /// <summary>
-        /// Registers a <see cref="IPreSaveChangesHook"/> implementation (resolved via DI).
-        /// </summary>
-        /// <typeparam name="THook">The hook implementation type.</typeparam>
-        /// <returns>The current builder for further chaining.</returns>
-        IUnitOfWorkOptionsBuilder WithPreSaveChangesHook<THook>() where THook : class, IPreSaveChangesHook;
-
-        /// <summary>
-        /// Registers a <see cref="IPreSaveChangesHook"/> implementation using a factory delegate.
-        /// </summary>
-        /// <typeparam name="THook">The hook implementation type.</typeparam>
-        /// <param name="implementationFactory">A factory that creates the hook instance.</param>
-        /// <returns>The current builder for further chaining.</returns>
-        IUnitOfWorkOptionsBuilder WithPreSaveChangesHook<THook>(Func<IServiceProvider, THook> implementationFactory) where THook : class, IPreSaveChangesHook;
-
-        /// <summary>
-        /// Registers a <see cref="IPostSaveChangesHook"/> implementation (resolved via DI).
-        /// </summary>
-        /// <typeparam name="THook">The hook implementation type.</typeparam>
-        /// <returns>The current builder for further chaining.</returns>
-        IUnitOfWorkOptionsBuilder WithPostSaveChangesHook<THook>() where THook : class, IPostSaveChangesHook;
-
-        /// <summary>
-        /// Registers a <see cref="IPostSaveChangesHook"/> implementation using a factory delegate.
-        /// </summary>
-        /// <typeparam name="THook">The hook implementation type.</typeparam>
-        /// <param name="implementationFactory">A factory that creates the hook instance.</param>
-        /// <returns>The current builder for further chaining.</returns>
-        IUnitOfWorkOptionsBuilder WithPostSaveChangesHook<THook>(Func<IServiceProvider, THook> implementationFactory) where THook : class, IPostSaveChangesHook;
-
-        /// <summary>
-        /// Gets the underlying <see cref="IServiceCollection"/> used for DI registrations.
-        /// </summary>
-        IServiceCollection Services { get; }
-    }
-}
+using System;
+using Microsoft.Extensions.DependencyInjection;
+
+namespace TailoredApps.Shared.EntityFramework.Interfaces.UnitOfWork
+{
+    /// <summary>
+    /// Fluent builder for configuring Unit of Work lifecycle hooks during application startup.
+    /// </summary>
+    public interface IUnitOfWorkOptionsBuilder
+    {
+        /// <summary>
+        /// Registers a <see cref="ITransactionCommitHook"/> implementation (resolved via DI).
+        /// </summary>
+        /// <typeparam name="THook">The hook implementation type.</typeparam>
+        /// <returns>The current builder for further chaining.</returns>
+        IUnitOfWorkOptionsBuilder WithTransactionCommitHook<THook>() where THook : class, ITransactionCommitHook;
+
+        /// <summary>
+        /// Registers a <see cref="ITransactionCommitHook"/> implementation using a factory delegate.
+        /// </summary>
+        /// <typeparam name="THook">The hook implementation type.</typeparam>
+        /// <param name="implementationFactory">A factory that creates the hook instance.</param>
+        /// <returns>The current builder for further chaining.</returns>
+        IUnitOfWorkOptionsBuilder WithTransactionCommitHook<THook>(Func<IServiceProvider, THook> implementationFactory) where THook : class, ITransactionCommitHook;
+
+        /// <summary>
+        /// Registers a <see cref="ITransactionRollbackHook"/> implementation (resolved via DI).
+        /// </summary>
+        /// <typeparam name="THook">The hook implementation type.</typeparam>
+        /// <returns>The current builder for further chaining.</returns>
+        IUnitOfWorkOptionsBuilder WithTransactionRollbackHook<THook>() where THook : class, ITransactionRollbackHook;
+
+        /// <summary>
+        /// Registers a <see cref="ITransactionRollbackHook"/> implementation using a factory delegate.
+        /// </summary>
+        /// <typeparam name="THook">The hook implementation type.</typeparam>
+        /// <param name="implementationFactory">A factory that creates the hook instance.</param>
+        /// <returns>The current builder for further chaining.</returns>
+        IUnitOfWorkOptionsBuilder WithTransactionRollbackHook<THook>(Func<IServiceProvider, THook> implementationFactory) where THook : class, ITransactionRollbackHook;
+
+        /// <summary>
+        /// Registers a <see cref="IPreSaveChangesHook"/> implementation (resolved via DI).
+        /// </summary>
+        /// <typeparam name="THook">The hook implementation type.</typeparam>
+        /// <returns>The current builder for further chaining.</returns>
+        IUnitOfWorkOptionsBuilder WithPreSaveChangesHook<THook>() where THook : class, IPreSaveChangesHook;
+
+        /// <summary>
+        /// Registers a <see cref="IPreSaveChangesHook"/> implementation using a factory delegate.
+        /// </summary>
+        /// <typeparam name="THook">The hook implementation type.</typeparam>
+        /// <param name="implementationFactory">A factory that creates the hook instance.</param>
+        /// <returns>The current builder for further chaining.</returns>
+        IUnitOfWorkOptionsBuilder WithPreSaveChangesHook<THook>(Func<IServiceProvider, THook> implementationFactory) where THook : class, IPreSaveChangesHook;
+
+        /// <summary>
+        /// Registers a <see cref="IPostSaveChangesHook"/> implementation (resolved via DI).
+        /// </summary>
+        /// <typeparam name="THook">The hook implementation type.</typeparam>
+        /// <returns>The current builder for further chaining.</returns>
+        IUnitOfWorkOptionsBuilder WithPostSaveChangesHook<THook>() where THook : class, IPostSaveChangesHook;
+
+        /// <summary>
+        /// Registers a <see cref="IPostSaveChangesHook"/> implementation using a factory delegate.
+        /// </summary>
+        /// <typeparam name="THook">The hook implementation type.</typeparam>
+        /// <param name="implementationFactory">A factory that creates the hook instance.</param>
+        /// <returns>The current builder for further chaining.</returns>
+        IUnitOfWorkOptionsBuilder WithPostSaveChangesHook<THook>(Func<IServiceProvider, THook> implementationFactory) where THook : class, IPostSaveChangesHook;
+
+        /// <summary>
+        /// Gets the underlying <see cref="IServiceCollection"/> used for DI registrations.
+        /// </summary>
+        IServiceCollection Services { get; }
+    }
+}
diff --git a/src/TailoredApps.Shared.EntityFramework/Logging/EFLoggerToConsole.cs b/src/TailoredApps.Shared.EntityFramework/Logging/EFLoggerToConsole.cs
index ddf59dc..248dd05 100644
--- a/src/TailoredApps.Shared.EntityFramework/Logging/EFLoggerToConsole.cs
+++ b/src/TailoredApps.Shared.EntityFramework/Logging/EFLoggerToConsole.cs
@@ -1,76 +1,103 @@
-using Microsoft.EntityFrameworkCore.Storage;
-using Microsoft.Extensions.Logging;
-using System;
-
-namespace TailoredApps.Shared.EntityFramework.Logging
-{
-    /// <summary>
-    /// An <see cref="ILoggerProvider"/> that routes Entity Framework Core relational command
-    /// log entries to the console. All other categories are silenced via a no-op logger.
-    /// </summary>
-    public class EFLoggerToConsole : ILoggerProvider
-    {
-        /// <summary>
-        /// Creates an <see cref="ILogger"/> for the given category.
-        /// Returns a console logger for EF Core relational commands and a no-op logger for everything else.
-        /// </summary>
-        /// <param name="categoryName">The logger category name.</param>
-        /// <returns>An <see cref="ILogger"/> instance appropriate for the category.</returns>
-        public ILogger CreateLogger(string categoryName)
-        {
-            // NOTE: This sample uses EF Core 1.1. If using EF Core 1.0, then use 
-            //       Microsoft.EntityFrameworkCore.Storage.Internal.RelationalCommandBuilderFactory
-            //       rather than IRelationalCommandBuilderFactory
-
-            if (categoryName == typeof(RelationalCommandBuilderFactory).FullName)
-            {
-                return new EFConsoleLogger();
-            }
-
-            return new NullLogger();
-        }
-
-        /// <summary>
-        /// Releases all resources used by this provider.
-        /// </summary>
-        public void Dispose()
-        { }
-
-        private class EFConsoleLogger : ILogger
-        {
-            public bool IsEnabled(LogLevel logLevel)
-            {
-                return true;
-            }
-
-            public void Log<TState>(LogLevel logLevel, EventId eventId, TState state, Exception exception, Func<TState, Exception, string> formatter)
-            {
-                Console.WriteLine(formatter(state, exception));
-            }
-
-            public IDisposable BeginScope<TState>(TState state)
-            {
-                return null;
-            }
-        }
-
-        private class NullLogger : ILogger
-        {
-            public bool IsEnabled(LogLevel logLevel)
-            {
-                return false;
-            }
-
-            public void Log<TState>(LogLevel logLevel, EventId eventId, TState state, Exception exception, Func<TState, Exception, string> formatter)
-            {
-                Console.WriteLine(formatter(state, exception));
-
-            }
-
-            public IDisposable BeginScope<TState>(TState state)
-            {
-                return null;
-            }
-        }
-    }
-}
+using System;
+using Microsoft.EntityFrameworkCore.Storage;
+using Microsoft.Extensions.Logging;
+
+namespace TailoredApps.Shared.EntityFramework.Logging
+{
+    /// <summary>
+    /// An <see cref="ILoggerProvider"/> that routes Entity Framework Core relational command
+    /// log entries to the console. All other categories are silenced via a no-op logger.
+    /// </summary>
+    public class EFLoggerToConsole : ILoggerProvider
+    {
+        /// <summary>
+        /// Creates an <see cref="ILogger"/> for the given category.
+        /// Returns a console logger for EF Core relational commands and a no-op logger for everything else.
+        /// </summary>
+        /// <param name="categoryName">The logger category name.</param>
+        /// <returns>An <see cref="ILogger"/> instance appropriate for the category.</returns>
+        public ILogger CreateLogger(string categoryName)
+        {
+            // NOTE: This sample uses EF Core 1.1. If using EF Core 1.0, then use 
+            //       Microsoft.EntityFrameworkCore.Storage.Internal.RelationalCommandBuilderFactory
+            //       rather than IRelationalCommandBuilderFactory
+
+            if (categoryName == typeof(RelationalCommandBuilderFactory).FullName)
+            {
+                return new EFConsoleLogger();
+            }
+
+            return new NullLogger();
+        }
+
+        /// <summary>
+        /// Releases all resources used by this provider.
+        /// </summary>
+        public void Dispose()
+        { }
+
+        /// <summary>
+        /// An <see cref="ILogger"/> implementation that writes all log entries to the console.
+        /// Used for EF Core relational command logging.
+        /// </summary>
+        private class EFConsoleLogger : ILogger
+        {
+            /// <summary>
+            /// Always returns <c>true</c>; all log levels are enabled.
+            /// </summary>
+            public bool IsEnabled(LogLevel logLevel)
+            {
+                return true;
+            }
+
+            /// <summary>
+            /// Formats the log entry using <paramref name="formatter"/> and writes it to the console.
+            /// </summary>
+            public void Log<TState>(LogLevel logLevel, EventId eventId, TState state, Exception exception, Func<TState, Exception, string> formatter)
+            {
+                Console.WriteLine(formatter(state, exception));
+            }
+
+            /// <summary>
+            /// Begins a logical operation scope. Returns <c>null</c> (no-op).
+            /// </summary>
+            public IDisposable BeginScope<TState>(TState state)
+            {
+                return null;
+            }
+        }
+
+        /// <summary>
+        /// A no-op <see cref="ILogger"/> implementation that discards all log entries.
+        /// Used for all categories other than EF Core relational commands.
+        /// </summary>
+        private class NullLogger : ILogger
+        {
+            /// <summary>
+            /// Always returns <c>false</c>; all log levels are disabled.
+            /// </summary>
+            public bool IsEnabled(LogLevel logLevel)
+            {
+                return false;
+            }
+
+            /// <summary>
+            /// No-op log method. Writes the formatted message to the console even though
+            /// <see cref="IsEnabled"/> returns <c>false</c> — kept for legacy compatibility.
+            /// </summary>
+            public void Log<TState>(LogLevel logLevel, EventId eventId, TState state, Exception exception, Func<TState, Exception, string> formatter)
+            {
+                Console.WriteLine(formatter(state, exception));
+
+            }
+
+            /// <summary>
+            /// Begins a logical operation scope. Returns <c>null</c> (no-op).
+            /// </summary>
+            public IDisposable BeginScope<TState>(TState state)
+            {
+                return null;
+            }
+        }
+    }
+}
diff --git a/src/TailoredApps.Shared.EntityFramework/Querying/PagedResult.cs b/src/TailoredApps.Shared.EntityFramework/Querying/PagedResult.cs
index 7d529f2..5f1ea44 100644
--- a/src/TailoredApps.Shared.EntityFramework/Querying/PagedResult.cs
+++ b/src/TailoredApps.Shared.EntityFramework/Querying/PagedResult.cs
@@ -1,93 +1,93 @@
-using Microsoft.EntityFrameworkCore;
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Threading.Tasks;
-using TailoredApps.Shared.Querying;
-
-namespace TailoredApps.Shared.EntityFramework.Querying
-{
-    /// <summary>
-    /// Represents a single page of query results along with the total record count.
-    /// Can be constructed from a <see cref="PagingQuery{T}"/> for deferred execution
-    /// or directly from an in-memory list.
-    /// </summary>
-    /// <typeparam name="T">The type of items in the paged result.</typeparam>
-    public class PagedResult<T> : IPagedResult<T>
-    {
-        private static readonly IEnumerable<T> EmptyList = Enumerable.Empty<T>();
-        private readonly PagingQuery<T> pagingQuery;
-
-        /// <summary>
-        /// Initializes a new instance of <see cref="PagedResult{T}"/> backed by a <see cref="PagingQuery{T}"/>.
-        /// Call <see cref="GetPagedResultAsync"/> or <see cref="GetPagedResult"/> to execute the query.
-        /// </summary>
-        /// <param name="pagingQuery">The paging query that will provide the results.</param>
-        public PagedResult(PagingQuery<T> pagingQuery)
-        {
-            if (pagingQuery == null) throw new ArgumentNullException(nameof(pagingQuery));
-            this.pagingQuery = pagingQuery;
-        }
-
-        /// <summary>
-        /// Initializes a new instance of <see cref="PagedResult{T}"/> from an already-materialized list.
-        /// </summary>
-        /// <param name="results">The list of items for this page.</param>
-        /// <param name="count">
-        /// The total number of records across all pages. Defaults to the size of <paramref name="results"/>
-        /// when not provided.
-        /// </param>
-        public PagedResult(List<T> results, int? count = null)
-        {
-            Results = results ?? throw new ArgumentNullException(nameof(results));
-            Count = count ?? results.Count;
-        }
-
-        /// <summary>
-        /// Asynchronously executes the underlying <see cref="PagingQuery{T}"/> and populates
-        /// <see cref="Results"/> and <see cref="Count"/>.
-        /// </summary>
-        /// <returns>This instance with <see cref="Results"/> and <see cref="Count"/> populated.</returns>
-        public async Task<PagedResult<T>> GetPagedResultAsync()
-        {
-            Results = pagingQuery.IsMoreDataToFetch ? await pagingQuery.ToListAsync() : EmptyList.ToList();
-            Count = pagingQuery.TotalCount > 0 ? pagingQuery.TotalCount : Results.Count;
-            return this;
-        }
-
-        /// <summary>
-        /// Synchronously executes the underlying <see cref="PagingQuery{T}"/> and populates
-        /// <see cref="Results"/> and <see cref="Count"/>.
-        /// </summary>
-        /// <returns>This instance with <see cref="Results"/> and <see cref="Count"/> populated.</returns>
-        public PagedResult<T> GetPagedResult()
-        {
-            if (pagingQuery == null) throw new ArgumentNullException(nameof(pagingQuery));
-
-
-            Results = pagingQuery.IsMoreDataToFetch ? pagingQuery.ToList() : EmptyList.ToList();
-            Count = pagingQuery.TotalCount > 0 ? pagingQuery.TotalCount : Results.Count;
-            return this;
-        }
-
-        private PagedResult()
-        {
-            Results = EmptyList.ToList();
-        }
-
-        /// <summary>
-        /// Gets or sets the collection of items for the current page.
-        /// </summary>
-        public ICollection<T> Results { get; set; }
-
-        /// <summary>
-        /// Gets or sets the total number of records across all pages.
-        /// </summary>
-        public int Count { get; set; }
-
-        /// <summary>
-        /// Gets an empty <see cref="PagedResult{T}"/> with no results and a count of zero.
-        /// </summary>
-        public static PagedResult<T> Empty => new PagedResult<T>();
-    }
-}
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+using Microsoft.EntityFrameworkCore;
+using TailoredApps.Shared.Querying;
+
+namespace TailoredApps.Shared.EntityFramework.Querying
+{
+    /// <summary>
+    /// Represents a single page of query results along with the total record count.
+    /// Can be constructed from a <see cref="PagingQuery{T}"/> for deferred execution
+    /// or directly from an in-memory list.
+    /// </summary>
+    /// <typeparam name="T">The type of items in the paged result.</typeparam>
+    public class PagedResult<T> : IPagedResult<T>
+    {
+        private static readonly IEnumerable<T> EmptyList = Enumerable.Empty<T>();
+        private readonly PagingQuery<T> pagingQuery;
+
+        /// <summary>
+        /// Initializes a new instance of <see cref="PagedResult{T}"/> backed by a <see cref="PagingQuery{T}"/>.
+        /// Call <see cref="GetPagedResultAsync"/> or <see cref="GetPagedResult"/> to execute the query.
+        /// </summary>
+        /// <param name="pagingQuery">The paging query that will provide the results.</param>
+        public PagedResult(PagingQuery<T> pagingQuery)
+        {
+            if (pagingQuery == null) throw new ArgumentNullException(nameof(pagingQuery));
+            this.pagingQuery = pagingQuery;
+        }
+
+        /// <summary>
+        /// Initializes a new instance of <see cref="PagedResult{T}"/> from an already-materialized list.
+        /// </summary>
+        /// <param name="results">The list of items for this page.</param>
+        /// <param name="count">
+        /// The total number of records across all pages. Defaults to the size of <paramref name="results"/>
+        /// when not provided.
+        /// </param>
+        public PagedResult(List<T> results, int? count = null)
+        {
+            Results = results ?? throw new ArgumentNullException(nameof(results));
+            Count = count ?? results.Count;
+        }
+
+        /// <summary>
+        /// Asynchronously executes the underlying <see cref="PagingQuery{T}"/> and populates
+        /// <see cref="Results"/> and <see cref="Count"/>.
+        /// </summary>
+        /// <returns>This instance with <see cref="Results"/> and <see cref="Count"/> populated.</returns>
+        public async Task<PagedResult<T>> GetPagedResultAsync()
+        {
+            Results = pagingQuery.IsMoreDataToFetch ? await pagingQuery.ToListAsync() : EmptyList.ToList();
+            Count = pagingQuery.TotalCount > 0 ? pagingQuery.TotalCount : Results.Count;
+            return this;
+        }
+
+        /// <summary>
+        /// Synchronously executes the underlying <see cref="PagingQuery{T}"/> and populates
+        /// <see cref="Results"/> and <see cref="Count"/>.
+        /// </summary>
+        /// <returns>This instance with <see cref="Results"/> and <see cref="Count"/> populated.</returns>
+        public PagedResult<T> GetPagedResult()
+        {
+            if (pagingQuery == null) throw new ArgumentNullException(nameof(pagingQuery));
+
+
+            Results = pagingQuery.IsMoreDataToFetch ? pagingQuery.ToList() : EmptyList.ToList();
+            Count = pagingQuery.TotalCount > 0 ? pagingQuery.TotalCount : Results.Count;
+            return this;
+        }
+
+        private PagedResult()
+        {
+            Results = EmptyList.ToList();
+        }
+
+        /// <summary>
+        /// Gets or sets the collection of items for the current page.
+        /// </summary>
+        public ICollection<T> Results { get; set; }
+
+        /// <summary>
+        /// Gets or sets the total number of records across all pages.
+        /// </summary>
+        public int Count { get; set; }
+
+        /// <summary>
+        /// Gets an empty <see cref="PagedResult{T}"/> with no results and a count of zero.
+        /// </summary>
+        public static PagedResult<T> Empty => new PagedResult<T>();
+    }
+}
diff --git a/src/TailoredApps.Shared.EntityFramework/Querying/PagingQuery.cs b/src/TailoredApps.Shared.EntityFramework/Querying/PagingQuery.cs
index 21be5c5..713e04a 100644
--- a/src/TailoredApps.Shared.EntityFramework/Querying/PagingQuery.cs
+++ b/src/TailoredApps.Shared.EntityFramework/Querying/PagingQuery.cs
@@ -1,122 +1,122 @@
-using Microsoft.EntityFrameworkCore;
-using System;
-using System.Collections;
-using System.Collections.Generic;
-using System.Linq;
-using System.Linq.Expressions;
-using System.Threading.Tasks;
-using TailoredApps.Shared.Querying;
-
-namespace TailoredApps.Shared.EntityFramework.Querying
-{
-    /// <summary>
-    /// Wraps an <see cref="IQueryable{T}"/> with paging information, applying skip/take logic
-    /// based on the provided <see cref="IPagingParameters"/>. Implements <see cref="IQueryable{T}"/>
-    /// so it can be consumed directly by EF Core materialization methods.
-    /// </summary>
-    /// <typeparam name="T">The type of elements in the query.</typeparam>
-    public class PagingQuery<T> : IQueryable<T>
-    {
-        private readonly IPagingParameters pagingParameters;
-
-        /// <summary>
-        /// Initializes a new instance of <see cref="PagingQuery{T}"/>.
-        /// </summary>
-        /// <param name="query">The source queryable to page.</param>
-        /// <param name="pagingParameters">The paging parameters (page number and page size).</param>
-        public PagingQuery(IQueryable<T> query, IPagingParameters pagingParameters)
-        {
-            if (pagingParameters == null)
-                throw new ArgumentNullException(nameof(pagingParameters));
-
-            if (query == null)
-                throw new ArgumentNullException(nameof(query));
-
-            Query = query;
-            this.pagingParameters = pagingParameters;
-
-        }
-
-        /// <summary>
-        /// Asynchronously counts total records and applies skip/take to <see cref="Query"/>
-        /// when paging parameters are specified.
-        /// </summary>
-        /// <returns>This instance with paging applied.</returns>
-        public async Task<PagingQuery<T>> GetPagingQueryAsync()
-        {
-
-            TotalCount = await Query.CountAsync();
-            if (pagingParameters.IsPagingSpecified)
-            {
-                PageCount = pagingParameters.Count.Value;
-                PageNumber = pagingParameters.Page.Value;
-                Query = Query.Skip(InternalPageNumber * PageCount).Take(PageCount);
-            }
-            return this;
-        }
-
-        /// <summary>
-        /// Synchronously counts total records and applies skip/take to <see cref="Query"/>
-        /// when paging parameters are specified.
-        /// </summary>
-        /// <returns>This instance with paging applied.</returns>
-        public PagingQuery<T> GetPagingQuery()
-        {
-
-            TotalCount = Query.Count();
-            if (pagingParameters.IsPagingSpecified)
-            {
-                PageCount = pagingParameters.Count.Value;
-                PageNumber = pagingParameters.Page.Value;
-                Query = Query.Skip(InternalPageNumber * PageCount).Take(PageCount);
-            }
-            return this;
-        }
-
-        /// <summary>
-        /// Gets the underlying queryable with optional skip/take applied.
-        /// </summary>
-        public IQueryable<T> Query { get; private set; }
-
-        /// <summary>
-        /// Gets the 1-based page number requested.
-        /// </summary>
-        public int PageNumber { get; private set; }
-
-        /// <summary>
-        /// Gets the number of items per page.
-        /// </summary>
-        public int PageCount { get; private set; }
-
-        /// <summary>
-        /// Gets the total number of records in the unpaged query.
-        /// </summary>
-        public int TotalCount { get; private set; }
-
-        /// <summary>
-        /// Gets a value indicating whether there are more records to fetch for the requested page.
-        /// </summary>
-#if DEBUG
-        public bool IsMoreDataToFetch => TotalCount < PageCount || InternalPageNumber * PageCount <= TotalCount;
-#else
-        public bool IsMoreDataToFetch => TotalCount > 0 && (TotalCount < PageCount || InternalPageNumber * PageCount <= TotalCount);
-#endif
-
-        /// <inheritdoc/>
-        public IEnumerator<T> GetEnumerator() => Query.GetEnumerator();
-
-        /// <inheritdoc/>
-        IEnumerator IEnumerable.GetEnumerator() => GetEnumerator();
-
-        /// <inheritdoc/>
-        public Expression Expression => Query.Expression;
-
-        /// <inheritdoc/>
-        public Type ElementType => Query.ElementType;
-
-        /// <inheritdoc/>
-        public IQueryProvider Provider => Query.Provider;
-
-        private int InternalPageNumber => PageNumber - 1;
-    }
-}
+using System;
+using System.Collections;
+using System.Collections.Generic;
+using System.Linq;
+using System.Linq.Expressions;
+using System.Threading.Tasks;
+using Microsoft.EntityFrameworkCore;
+using TailoredApps.Shared.Querying;
+
+namespace TailoredApps.Shared.EntityFramework.Querying
+{
+    /// <summary>
+    /// Wraps an <see cref="IQueryable{T}"/> with paging information, applying skip/take logic
+    /// based on the provided <see cref="IPagingParameters"/>. Implements <see cref="IQueryable{T}"/>
+    /// so it can be consumed directly by EF Core materialization methods.
+    /// </summary>
+    /// <typeparam name="T">The type of elements in the query.</typeparam>
+    public class PagingQuery<T> : IQueryable<T>
+    {
+        private readonly IPagingParameters pagingParameters;
+
+        /// <summary>
+        /// Initializes a new instance of <see cref="PagingQuery{T}"/>.
+        /// </summary>
+        /// <param name="query">The source queryable to page.</param>
+        /// <param name="pagingParameters">The paging parameters (page number and page size).</param>
+        public PagingQuery(IQueryable<T> query, IPagingParameters pagingParameters)
+        {
+            if (pagingParameters == null)
+                throw new ArgumentNullException(nameof(pagingParameters));
+
+            if (query == null)
+                throw new ArgumentNullException(nameof(query));
+
+            Query = query;
+            this.pagingParameters = pagingParameters;
+
+        }
+
+        /// <summary>
+        /// Asynchronously counts total records and applies skip/take to <see cref="Query"/>
+        /// when paging parameters are specified.
+        /// </summary>
+        /// <returns>This instance with paging applied.</returns>
+        public async Task<PagingQuery<T>> GetPagingQueryAsync()
+        {
+
+            TotalCount = await Query.CountAsync();
+            if (pagingParameters.IsPagingSpecified)
+            {
+                PageCount = pagingParameters.Count.Value;
+                PageNumber = pagingParameters.Page.Value;
+                Query = Query.Skip(InternalPageNumber * PageCount).Take(PageCount);
+            }
+            return this;
+        }
+
+        /// <summary>
+        /// Synchronously counts total records and applies skip/take to <see cref="Query"/>
+        /// when paging parameters are specified.
+        /// </summary>
+        /// <returns>This instance with paging applied.</returns>
+        public PagingQuery<T> GetPagingQuery()
+        {
+
+            TotalCount = Query.Count();
+            if (pagingParameters.IsPagingSpecified)
+            {
+                PageCount = pagingParameters.Count.Value;
+                PageNumber = pagingParameters.Page.Value;
+                Query = Query.Skip(InternalPageNumber * PageCount).Take(PageCount);
+            }
+            return this;
+        }
+
+        /// <summary>
+        /// Gets the underlying queryable with optional skip/take applied.
+        /// </summary>
+        public IQueryable<T> Query { get; private set; }
+
+        /// <summary>
+        /// Gets the 1-based page number requested.
+        /// </summary>
+        public int PageNumber { get; private set; }
+
+        /// <summary>
+        /// Gets the number of items per page.
+        /// </summary>
+        public int PageCount { get; private set; }
+
+        /// <summary>
+        /// Gets the total number of records in the unpaged query.
+        /// </summary>
+        public int TotalCount { get; private set; }
+
+        /// <summary>
+        /// Gets a value indicating whether there are more records to fetch for the requested page.
+        /// </summary>
+#if DEBUG
+        public bool IsMoreDataToFetch => TotalCount < PageCount || InternalPageNumber * PageCount <= TotalCount;
+#else
+        public bool IsMoreDataToFetch => TotalCount > 0 && (TotalCount < PageCount || InternalPageNumber * PageCount <= TotalCount);
+#endif
+
+        /// <inheritdoc/>
+        public IEnumerator<T> GetEnumerator() => Query.GetEnumerator();
+
+        /// <inheritdoc/>
+        IEnumerator IEnumerable.GetEnumerator() => GetEnumerator();
+
+        /// <inheritdoc/>
+        public Expression Expression => Query.Expression;
+
+        /// <inheritdoc/>
+        public Type ElementType => Query.ElementType;
+
+        /// <inheritdoc/>
+        public IQueryProvider Provider => Query.Provider;
+
+        private int InternalPageNumber => PageNumber - 1;
+    }
+}
diff --git a/src/TailoredApps.Shared.EntityFramework/Querying/QueryFilterExtensions.cs b/src/TailoredApps.Shared.EntityFramework/Querying/QueryFilterExtensions.cs
index f715091..6f9427d 100644
--- a/src/TailoredApps.Shared.EntityFramework/Querying/QueryFilterExtensions.cs
+++ b/src/TailoredApps.Shared.EntityFramework/Querying/QueryFilterExtensions.cs
@@ -1,36 +1,36 @@
-using System;
-using System.Linq;
-using System.Linq.Expressions;
-using TailoredApps.Shared.EntityFramework.Interfaces;
-
-namespace TailoredApps.Shared.EntityFramework.Querying
-{
-    /// <summary>
-    /// Provides extension methods for filtering <see cref="IQueryable{T}"/> sequences of
-    /// <see cref="IModelBase"/> entities.
-    /// </summary>
-    public static class QueryFilterExtensions
-    {
-        /// <summary>
-        /// Applies an optional filter expression to the query.
-        /// If <paramref name="filter"/> is <c>null</c>, the original query is returned unchanged.
-        /// </summary>
-        /// <typeparam name="T">The entity type, constrained to <see cref="IModelBase"/>.</typeparam>
-        /// <param name="query">The source queryable to filter.</param>
-        /// <param name="filter">
-        /// The predicate expression to apply, or <c>null</c> to skip filtering.
-        /// </param>
-        /// <returns>The filtered (or original) queryable.</returns>
-        public static IQueryable<T> Filter<T>(
-            this IQueryable<T> query,
-            Expression<Func<T, bool>> filter)
-            where T : IModelBase
-        {
-            if (filter == null)
-                return query;
-
-            return query.Where(filter);
-        }
-    }
-
-}
+using System;
+using System.Linq;
+using System.Linq.Expressions;
+using TailoredApps.Shared.EntityFramework.Interfaces;
+
+namespace TailoredApps.Shared.EntityFramework.Querying
+{
+    /// <summary>
+    /// Provides extension methods for filtering <see cref="IQueryable{T}"/> sequences of
+    /// <see cref="IModelBase"/> entities.
+    /// </summary>
+    public static class QueryFilterExtensions
+    {
+        /// <summary>
+        /// Applies an optional filter expression to the query.
+        /// If <paramref name="filter"/> is <c>null</c>, the original query is returned unchanged.
+        /// </summary>
+        /// <typeparam name="T">The entity type, constrained to <see cref="IModelBase"/>.</typeparam>
+        /// <param name="query">The source queryable to filter.</param>
+        /// <param name="filter">
+        /// The predicate expression to apply, or <c>null</c> to skip filtering.
+        /// </param>
+        /// <returns>The filtered (or original) queryable.</returns>
+        public static IQueryable<T> Filter<T>(
+            this IQueryable<T> query,
+            Expression<Func<T, bool>> filter)
+            where T : IModelBase
+        {
+            if (filter == null)
+                return query;
+
+            return query.Where(filter);
+        }
+    }
+
+}
diff --git a/src/TailoredApps.Shared.EntityFramework/Querying/QueryPagingExtension.cs b/src/TailoredApps.Shared.EntityFramework/Querying/QueryPagingExtension.cs
index df84ad4..0895d46 100644
--- a/src/TailoredApps.Shared.EntityFramework/Querying/QueryPagingExtension.cs
+++ b/src/TailoredApps.Shared.EntityFramework/Querying/QueryPagingExtension.cs
@@ -1,63 +1,63 @@
-using System;
-using System.Linq;
-using System.Threading.Tasks;
-using TailoredApps.Shared.Querying;
-
-namespace TailoredApps.Shared.EntityFramework.Querying
-{
-    /// <summary>
-    /// Provides extension methods for applying paging to <see cref="IQueryable{T}"/> sequences
-    /// and projecting <see cref="PagedResult{T}"/> instances to a different type.
-    /// </summary>
-    public static class QueryPagingExtension
-    {
-        /// <summary>
-        /// Synchronously applies paging to the query and returns a <see cref="PagedResult{T}"/>.
-        /// </summary>
-        /// <typeparam name="T">The element type of the query.</typeparam>
-        /// <param name="query">The source queryable.</param>
-        /// <param name="paging">The paging parameters specifying page number and page size.</param>
-        /// <returns>A <see cref="PagedResult{T}"/> containing the requested page and total count.</returns>
-        public static PagedResult<T> Paging<T>(this IQueryable<T> query, IPagingParameters paging)
-        {
-            var pagingQuery = new PagingQuery<T>(query, paging).GetPagingQuery();
-
-            return new PagedResult<T>(pagingQuery).GetPagedResult();
-        }
-
-        /// <summary>
-        /// Asynchronously applies paging to the query and returns a <see cref="PagedResult{T}"/>.
-        /// </summary>
-        /// <typeparam name="T">The element type of the query.</typeparam>
-        /// <param name="query">The source queryable.</param>
-        /// <param name="paging">The paging parameters specifying page number and page size.</param>
-        /// <returns>
-        /// A task that resolves to a <see cref="PagedResult{T}"/> containing the requested page and total count.
-        /// </returns>
-        public static async Task<PagedResult<T>> PagingAsync<T>(this IQueryable<T> query, IPagingParameters paging)
-        {
-            var pagingQuery = await new PagingQuery<T>(query, paging).GetPagingQueryAsync();
-            var result = await new PagedResult<T>(pagingQuery).GetPagedResultAsync();
-            return result;
-        }
-
-        /// <summary>
-        /// Projects the items of a <see cref="PagedResult{TSrc}"/> to a new type <typeparamref name="TDst"/>
-        /// using the provided projector function, preserving the total count.
-        /// </summary>
-        /// <typeparam name="TSrc">The source item type.</typeparam>
-        /// <typeparam name="TDst">The destination item type.</typeparam>
-        /// <param name="pagedResult">The source paged result to project.</param>
-        /// <param name="projector">A function that maps each source item to the destination type.</param>
-        /// <returns>A new <see cref="PagedResult{TDst}"/> with projected items and the original count.</returns>
-        public static PagedResult<TDst> Project<TSrc, TDst>(this PagedResult<TSrc> pagedResult, Func<TSrc, TDst> projector)
-        {
-            if (pagedResult == null) throw new ArgumentNullException(nameof(pagedResult));
-            if (projector == null) throw new ArgumentNullException(nameof(projector));
-
-            var destinationModels = pagedResult.Results.Select(projector).ToList();
-
-            return new PagedResult<TDst>(destinationModels, pagedResult.Count);
-        }
-    }
-}
+using System;
+using System.Linq;
+using System.Threading.Tasks;
+using TailoredApps.Shared.Querying;
+
+namespace TailoredApps.Shared.EntityFramework.Querying
+{
+    /// <summary>
+    /// Provides extension methods for applying paging to <see cref="IQueryable{T}"/> sequences
+    /// and projecting <see cref="PagedResult{T}"/> instances to a different type.
+    /// </summary>
+    public static class QueryPagingExtension
+    {
+        /// <summary>
+        /// Synchronously applies paging to the query and returns a <see cref="PagedResult{T}"/>.
+        /// </summary>
+        /// <typeparam name="T">The element type of the query.</typeparam>
+        /// <param name="query">The source queryable.</param>
+        /// <param name="paging">The paging parameters specifying page number and page size.</param>
+        /// <returns>A <see cref="PagedResult{T}"/> containing the requested page and total count.</returns>
+        public static PagedResult<T> Paging<T>(this IQueryable<T> query, IPagingParameters paging)
+        {
+            var pagingQuery = new PagingQuery<T>(query, paging).GetPagingQuery();
+
+            return new PagedResult<T>(pagingQuery).GetPagedResult();
+        }
+
+        /// <summary>
+        /// Asynchronously applies paging to the query and returns a <see cref="PagedResult{T}"/>.
+        /// </summary>
+        /// <typeparam name="T">The element type of the query.</typeparam>
+        /// <param name="query">The source queryable.</param>
+        /// <param name="paging">The paging parameters specifying page number and page size.</param>
+        /// <returns>
+        /// A task that resolves to a <see cref="PagedResult{T}"/> containing the requested page and total count.
+        /// </returns>
+        public static async Task<PagedResult<T>> PagingAsync<T>(this IQueryable<T> query, IPagingParameters paging)
+        {
+            var pagingQuery = await new PagingQuery<T>(query, paging).GetPagingQueryAsync();
+            var result = await new PagedResult<T>(pagingQuery).GetPagedResultAsync();
+            return result;
+        }
+
+        /// <summary>
+        /// Projects the items of a <see cref="PagedResult{TSrc}"/> to a new type <typeparamref name="TDst"/>
+        /// using the provided projector function, preserving the total count.
+        /// </summary>
+        /// <typeparam name="TSrc">The source item type.</typeparam>
+        /// <typeparam name="TDst">The destination item type.</typeparam>
+        /// <param name="pagedResult">The source paged result to project.</param>
+        /// <param name="projector">A function that maps each source item to the destination type.</param>
+        /// <returns>A new <see cref="PagedResult{TDst}"/> with projected items and the original count.</returns>
+        public static PagedResult<TDst> Project<TSrc, TDst>(this PagedResult<TSrc> pagedResult, Func<TSrc, TDst> projector)
+        {
+            if (pagedResult == null) throw new ArgumentNullException(nameof(pagedResult));
+            if (projector == null) throw new ArgumentNullException(nameof(projector));
+
+            var destinationModels = pagedResult.Results.Select(projector).ToList();
+
+            return new PagedResult<TDst>(destinationModels, pagedResult.Count);
+        }
+    }
+}
diff --git a/src/TailoredApps.Shared.EntityFramework/Querying/QuerySortingExtensions.cs b/src/TailoredApps.Shared.EntityFramework/Querying/QuerySortingExtensions.cs
index ac81402..f6f8f55 100644
--- a/src/TailoredApps.Shared.EntityFramework/Querying/QuerySortingExtensions.cs
+++ b/src/TailoredApps.Shared.EntityFramework/Querying/QuerySortingExtensions.cs
@@ -1,78 +1,78 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Linq.Dynamic.Core;
-using TailoredApps.Shared.EntityFramework.Interfaces;
-using TailoredApps.Shared.Querying;
-
-namespace TailoredApps.Shared.EntityFramework.Querying
-{
-    /// <summary>
-    /// Provides extension methods for applying dynamic sorting to <see cref="IQueryable{T}"/> sequences.
-    /// </summary>
-    public static class QuerySortingExtensions
-    {
-        /// <summary>
-        /// Applies a single set of sorting parameters to the query.
-        /// Returns the original query unchanged if <paramref name="sortingParameters"/> is <c>null</c>
-        /// or has no sorting specified.
-        /// </summary>
-        /// <typeparam name="T">The element type of the query.</typeparam>
-        /// <param name="query">The source queryable.</param>
-        /// <param name="sortingParameters">The sorting parameters to apply.</param>
-        /// <returns>The sorted (or original) queryable.</returns>
-        public static IQueryable<T> ApplySorting<T>(
-            this IQueryable<T> query,
-            ISortingParameters sortingParameters)
-        {
-            return sortingParameters?.IsSortingSpecified == true
-                            ? query.OrderBy(GenerateSortQuery(sortingParameters))
-                            : query;
-        }
-
-        /// <summary>
-        /// Applies multiple sets of sorting parameters to the query.
-        /// Returns the original query unchanged if no valid sorting parameters are provided.
-        /// </summary>
-        /// <typeparam name="T">The element type of the query, constrained to <see cref="IModelBase"/>.</typeparam>
-        /// <param name="query">The source queryable.</param>
-        /// <param name="sortingParameters">The collection of sorting parameters to apply in order.</param>
-        /// <returns>The sorted (or original) queryable.</returns>
-        public static IQueryable<T> ApplySorting<T>(
-            this IQueryable<T> query,
-            IEnumerable<ISortingParameters> sortingParameters)
-            where T : IModelBase
-        {
-            var parametersSnapshot = sortingParameters?.Where(x => x.IsSortingSpecified)
-                                                      .ToList() ?? Enumerable.Empty<ISortingParameters>().ToList();
-
-            return parametersSnapshot.Count > 0
-                        ? query.OrderBy(GenerateSortQuery(parametersSnapshot))
-                        : query;
-        }
-
-        /// <summary>
-        /// Applies an optional decorator function to the query (e.g. for custom <c>Include</c> or <c>Where</c> clauses).
-        /// Returns the original query unchanged if <paramref name="decorator"/> is <c>null</c>.
-        /// </summary>
-        /// <typeparam name="T">The element type of the query.</typeparam>
-        /// <param name="query">The source queryable.</param>
-        /// <param name="decorator">An optional function that transforms the query.</param>
-        /// <returns>The decorated (or original) queryable.</returns>
-        public static IQueryable<T> AdditionOperation<T>(this IQueryable<T> query,
-                                                         Func<IQueryable<T>, IQueryable<T>> decorator)
-            => decorator?.Invoke(query) ?? query;
-
-        private static string GenerateSortQuery(IEnumerable<ISortingParameters> parameters)
-        {
-            return string.Join(",", parameters.Where(x => x.IsSortingSpecified)
-                .Select(GenerateSortQuery));
-        }
-
-        private static string GenerateSortQuery(ISortingParameters sortingParameter)
-            => sortingParameter.SortDir == SortDirection.Desc
-                ? $"{sortingParameter.SortField} {SortDirection.Desc}"
-                : sortingParameter.SortField;
-
-    }
-}
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Linq.Dynamic.Core;
+using TailoredApps.Shared.EntityFramework.Interfaces;
+using TailoredApps.Shared.Querying;
+
+namespace TailoredApps.Shared.EntityFramework.Querying
+{
+    /// <summary>
+    /// Provides extension methods for applying dynamic sorting to <see cref="IQueryable{T}"/> sequences.
+    /// </summary>
+    public static class QuerySortingExtensions
+    {
+        /// <summary>
+        /// Applies a single set of sorting parameters to the query.
+        /// Returns the original query unchanged if <paramref name="sortingParameters"/> is <c>null</c>
+        /// or has no sorting specified.
+        /// </summary>
+        /// <typeparam name="T">The element type of the query.</typeparam>
+        /// <param name="query">The source queryable.</param>
+        /// <param name="sortingParameters">The sorting parameters to apply.</param>
+        /// <returns>The sorted (or original) queryable.</returns>
+        public static IQueryable<T> ApplySorting<T>(
+            this IQueryable<T> query,
+            ISortingParameters sortingParameters)
+        {
+            return sortingParameters?.IsSortingSpecified == true
+                            ? query.OrderBy(GenerateSortQuery(sortingParameters))
+                            : query;
+        }
+
+        /// <summary>
+        /// Applies multiple sets of sorting parameters to the query.
+        /// Returns the original query unchanged if no valid sorting parameters are provided.
+        /// </summary>
+        /// <typeparam name="T">The element type of the query, constrained to <see cref="IModelBase"/>.</typeparam>
+        /// <param name="query">The source queryable.</param>
+        /// <param name="sortingParameters">The collection of sorting parameters to apply in order.</param>
+        /// <returns>The sorted (or original) queryable.</returns>
+        public static IQueryable<T> ApplySorting<T>(
+            this IQueryable<T> query,
+            IEnumerable<ISortingParameters> sortingParameters)
+            where T : IModelBase
+        {
+            var parametersSnapshot = sortingParameters?.Where(x => x.IsSortingSpecified)
+                                                      .ToList() ?? Enumerable.Empty<ISortingParameters>().ToList();
+
+            return parametersSnapshot.Count > 0
+                        ? query.OrderBy(GenerateSortQuery(parametersSnapshot))
+                        : query;
+        }
+
+        /// <summary>
+        /// Applies an optional decorator function to the query (e.g. for custom <c>Include</c> or <c>Where</c> clauses).
+        /// Returns the original query unchanged if <paramref name="decorator"/> is <c>null</c>.
+        /// </summary>
+        /// <typeparam name="T">The element type of the query.</typeparam>
+        /// <param name="query">The source queryable.</param>
+        /// <param name="decorator">An optional function that transforms the query.</param>
+        /// <returns>The decorated (or original) queryable.</returns>
+        public static IQueryable<T> AdditionOperation<T>(this IQueryable<T> query,
+                                                         Func<IQueryable<T>, IQueryable<T>> decorator)
+            => decorator?.Invoke(query) ?? query;
+
+        private static string GenerateSortQuery(IEnumerable<ISortingParameters> parameters)
+        {
+            return string.Join(",", parameters.Where(x => x.IsSortingSpecified)
+                .Select(GenerateSortQuery));
+        }
+
+        private static string GenerateSortQuery(ISortingParameters sortingParameter)
+            => sortingParameter.SortDir == SortDirection.Desc
+                ? $"{sortingParameter.SortField} {SortDirection.Desc}"
+                : sortingParameter.SortField;
+
+    }
+}
diff --git a/src/TailoredApps.Shared.EntityFramework/UnitOfWork/Audit/Changes/AuditChangesCollector.cs b/src/TailoredApps.Shared.EntityFramework/UnitOfWork/Audit/Changes/AuditChangesCollector.cs
index 67ab4f4..b09fa6b 100644
--- a/src/TailoredApps.Shared.EntityFramework/UnitOfWork/Audit/Changes/AuditChangesCollector.cs
+++ b/src/TailoredApps.Shared.EntityFramework/UnitOfWork/Audit/Changes/AuditChangesCollector.cs
@@ -1,7 +1,7 @@
-using Microsoft.EntityFrameworkCore;
 using System;
 using System.Collections.Generic;
 using System.Linq;
+using Microsoft.EntityFrameworkCore;
 using TailoredApps.Shared.EntityFramework.Interfaces.Audit;
 using TailoredApps.Shared.EntityFramework.UnitOfWork.Audit.Extensions;
 
@@ -38,4 +38,4 @@ public IEnumerable<IAuditEntityEntry> CollectChanges()
                 .ToList();
         }
     }
-}
\ No newline at end of file
+}
diff --git a/src/TailoredApps.Shared.EntityFramework/UnitOfWork/Audit/Changes/AuditEntityEntry.cs b/src/TailoredApps.Shared.EntityFramework/UnitOfWork/Audit/Changes/AuditEntityEntry.cs
index 374ef8a..cd7565c 100644
--- a/src/TailoredApps.Shared.EntityFramework/UnitOfWork/Audit/Changes/AuditEntityEntry.cs
+++ b/src/TailoredApps.Shared.EntityFramework/UnitOfWork/Audit/Changes/AuditEntityEntry.cs
@@ -1,32 +1,71 @@
-using Microsoft.EntityFrameworkCore.ChangeTracking;
 using System;
 using System.Collections.Generic;
 using System.Linq;
+using Microsoft.EntityFrameworkCore.ChangeTracking;
 using TailoredApps.Shared.EntityFramework.Interfaces.Audit;
 using TailoredApps.Shared.EntityFramework.UnitOfWork.Audit.Extensions;
 
 namespace TailoredApps.Shared.EntityFramework.UnitOfWork.Audit.Changes
 {
+    /// <summary>
+    /// Represents the audit snapshot of a tracked entity entry captured at save time.
+    /// Provides access to the entity's current/original state, type, primary keys,
+    /// and the audit-specific entity state.
+    /// </summary>
     internal interface IAuditEntityEntry
     {
+        /// <summary>
+        /// Gets the audit-specific state of the entity (e.g. Added, Modified, Deleted).
+        /// </summary>
         AuditEntityState EntityState { get; }
 
+        /// <summary>
+        /// Gets the entity object with its current (post-change) property values.
+        /// </summary>
         object CurrentEntity { get; }
 
+        /// <summary>
+        /// Gets the entity object with its original (pre-change) property values.
+        /// </summary>
         object OriginalEntity { get; }
 
+        /// <summary>
+        /// Gets the CLR type of the tracked entity.
+        /// </summary>
         Type EntityType { get; }
 
+        /// <summary>
+        /// Returns a string identifier built from the entity type name and its primary key values.
+        /// </summary>
         string GetPrimaryKeyStringIdentifier();
+
+        /// <summary>
+        /// Returns a dictionary mapping primary key property names to their current values.
+        /// </summary>
         Dictionary<string, object> GetPrimaryKeys();
 
+        /// <summary>
+        /// Copies primary key values from the EF Core tracked entity into both
+        /// <see cref="CurrentEntity"/> and <see cref="OriginalEntity"/> snapshots.
+        /// </summary>
         void SetPrimaryKeys();
     }
 
+    /// <summary>
+    /// Default implementation of <see cref="IAuditEntityEntry"/> that wraps an EF Core
+    /// <see cref="EntityEntry"/> and snapshots its current and original values at construction time.
+    /// </summary>
     internal class AuditEntityEntry : IAuditEntityEntry
     {
         private readonly EntityEntry _entityEntry;
 
+        /// <summary>
+        /// Initializes a new instance of <see cref="AuditEntityEntry"/> from an EF Core entity entry.
+        /// Snapshots <see cref="CurrentEntity"/>, <see cref="OriginalEntity"/>, <see cref="EntityType"/>,
+        /// and <see cref="EntityState"/> at the time of construction.
+        /// </summary>
+        /// <param name="entityEntry">The EF Core change-tracker entry to wrap. Must not be <c>null</c>.</param>
+        /// <exception cref="ArgumentNullException">Thrown when <paramref name="entityEntry"/> is <c>null</c>.</exception>
         public AuditEntityEntry(EntityEntry entityEntry)
         {
             _entityEntry = entityEntry ?? throw new ArgumentNullException(nameof(entityEntry));
@@ -36,17 +75,27 @@ public AuditEntityEntry(EntityEntry entityEntry)
             EntityState = entityEntry.State.ToAuditEntityState();
         }
 
+        /// <summary>
+        /// Creates a new <see cref="IAuditEntityEntry"/> from the given EF Core entity entry.
+        /// </summary>
+        /// <param name="entityEntry">The EF Core change-tracker entry to wrap.</param>
+        /// <returns>A new <see cref="IAuditEntityEntry"/> instance.</returns>
         public static IAuditEntityEntry Create(EntityEntry entityEntry)
             => new AuditEntityEntry(entityEntry);
 
+        /// <inheritdoc/>
         public AuditEntityState EntityState { get; }
 
+        /// <inheritdoc/>
         public object CurrentEntity { get; }
 
+        /// <inheritdoc/>
         public object OriginalEntity { get; }
 
+        /// <inheritdoc/>
         public Type EntityType { get; }
 
+        /// <inheritdoc/>
         public string GetPrimaryKeyStringIdentifier()
         {
             var primaryKeyValues = _entityEntry.Metadata.FindPrimaryKey()
@@ -55,6 +104,8 @@ public string GetPrimaryKeyStringIdentifier()
 
             return $"{EntityType.Name}_{string.Join("_", primaryKeyValues)}";
         }
+
+        /// <inheritdoc/>
         public Dictionary<string, object> GetPrimaryKeys()
         {
             var primaryKey = _entityEntry.Metadata.FindPrimaryKey();
@@ -64,6 +115,7 @@ public Dictionary<string, object> GetPrimaryKeys()
             return keys;
         }
 
+        /// <inheritdoc/>
         public void SetPrimaryKeys()
         {
             var primaryKeyProperties = _entityEntry.Metadata.FindPrimaryKey().Properties;
@@ -77,4 +129,4 @@ public void SetPrimaryKeys()
             }
         }
     }
-}
\ No newline at end of file
+}
diff --git a/src/TailoredApps.Shared.EntityFramework/UnitOfWork/Audit/Changes/EntityChangeUpdateContext.cs b/src/TailoredApps.Shared.EntityFramework/UnitOfWork/Audit/Changes/EntityChangeUpdateContext.cs
index b0925dc..44b37af 100644
--- a/src/TailoredApps.Shared.EntityFramework/UnitOfWork/Audit/Changes/EntityChangeUpdateContext.cs
+++ b/src/TailoredApps.Shared.EntityFramework/UnitOfWork/Audit/Changes/EntityChangeUpdateContext.cs
@@ -1,10 +1,30 @@
-using System;
+using System;
 using System.Collections.Generic;
 
 namespace TailoredApps.Shared.EntityFramework.UnitOfWork.Audit.Changes
 {
+    /// <summary>
+    /// Carries all data required by an entity-change update operation:
+    /// the full changes dictionary, the identifier of the entity being updated,
+    /// the newly collected change, and the existing change record that will be mutated.
+    /// </summary>
     internal class EntityChangeUpdateContext : IEntityChangeUpdateContext
     {
+        /// <summary>
+        /// Initializes a new instance of <see cref="EntityChangeUpdateContext"/>.
+        /// </summary>
+        /// <param name="entityChangesDictionary">
+        /// The mutable dictionary that maps entity identifiers to their accumulated change records.
+        /// Must not be <c>null</c> and must already contain an entry for <paramref name="identifier"/>.
+        /// </param>
+        /// <param name="collectedEntityChange">The newly captured change to merge into the existing record.</param>
+        /// <param name="identifier">The string key that uniquely identifies the entity within the dictionary.</param>
+        /// <exception cref="ArgumentNullException">
+        /// Thrown when any of the required arguments is <c>null</c>.
+        /// </exception>
+        /// <exception cref="InvalidOperationException">
+        /// Thrown when <paramref name="entityChangesDictionary"/> does not contain <paramref name="identifier"/>.
+        /// </exception>
         public EntityChangeUpdateContext(IDictionary<string, IInternalEntityChange> entityChangesDictionary,
             IInternalEntityChange collectedEntityChange, string identifier)
         {
@@ -18,17 +38,43 @@ public EntityChangeUpdateContext(IDictionary<string, IInternalEntityChange> enti
             ExistingEntityChange = existingEntityChange;
         }
 
+        /// <inheritdoc/>
         public IDictionary<string, IInternalEntityChange> EntityChangesDictionary { get; }
+
+        /// <inheritdoc/>
         public string Identifier { get; }
+
+        /// <inheritdoc/>
         public IInternalEntityChange CollectedEntityChange { get; }
+
+        /// <inheritdoc/>
         public IInternalEntityChange ExistingEntityChange { get; }
     }
 
+    /// <summary>
+    /// Defines the data contract for an entity-change update context used by
+    /// <see cref="EntityChangeUpdateOperationFactory"/> to resolve and execute the correct merge strategy.
+    /// </summary>
     internal interface IEntityChangeUpdateContext
     {
+        /// <summary>
+        /// Gets the dictionary of accumulated entity change records, keyed by entity identifier.
+        /// </summary>
         IDictionary<string, IInternalEntityChange> EntityChangesDictionary { get; }
+
+        /// <summary>
+        /// Gets the string identifier that uniquely identifies the entity within <see cref="EntityChangesDictionary"/>.
+        /// </summary>
         string Identifier { get; }
+
+        /// <summary>
+        /// Gets the newly collected entity change that should be merged into <see cref="ExistingEntityChange"/>.
+        /// </summary>
         IInternalEntityChange CollectedEntityChange { get; }
+
+        /// <summary>
+        /// Gets the existing entity change record stored in <see cref="EntityChangesDictionary"/> that will be updated.
+        /// </summary>
         IInternalEntityChange ExistingEntityChange { get; }
     }
-}
\ No newline at end of file
+}
diff --git a/src/TailoredApps.Shared.EntityFramework/UnitOfWork/Audit/Changes/EntityChangeUpdateOperationFactory.cs b/src/TailoredApps.Shared.EntityFramework/UnitOfWork/Audit/Changes/EntityChangeUpdateOperationFactory.cs
index d55a3df..0dab8e9 100644
--- a/src/TailoredApps.Shared.EntityFramework/UnitOfWork/Audit/Changes/EntityChangeUpdateOperationFactory.cs
+++ b/src/TailoredApps.Shared.EntityFramework/UnitOfWork/Audit/Changes/EntityChangeUpdateOperationFactory.cs
@@ -1,9 +1,15 @@
-using System;
+using System;
 using System.Collections.Generic;
 using TailoredApps.Shared.EntityFramework.Interfaces.Audit;
 
 namespace TailoredApps.Shared.EntityFramework.UnitOfWork.Audit.Changes
 {
+    /// <summary>
+    /// Factory that maps an <see cref="EntityStateTransition"/> to the appropriate
+    /// entity-change update operation. Each operation defines how an existing audit record
+    /// should be mutated when an entity transitions between two <see cref="AuditEntityState"/> values
+    /// within the same transaction.
+    /// </summary>
     internal static class EntityChangeUpdateOperationFactory
     {
         private static readonly IDictionary<EntityStateTransition, Action<IEntityChangeUpdateContext>> UpdateOperations =
@@ -55,6 +61,19 @@ internal static class EntityChangeUpdateOperationFactory
                 },
             };
 
+        /// <summary>
+        /// Returns the update operation delegate for the given <see cref="EntityStateTransition"/>.
+        /// </summary>
+        /// <param name="entityStateTransition">
+        /// The transition describing the previous and new audit state of the entity.
+        /// </param>
+        /// <returns>
+        /// An <see cref="Action{IEntityChangeUpdateContext}"/> that applies the correct merge
+        /// strategy to the existing audit change record.
+        /// </returns>
+        /// <exception cref="InvalidOperationException">
+        /// Thrown when no operation is registered for the supplied <paramref name="entityStateTransition"/>.
+        /// </exception>
         public static Action<IEntityChangeUpdateContext> Create(EntityStateTransition entityStateTransition)
         {
             if (UpdateOperations.TryGetValue(entityStateTransition, out var updateOperation))
@@ -63,4 +82,4 @@ public static Action<IEntityChangeUpdateContext> Create(EntityStateTransition en
                 throw new InvalidOperationException("Unexpected entity state transition within current transaction.");
         }
     }
-}
\ No newline at end of file
+}
diff --git a/src/TailoredApps.Shared.EntityFramework/UnitOfWork/Audit/Changes/EntityStateTransition.cs b/src/TailoredApps.Shared.EntityFramework/UnitOfWork/Audit/Changes/EntityStateTransition.cs
index 34b6542..12c64e7 100644
--- a/src/TailoredApps.Shared.EntityFramework/UnitOfWork/Audit/Changes/EntityStateTransition.cs
+++ b/src/TailoredApps.Shared.EntityFramework/UnitOfWork/Audit/Changes/EntityStateTransition.cs
@@ -1,4 +1,4 @@
-using TailoredApps.Shared.EntityFramework.Interfaces.Audit;
+using TailoredApps.Shared.EntityFramework.Interfaces.Audit;
 
 namespace TailoredApps.Shared.EntityFramework.UnitOfWork.Audit.Changes
 {
@@ -33,4 +33,4 @@ public override bool Equals(object obj)
             return From == otherStateTransition.From && To == otherStateTransition.To;
         }
     }
-}
\ No newline at end of file
+}
diff --git a/src/TailoredApps.Shared.EntityFramework/UnitOfWork/Audit/Changes/InternalEntityChange.cs b/src/TailoredApps.Shared.EntityFramework/UnitOfWork/Audit/Changes/InternalEntityChange.cs
index ee7a52c..977a6d1 100644
--- a/src/TailoredApps.Shared.EntityFramework/UnitOfWork/Audit/Changes/InternalEntityChange.cs
+++ b/src/TailoredApps.Shared.EntityFramework/UnitOfWork/Audit/Changes/InternalEntityChange.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using TailoredApps.Shared.EntityFramework.Interfaces.Audit;
 
@@ -39,4 +39,4 @@ public object GetOriginalEntity()
         public AuditEntityState GetAuditEntityState()
             => State;
     }
-}
\ No newline at end of file
+}
diff --git a/src/TailoredApps.Shared.EntityFramework/UnitOfWork/Audit/Configuration/AuditSettings.cs b/src/TailoredApps.Shared.EntityFramework/UnitOfWork/Audit/Configuration/AuditSettings.cs
index 8ab7a04..56d6333 100644
--- a/src/TailoredApps.Shared.EntityFramework/UnitOfWork/Audit/Configuration/AuditSettings.cs
+++ b/src/TailoredApps.Shared.EntityFramework/UnitOfWork/Audit/Configuration/AuditSettings.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using TailoredApps.Shared.EntityFramework.Interfaces.Audit;
@@ -10,4 +10,4 @@ internal sealed class AuditSettings : IAuditSettings
         public IEnumerable<Type> TypesToCollect { get; set; } = Enumerable.Empty<Type>();
         public IEnumerable<AuditEntityState> EntityStatesToCollect { get; set; } = Enumerable.Empty<AuditEntityState>();
     }
-}
\ No newline at end of file
+}
diff --git a/src/TailoredApps.Shared.EntityFramework/UnitOfWork/Audit/Configuration/UnitOfWorkOptionsBuilderExtensions.cs b/src/TailoredApps.Shared.EntityFramework/UnitOfWork/Audit/Configuration/UnitOfWorkOptionsBuilderExtensions.cs
index 270f4a4..ea8b089 100644
--- a/src/TailoredApps.Shared.EntityFramework/UnitOfWork/Audit/Configuration/UnitOfWorkOptionsBuilderExtensions.cs
+++ b/src/TailoredApps.Shared.EntityFramework/UnitOfWork/Audit/Configuration/UnitOfWorkOptionsBuilderExtensions.cs
@@ -1,67 +1,67 @@
-using Microsoft.EntityFrameworkCore;
-using Microsoft.Extensions.DependencyInjection;
-using System;
-using System.Linq;
-using TailoredApps.Shared.EntityFramework.Interfaces.Audit;
-using TailoredApps.Shared.EntityFramework.Interfaces.UnitOfWork;
-using TailoredApps.Shared.EntityFramework.UnitOfWork.Audit.Changes;
-using TailoredApps.Shared.EntityFramework.UnitOfWork.Audit.Exceptions;
-using TailoredApps.Shared.EntityFramework.UnitOfWork.Audit.Hooks;
-
-namespace TailoredApps.Shared.EntityFramework.UnitOfWork.Audit.Configuration
-{
-    /// <summary>
-    /// Provides extension methods on <see cref="IUnitOfWorkOptionsBuilder"/> for enabling
-    /// the Unit of Work audit feature.
-    /// </summary>
-    public static class UnitOfWorkOptionsBuilderExtensions
-    {
-        /// <summary>
-        /// Enables the Unit of Work audit mechanism, registering all required services and lifecycle hooks.
-        /// </summary>
-        /// <typeparam name="TTargetDbContext">
-        /// The EF Core <see cref="DbContext"/> type to monitor for changes.
-        /// </typeparam>
-        /// <typeparam name="TEntityChangesAuditor">
-        /// The <see cref="IEntityChangesAuditor"/> implementation that processes collected changes.
-        /// </typeparam>
-        /// <param name="options">The Unit of Work options builder to extend.</param>
-        /// <param name="config">A configuration delegate used to set <see cref="IAuditSettings"/>.</param>
-        /// <returns>The options builder for further chaining.</returns>
-        /// <exception cref="ArgumentNullException">Thrown when <paramref name="config"/> is <c>null</c>.</exception>
-        /// <exception cref="InvalidAuditConfigurationException">
-        /// Thrown when the provided settings are missing required values.
-        /// </exception>
-        public static IUnitOfWorkOptionsBuilder WithUnitOfWorkAudit<TTargetDbContext, TEntityChangesAuditor>(this IUnitOfWorkOptionsBuilder options, Action<IAuditSettings> config)
-            where TTargetDbContext : DbContext
-            where TEntityChangesAuditor : class, IEntityChangesAuditor
-        {
-            if (config == null) throw new ArgumentNullException(nameof(config));
-
-            var auditSettings = new AuditSettings();
-            config(auditSettings);
-            ValidateSettings(auditSettings);
-
-            options.Services.AddScoped<IUnitOfWorkAuditContext, UnitOfWorkAuditContext>();
-            options.Services.AddSingleton<IAuditSettings>(auditSettings);
-            options.Services.AddTransient<IEntityChangesAuditor, TEntityChangesAuditor>();
-            options.Services.AddTransient<IAuditChangesCollector, AuditChangesCollector<TTargetDbContext>>();
-
-            options.WithPostSaveChangesHook<PostSaveChangesAuditHook>()
-                .WithPreSaveChangesHook<PreSaveChangesAuditHook>()
-                .WithTransactionRollbackHook<TransactionRollbackAuditHook>()
-                .WithTransactionCommitHook<TransactionCommitAuditHook>();
-
-            return options;
-        }
-
-        private static void ValidateSettings(IAuditSettings auditSettings)
-        {
-            if (!auditSettings.TypesToCollect.Any())
-                throw new InvalidAuditConfigurationException(nameof(auditSettings.TypesToCollect));
-
-            if (!auditSettings.EntityStatesToCollect.Any())
-                throw new InvalidAuditConfigurationException(nameof(auditSettings.EntityStatesToCollect));
-        }
-    }
-}
+using System;
+using System.Linq;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.Extensions.DependencyInjection;
+using TailoredApps.Shared.EntityFramework.Interfaces.Audit;
+using TailoredApps.Shared.EntityFramework.Interfaces.UnitOfWork;
+using TailoredApps.Shared.EntityFramework.UnitOfWork.Audit.Changes;
+using TailoredApps.Shared.EntityFramework.UnitOfWork.Audit.Exceptions;
+using TailoredApps.Shared.EntityFramework.UnitOfWork.Audit.Hooks;
+
+namespace TailoredApps.Shared.EntityFramework.UnitOfWork.Audit.Configuration
+{
+    /// <summary>
+    /// Provides extension methods on <see cref="IUnitOfWorkOptionsBuilder"/> for enabling
+    /// the Unit of Work audit feature.
+    /// </summary>
+    public static class UnitOfWorkOptionsBuilderExtensions
+    {
+        /// <summary>
+        /// Enables the Unit of Work audit mechanism, registering all required services and lifecycle hooks.
+        /// </summary>
+        /// <typeparam name="TTargetDbContext">
+        /// The EF Core <see cref="DbContext"/> type to monitor for changes.
+        /// </typeparam>
+        /// <typeparam name="TEntityChangesAuditor">
+        /// The <see cref="IEntityChangesAuditor"/> implementation that processes collected changes.
+        /// </typeparam>
+        /// <param name="options">The Unit of Work options builder to extend.</param>
+        /// <param name="config">A configuration delegate used to set <see cref="IAuditSettings"/>.</param>
+        /// <returns>The options builder for further chaining.</returns>
+        /// <exception cref="ArgumentNullException">Thrown when <paramref name="config"/> is <c>null</c>.</exception>
+        /// <exception cref="InvalidAuditConfigurationException">
+        /// Thrown when the provided settings are missing required values.
+        /// </exception>
+        public static IUnitOfWorkOptionsBuilder WithUnitOfWorkAudit<TTargetDbContext, TEntityChangesAuditor>(this IUnitOfWorkOptionsBuilder options, Action<IAuditSettings> config)
+            where TTargetDbContext : DbContext
+            where TEntityChangesAuditor : class, IEntityChangesAuditor
+        {
+            if (config == null) throw new ArgumentNullException(nameof(config));
+
+            var auditSettings = new AuditSettings();
+            config(auditSettings);
+            ValidateSettings(auditSettings);
+
+            options.Services.AddScoped<IUnitOfWorkAuditContext, UnitOfWorkAuditContext>();
+            options.Services.AddSingleton<IAuditSettings>(auditSettings);
+            options.Services.AddTransient<IEntityChangesAuditor, TEntityChangesAuditor>();
+            options.Services.AddTransient<IAuditChangesCollector, AuditChangesCollector<TTargetDbContext>>();
+
+            options.WithPostSaveChangesHook<PostSaveChangesAuditHook>()
+                .WithPreSaveChangesHook<PreSaveChangesAuditHook>()
+                .WithTransactionRollbackHook<TransactionRollbackAuditHook>()
+                .WithTransactionCommitHook<TransactionCommitAuditHook>();
+
+            return options;
+        }
+
+        private static void ValidateSettings(IAuditSettings auditSettings)
+        {
+            if (!auditSettings.TypesToCollect.Any())
+                throw new InvalidAuditConfigurationException(nameof(auditSettings.TypesToCollect));
+
+            if (!auditSettings.EntityStatesToCollect.Any())
+                throw new InvalidAuditConfigurationException(nameof(auditSettings.EntityStatesToCollect));
+        }
+    }
+}
diff --git a/src/TailoredApps.Shared.EntityFramework/UnitOfWork/Audit/Exceptions/InvalidAuditConfigurationException.cs b/src/TailoredApps.Shared.EntityFramework/UnitOfWork/Audit/Exceptions/InvalidAuditConfigurationException.cs
index b66dd7f..552c4f2 100644
--- a/src/TailoredApps.Shared.EntityFramework/UnitOfWork/Audit/Exceptions/InvalidAuditConfigurationException.cs
+++ b/src/TailoredApps.Shared.EntityFramework/UnitOfWork/Audit/Exceptions/InvalidAuditConfigurationException.cs
@@ -1,22 +1,22 @@
-using System;
-
-namespace TailoredApps.Shared.EntityFramework.UnitOfWork.Audit.Exceptions
-{
-    /// <summary>
-    /// Exception thrown when the Unit of Work audit configuration is incomplete or invalid,
-    /// e.g. when required properties such as types to collect or entity states are not specified.
-    /// </summary>
-    [Serializable]
-    public class InvalidAuditConfigurationException : Exception
-    {
-        /// <summary>
-        /// Initializes a new instance of <see cref="InvalidAuditConfigurationException"/>
-        /// for the specified missing or invalid configuration property.
-        /// </summary>
-        /// <param name="propertyName">The name of the misconfigured property.</param>
-        public InvalidAuditConfigurationException(string propertyName)
-            : base($"Invalid settings for Unit Of Work Audit, missing '${propertyName}` configuration.")
-        {
-        }
-    }
-}
+using System;
+
+namespace TailoredApps.Shared.EntityFramework.UnitOfWork.Audit.Exceptions
+{
+    /// <summary>
+    /// Exception thrown when the Unit of Work audit configuration is incomplete or invalid,
+    /// e.g. when required properties such as types to collect or entity states are not specified.
+    /// </summary>
+    [Serializable]
+    public class InvalidAuditConfigurationException : Exception
+    {
+        /// <summary>
+        /// Initializes a new instance of <see cref="InvalidAuditConfigurationException"/>
+        /// for the specified missing or invalid configuration property.
+        /// </summary>
+        /// <param name="propertyName">The name of the misconfigured property.</param>
+        public InvalidAuditConfigurationException(string propertyName)
+            : base($"Invalid settings for Unit Of Work Audit, missing '${propertyName}` configuration.")
+        {
+        }
+    }
+}
diff --git a/src/TailoredApps.Shared.EntityFramework/UnitOfWork/Audit/Extensions/AuditEntityEntryExtensions.cs b/src/TailoredApps.Shared.EntityFramework/UnitOfWork/Audit/Extensions/AuditEntityEntryExtensions.cs
index d83916b..8ccf4ae 100644
--- a/src/TailoredApps.Shared.EntityFramework/UnitOfWork/Audit/Extensions/AuditEntityEntryExtensions.cs
+++ b/src/TailoredApps.Shared.EntityFramework/UnitOfWork/Audit/Extensions/AuditEntityEntryExtensions.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using TailoredApps.Shared.EntityFramework.UnitOfWork.Audit.Changes;
 
 namespace TailoredApps.Shared.EntityFramework.UnitOfWork.Audit.Extensions
@@ -21,4 +21,4 @@ public static IInternalEntityChange CreateInternalEntityChange(this IAuditEntity
 
         }
     }
-}
\ No newline at end of file
+}
diff --git a/src/TailoredApps.Shared.EntityFramework/UnitOfWork/Audit/Extensions/EntityStateExtensions.cs b/src/TailoredApps.Shared.EntityFramework/UnitOfWork/Audit/Extensions/EntityStateExtensions.cs
index e368526..a6cab46 100644
--- a/src/TailoredApps.Shared.EntityFramework/UnitOfWork/Audit/Extensions/EntityStateExtensions.cs
+++ b/src/TailoredApps.Shared.EntityFramework/UnitOfWork/Audit/Extensions/EntityStateExtensions.cs
@@ -1,47 +1,47 @@
-using Microsoft.EntityFrameworkCore;
-using System;
-using TailoredApps.Shared.EntityFramework.Interfaces.Audit;
-
-namespace TailoredApps.Shared.EntityFramework.UnitOfWork.Audit.Extensions
-{
-    /// <summary>
-    /// Provides extension methods for converting between EF Core's <see cref="EntityState"/>
-    /// and the audit-specific <see cref="AuditEntityState"/> enum.
-    /// </summary>
-    public static class EntityStateExtensions
-    {
-        /// <summary>
-        /// Converts an EF Core <see cref="EntityState"/> to the corresponding <see cref="AuditEntityState"/>.
-        /// </summary>
-        /// <param name="enumValue">The EF Core entity state to convert.</param>
-        /// <returns>The matching <see cref="AuditEntityState"/> value.</returns>
-        /// <exception cref="InvalidCastException">
-        /// Thrown when the EF Core state has no matching value in <see cref="AuditEntityState"/>.
-        /// </exception>
-        public static AuditEntityState ToAuditEntityState(this EntityState enumValue)
-        {
-            if (!Enum.TryParse(enumValue.ToString(), true, out AuditEntityState resultingEnum))
-                throw new InvalidCastException($"Unable to parse 'Microsoft.EntityFrameworkCore.EntityState.{enumValue.ToString()}` as enum '{typeof(AuditEntityState).FullName}'."
-                                               + " Make sure that it has been defined in enum definition.");
-
-            return resultingEnum;
-        }
-
-        /// <summary>
-        /// Converts an <see cref="AuditEntityState"/> back to the corresponding EF Core <see cref="EntityState"/>.
-        /// </summary>
-        /// <param name="enumValue">The audit entity state to convert.</param>
-        /// <returns>The matching EF Core <see cref="EntityState"/> value.</returns>
-        /// <exception cref="InvalidCastException">
-        /// Thrown when the audit state has no matching value in <see cref="EntityState"/>.
-        /// </exception>
-        public static EntityState ToEfCoreEntityState(this AuditEntityState enumValue)
-        {
-            if (!Enum.TryParse(enumValue.ToString(), true, out EntityState resultingEnum))
-                throw new InvalidCastException($"Unable to parse 'BC.UnitOfWork.Audit.Abstractions.AuditEntityState.{enumValue.ToString()}` as enum '{typeof(EntityState).FullName}'."
-                                               + " Make sure that it has been defined in enum definition.");
-
-            return resultingEnum;
-        }
-    }
-}
+using System;
+using Microsoft.EntityFrameworkCore;
+using TailoredApps.Shared.EntityFramework.Interfaces.Audit;
+
+namespace TailoredApps.Shared.EntityFramework.UnitOfWork.Audit.Extensions
+{
+    /// <summary>
+    /// Provides extension methods for converting between EF Core's <see cref="EntityState"/>
+    /// and the audit-specific <see cref="AuditEntityState"/> enum.
+    /// </summary>
+    public static class EntityStateExtensions
+    {
+        /// <summary>
+        /// Converts an EF Core <see cref="EntityState"/> to the corresponding <see cref="AuditEntityState"/>.
+        /// </summary>
+        /// <param name="enumValue">The EF Core entity state to convert.</param>
+        /// <returns>The matching <see cref="AuditEntityState"/> value.</returns>
+        /// <exception cref="InvalidCastException">
+        /// Thrown when the EF Core state has no matching value in <see cref="AuditEntityState"/>.
+        /// </exception>
+        public static AuditEntityState ToAuditEntityState(this EntityState enumValue)
+        {
+            if (!Enum.TryParse(enumValue.ToString(), true, out AuditEntityState resultingEnum))
+                throw new InvalidCastException($"Unable to parse 'Microsoft.EntityFrameworkCore.EntityState.{enumValue.ToString()}` as enum '{typeof(AuditEntityState).FullName}'."
+                                               + " Make sure that it has been defined in enum definition.");
+
+            return resultingEnum;
+        }
+
+        /// <summary>
+        /// Converts an <see cref="AuditEntityState"/> back to the corresponding EF Core <see cref="EntityState"/>.
+        /// </summary>
+        /// <param name="enumValue">The audit entity state to convert.</param>
+        /// <returns>The matching EF Core <see cref="EntityState"/> value.</returns>
+        /// <exception cref="InvalidCastException">
+        /// Thrown when the audit state has no matching value in <see cref="EntityState"/>.
+        /// </exception>
+        public static EntityState ToEfCoreEntityState(this AuditEntityState enumValue)
+        {
+            if (!Enum.TryParse(enumValue.ToString(), true, out EntityState resultingEnum))
+                throw new InvalidCastException($"Unable to parse 'BC.UnitOfWork.Audit.Abstractions.AuditEntityState.{enumValue.ToString()}` as enum '{typeof(EntityState).FullName}'."
+                                               + " Make sure that it has been defined in enum definition.");
+
+            return resultingEnum;
+        }
+    }
+}
diff --git a/src/TailoredApps.Shared.EntityFramework/UnitOfWork/Audit/Hooks/PostSaveChangesAuditHook.cs b/src/TailoredApps.Shared.EntityFramework/UnitOfWork/Audit/Hooks/PostSaveChangesAuditHook.cs
index 1449e24..4469163 100644
--- a/src/TailoredApps.Shared.EntityFramework/UnitOfWork/Audit/Hooks/PostSaveChangesAuditHook.cs
+++ b/src/TailoredApps.Shared.EntityFramework/UnitOfWork/Audit/Hooks/PostSaveChangesAuditHook.cs
@@ -1,4 +1,4 @@
-using TailoredApps.Shared.EntityFramework.Interfaces.Audit;
+using TailoredApps.Shared.EntityFramework.Interfaces.Audit;
 using TailoredApps.Shared.EntityFramework.Interfaces.UnitOfWork;
 
 namespace TailoredApps.Shared.EntityFramework.UnitOfWork.Audit.Hooks
@@ -15,4 +15,4 @@ public PostSaveChangesAuditHook(IUnitOfWorkAuditContext unitOfWorkAudit)
         public void Execute()
             => _unitOfWorkAudit.PostCollectChanges();
     }
-}
\ No newline at end of file
+}
diff --git a/src/TailoredApps.Shared.EntityFramework/UnitOfWork/Audit/Hooks/PreSaveChangesHook.cs b/src/TailoredApps.Shared.EntityFramework/UnitOfWork/Audit/Hooks/PreSaveChangesHook.cs
index 7513522..4c25a62 100644
--- a/src/TailoredApps.Shared.EntityFramework/UnitOfWork/Audit/Hooks/PreSaveChangesHook.cs
+++ b/src/TailoredApps.Shared.EntityFramework/UnitOfWork/Audit/Hooks/PreSaveChangesHook.cs
@@ -1,4 +1,4 @@
-using TailoredApps.Shared.EntityFramework.Interfaces.Audit;
+using TailoredApps.Shared.EntityFramework.Interfaces.Audit;
 using TailoredApps.Shared.EntityFramework.Interfaces.UnitOfWork;
 
 namespace TailoredApps.Shared.EntityFramework.UnitOfWork.Audit.Hooks
@@ -15,4 +15,4 @@ public PreSaveChangesAuditHook(IUnitOfWorkAuditContext unitOfWorkAudit)
         public void Execute()
             => _unitOfWorkAudit.CollectChanges();
     }
-}
\ No newline at end of file
+}
diff --git a/src/TailoredApps.Shared.EntityFramework/UnitOfWork/Audit/Hooks/TransactionCommitAuditHook.cs b/src/TailoredApps.Shared.EntityFramework/UnitOfWork/Audit/Hooks/TransactionCommitAuditHook.cs
index cbca390..ed73146 100644
--- a/src/TailoredApps.Shared.EntityFramework/UnitOfWork/Audit/Hooks/TransactionCommitAuditHook.cs
+++ b/src/TailoredApps.Shared.EntityFramework/UnitOfWork/Audit/Hooks/TransactionCommitAuditHook.cs
@@ -1,4 +1,4 @@
-using TailoredApps.Shared.EntityFramework.Interfaces.Audit;
+using TailoredApps.Shared.EntityFramework.Interfaces.Audit;
 using TailoredApps.Shared.EntityFramework.Interfaces.UnitOfWork;
 
 namespace TailoredApps.Shared.EntityFramework.UnitOfWork.Audit.Hooks
@@ -15,4 +15,4 @@ public TransactionCommitAuditHook(IUnitOfWorkAuditContext unitOfWorkAudit)
         public void Execute()
             => _unitOfWorkAudit.AuditChanges();
     }
-}
\ No newline at end of file
+}
diff --git a/src/TailoredApps.Shared.EntityFramework/UnitOfWork/Audit/Hooks/TransactionRollbackAuditHook.cs b/src/TailoredApps.Shared.EntityFramework/UnitOfWork/Audit/Hooks/TransactionRollbackAuditHook.cs
index f8e633b..79220cb 100644
--- a/src/TailoredApps.Shared.EntityFramework/UnitOfWork/Audit/Hooks/TransactionRollbackAuditHook.cs
+++ b/src/TailoredApps.Shared.EntityFramework/UnitOfWork/Audit/Hooks/TransactionRollbackAuditHook.cs
@@ -1,4 +1,4 @@
-using TailoredApps.Shared.EntityFramework.Interfaces.Audit;
+using TailoredApps.Shared.EntityFramework.Interfaces.Audit;
 using TailoredApps.Shared.EntityFramework.Interfaces.UnitOfWork;
 
 namespace TailoredApps.Shared.EntityFramework.UnitOfWork.Audit.Hooks
@@ -15,4 +15,4 @@ public TransactionRollbackAuditHook(IUnitOfWorkAuditContext unitOfWorkAudit)
         public void Execute()
             => _unitOfWorkAudit.DiscardChanges();
     }
-}
\ No newline at end of file
+}
diff --git a/src/TailoredApps.Shared.EntityFramework/UnitOfWork/Audit/UnitOfWorkAuditContext.cs b/src/TailoredApps.Shared.EntityFramework/UnitOfWork/Audit/UnitOfWorkAuditContext.cs
index 0c8596d..6606e63 100644
--- a/src/TailoredApps.Shared.EntityFramework/UnitOfWork/Audit/UnitOfWorkAuditContext.cs
+++ b/src/TailoredApps.Shared.EntityFramework/UnitOfWork/Audit/UnitOfWorkAuditContext.cs
@@ -1,4 +1,4 @@
-using System.Collections.Generic;
+using System.Collections.Generic;
 using System.Linq;
 using TailoredApps.Shared.EntityFramework.Interfaces.Audit;
 using TailoredApps.Shared.EntityFramework.UnitOfWork.Audit.Changes;
@@ -72,4 +72,4 @@ private void Update(string identifier, IInternalEntityChange collectedEntityChan
             updateOperation(entityChangeUpdateContext);
         }
     }
-}
\ No newline at end of file
+}
diff --git a/src/TailoredApps.Shared.EntityFramework/UnitOfWork/InMemoryDbConnection.cs b/src/TailoredApps.Shared.EntityFramework/UnitOfWork/InMemoryDbConnection.cs
index d85b2cb..d416e06 100644
--- a/src/TailoredApps.Shared.EntityFramework/UnitOfWork/InMemoryDbConnection.cs
+++ b/src/TailoredApps.Shared.EntityFramework/UnitOfWork/InMemoryDbConnection.cs
@@ -1,46 +1,93 @@
-using System;
+using System;
 using System.Data;
 using System.Data.Common;
 
 namespace TailoredApps.Shared.EntityFramework.UnitOfWork
 {
-
+    /// <summary>
+    /// A stub <see cref="DbConnection"/> used as a placeholder when the EF Core InMemory provider is active.
+    /// All operations throw <see cref="NotSupportedException"/> because in-memory databases do not
+    /// expose a real underlying connection.
+    /// </summary>
     internal class InMemoryDbConnection : DbConnection
     {
+        /// <summary>
+        /// Not supported by the InMemory provider.
+        /// </summary>
+        /// <exception cref="NotSupportedException">Always thrown.</exception>
         protected override DbTransaction BeginDbTransaction(IsolationLevel isolationLevel)
         {
             throw new NotSupportedException("Not supported by InMemory DbContext");
         }
 
+        /// <summary>
+        /// Not supported by the InMemory provider.
+        /// </summary>
+        /// <exception cref="NotSupportedException">Always thrown.</exception>
         public override void Close()
         {
             throw new NotSupportedException("Not supported by InMemory DbContext");
         }
 
+        /// <summary>
+        /// Not supported by the InMemory provider.
+        /// </summary>
+        /// <exception cref="NotSupportedException">Always thrown.</exception>
         public override void ChangeDatabase(string databaseName)
         {
             throw new NotSupportedException("Not supported by InMemory DbContext");
         }
 
+        /// <summary>
+        /// Not supported by the InMemory provider.
+        /// </summary>
+        /// <exception cref="NotSupportedException">Always thrown.</exception>
         public override void Open()
         {
             throw new NotSupportedException("Not supported by InMemory DbContext");
         }
 
+        /// <summary>
+        /// Not supported by the InMemory provider.
+        /// </summary>
+        /// <exception cref="NotSupportedException">Always thrown on get or set.</exception>
         public override string ConnectionString
         {
             get => throw new NotSupportedException("Not supported by InMemory DbContext");
             set => throw new NotSupportedException("Not supported by InMemory DbContext");
         }
 
+        /// <summary>
+        /// Not supported by the InMemory provider.
+        /// </summary>
+        /// <exception cref="NotSupportedException">Always thrown.</exception>
         public override string Database => throw new NotSupportedException("Not supported by InMemory DbContext");
+
+        /// <summary>
+        /// Not supported by the InMemory provider.
+        /// </summary>
+        /// <exception cref="NotSupportedException">Always thrown.</exception>
         public override ConnectionState State => throw new NotSupportedException("Not supported by InMemory DbContext");
+
+        /// <summary>
+        /// Not supported by the InMemory provider.
+        /// </summary>
+        /// <exception cref="NotSupportedException">Always thrown.</exception>
         public override string DataSource => throw new NotSupportedException("Not supported by InMemory DbContext");
+
+        /// <summary>
+        /// Not supported by the InMemory provider.
+        /// </summary>
+        /// <exception cref="NotSupportedException">Always thrown.</exception>
         public override string ServerVersion => throw new NotSupportedException("Not supported by InMemory DbContext");
 
+        /// <summary>
+        /// Not supported by the InMemory provider.
+        /// </summary>
+        /// <exception cref="NotSupportedException">Always thrown.</exception>
         protected override DbCommand CreateDbCommand()
         {
             throw new NotSupportedException("Not supported by InMemory DbContext");
         }
     }
-}
\ No newline at end of file
+}
diff --git a/src/TailoredApps.Shared.EntityFramework/UnitOfWork/Transaction.cs b/src/TailoredApps.Shared.EntityFramework/UnitOfWork/Transaction.cs
index fc179c4..0b93e91 100644
--- a/src/TailoredApps.Shared.EntityFramework/UnitOfWork/Transaction.cs
+++ b/src/TailoredApps.Shared.EntityFramework/UnitOfWork/Transaction.cs
@@ -1,47 +1,47 @@
-using Microsoft.EntityFrameworkCore.Storage;
-using TailoredApps.Shared.EntityFramework.Interfaces.UnitOfWork;
-
-namespace TailoredApps.Shared.EntityFramework.UnitOfWork
-{
-    /// <summary>
-    /// Wraps an EF Core <see cref="IDbContextTransaction"/> and exposes it through the
-    /// <see cref="ITransaction"/> interface used by the Unit of Work layer.
-    /// </summary>
-    public class Transaction : ITransaction
-    {
-        private readonly IDbContextTransaction _transaction;
-
-        /// <summary>
-        /// Initializes a new instance of <see cref="Transaction"/>.
-        /// </summary>
-        /// <param name="transaction">The underlying EF Core database transaction to wrap.</param>
-        public Transaction(IDbContextTransaction transaction)
-        {
-            _transaction = transaction;
-        }
-
-        /// <summary>
-        /// Commits all changes made within this transaction to the database.
-        /// </summary>
-        public void Commit()
-        {
-            _transaction.Commit();
-        }
-
-        /// <summary>
-        /// Rolls back all changes made within this transaction, discarding any pending modifications.
-        /// </summary>
-        public void Rollback()
-        {
-            _transaction.Rollback();
-        }
-
-        /// <summary>
-        /// Disposes the underlying EF Core transaction.
-        /// </summary>
-        public void Dispose()
-        {
-            _transaction.Dispose();
-        }
-    }
-}
+using Microsoft.EntityFrameworkCore.Storage;
+using TailoredApps.Shared.EntityFramework.Interfaces.UnitOfWork;
+
+namespace TailoredApps.Shared.EntityFramework.UnitOfWork
+{
+    /// <summary>
+    /// Wraps an EF Core <see cref="IDbContextTransaction"/> and exposes it through the
+    /// <see cref="ITransaction"/> interface used by the Unit of Work layer.
+    /// </summary>
+    public class Transaction : ITransaction
+    {
+        private readonly IDbContextTransaction _transaction;
+
+        /// <summary>
+        /// Initializes a new instance of <see cref="Transaction"/>.
+        /// </summary>
+        /// <param name="transaction">The underlying EF Core database transaction to wrap.</param>
+        public Transaction(IDbContextTransaction transaction)
+        {
+            _transaction = transaction;
+        }
+
+        /// <summary>
+        /// Commits all changes made within this transaction to the database.
+        /// </summary>
+        public void Commit()
+        {
+            _transaction.Commit();
+        }
+
+        /// <summary>
+        /// Rolls back all changes made within this transaction, discarding any pending modifications.
+        /// </summary>
+        public void Rollback()
+        {
+            _transaction.Rollback();
+        }
+
+        /// <summary>
+        /// Disposes the underlying EF Core transaction.
+        /// </summary>
+        public void Dispose()
+        {
+            _transaction.Dispose();
+        }
+    }
+}
diff --git a/src/TailoredApps.Shared.EntityFramework/UnitOfWork/UnitOfWork.cs b/src/TailoredApps.Shared.EntityFramework/UnitOfWork/UnitOfWork.cs
index 4d60823..9f203a0 100644
--- a/src/TailoredApps.Shared.EntityFramework/UnitOfWork/UnitOfWork.cs
+++ b/src/TailoredApps.Shared.EntityFramework/UnitOfWork/UnitOfWork.cs
@@ -1,175 +1,175 @@
-using System;
-using System.Data;
-using System.Threading;
-using System.Threading.Tasks;
-using TailoredApps.Shared.EntityFramework.Interfaces.UnitOfWork;
-
-namespace TailoredApps.Shared.EntityFramework.UnitOfWork
-{
-    /// <summary>
-    /// Generic implementation of <see cref="IUnitOfWork{T}"/> that manages database transactions,
-    /// lifecycle hooks, and change persistence for the provided data provider of type <typeparamref name="T"/>.
-    /// </summary>
-    /// <typeparam name="T">The type of the data provider (e.g. a DbContext interface).</typeparam>
-    public class UnitOfWork<T> : IUnitOfWork<T>
-    {
-        private readonly IUnitOfWorkContext _context;
-        private readonly IHooksManager _hooksManager;
-        private ITransaction _transaction;
-        private IsolationLevel _isolationLevel;
-
-        /// <summary>
-        /// Gets the underlying data provider (e.g. a repository or DbContext interface).
-        /// </summary>
-        public T DataProvider { get; }
-
-        /// <summary>
-        /// Gets a value indicating whether a database transaction is currently open.
-        /// </summary>
-        public bool HasOpenTransaction => _transaction != null;
-
-        /// <summary>
-        /// Initializes a new instance of <see cref="UnitOfWork{T}"/>.
-        /// </summary>
-        /// <param name="context">The low-level context used for transaction and save operations.</param>
-        /// <param name="dataProvider">The typed data provider exposed to consumers.</param>
-        /// <param name="hooksManager">The hooks manager used to invoke lifecycle hooks.</param>
-        public UnitOfWork(IUnitOfWorkContext context, T dataProvider, IHooksManager hooksManager)
-        {
-            _context = context;
-            _hooksManager = hooksManager;
-            DataProvider = dataProvider;
-            var dbConnection = _context.GetDbConnection();
-            dbConnection.StateChange += OnStateChange;
-            _isolationLevel = IsolationLevel.ReadCommitted;
-        }
-
-        private void StartNewTransactionIfNeeded()
-        {
-            if (_transaction == null)
-            {
-                _transaction = _context.BeginTransaction(_isolationLevel);
-            }
-        }
-
-        /// <inheritdoc/>
-        public void BeginTransactionManually()
-        {
-            StartNewTransactionIfNeeded();
-        }
-
-        /// <inheritdoc/>
-        public void CommitTransaction()
-        {
-            SaveChanges();
-
-            if (_transaction != null)
-            {
-                _transaction.Commit();
-                _transaction.Dispose();
-                _transaction = null;
-            }
-
-            _hooksManager.ExecuteTransactionCommitHooks();
-        }
-
-        /// <inheritdoc/>
-        public void CommitTransaction(IsolationLevel isolationLevel)
-        {
-            CommitTransaction();
-
-            _isolationLevel = isolationLevel;
-        }
-
-        /// <inheritdoc/>
-        public void RollbackTransaction()
-        {
-            _context.DiscardChanges();
-            _hooksManager.ExecuteTransactionRollbackHooks();
-
-            if (_transaction == null)
-                return;
-
-            _transaction.Rollback();
-            _transaction.Dispose();
-            _transaction = null;
-        }
-
-        /// <inheritdoc/>
-        public void RollbackTransaction(IsolationLevel isolationLevel)
-        {
-            RollbackTransaction();
-
-            _isolationLevel = isolationLevel;
-        }
-
-        /// <inheritdoc/>
-        public int SaveChanges()
-        {
-            StartNewTransactionIfNeeded();
-
-            _hooksManager.ExecutePreSaveChangesHooks();
-
-            var result = _context.SaveChanges();
-
-            _hooksManager.ExecutePostSaveChangesHooks();
-
-            return result;
-        }
-
-        /// <inheritdoc/>
-        public async Task<int> SaveChangesAsync(CancellationToken cancellationToken = default(CancellationToken))
-        {
-            StartNewTransactionIfNeeded();
-
-            _hooksManager.ExecutePreSaveChangesHooks();
-
-            var result = await _context.SaveChangesAsync(cancellationToken);
-
-            _hooksManager.ExecutePostSaveChangesHooks();
-
-            return result;
-        }
-
-        /// <inheritdoc/>
-        public void SetIsolationLevel(IsolationLevel isolationLevel)
-        {
-            _isolationLevel = isolationLevel;
-        }
-
-        private void OnStateChange(object sender, StateChangeEventArgs args)
-        {
-            if (args.CurrentState == ConnectionState.Open && args.OriginalState != ConnectionState.Open)
-            {
-                var dbConnection = _context.GetDbConnection();
-                using (var command = dbConnection.CreateCommand())
-                {
-                    switch (_isolationLevel)
-                    {
-                        case IsolationLevel.ReadCommitted:
-                            command.CommandText = "SET TRANSACTION ISOLATION LEVEL READ COMMITTED";
-                            break;
-                        case IsolationLevel.ReadUncommitted:
-                            command.CommandText = "SET TRANSACTION ISOLATION LEVEL READ UNCOMMITTED";
-                            break;
-                        case IsolationLevel.Serializable:
-                            command.CommandText = "SET TRANSACTION ISOLATION LEVEL SERIALIZABLE";
-                            break;
-                        default:
-                            throw new ArgumentOutOfRangeException($"The UoW library does not support isolation level {_isolationLevel}");
-                    }
-                    command.ExecuteNonQuery();
-                }
-            }
-        }
-
-        /// <summary>
-        /// Disposes the current transaction if one is open.
-        /// </summary>
-        public void Dispose()
-        {
-            _transaction?.Dispose();
-            _transaction = null;
-        }
-    }
-}
+using System;
+using System.Data;
+using System.Threading;
+using System.Threading.Tasks;
+using TailoredApps.Shared.EntityFramework.Interfaces.UnitOfWork;
+
+namespace TailoredApps.Shared.EntityFramework.UnitOfWork
+{
+    /// <summary>
+    /// Generic implementation of <see cref="IUnitOfWork{T}"/> that manages database transactions,
+    /// lifecycle hooks, and change persistence for the provided data provider of type <typeparamref name="T"/>.
+    /// </summary>
+    /// <typeparam name="T">The type of the data provider (e.g. a DbContext interface).</typeparam>
+    public class UnitOfWork<T> : IUnitOfWork<T>
+    {
+        private readonly IUnitOfWorkContext _context;
+        private readonly IHooksManager _hooksManager;
+        private ITransaction _transaction;
+        private IsolationLevel _isolationLevel;
+
+        /// <summary>
+        /// Gets the underlying data provider (e.g. a repository or DbContext interface).
+        /// </summary>
+        public T DataProvider { get; }
+
+        /// <summary>
+        /// Gets a value indicating whether a database transaction is currently open.
+        /// </summary>
+        public bool HasOpenTransaction => _transaction != null;
+
+        /// <summary>
+        /// Initializes a new instance of <see cref="UnitOfWork{T}"/>.
+        /// </summary>
+        /// <param name="context">The low-level context used for transaction and save operations.</param>
+        /// <param name="dataProvider">The typed data provider exposed to consumers.</param>
+        /// <param name="hooksManager">The hooks manager used to invoke lifecycle hooks.</param>
+        public UnitOfWork(IUnitOfWorkContext context, T dataProvider, IHooksManager hooksManager)
+        {
+            _context = context;
+            _hooksManager = hooksManager;
+            DataProvider = dataProvider;
+            var dbConnection = _context.GetDbConnection();
+            dbConnection.StateChange += OnStateChange;
+            _isolationLevel = IsolationLevel.ReadCommitted;
+        }
+
+        private void StartNewTransactionIfNeeded()
+        {
+            if (_transaction == null)
+            {
+                _transaction = _context.BeginTransaction(_isolationLevel);
+            }
+        }
+
+        /// <inheritdoc/>
+        public void BeginTransactionManually()
+        {
+            StartNewTransactionIfNeeded();
+        }
+
+        /// <inheritdoc/>
+        public void CommitTransaction()
+        {
+            SaveChanges();
+
+            if (_transaction != null)
+            {
+                _transaction.Commit();
+                _transaction.Dispose();
+                _transaction = null;
+            }
+
+            _hooksManager.ExecuteTransactionCommitHooks();
+        }
+
+        /// <inheritdoc/>
+        public void CommitTransaction(IsolationLevel isolationLevel)
+        {
+            CommitTransaction();
+
+            _isolationLevel = isolationLevel;
+        }
+
+        /// <inheritdoc/>
+        public void RollbackTransaction()
+        {
+            _context.DiscardChanges();
+            _hooksManager.ExecuteTransactionRollbackHooks();
+
+            if (_transaction == null)
+                return;
+
+            _transaction.Rollback();
+            _transaction.Dispose();
+            _transaction = null;
+        }
+
+        /// <inheritdoc/>
+        public void RollbackTransaction(IsolationLevel isolationLevel)
+        {
+            RollbackTransaction();
+
+            _isolationLevel = isolationLevel;
+        }
+
+        /// <inheritdoc/>
+        public int SaveChanges()
+        {
+            StartNewTransactionIfNeeded();
+
+            _hooksManager.ExecutePreSaveChangesHooks();
+
+            var result = _context.SaveChanges();
+
+            _hooksManager.ExecutePostSaveChangesHooks();
+
+            return result;
+        }
+
+        /// <inheritdoc/>
+        public async Task<int> SaveChangesAsync(CancellationToken cancellationToken = default(CancellationToken))
+        {
+            StartNewTransactionIfNeeded();
+
+            _hooksManager.ExecutePreSaveChangesHooks();
+
+            var result = await _context.SaveChangesAsync(cancellationToken);
+
+            _hooksManager.ExecutePostSaveChangesHooks();
+
+            return result;
+        }
+
+        /// <inheritdoc/>
+        public void SetIsolationLevel(IsolationLevel isolationLevel)
+        {
+            _isolationLevel = isolationLevel;
+        }
+
+        private void OnStateChange(object sender, StateChangeEventArgs args)
+        {
+            if (args.CurrentState == ConnectionState.Open && args.OriginalState != ConnectionState.Open)
+            {
+                var dbConnection = _context.GetDbConnection();
+                using (var command = dbConnection.CreateCommand())
+                {
+                    switch (_isolationLevel)
+                    {
+                        case IsolationLevel.ReadCommitted:
+                            command.CommandText = "SET TRANSACTION ISOLATION LEVEL READ COMMITTED";
+                            break;
+                        case IsolationLevel.ReadUncommitted:
+                            command.CommandText = "SET TRANSACTION ISOLATION LEVEL READ UNCOMMITTED";
+                            break;
+                        case IsolationLevel.Serializable:
+                            command.CommandText = "SET TRANSACTION ISOLATION LEVEL SERIALIZABLE";
+                            break;
+                        default:
+                            throw new ArgumentOutOfRangeException($"The UoW library does not support isolation level {_isolationLevel}");
+                    }
+                    command.ExecuteNonQuery();
+                }
+            }
+        }
+
+        /// <summary>
+        /// Disposes the current transaction if one is open.
+        /// </summary>
+        public void Dispose()
+        {
+            _transaction?.Dispose();
+            _transaction = null;
+        }
+    }
+}
diff --git a/src/TailoredApps.Shared.EntityFramework/UnitOfWork/UnitOfWorkContext.cs b/src/TailoredApps.Shared.EntityFramework/UnitOfWork/UnitOfWorkContext.cs
index 11606c6..03e7187 100644
--- a/src/TailoredApps.Shared.EntityFramework/UnitOfWork/UnitOfWorkContext.cs
+++ b/src/TailoredApps.Shared.EntityFramework/UnitOfWork/UnitOfWorkContext.cs
@@ -1,97 +1,96 @@
-using Microsoft.EntityFrameworkCore;
-
-using System.Data;
-using System.Data.Common;
-using System.Linq;
-using System.Threading;
-using System.Threading.Tasks;
-using TailoredApps.Shared.EntityFramework.Interfaces.UnitOfWork;
-
-namespace TailoredApps.Shared.EntityFramework.UnitOfWork
-{
-    /// <summary>
-    /// EF Core implementation of <see cref="IUnitOfWorkContext"/> that wraps a
-    /// <typeparamref name="T"/> <see cref="DbContext"/> instance.
-    /// Provides transaction management, save operations, change discarding, and connection access.
-    /// </summary>
-    /// <typeparam name="T">The EF Core DbContext type.</typeparam>
-    public class UnitOfWorkContext<T> : IUnitOfWorkContext where T : DbContext
-    {
-        private readonly T _dbContext;
-
-        /// <summary>
-        /// Initializes a new instance of <see cref="UnitOfWorkContext{T}"/>.
-        /// </summary>
-        /// <param name="dbContext">The EF Core DbContext to wrap.</param>
-        public UnitOfWorkContext(T dbContext)
-        {
-            _dbContext = dbContext;
-        }
-
-        /// <summary>
-        /// Returns the underlying <see cref="DbConnection"/> for the context.
-        /// Returns an <see cref="InMemoryDbConnection"/> when the provider is the EF Core InMemory provider.
-        /// </summary>
-        /// <returns>The active or in-memory database connection.</returns>
-        public DbConnection GetDbConnection()
-        {
-            if (_dbContext.Database.ProviderName == "Microsoft.EntityFrameworkCore.InMemory")
-                return new InMemoryDbConnection();
-
-            return _dbContext.Database.GetDbConnection();
-        }
-
-        /// <summary>
-        /// Begins a new database transaction with the default isolation level.
-        /// </summary>
-        /// <returns>An <see cref="ITransaction"/> wrapping the EF Core transaction.</returns>
-        public ITransaction BeginTransaction()
-        {
-            var dbTransaction = _dbContext.Database.BeginTransaction();
-
-            return new Transaction(dbTransaction);
-        }
-
-        /// <summary>
-        /// Begins a new database transaction with the specified isolation level.
-        /// </summary>
-        /// <param name="isolationLevel">The isolation level for the transaction.</param>
-        /// <returns>An <see cref="ITransaction"/> wrapping the EF Core transaction.</returns>
-        public ITransaction BeginTransaction(IsolationLevel isolationLevel)
-        {
-            var dbTransaction = _dbContext.Database.BeginTransaction(isolationLevel);
-
-            return new Transaction(dbTransaction);
-        }
-
-        /// <summary>
-        /// Saves all pending changes to the database via the underlying DbContext.
-        /// </summary>
-        /// <returns>The number of state entries written to the database.</returns>
-        public int SaveChanges()
-        {
-            return _dbContext.SaveChanges();
-        }
-
-        /// <summary>
-        /// Asynchronously saves all pending changes to the database via the underlying DbContext.
-        /// </summary>
-        /// <param name="cancellationToken">A token to cancel the operation.</param>
-        /// <returns>The number of state entries written to the database.</returns>
-        public async Task<int> SaveChangesAsync(CancellationToken cancellationToken = default(CancellationToken))
-        {
-            return await _dbContext.SaveChangesAsync(cancellationToken);
-        }
-
-        /// <summary>
-        /// Detaches all tracked entities from the change tracker, discarding any unsaved modifications.
-        /// </summary>
-        public void DiscardChanges()
-        {
-            foreach (var entry in _dbContext.ChangeTracker.Entries().ToList())
-            {
-                entry.State = EntityState.Detached;
-            }
-        }
-    }
-}
+using System.Data;
+using System.Data.Common;
+using System.Linq;
+using System.Threading;
+using System.Threading.Tasks;
+using Microsoft.EntityFrameworkCore;
+using TailoredApps.Shared.EntityFramework.Interfaces.UnitOfWork;
+
+namespace TailoredApps.Shared.EntityFramework.UnitOfWork
+{
+    /// <summary>
+    /// EF Core implementation of <see cref="IUnitOfWorkContext"/> that wraps a
+    /// <typeparamref name="T"/> <see cref="DbContext"/> instance.
+    /// Provides transaction management, save operations, change discarding, and connection access.
+    /// </summary>
+    /// <typeparam name="T">The EF Core DbContext type.</typeparam>
+    public class UnitOfWorkContext<T> : IUnitOfWorkContext where T : DbContext
+    {
+        private readonly T _dbContext;
+
+        /// <summary>
+        /// Initializes a new instance of <see cref="UnitOfWorkContext{T}"/>.
+        /// </summary>
+        /// <param name="dbContext">The EF Core DbContext to wrap.</param>
+        public UnitOfWorkContext(T dbContext)
+        {
+            _dbContext = dbContext;
+        }
+
+        /// <summary>
+        /// Returns the underlying <see cref="DbConnection"/> for the context.
+        /// Returns an <see cref="InMemoryDbConnection"/> when the provider is the EF Core InMemory provider.
+        /// </summary>
+        /// <returns>The active or in-memory database connection.</returns>
+        public DbConnection GetDbConnection()
+        {
+            if (_dbContext.Database.ProviderName == "Microsoft.EntityFrameworkCore.InMemory")
+                return new InMemoryDbConnection();
+
+            return _dbContext.Database.GetDbConnection();
+        }
+
+        /// <summary>
+        /// Begins a new database transaction with the default isolation level.
+        /// </summary>
+        /// <returns>An <see cref="ITransaction"/> wrapping the EF Core transaction.</returns>
+        public ITransaction BeginTransaction()
+        {
+            var dbTransaction = _dbContext.Database.BeginTransaction();
+
+            return new Transaction(dbTransaction);
+        }
+
+        /// <summary>
+        /// Begins a new database transaction with the specified isolation level.
+        /// </summary>
+        /// <param name="isolationLevel">The isolation level for the transaction.</param>
+        /// <returns>An <see cref="ITransaction"/> wrapping the EF Core transaction.</returns>
+        public ITransaction BeginTransaction(IsolationLevel isolationLevel)
+        {
+            var dbTransaction = _dbContext.Database.BeginTransaction(isolationLevel);
+
+            return new Transaction(dbTransaction);
+        }
+
+        /// <summary>
+        /// Saves all pending changes to the database via the underlying DbContext.
+        /// </summary>
+        /// <returns>The number of state entries written to the database.</returns>
+        public int SaveChanges()
+        {
+            return _dbContext.SaveChanges();
+        }
+
+        /// <summary>
+        /// Asynchronously saves all pending changes to the database via the underlying DbContext.
+        /// </summary>
+        /// <param name="cancellationToken">A token to cancel the operation.</param>
+        /// <returns>The number of state entries written to the database.</returns>
+        public async Task<int> SaveChangesAsync(CancellationToken cancellationToken = default(CancellationToken))
+        {
+            return await _dbContext.SaveChangesAsync(cancellationToken);
+        }
+
+        /// <summary>
+        /// Detaches all tracked entities from the change tracker, discarding any unsaved modifications.
+        /// </summary>
+        public void DiscardChanges()
+        {
+            foreach (var entry in _dbContext.ChangeTracker.Entries().ToList())
+            {
+                entry.State = EntityState.Detached;
+            }
+        }
+    }
+}
diff --git a/src/TailoredApps.Shared.EntityFramework/UnitOfWork/UnitOfWorkHooksManager.cs b/src/TailoredApps.Shared.EntityFramework/UnitOfWork/UnitOfWorkHooksManager.cs
index 64942e0..2d6c269 100644
--- a/src/TailoredApps.Shared.EntityFramework/UnitOfWork/UnitOfWorkHooksManager.cs
+++ b/src/TailoredApps.Shared.EntityFramework/UnitOfWork/UnitOfWorkHooksManager.cs
@@ -1,4 +1,4 @@
-using System.Collections.Generic;
+using System.Collections.Generic;
 using System.Linq;
 using TailoredApps.Shared.EntityFramework.Interfaces.UnitOfWork;
 
@@ -31,4 +31,4 @@ private void ExecuteHooksOfType<THookType>()
                 hook.Execute();
         }
     }
-}
\ No newline at end of file
+}
diff --git a/src/TailoredApps.Shared.EntityFramework/UnitOfWork/UnitOfWorkOptionsBuilder.cs b/src/TailoredApps.Shared.EntityFramework/UnitOfWork/UnitOfWorkOptionsBuilder.cs
index dd4fa64..c1f8520 100644
--- a/src/TailoredApps.Shared.EntityFramework/UnitOfWork/UnitOfWorkOptionsBuilder.cs
+++ b/src/TailoredApps.Shared.EntityFramework/UnitOfWork/UnitOfWorkOptionsBuilder.cs
@@ -1,87 +1,87 @@
-using Microsoft.EntityFrameworkCore;
-using Microsoft.Extensions.DependencyInjection;
-using System;
-using TailoredApps.Shared.EntityFramework.Interfaces.UnitOfWork;
-
-namespace TailoredApps.Shared.EntityFramework.UnitOfWork
-{
-    internal class UnitOfWorkOptionsBuilder : IUnitOfWorkOptionsBuilder
-    {
-        public UnitOfWorkOptionsBuilder(IServiceCollection serviceCollection)
-        {
-            Services = serviceCollection;
-        }
-
-        public IServiceCollection Services { get; }
-
-        public IUnitOfWorkOptionsBuilder WithTransactionCommitHook<THook>() where THook : class, ITransactionCommitHook
-            => WithHook<THook>();
-
-        public IUnitOfWorkOptionsBuilder WithTransactionCommitHook<THook>(Func<IServiceProvider, THook> implementationFactory) where THook : class, ITransactionCommitHook
-            => WithHook(implementationFactory);
-
-        public IUnitOfWorkOptionsBuilder WithTransactionRollbackHook<THook>() where THook : class, ITransactionRollbackHook
-            => WithHook<THook>();
-
-        public IUnitOfWorkOptionsBuilder WithTransactionRollbackHook<THook>(Func<IServiceProvider, THook> implementationFactory) where THook : class, ITransactionRollbackHook
-            => WithHook(implementationFactory);
-
-        public IUnitOfWorkOptionsBuilder WithPreSaveChangesHook<THook>() where THook : class, IPreSaveChangesHook
-            => WithHook<THook>();
-
-        public IUnitOfWorkOptionsBuilder WithPreSaveChangesHook<THook>(Func<IServiceProvider, THook> implementationFactory) where THook : class, IPreSaveChangesHook
-            => WithHook(implementationFactory);
-
-        public IUnitOfWorkOptionsBuilder WithPostSaveChangesHook<THook>() where THook : class, IPostSaveChangesHook
-            => WithHook<THook>();
-
-        public IUnitOfWorkOptionsBuilder WithPostSaveChangesHook<THook>(Func<IServiceProvider, THook> implementationFactory) where THook : class, IPostSaveChangesHook
-            => WithHook(implementationFactory);
-
-        private IUnitOfWorkOptionsBuilder WithHook<THook>() where THook : class, IHook
-        {
-            Services.AddTransient<IHook, THook>();
-            return this;
-        }
-
-        private IUnitOfWorkOptionsBuilder WithHook<THook>(Func<IServiceProvider, THook> implementationFactory)
-            where THook : class, IHook
-        {
-            Services.AddTransient<IHook, THook>(implementationFactory);
-            return this;
-        }
-    }
-
-    /// <summary>
-    /// Provides extension methods on <see cref="IServiceCollection"/> for registering
-    /// the Unit of Work infrastructure.
-    /// </summary>
-    public static class ServiceCollectionExtensions
-    {
-        /// <summary>
-        /// Registers the Unit of Work services for the specified DbContext and its interface,
-        /// wiring up the context, hooks manager, and scoped UoW instances.
-        /// </summary>
-        /// <typeparam name="TTargetDbContextInterface">The interface type exposed to consumers.</typeparam>
-        /// <typeparam name="TTargetDbContext">
-        /// The concrete EF Core DbContext type that implements <typeparamref name="TTargetDbContextInterface"/>.
-        /// </typeparam>
-        /// <param name="services">The service collection to register into.</param>
-        /// <returns>
-        /// An <see cref="IUnitOfWorkOptionsBuilder"/> for registering lifecycle hooks and other options.
-        /// </returns>
-        public static IUnitOfWorkOptionsBuilder AddUnitOfWork<TTargetDbContextInterface, TTargetDbContext>(this IServiceCollection services)
-            where TTargetDbContext : DbContext, TTargetDbContextInterface
-            where TTargetDbContextInterface : class
-        {
-            services.AddScoped<TTargetDbContextInterface, TTargetDbContext>(container => container.GetRequiredService<TTargetDbContext>());
-            services.AddScoped<IUnitOfWorkContext, UnitOfWorkContext<TTargetDbContext>>();
-            services.AddScoped<UnitOfWork<TTargetDbContextInterface>>();
-            services.AddScoped<IUnitOfWork>(container => container.GetRequiredService<UnitOfWork<TTargetDbContextInterface>>());
-            services.AddScoped<IUnitOfWork<TTargetDbContextInterface>>(container => container.GetRequiredService<UnitOfWork<TTargetDbContextInterface>>());
-            services.AddTransient<IHooksManager, UnitOfWorkHooksManager>();
-
-            return new UnitOfWorkOptionsBuilder(services);
-        }
-    }
-}
+using System;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.Extensions.DependencyInjection;
+using TailoredApps.Shared.EntityFramework.Interfaces.UnitOfWork;
+
+namespace TailoredApps.Shared.EntityFramework.UnitOfWork
+{
+    internal class UnitOfWorkOptionsBuilder : IUnitOfWorkOptionsBuilder
+    {
+        public UnitOfWorkOptionsBuilder(IServiceCollection serviceCollection)
+        {
+            Services = serviceCollection;
+        }
+
+        public IServiceCollection Services { get; }
+
+        public IUnitOfWorkOptionsBuilder WithTransactionCommitHook<THook>() where THook : class, ITransactionCommitHook
+            => WithHook<THook>();
+
+        public IUnitOfWorkOptionsBuilder WithTransactionCommitHook<THook>(Func<IServiceProvider, THook> implementationFactory) where THook : class, ITransactionCommitHook
+            => WithHook(implementationFactory);
+
+        public IUnitOfWorkOptionsBuilder WithTransactionRollbackHook<THook>() where THook : class, ITransactionRollbackHook
+            => WithHook<THook>();
+
+        public IUnitOfWorkOptionsBuilder WithTransactionRollbackHook<THook>(Func<IServiceProvider, THook> implementationFactory) where THook : class, ITransactionRollbackHook
+            => WithHook(implementationFactory);
+
+        public IUnitOfWorkOptionsBuilder WithPreSaveChangesHook<THook>() where THook : class, IPreSaveChangesHook
+            => WithHook<THook>();
+
+        public IUnitOfWorkOptionsBuilder WithPreSaveChangesHook<THook>(Func<IServiceProvider, THook> implementationFactory) where THook : class, IPreSaveChangesHook
+            => WithHook(implementationFactory);
+
+        public IUnitOfWorkOptionsBuilder WithPostSaveChangesHook<THook>() where THook : class, IPostSaveChangesHook
+            => WithHook<THook>();
+
+        public IUnitOfWorkOptionsBuilder WithPostSaveChangesHook<THook>(Func<IServiceProvider, THook> implementationFactory) where THook : class, IPostSaveChangesHook
+            => WithHook(implementationFactory);
+
+        private IUnitOfWorkOptionsBuilder WithHook<THook>() where THook : class, IHook
+        {
+            Services.AddTransient<IHook, THook>();
+            return this;
+        }
+
+        private IUnitOfWorkOptionsBuilder WithHook<THook>(Func<IServiceProvider, THook> implementationFactory)
+            where THook : class, IHook
+        {
+            Services.AddTransient<IHook, THook>(implementationFactory);
+            return this;
+        }
+    }
+
+    /// <summary>
+    /// Provides extension methods on <see cref="IServiceCollection"/> for registering
+    /// the Unit of Work infrastructure.
+    /// </summary>
+    public static class ServiceCollectionExtensions
+    {
+        /// <summary>
+        /// Registers the Unit of Work services for the specified DbContext and its interface,
+        /// wiring up the context, hooks manager, and scoped UoW instances.
+        /// </summary>
+        /// <typeparam name="TTargetDbContextInterface">The interface type exposed to consumers.</typeparam>
+        /// <typeparam name="TTargetDbContext">
+        /// The concrete EF Core DbContext type that implements <typeparamref name="TTargetDbContextInterface"/>.
+        /// </typeparam>
+        /// <param name="services">The service collection to register into.</param>
+        /// <returns>
+        /// An <see cref="IUnitOfWorkOptionsBuilder"/> for registering lifecycle hooks and other options.
+        /// </returns>
+        public static IUnitOfWorkOptionsBuilder AddUnitOfWork<TTargetDbContextInterface, TTargetDbContext>(this IServiceCollection services)
+            where TTargetDbContext : DbContext, TTargetDbContextInterface
+            where TTargetDbContextInterface : class
+        {
+            services.AddScoped<TTargetDbContextInterface, TTargetDbContext>(container => container.GetRequiredService<TTargetDbContext>());
+            services.AddScoped<IUnitOfWorkContext, UnitOfWorkContext<TTargetDbContext>>();
+            services.AddScoped<UnitOfWork<TTargetDbContextInterface>>();
+            services.AddScoped<IUnitOfWork>(container => container.GetRequiredService<UnitOfWork<TTargetDbContextInterface>>());
+            services.AddScoped<IUnitOfWork<TTargetDbContextInterface>>(container => container.GetRequiredService<UnitOfWork<TTargetDbContextInterface>>());
+            services.AddTransient<IHooksManager, UnitOfWorkHooksManager>();
+
+            return new UnitOfWorkOptionsBuilder(services);
+        }
+    }
+}
diff --git a/src/TailoredApps.Shared.ExceptionHandling/HttpResult/ExceptionOccuredResult.cs b/src/TailoredApps.Shared.ExceptionHandling/HttpResult/ExceptionOccuredResult.cs
index e2ba5a7..0b37b30 100644
--- a/src/TailoredApps.Shared.ExceptionHandling/HttpResult/ExceptionOccuredResult.cs
+++ b/src/TailoredApps.Shared.ExceptionHandling/HttpResult/ExceptionOccuredResult.cs
@@ -1,25 +1,25 @@
-using Microsoft.AspNetCore.Http;
-using Microsoft.AspNetCore.Mvc;
-using Microsoft.AspNetCore.Mvc.ModelBinding;
-using TailoredApps.Shared.ExceptionHandling.Model;
-
-namespace TailoredApps.Shared.ExceptionHandling.HttpResult
-{
-    /// <summary>Wynik HTTP 400 zwracany gdy wystąpi wyjątek lub błąd walidacji.</summary>
-    public class ExceptionOccuredResult : ObjectResult
-    {
-        /// <summary>Inicjalizuje wynik 400 z błędami walidacji modelu.</summary>
-        public ExceptionOccuredResult(ModelStateDictionary modelState)
-            : base(modelState)
-        {
-            StatusCode = StatusCodes.Status400BadRequest;
-        }
-
-        /// <summary>Inicjalizuje wynik 400 z modelem odpowiedzi wyjątku.</summary>
-        public ExceptionOccuredResult(ExceptionHandlingResultModel modelState)
-            : base(modelState)
-        {
-            StatusCode = StatusCodes.Status400BadRequest;
-        }
-    }
-}
+using Microsoft.AspNetCore.Http;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.AspNetCore.Mvc.ModelBinding;
+using TailoredApps.Shared.ExceptionHandling.Model;
+
+namespace TailoredApps.Shared.ExceptionHandling.HttpResult
+{
+    /// <summary>Wynik HTTP 400 zwracany gdy wystąpi wyjątek lub błąd walidacji.</summary>
+    public class ExceptionOccuredResult : ObjectResult
+    {
+        /// <summary>Inicjalizuje wynik 400 z błędami walidacji modelu.</summary>
+        public ExceptionOccuredResult(ModelStateDictionary modelState)
+            : base(modelState)
+        {
+            StatusCode = StatusCodes.Status400BadRequest;
+        }
+
+        /// <summary>Inicjalizuje wynik 400 z modelem odpowiedzi wyjątku.</summary>
+        public ExceptionOccuredResult(ExceptionHandlingResultModel modelState)
+            : base(modelState)
+        {
+            StatusCode = StatusCodes.Status400BadRequest;
+        }
+    }
+}
diff --git a/src/TailoredApps.Shared.ExceptionHandling/Interfaces/IExceptionHandlingOptionsBuilder.cs b/src/TailoredApps.Shared.ExceptionHandling/Interfaces/IExceptionHandlingOptionsBuilder.cs
index 2f7d00e..cf2a1cb 100644
--- a/src/TailoredApps.Shared.ExceptionHandling/Interfaces/IExceptionHandlingOptionsBuilder.cs
+++ b/src/TailoredApps.Shared.ExceptionHandling/Interfaces/IExceptionHandlingOptionsBuilder.cs
@@ -1,18 +1,18 @@
-using Microsoft.Extensions.DependencyInjection;
-using System;
-
-namespace TailoredApps.Shared.ExceptionHandling.Interfaces
-{
-    /// <summary>Builder do konfigurowania dostawców obsługi wyjątków w DI.</summary>
-    public interface IExceptionHandlingOptionsBuilder
-    {
-        /// <summary>Rejestruje dostawcę obsługi wyjątków (automatyczna aktywacja przez DI).</summary>
-        IExceptionHandlingOptionsBuilder WithExceptionHandlingProvider<Provider>() where Provider : class, IExceptionHandlingProvider;
-
-        /// <summary>Rejestruje dostawcę obsługi wyjątków z fabryczną metodą tworzenia instancji.</summary>
-        IExceptionHandlingOptionsBuilder WithExceptionHandlingProvider<Provider>(Func<IServiceProvider, Provider> implementationFactory) where Provider : class, IExceptionHandlingProvider;
-
-        /// <summary>Kolekcja usług DI, do której rejestrowane są dostawcy.</summary>
-        IServiceCollection Services { get; }
-    }
-}
+using System;
+using Microsoft.Extensions.DependencyInjection;
+
+namespace TailoredApps.Shared.ExceptionHandling.Interfaces
+{
+    /// <summary>Builder do konfigurowania dostawców obsługi wyjątków w DI.</summary>
+    public interface IExceptionHandlingOptionsBuilder
+    {
+        /// <summary>Rejestruje dostawcę obsługi wyjątków (automatyczna aktywacja przez DI).</summary>
+        IExceptionHandlingOptionsBuilder WithExceptionHandlingProvider<Provider>() where Provider : class, IExceptionHandlingProvider;
+
+        /// <summary>Rejestruje dostawcę obsługi wyjątków z fabryczną metodą tworzenia instancji.</summary>
+        IExceptionHandlingOptionsBuilder WithExceptionHandlingProvider<Provider>(Func<IServiceProvider, Provider> implementationFactory) where Provider : class, IExceptionHandlingProvider;
+
+        /// <summary>Kolekcja usług DI, do której rejestrowane są dostawcy.</summary>
+        IServiceCollection Services { get; }
+    }
+}
diff --git a/src/TailoredApps.Shared.ExceptionHandling/Interfaces/IExceptionHandlingProvider.cs b/src/TailoredApps.Shared.ExceptionHandling/Interfaces/IExceptionHandlingProvider.cs
index 0d97f9c..81b4ced 100644
--- a/src/TailoredApps.Shared.ExceptionHandling/Interfaces/IExceptionHandlingProvider.cs
+++ b/src/TailoredApps.Shared.ExceptionHandling/Interfaces/IExceptionHandlingProvider.cs
@@ -1,16 +1,16 @@
-using Microsoft.AspNetCore.Mvc.ModelBinding;
-using System;
-using TailoredApps.Shared.ExceptionHandling.Model;
-
-namespace TailoredApps.Shared.ExceptionHandling.Interfaces
-{
-    /// <summary>Interfejs dostawcy obsługi wyjątków — mapuje wyjątki na modele odpowiedzi HTTP.</summary>
-    public interface IExceptionHandlingProvider
-    {
-        /// <summary>Tworzy model odpowiedzi dla danego wyjątku.</summary>
-        ExceptionHandlingResultModel Response(Exception exception);
-
-        /// <summary>Tworzy model odpowiedzi dla błędów walidacji modelu.</summary>
-        ExceptionHandlingResultModel Response(ModelStateDictionary modelState);
-    }
-}
+using System;
+using Microsoft.AspNetCore.Mvc.ModelBinding;
+using TailoredApps.Shared.ExceptionHandling.Model;
+
+namespace TailoredApps.Shared.ExceptionHandling.Interfaces
+{
+    /// <summary>Interfejs dostawcy obsługi wyjątków — mapuje wyjątki na modele odpowiedzi HTTP.</summary>
+    public interface IExceptionHandlingProvider
+    {
+        /// <summary>Tworzy model odpowiedzi dla danego wyjątku.</summary>
+        ExceptionHandlingResultModel Response(Exception exception);
+
+        /// <summary>Tworzy model odpowiedzi dla błędów walidacji modelu.</summary>
+        ExceptionHandlingResultModel Response(ModelStateDictionary modelState);
+    }
+}
diff --git a/src/TailoredApps.Shared.ExceptionHandling/Interfaces/IExceptionHandlingService.cs b/src/TailoredApps.Shared.ExceptionHandling/Interfaces/IExceptionHandlingService.cs
index e29d570..7dd3492 100644
--- a/src/TailoredApps.Shared.ExceptionHandling/Interfaces/IExceptionHandlingService.cs
+++ b/src/TailoredApps.Shared.ExceptionHandling/Interfaces/IExceptionHandlingService.cs
@@ -1,40 +1,40 @@
-using Microsoft.AspNetCore.Mvc.ModelBinding;
-using System;
-using TailoredApps.Shared.ExceptionHandling.Model;
-
-namespace TailoredApps.Shared.ExceptionHandling.Interfaces
-{
-    /// <summary>
-    /// Defines the contract for a service that converts exceptions and model-state errors
-    /// into a standardized <see cref="ExceptionHandlingResultModel"/> response.
-    /// </summary>
-    public interface IExceptionHandlingService
-    {
-        /// <summary>
-        /// Creates an <see cref="ExceptionHandlingResultModel"/> from the given exception.
-        /// </summary>
-        /// <param name="exception">The exception to handle.</param>
-        /// <returns>A result model describing the error.</returns>
-        ExceptionHandlingResultModel Response(Exception exception);
-
-        /// <summary>
-        /// Creates an <see cref="ExceptionHandlingResultModel"/> from an invalid model state.
-        /// </summary>
-        /// <param name="modelState">The model state dictionary containing validation errors.</param>
-        /// <returns>A result model describing the validation errors.</returns>
-        ExceptionHandlingResultModel Response(ModelStateDictionary modelState);
-    }
-
-    /// <summary>
-    /// Defines the contract for a typed exception-handling service that exposes the underlying
-    /// <see cref="IExceptionHandlingProvider"/> of type <typeparamref name="T"/>.
-    /// </summary>
-    /// <typeparam name="T">The type of the exception handling provider.</typeparam>
-    public interface IExceptionHandlingService<T> : IExceptionHandlingService where T : IExceptionHandlingProvider
-    {
-        /// <summary>
-        /// Gets the concrete exception handling provider used by this service.
-        /// </summary>
-        public T ExceptionHandlingProvider { get; }
-    }
-}
+using System;
+using Microsoft.AspNetCore.Mvc.ModelBinding;
+using TailoredApps.Shared.ExceptionHandling.Model;
+
+namespace TailoredApps.Shared.ExceptionHandling.Interfaces
+{
+    /// <summary>
+    /// Defines the contract for a service that converts exceptions and model-state errors
+    /// into a standardized <see cref="ExceptionHandlingResultModel"/> response.
+    /// </summary>
+    public interface IExceptionHandlingService
+    {
+        /// <summary>
+        /// Creates an <see cref="ExceptionHandlingResultModel"/> from the given exception.
+        /// </summary>
+        /// <param name="exception">The exception to handle.</param>
+        /// <returns>A result model describing the error.</returns>
+        ExceptionHandlingResultModel Response(Exception exception);
+
+        /// <summary>
+        /// Creates an <see cref="ExceptionHandlingResultModel"/> from an invalid model state.
+        /// </summary>
+        /// <param name="modelState">The model state dictionary containing validation errors.</param>
+        /// <returns>A result model describing the validation errors.</returns>
+        ExceptionHandlingResultModel Response(ModelStateDictionary modelState);
+    }
+
+    /// <summary>
+    /// Defines the contract for a typed exception-handling service that exposes the underlying
+    /// <see cref="IExceptionHandlingProvider"/> of type <typeparamref name="T"/>.
+    /// </summary>
+    /// <typeparam name="T">The type of the exception handling provider.</typeparam>
+    public interface IExceptionHandlingService<T> : IExceptionHandlingService where T : IExceptionHandlingProvider
+    {
+        /// <summary>
+        /// Gets the concrete exception handling provider used by this service.
+        /// </summary>
+        public T ExceptionHandlingProvider { get; }
+    }
+}
diff --git a/src/TailoredApps.Shared.ExceptionHandling/Model/ExceptionHandlingResultModel.cs b/src/TailoredApps.Shared.ExceptionHandling/Model/ExceptionHandlingResultModel.cs
index 7bf803b..1801eee 100644
--- a/src/TailoredApps.Shared.ExceptionHandling/Model/ExceptionHandlingResultModel.cs
+++ b/src/TailoredApps.Shared.ExceptionHandling/Model/ExceptionHandlingResultModel.cs
@@ -1,80 +1,80 @@
-using Microsoft.AspNetCore.Mvc.ModelBinding;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text.Json;
-
-namespace TailoredApps.Shared.ExceptionHandling.Model
-{
-    /// <summary>
-    /// Represents the standardized error response model returned by the exception handling pipeline.
-    /// Contains an error code, a human-readable message, and a list of individual errors or validation failures.
-    /// </summary>
-    public class ExceptionHandlingResultModel
-    {
-        /// <summary>
-        /// Gets the human-readable error message that describes the overall failure.
-        /// </summary>
-        public string Message { get; }
-
-        /// <summary>
-        /// Gets the HTTP-style error code associated with this response (e.g. 400, 500).
-        /// </summary>
-        public int ErrorCode { get; }
-
-        /// <summary>
-        /// Gets or sets the list of individual errors or validation failures included in this response.
-        /// </summary>
-        public List<ExceptionOrValidationError> Errors { get; set; }
-
-        /// <summary>
-        /// Initializes a new instance of <see cref="ExceptionHandlingResultModel"/> with error code 400.
-        /// </summary>
-        /// <param name="messge">The human-readable error message.</param>
-        /// <param name="errors">The collection of individual errors.</param>
-        public ExceptionHandlingResultModel(string messge, IEnumerable<ExceptionOrValidationError> errors)
-            : this(400, messge, errors)
-        {
-
-        }
-
-        /// <summary>
-        /// Initializes a new instance of <see cref="ExceptionHandlingResultModel"/> with an explicit error code.
-        /// </summary>
-        /// <param name="code">The HTTP-style error code.</param>
-        /// <param name="message">The human-readable error message.</param>
-        /// <param name="errors">The collection of individual errors.</param>
-        public ExceptionHandlingResultModel(int code, string message, IEnumerable<ExceptionOrValidationError> errors)
-        {
-            this.ErrorCode = code;
-            this.Message = message;
-            this.Errors = new List<ExceptionOrValidationError>(errors);
-        }
-
-        /// <summary>
-        /// Initializes a new instance of <see cref="ExceptionHandlingResultModel"/> from an ASP.NET Core
-        /// <see cref="ModelStateDictionary"/>, producing a 400-level validation error response.
-        /// </summary>
-        /// <param name="errors">The model state dictionary containing validation errors.</param>
-        public ExceptionHandlingResultModel(ModelStateDictionary errors)
-        {
-            this.ErrorCode = 400;
-            this.Message = "Validation Failed";
-            this.Errors = errors.Keys
-                .SelectMany(key => errors[key].Errors.Select(x => new ExceptionOrValidationError(key, x.ErrorMessage)))
-                .ToList();
-        }
-
-        /// <summary>
-        /// Serializes this instance to a camel-case JSON string.
-        /// </summary>
-        /// <returns>A JSON representation of this result model.</returns>
-        public override string ToString()
-        {
-            return JsonSerializer.Serialize(this, typeof(ExceptionHandlingResultModel), new JsonSerializerOptions
-            {
-                PropertyNamingPolicy = JsonNamingPolicy.CamelCase,
-                WriteIndented = true
-            });
-        }
-    }
-}
+using System.Collections.Generic;
+using System.Linq;
+using System.Text.Json;
+using Microsoft.AspNetCore.Mvc.ModelBinding;
+
+namespace TailoredApps.Shared.ExceptionHandling.Model
+{
+    /// <summary>
+    /// Represents the standardized error response model returned by the exception handling pipeline.
+    /// Contains an error code, a human-readable message, and a list of individual errors or validation failures.
+    /// </summary>
+    public class ExceptionHandlingResultModel
+    {
+        /// <summary>
+        /// Gets the human-readable error message that describes the overall failure.
+        /// </summary>
+        public string Message { get; }
+
+        /// <summary>
+        /// Gets the HTTP-style error code associated with this response (e.g. 400, 500).
+        /// </summary>
+        public int ErrorCode { get; }
+
+        /// <summary>
+        /// Gets or sets the list of individual errors or validation failures included in this response.
+        /// </summary>
+        public List<ExceptionOrValidationError> Errors { get; set; }
+
+        /// <summary>
+        /// Initializes a new instance of <see cref="ExceptionHandlingResultModel"/> with error code 400.
+        /// </summary>
+        /// <param name="messge">The human-readable error message.</param>
+        /// <param name="errors">The collection of individual errors.</param>
+        public ExceptionHandlingResultModel(string messge, IEnumerable<ExceptionOrValidationError> errors)
+            : this(400, messge, errors)
+        {
+
+        }
+
+        /// <summary>
+        /// Initializes a new instance of <see cref="ExceptionHandlingResultModel"/> with an explicit error code.
+        /// </summary>
+        /// <param name="code">The HTTP-style error code.</param>
+        /// <param name="message">The human-readable error message.</param>
+        /// <param name="errors">The collection of individual errors.</param>
+        public ExceptionHandlingResultModel(int code, string message, IEnumerable<ExceptionOrValidationError> errors)
+        {
+            this.ErrorCode = code;
+            this.Message = message;
+            this.Errors = new List<ExceptionOrValidationError>(errors);
+        }
+
+        /// <summary>
+        /// Initializes a new instance of <see cref="ExceptionHandlingResultModel"/> from an ASP.NET Core
+        /// <see cref="ModelStateDictionary"/>, producing a 400-level validation error response.
+        /// </summary>
+        /// <param name="errors">The model state dictionary containing validation errors.</param>
+        public ExceptionHandlingResultModel(ModelStateDictionary errors)
+        {
+            this.ErrorCode = 400;
+            this.Message = "Validation Failed";
+            this.Errors = errors.Keys
+                .SelectMany(key => errors[key].Errors.Select(x => new ExceptionOrValidationError(key, x.ErrorMessage)))
+                .ToList();
+        }
+
+        /// <summary>
+        /// Serializes this instance to a camel-case JSON string.
+        /// </summary>
+        /// <returns>A JSON representation of this result model.</returns>
+        public override string ToString()
+        {
+            return JsonSerializer.Serialize(this, typeof(ExceptionHandlingResultModel), new JsonSerializerOptions
+            {
+                PropertyNamingPolicy = JsonNamingPolicy.CamelCase,
+                WriteIndented = true
+            });
+        }
+    }
+}
diff --git a/src/TailoredApps.Shared.ExceptionHandling/Model/ExceptionOrValidationError.cs b/src/TailoredApps.Shared.ExceptionHandling/Model/ExceptionOrValidationError.cs
index c18674f..db3f528 100644
--- a/src/TailoredApps.Shared.ExceptionHandling/Model/ExceptionOrValidationError.cs
+++ b/src/TailoredApps.Shared.ExceptionHandling/Model/ExceptionOrValidationError.cs
@@ -1,32 +1,32 @@
-using System.Text.Json.Serialization;
-
-namespace TailoredApps.Shared.ExceptionHandling.Model
-{
-    /// <summary>
-    /// Represents a single error or validation failure, optionally associated with a specific field.
-    /// </summary>
-    public class ExceptionOrValidationError
-    {
-        /// <summary>
-        /// Gets the name of the field that caused the error, or <c>null</c> when the error is not field-specific.
-        /// </summary>
-        [JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingNull)]
-        public string Field { get; }
-
-        /// <summary>
-        /// Gets the human-readable error message describing what went wrong.
-        /// </summary>
-        public string Message { get; }
-
-        /// <summary>
-        /// Initializes a new instance of <see cref="ExceptionOrValidationError"/>.
-        /// </summary>
-        /// <param name="field">The field name associated with the error; pass an empty string for non-field errors.</param>
-        /// <param name="errorMessage">The human-readable error message.</param>
-        public ExceptionOrValidationError(string field, string errorMessage)
-        {
-            Field = field != string.Empty ? field : null;
-            Message = errorMessage;
-        }
-    }
-}
+using System.Text.Json.Serialization;
+
+namespace TailoredApps.Shared.ExceptionHandling.Model
+{
+    /// <summary>
+    /// Represents a single error or validation failure, optionally associated with a specific field.
+    /// </summary>
+    public class ExceptionOrValidationError
+    {
+        /// <summary>
+        /// Gets the name of the field that caused the error, or <c>null</c> when the error is not field-specific.
+        /// </summary>
+        [JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingNull)]
+        public string Field { get; }
+
+        /// <summary>
+        /// Gets the human-readable error message describing what went wrong.
+        /// </summary>
+        public string Message { get; }
+
+        /// <summary>
+        /// Initializes a new instance of <see cref="ExceptionOrValidationError"/>.
+        /// </summary>
+        /// <param name="field">The field name associated with the error; pass an empty string for non-field errors.</param>
+        /// <param name="errorMessage">The human-readable error message.</param>
+        public ExceptionOrValidationError(string field, string errorMessage)
+        {
+            Field = field != string.Empty ? field : null;
+            Message = errorMessage;
+        }
+    }
+}
diff --git a/src/TailoredApps.Shared.ExceptionHandling/Providers/DefaultExceptionHandlingProvider.cs b/src/TailoredApps.Shared.ExceptionHandling/Providers/DefaultExceptionHandlingProvider.cs
index f36a447..fa92cc3 100644
--- a/src/TailoredApps.Shared.ExceptionHandling/Providers/DefaultExceptionHandlingProvider.cs
+++ b/src/TailoredApps.Shared.ExceptionHandling/Providers/DefaultExceptionHandlingProvider.cs
@@ -1,61 +1,61 @@
-using FluentValidation;
-using Microsoft.AspNetCore.Mvc.ModelBinding;
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using TailoredApps.Shared.ExceptionHandling.Interfaces;
-using TailoredApps.Shared.ExceptionHandling.Model;
-
-namespace TailoredApps.Shared.ExceptionHandling.Providers
-{
-    /// <summary>
-    /// Default implementation of <see cref="IExceptionHandlingProvider"/> that handles
-    /// FluentValidation <see cref="ValidationException"/> instances and general exceptions,
-    /// converting them into <see cref="ExceptionHandlingResultModel"/> responses.
-    /// </summary>
-    public class DefaultExceptionHandlingProvider : IExceptionHandlingProvider
-    {
-        /// <summary>
-        /// Creates an <see cref="ExceptionHandlingResultModel"/> from the given exception.
-        /// If the root cause is a FluentValidation <see cref="ValidationException"/>,
-        /// individual validation errors are mapped; otherwise the exception message is used.
-        /// </summary>
-        /// <param name="exception">The exception to handle.</param>
-        /// <returns>A result model describing the error.</returns>
-        public ExceptionHandlingResultModel Response(Exception exception)
-        {
-            var sourceException = exception.GetBaseException();
-            var validationException = sourceException as ValidationException;
-            if (validationException != null)
-            {
-                var validationData = validationException.Errors.DistinctBy(x => new { x.PropertyName, x.ErrorMessage }).Select(x => new ExceptionOrValidationError(x.PropertyName, x.ErrorMessage));
-                return new ExceptionHandlingResultModel(validationException.Message, validationData);
-            }
-            else
-            {
-                return new ExceptionHandlingResultModel(sourceException.Message, new List<ExceptionOrValidationError>(new[] {
-                new ExceptionOrValidationError("",exception.Message)
-            }));
-            }
-        }
-
-        /// <summary>
-        /// Creates an <see cref="ExceptionHandlingResultModel"/> from an invalid model state.
-        /// </summary>
-        /// <param name="modelState">The model state dictionary containing validation errors.</param>
-        /// <returns>A result model describing the validation errors.</returns>
-        public ExceptionHandlingResultModel Response(ModelStateDictionary modelState)
-        {
-            return new ExceptionHandlingResultModel(modelState);
-        }
-    }
-
-    internal static class LinqExceptionHelper
-    {
-        internal static IEnumerable<TSource> DistinctBy<TSource, TKey>(this IEnumerable<TSource> source, Func<TSource, TKey> keySelector)
-        {
-            var known = new HashSet<TKey>();
-            return source.Where(element => known.Add(keySelector(element)));
-        }
-    }
-}
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using FluentValidation;
+using Microsoft.AspNetCore.Mvc.ModelBinding;
+using TailoredApps.Shared.ExceptionHandling.Interfaces;
+using TailoredApps.Shared.ExceptionHandling.Model;
+
+namespace TailoredApps.Shared.ExceptionHandling.Providers
+{
+    /// <summary>
+    /// Default implementation of <see cref="IExceptionHandlingProvider"/> that handles
+    /// FluentValidation <see cref="ValidationException"/> instances and general exceptions,
+    /// converting them into <see cref="ExceptionHandlingResultModel"/> responses.
+    /// </summary>
+    public class DefaultExceptionHandlingProvider : IExceptionHandlingProvider
+    {
+        /// <summary>
+        /// Creates an <see cref="ExceptionHandlingResultModel"/> from the given exception.
+        /// If the root cause is a FluentValidation <see cref="ValidationException"/>,
+        /// individual validation errors are mapped; otherwise the exception message is used.
+        /// </summary>
+        /// <param name="exception">The exception to handle.</param>
+        /// <returns>A result model describing the error.</returns>
+        public ExceptionHandlingResultModel Response(Exception exception)
+        {
+            var sourceException = exception.GetBaseException();
+            var validationException = sourceException as ValidationException;
+            if (validationException != null)
+            {
+                var validationData = validationException.Errors.DistinctBy(x => new { x.PropertyName, x.ErrorMessage }).Select(x => new ExceptionOrValidationError(x.PropertyName, x.ErrorMessage));
+                return new ExceptionHandlingResultModel(validationException.Message, validationData);
+            }
+            else
+            {
+                return new ExceptionHandlingResultModel(sourceException.Message, new List<ExceptionOrValidationError>(new[] {
+                new ExceptionOrValidationError("",exception.Message)
+            }));
+            }
+        }
+
+        /// <summary>
+        /// Creates an <see cref="ExceptionHandlingResultModel"/> from an invalid model state.
+        /// </summary>
+        /// <param name="modelState">The model state dictionary containing validation errors.</param>
+        /// <returns>A result model describing the validation errors.</returns>
+        public ExceptionHandlingResultModel Response(ModelStateDictionary modelState)
+        {
+            return new ExceptionHandlingResultModel(modelState);
+        }
+    }
+
+    internal static class LinqExceptionHelper
+    {
+        internal static IEnumerable<TSource> DistinctBy<TSource, TKey>(this IEnumerable<TSource> source, Func<TSource, TKey> keySelector)
+        {
+            var known = new HashSet<TKey>();
+            return source.Where(element => known.Add(keySelector(element)));
+        }
+    }
+}
diff --git a/src/TailoredApps.Shared.ExceptionHandling/WebApiCore/Attributes/HandleExceptionAttribute.cs b/src/TailoredApps.Shared.ExceptionHandling/WebApiCore/Attributes/HandleExceptionAttribute.cs
index fc930c6..69af8e5 100644
--- a/src/TailoredApps.Shared.ExceptionHandling/WebApiCore/Attributes/HandleExceptionAttribute.cs
+++ b/src/TailoredApps.Shared.ExceptionHandling/WebApiCore/Attributes/HandleExceptionAttribute.cs
@@ -1,20 +1,20 @@
-using System;
-
-namespace TailoredApps.Shared.ExceptionHandling.WebApiCore.Attributes
-{
-    /// <summary>
-    /// Marks a controller action (or an entire controller) as eligible for automatic exception
-    /// and model-state validation handling by <see cref="Filters.HandleExceptionFilterAttribute"/>.
-    /// </summary>
-    [AttributeUsage(AttributeTargets.Class | AttributeTargets.Method, AllowMultiple = false, Inherited = true)]
-    public class HandleExceptionAttribute : Attribute
-    {
-        /// <summary>
-        /// Initializes a new instance of <see cref="HandleExceptionAttribute"/>.
-        /// </summary>
-        public HandleExceptionAttribute()
-        {
-
-        }
-    }
-}
+using System;
+
+namespace TailoredApps.Shared.ExceptionHandling.WebApiCore.Attributes
+{
+    /// <summary>
+    /// Marks a controller action (or an entire controller) as eligible for automatic exception
+    /// and model-state validation handling by <see cref="Filters.HandleExceptionFilterAttribute"/>.
+    /// </summary>
+    [AttributeUsage(AttributeTargets.Class | AttributeTargets.Method, AllowMultiple = false, Inherited = true)]
+    public class HandleExceptionAttribute : Attribute
+    {
+        /// <summary>
+        /// Initializes a new instance of <see cref="HandleExceptionAttribute"/>.
+        /// </summary>
+        public HandleExceptionAttribute()
+        {
+
+        }
+    }
+}
diff --git a/src/TailoredApps.Shared.ExceptionHandling/WebApiCore/ExceptionHandlingConfiguration.cs b/src/TailoredApps.Shared.ExceptionHandling/WebApiCore/ExceptionHandlingConfiguration.cs
index cef3858..8d62740 100644
--- a/src/TailoredApps.Shared.ExceptionHandling/WebApiCore/ExceptionHandlingConfiguration.cs
+++ b/src/TailoredApps.Shared.ExceptionHandling/WebApiCore/ExceptionHandlingConfiguration.cs
@@ -1,44 +1,44 @@
-using Microsoft.AspNetCore.Mvc.Filters;
-using Microsoft.Extensions.DependencyInjection;
-using TailoredApps.Shared.ExceptionHandling.Interfaces;
-using TailoredApps.Shared.ExceptionHandling.WebApiCore.Attributes;
-using TailoredApps.Shared.ExceptionHandling.WebApiCore.Filters;
-
-namespace TailoredApps.Shared.ExceptionHandling.WebApiCore
-{
-    /// <summary>
-    /// Provides extension methods to register exception handling services for ASP.NET Core Web API projects.
-    /// </summary>
-    public static class ExceptionHandlingConfiguration
-    {
-        /// <summary>
-        /// Registers exception handling services, the <see cref="HandleExceptionAttribute"/> filter,
-        /// and the specified exception-handling provider into the DI container.
-        /// </summary>
-        /// <typeparam name="TExceptionHandlingProviderInterface">
-        /// The interface type of the exception handling provider.
-        /// </typeparam>
-        /// <typeparam name="TTExceptionHandlingProvider">
-        /// The concrete implementation type of the exception handling provider.
-        /// </typeparam>
-        /// <param name="service">The service collection to register into.</param>
-        /// <returns>An <see cref="IExceptionHandlingOptionsBuilder"/> for further configuration.</returns>
-        public static IExceptionHandlingOptionsBuilder AddExceptionHandlingForWebApi<TExceptionHandlingProviderInterface, TTExceptionHandlingProvider>(this IServiceCollection service)
-            where TTExceptionHandlingProvider : class, TExceptionHandlingProviderInterface
-            where TExceptionHandlingProviderInterface : class, IExceptionHandlingProvider
-        {
-            service.AddScoped<HandleExceptionAttribute>();
-            return service.AddExceptionHandling<TExceptionHandlingProviderInterface, TTExceptionHandlingProvider>();
-        }
-
-        /// <summary>
-        /// Adds <see cref="HandleExceptionFilterAttribute"/> as a global MVC filter so that all
-        /// actions decorated with <see cref="HandleExceptionAttribute"/> are automatically handled.
-        /// </summary>
-        /// <param name="filter">The global filter collection.</param>
-        public static void AddExceptionHAndlingFilterAttribute(this FilterCollection filter)
-        {
-            filter.Add<HandleExceptionFilterAttribute>();
-        }
-    }
-}
+using Microsoft.AspNetCore.Mvc.Filters;
+using Microsoft.Extensions.DependencyInjection;
+using TailoredApps.Shared.ExceptionHandling.Interfaces;
+using TailoredApps.Shared.ExceptionHandling.WebApiCore.Attributes;
+using TailoredApps.Shared.ExceptionHandling.WebApiCore.Filters;
+
+namespace TailoredApps.Shared.ExceptionHandling.WebApiCore
+{
+    /// <summary>
+    /// Provides extension methods to register exception handling services for ASP.NET Core Web API projects.
+    /// </summary>
+    public static class ExceptionHandlingConfiguration
+    {
+        /// <summary>
+        /// Registers exception handling services, the <see cref="HandleExceptionAttribute"/> filter,
+        /// and the specified exception-handling provider into the DI container.
+        /// </summary>
+        /// <typeparam name="TExceptionHandlingProviderInterface">
+        /// The interface type of the exception handling provider.
+        /// </typeparam>
+        /// <typeparam name="TTExceptionHandlingProvider">
+        /// The concrete implementation type of the exception handling provider.
+        /// </typeparam>
+        /// <param name="service">The service collection to register into.</param>
+        /// <returns>An <see cref="IExceptionHandlingOptionsBuilder"/> for further configuration.</returns>
+        public static IExceptionHandlingOptionsBuilder AddExceptionHandlingForWebApi<TExceptionHandlingProviderInterface, TTExceptionHandlingProvider>(this IServiceCollection service)
+            where TTExceptionHandlingProvider : class, TExceptionHandlingProviderInterface
+            where TExceptionHandlingProviderInterface : class, IExceptionHandlingProvider
+        {
+            service.AddScoped<HandleExceptionAttribute>();
+            return service.AddExceptionHandling<TExceptionHandlingProviderInterface, TTExceptionHandlingProvider>();
+        }
+
+        /// <summary>
+        /// Adds <see cref="HandleExceptionFilterAttribute"/> as a global MVC filter so that all
+        /// actions decorated with <see cref="HandleExceptionAttribute"/> are automatically handled.
+        /// </summary>
+        /// <param name="filter">The global filter collection.</param>
+        public static void AddExceptionHAndlingFilterAttribute(this FilterCollection filter)
+        {
+            filter.Add<HandleExceptionFilterAttribute>();
+        }
+    }
+}
diff --git a/src/TailoredApps.Shared.ExceptionHandling/WebApiCore/ExceptionHandlingOptionsBuilder.cs b/src/TailoredApps.Shared.ExceptionHandling/WebApiCore/ExceptionHandlingOptionsBuilder.cs
index 28787ac..c81c7e7 100644
--- a/src/TailoredApps.Shared.ExceptionHandling/WebApiCore/ExceptionHandlingOptionsBuilder.cs
+++ b/src/TailoredApps.Shared.ExceptionHandling/WebApiCore/ExceptionHandlingOptionsBuilder.cs
@@ -1,65 +1,65 @@
-using Microsoft.Extensions.DependencyInjection;
-using System;
-using TailoredApps.Shared.ExceptionHandling.Interfaces;
-
-namespace TailoredApps.Shared.ExceptionHandling.WebApiCore
-{
-    /// <summary>
-    /// Fluent builder for configuring exception handling providers after the core services have been registered.
-    /// </summary>
-    public class ExceptionHandlingOptionsBuilder : IExceptionHandlingOptionsBuilder
-    {
-        /// <summary>
-        /// Gets the underlying <see cref="IServiceCollection"/> used for DI registrations.
-        /// </summary>
-        public IServiceCollection Services { get; private set; }
-
-        /// <summary>
-        /// Initializes a new instance of <see cref="ExceptionHandlingOptionsBuilder"/>.
-        /// </summary>
-        /// <param name="services">The service collection to register providers into.</param>
-        public ExceptionHandlingOptionsBuilder(IServiceCollection services)
-        {
-            this.Services = services;
-        }
-
-        /// <summary>
-        /// Registers an additional <see cref="IExceptionHandlingProvider"/> implementation as a transient service.
-        /// </summary>
-        /// <typeparam name="Provider">The concrete provider type to register.</typeparam>
-        /// <returns>The current builder instance for further chaining.</returns>
-        public IExceptionHandlingOptionsBuilder WithExceptionHandlingProvider<Provider>() where Provider : class, IExceptionHandlingProvider
-        {
-            Services.AddTransient<IExceptionHandlingProvider, Provider>();
-            return this;
-        }
-
-        /// <summary>
-        /// Registers an additional <see cref="IExceptionHandlingProvider"/> implementation using a factory delegate.
-        /// </summary>
-        /// <typeparam name="Provider">The concrete provider type to register.</typeparam>
-        /// <param name="implementationFactory">A factory delegate that creates the provider instance.</param>
-        /// <returns>The current builder instance for further chaining.</returns>
-        public IExceptionHandlingOptionsBuilder WithExceptionHandlingProvider<Provider>(Func<IServiceProvider, Provider> implementationFactory) where Provider : class, IExceptionHandlingProvider
-        {
-            Services.AddTransient<IExceptionHandlingProvider, Provider>(implementationFactory);
-            return this;
-        }
-    }
-
-    internal static class ExceptionHandlingOptionsBuilderExtensions
-    {
-        public static IExceptionHandlingOptionsBuilder AddExceptionHandling<TTargetExceptionHandlingProviderInterface, TTargetExceptionHandlingProvider>(this IServiceCollection services)
-            where TTargetExceptionHandlingProvider : class, TTargetExceptionHandlingProviderInterface
-            where TTargetExceptionHandlingProviderInterface : class, IExceptionHandlingProvider
-        {
-            services.AddTransient<TTargetExceptionHandlingProviderInterface, TTargetExceptionHandlingProvider>(container => container.GetRequiredService<TTargetExceptionHandlingProvider>());
-
-            services.AddScoped<IExceptionHandlingService, ExceptionHandlingService<TTargetExceptionHandlingProvider>>();
-            services.AddTransient<TTargetExceptionHandlingProviderInterface, TTargetExceptionHandlingProvider>();
-            services.AddTransient<TTargetExceptionHandlingProvider, TTargetExceptionHandlingProvider>();
-
-            return new ExceptionHandlingOptionsBuilder(services);
-        }
-    }
-}
+using System;
+using Microsoft.Extensions.DependencyInjection;
+using TailoredApps.Shared.ExceptionHandling.Interfaces;
+
+namespace TailoredApps.Shared.ExceptionHandling.WebApiCore
+{
+    /// <summary>
+    /// Fluent builder for configuring exception handling providers after the core services have been registered.
+    /// </summary>
+    public class ExceptionHandlingOptionsBuilder : IExceptionHandlingOptionsBuilder
+    {
+        /// <summary>
+        /// Gets the underlying <see cref="IServiceCollection"/> used for DI registrations.
+        /// </summary>
+        public IServiceCollection Services { get; private set; }
+
+        /// <summary>
+        /// Initializes a new instance of <see cref="ExceptionHandlingOptionsBuilder"/>.
+        /// </summary>
+        /// <param name="services">The service collection to register providers into.</param>
+        public ExceptionHandlingOptionsBuilder(IServiceCollection services)
+        {
+            this.Services = services;
+        }
+
+        /// <summary>
+        /// Registers an additional <see cref="IExceptionHandlingProvider"/> implementation as a transient service.
+        /// </summary>
+        /// <typeparam name="Provider">The concrete provider type to register.</typeparam>
+        /// <returns>The current builder instance for further chaining.</returns>
+        public IExceptionHandlingOptionsBuilder WithExceptionHandlingProvider<Provider>() where Provider : class, IExceptionHandlingProvider
+        {
+            Services.AddTransient<IExceptionHandlingProvider, Provider>();
+            return this;
+        }
+
+        /// <summary>
+        /// Registers an additional <see cref="IExceptionHandlingProvider"/> implementation using a factory delegate.
+        /// </summary>
+        /// <typeparam name="Provider">The concrete provider type to register.</typeparam>
+        /// <param name="implementationFactory">A factory delegate that creates the provider instance.</param>
+        /// <returns>The current builder instance for further chaining.</returns>
+        public IExceptionHandlingOptionsBuilder WithExceptionHandlingProvider<Provider>(Func<IServiceProvider, Provider> implementationFactory) where Provider : class, IExceptionHandlingProvider
+        {
+            Services.AddTransient<IExceptionHandlingProvider, Provider>(implementationFactory);
+            return this;
+        }
+    }
+
+    internal static class ExceptionHandlingOptionsBuilderExtensions
+    {
+        public static IExceptionHandlingOptionsBuilder AddExceptionHandling<TTargetExceptionHandlingProviderInterface, TTargetExceptionHandlingProvider>(this IServiceCollection services)
+            where TTargetExceptionHandlingProvider : class, TTargetExceptionHandlingProviderInterface
+            where TTargetExceptionHandlingProviderInterface : class, IExceptionHandlingProvider
+        {
+            services.AddTransient<TTargetExceptionHandlingProviderInterface, TTargetExceptionHandlingProvider>(container => container.GetRequiredService<TTargetExceptionHandlingProvider>());
+
+            services.AddScoped<IExceptionHandlingService, ExceptionHandlingService<TTargetExceptionHandlingProvider>>();
+            services.AddTransient<TTargetExceptionHandlingProviderInterface, TTargetExceptionHandlingProvider>();
+            services.AddTransient<TTargetExceptionHandlingProvider, TTargetExceptionHandlingProvider>();
+
+            return new ExceptionHandlingOptionsBuilder(services);
+        }
+    }
+}
diff --git a/src/TailoredApps.Shared.ExceptionHandling/WebApiCore/ExceptionHandlingService.cs b/src/TailoredApps.Shared.ExceptionHandling/WebApiCore/ExceptionHandlingService.cs
index b6a1153..581f71f 100644
--- a/src/TailoredApps.Shared.ExceptionHandling/WebApiCore/ExceptionHandlingService.cs
+++ b/src/TailoredApps.Shared.ExceptionHandling/WebApiCore/ExceptionHandlingService.cs
@@ -1,51 +1,51 @@
-using Microsoft.AspNetCore.Mvc.ModelBinding;
-using System;
-using TailoredApps.Shared.ExceptionHandling.Interfaces;
-using TailoredApps.Shared.ExceptionHandling.Model;
-
-namespace TailoredApps.Shared.ExceptionHandling.WebApiCore
-{
-    /// <summary>
-    /// Generic implementation of <see cref="IExceptionHandlingService{T}"/> that delegates
-    /// exception and model-state handling to an <see cref="IExceptionHandlingProvider"/> of type <typeparamref name="T"/>.
-    /// </summary>
-    /// <typeparam name="T">The type of the exception handling provider.</typeparam>
-    public class ExceptionHandlingService<T> : IExceptionHandlingService<T> where T : IExceptionHandlingProvider
-    {
-        /// <summary>
-        /// Initializes a new instance of <see cref="ExceptionHandlingService{T}"/>.
-        /// </summary>
-        /// <param name="exceptionHandlingProvider">The provider used to produce error response models.</param>
-        public ExceptionHandlingService(T exceptionHandlingProvider)
-        {
-            this.ExceptionHandlingProvider = exceptionHandlingProvider;
-        }
-
-        /// <summary>
-        /// Gets the concrete exception handling provider used by this service.
-        /// </summary>
-        public T ExceptionHandlingProvider { get; private set; }
-
-        /// <summary>
-        /// Creates an <see cref="ExceptionHandlingResultModel"/> from the given exception
-        /// by delegating to <see cref="ExceptionHandlingProvider"/>.
-        /// </summary>
-        /// <param name="exception">The exception to handle.</param>
-        /// <returns>A result model describing the error.</returns>
-        public ExceptionHandlingResultModel Response(Exception exception)
-        {
-            return ExceptionHandlingProvider.Response(exception);
-        }
-
-        /// <summary>
-        /// Creates an <see cref="ExceptionHandlingResultModel"/> from an invalid model state
-        /// by delegating to <see cref="ExceptionHandlingProvider"/>.
-        /// </summary>
-        /// <param name="modelState">The model state dictionary containing validation errors.</param>
-        /// <returns>A result model describing the validation errors.</returns>
-        public ExceptionHandlingResultModel Response(ModelStateDictionary modelState)
-        {
-            return ExceptionHandlingProvider.Response(modelState);
-        }
-    }
-}
+using System;
+using Microsoft.AspNetCore.Mvc.ModelBinding;
+using TailoredApps.Shared.ExceptionHandling.Interfaces;
+using TailoredApps.Shared.ExceptionHandling.Model;
+
+namespace TailoredApps.Shared.ExceptionHandling.WebApiCore
+{
+    /// <summary>
+    /// Generic implementation of <see cref="IExceptionHandlingService{T}"/> that delegates
+    /// exception and model-state handling to an <see cref="IExceptionHandlingProvider"/> of type <typeparamref name="T"/>.
+    /// </summary>
+    /// <typeparam name="T">The type of the exception handling provider.</typeparam>
+    public class ExceptionHandlingService<T> : IExceptionHandlingService<T> where T : IExceptionHandlingProvider
+    {
+        /// <summary>
+        /// Initializes a new instance of <see cref="ExceptionHandlingService{T}"/>.
+        /// </summary>
+        /// <param name="exceptionHandlingProvider">The provider used to produce error response models.</param>
+        public ExceptionHandlingService(T exceptionHandlingProvider)
+        {
+            this.ExceptionHandlingProvider = exceptionHandlingProvider;
+        }
+
+        /// <summary>
+        /// Gets the concrete exception handling provider used by this service.
+        /// </summary>
+        public T ExceptionHandlingProvider { get; private set; }
+
+        /// <summary>
+        /// Creates an <see cref="ExceptionHandlingResultModel"/> from the given exception
+        /// by delegating to <see cref="ExceptionHandlingProvider"/>.
+        /// </summary>
+        /// <param name="exception">The exception to handle.</param>
+        /// <returns>A result model describing the error.</returns>
+        public ExceptionHandlingResultModel Response(Exception exception)
+        {
+            return ExceptionHandlingProvider.Response(exception);
+        }
+
+        /// <summary>
+        /// Creates an <see cref="ExceptionHandlingResultModel"/> from an invalid model state
+        /// by delegating to <see cref="ExceptionHandlingProvider"/>.
+        /// </summary>
+        /// <param name="modelState">The model state dictionary containing validation errors.</param>
+        /// <returns>A result model describing the validation errors.</returns>
+        public ExceptionHandlingResultModel Response(ModelStateDictionary modelState)
+        {
+            return ExceptionHandlingProvider.Response(modelState);
+        }
+    }
+}
diff --git a/src/TailoredApps.Shared.ExceptionHandling/WebApiCore/Filters/HandleExceptionFilterAttribute.cs b/src/TailoredApps.Shared.ExceptionHandling/WebApiCore/Filters/HandleExceptionFilterAttribute.cs
index b505ed0..23afc4d 100644
--- a/src/TailoredApps.Shared.ExceptionHandling/WebApiCore/Filters/HandleExceptionFilterAttribute.cs
+++ b/src/TailoredApps.Shared.ExceptionHandling/WebApiCore/Filters/HandleExceptionFilterAttribute.cs
@@ -1,71 +1,71 @@
-using Microsoft.AspNetCore.Mvc.Controllers;
-using Microsoft.AspNetCore.Mvc.Filters;
-using System.Reflection;
-using TailoredApps.Shared.ExceptionHandling.HttpResult;
-using TailoredApps.Shared.ExceptionHandling.Interfaces;
-using TailoredApps.Shared.ExceptionHandling.WebApiCore.Attributes;
-
-namespace TailoredApps.Shared.ExceptionHandling.WebApiCore.Filters
-{
-    /// <summary>
-    /// MVC action filter that intercepts actions decorated with <see cref="HandleExceptionAttribute"/>
-    /// and automatically returns a structured error response when the model state is invalid.
-    /// </summary>
-    public class HandleExceptionFilterAttribute : ActionFilterAttribute
-    {
-        private readonly IExceptionHandlingService exceptionHandlingService;
-
-        /// <summary>
-        /// Initializes a new instance of <see cref="HandleExceptionFilterAttribute"/>.
-        /// </summary>
-        /// <param name="exceptionHandlingService">
-        /// The service used to convert model-state errors into structured responses.
-        /// </param>
-        public HandleExceptionFilterAttribute(IExceptionHandlingService exceptionHandlingService)
-        {
-            this.exceptionHandlingService = exceptionHandlingService;
-        }
-
-        /// <summary>
-        /// Called before the action executes. If the action has <see cref="HandleExceptionAttribute"/>
-        /// and the model state is invalid, the action result is short-circuited with an error response.
-        /// </summary>
-        /// <param name="actionContext">The context for the executing action.</param>
-        public override void OnActionExecuting(ActionExecutingContext actionContext)
-        {
-            var controllerActionDescriptor = actionContext.ActionDescriptor as ControllerActionDescriptor;
-            var handleExceptionAttribute = controllerActionDescriptor?.MethodInfo
-                .GetCustomAttribute<HandleExceptionAttribute>(true);
-
-            if (handleExceptionAttribute != null)
-            {
-                if (!actionContext.ModelState.IsValid)
-                {
-                    actionContext.Result = new ExceptionOccuredResult(exceptionHandlingService.Response(actionContext.ModelState));
-                }
-            }
-            base.OnActionExecuting(actionContext);
-        }
-
-        /// <summary>
-        /// Called after the action executes. If the action has <see cref="HandleExceptionAttribute"/>
-        /// and the model state is invalid, the result is replaced with a structured error response.
-        /// </summary>
-        /// <param name="actionContext">The context for the executed action.</param>
-        public override void OnActionExecuted(ActionExecutedContext actionContext)
-        {
-            var controllerActionDescriptor = actionContext.ActionDescriptor as ControllerActionDescriptor;
-            var handleExceptionAttribute = controllerActionDescriptor?.MethodInfo
-                .GetCustomAttribute<HandleExceptionAttribute>(true);
-
-            if (handleExceptionAttribute != null)
-            {
-                if (!actionContext.ModelState.IsValid)
-                {
-                    actionContext.Result = new ExceptionOccuredResult(exceptionHandlingService.Response(actionContext.ModelState));
-                }
-            }
-            base.OnActionExecuted(actionContext);
-        }
-    }
-}
+using System.Reflection;
+using Microsoft.AspNetCore.Mvc.Controllers;
+using Microsoft.AspNetCore.Mvc.Filters;
+using TailoredApps.Shared.ExceptionHandling.HttpResult;
+using TailoredApps.Shared.ExceptionHandling.Interfaces;
+using TailoredApps.Shared.ExceptionHandling.WebApiCore.Attributes;
+
+namespace TailoredApps.Shared.ExceptionHandling.WebApiCore.Filters
+{
+    /// <summary>
+    /// MVC action filter that intercepts actions decorated with <see cref="HandleExceptionAttribute"/>
+    /// and automatically returns a structured error response when the model state is invalid.
+    /// </summary>
+    public class HandleExceptionFilterAttribute : ActionFilterAttribute
+    {
+        private readonly IExceptionHandlingService exceptionHandlingService;
+
+        /// <summary>
+        /// Initializes a new instance of <see cref="HandleExceptionFilterAttribute"/>.
+        /// </summary>
+        /// <param name="exceptionHandlingService">
+        /// The service used to convert model-state errors into structured responses.
+        /// </param>
+        public HandleExceptionFilterAttribute(IExceptionHandlingService exceptionHandlingService)
+        {
+            this.exceptionHandlingService = exceptionHandlingService;
+        }
+
+        /// <summary>
+        /// Called before the action executes. If the action has <see cref="HandleExceptionAttribute"/>
+        /// and the model state is invalid, the action result is short-circuited with an error response.
+        /// </summary>
+        /// <param name="actionContext">The context for the executing action.</param>
+        public override void OnActionExecuting(ActionExecutingContext actionContext)
+        {
+            var controllerActionDescriptor = actionContext.ActionDescriptor as ControllerActionDescriptor;
+            var handleExceptionAttribute = controllerActionDescriptor?.MethodInfo
+                .GetCustomAttribute<HandleExceptionAttribute>(true);
+
+            if (handleExceptionAttribute != null)
+            {
+                if (!actionContext.ModelState.IsValid)
+                {
+                    actionContext.Result = new ExceptionOccuredResult(exceptionHandlingService.Response(actionContext.ModelState));
+                }
+            }
+            base.OnActionExecuting(actionContext);
+        }
+
+        /// <summary>
+        /// Called after the action executes. If the action has <see cref="HandleExceptionAttribute"/>
+        /// and the model state is invalid, the result is replaced with a structured error response.
+        /// </summary>
+        /// <param name="actionContext">The context for the executed action.</param>
+        public override void OnActionExecuted(ActionExecutedContext actionContext)
+        {
+            var controllerActionDescriptor = actionContext.ActionDescriptor as ControllerActionDescriptor;
+            var handleExceptionAttribute = controllerActionDescriptor?.MethodInfo
+                .GetCustomAttribute<HandleExceptionAttribute>(true);
+
+            if (handleExceptionAttribute != null)
+            {
+                if (!actionContext.ModelState.IsValid)
+                {
+                    actionContext.Result = new ExceptionOccuredResult(exceptionHandlingService.Response(actionContext.ModelState));
+                }
+            }
+            base.OnActionExecuted(actionContext);
+        }
+    }
+}
diff --git a/src/TailoredApps.Shared.ExceptionHandling/WebApiCore/Middleware/ExceptionMiddlewareExtensions.cs b/src/TailoredApps.Shared.ExceptionHandling/WebApiCore/Middleware/ExceptionMiddlewareExtensions.cs
index 10b92a6..21ac30d 100644
--- a/src/TailoredApps.Shared.ExceptionHandling/WebApiCore/Middleware/ExceptionMiddlewareExtensions.cs
+++ b/src/TailoredApps.Shared.ExceptionHandling/WebApiCore/Middleware/ExceptionMiddlewareExtensions.cs
@@ -1,42 +1,42 @@
-using Microsoft.AspNetCore.Builder;
-using Microsoft.AspNetCore.Diagnostics;
-using Microsoft.AspNetCore.Http;
-using System.Net;
-using TailoredApps.Shared.ExceptionHandling.Interfaces;
-
-namespace TailoredApps.Shared.ExceptionHandling.WebApiCore.Middleware
-{
-    /// <summary>
-    /// Provides extension methods for registering the global exception-handling middleware
-    /// into the ASP.NET Core request pipeline.
-    /// </summary>
-    public static class ExceptionMiddlewareExtensions
-    {
-        /// <summary>
-        /// Registers a global exception handler that catches unhandled exceptions, converts them
-        /// to a structured JSON response using the registered <see cref="IExceptionHandlingService"/>,
-        /// and writes the appropriate HTTP status code.
-        /// </summary>
-        /// <param name="app">The application builder to add the exception handler to.</param>
-        public static void ConfigureExceptionHandler(this IApplicationBuilder app)
-        {
-            app.UseExceptionHandler(appError =>
-            {
-                appError.Run(async context =>
-                {
-                    context.Response.StatusCode = (int)HttpStatusCode.InternalServerError;
-                    context.Response.ContentType = "application/json";
-                    var contextFeature = context.Features.Get<IExceptionHandlerFeature>();
-
-                    if (contextFeature != null)
-                    {
-                        var exceptionHandlingService = context.RequestServices.GetService(typeof(IExceptionHandlingService)) as IExceptionHandlingService;
-                        var response = exceptionHandlingService.Response(contextFeature.Error);
-                        context.Response.StatusCode = response.ErrorCode;
-                        await context.Response.WriteAsync(response.ToString());
-                    }
-                });
-            });
-        }
-    }
-}
+using System.Net;
+using Microsoft.AspNetCore.Builder;
+using Microsoft.AspNetCore.Diagnostics;
+using Microsoft.AspNetCore.Http;
+using TailoredApps.Shared.ExceptionHandling.Interfaces;
+
+namespace TailoredApps.Shared.ExceptionHandling.WebApiCore.Middleware
+{
+    /// <summary>
+    /// Provides extension methods for registering the global exception-handling middleware
+    /// into the ASP.NET Core request pipeline.
+    /// </summary>
+    public static class ExceptionMiddlewareExtensions
+    {
+        /// <summary>
+        /// Registers a global exception handler that catches unhandled exceptions, converts them
+        /// to a structured JSON response using the registered <see cref="IExceptionHandlingService"/>,
+        /// and writes the appropriate HTTP status code.
+        /// </summary>
+        /// <param name="app">The application builder to add the exception handler to.</param>
+        public static void ConfigureExceptionHandler(this IApplicationBuilder app)
+        {
+            app.UseExceptionHandler(appError =>
+            {
+                appError.Run(async context =>
+                {
+                    context.Response.StatusCode = (int)HttpStatusCode.InternalServerError;
+                    context.Response.ContentType = "application/json";
+                    var contextFeature = context.Features.Get<IExceptionHandlerFeature>();
+
+                    if (contextFeature != null)
+                    {
+                        var exceptionHandlingService = context.RequestServices.GetService(typeof(IExceptionHandlingService)) as IExceptionHandlingService;
+                        var response = exceptionHandlingService.Response(contextFeature.Error);
+                        context.Response.StatusCode = response.ErrorCode;
+                        await context.Response.WriteAsync(response.ToString());
+                    }
+                });
+            });
+        }
+    }
+}
diff --git a/src/TailoredApps.Shared.MediatR.Caching/ICachableRequest.cs b/src/TailoredApps.Shared.MediatR.Caching/ICachableRequest.cs
index 669a9f1..01b1b44 100644
--- a/src/TailoredApps.Shared.MediatR.Caching/ICachableRequest.cs
+++ b/src/TailoredApps.Shared.MediatR.Caching/ICachableRequest.cs
@@ -1,12 +1,12 @@
-using MediatR;
-
-namespace TailoredApps.Shared.MediatR.Caching
-{
-    /// <summary>Marker interfejsu dla żądań MediatR, których wynik może być cachowany.</summary>
-    /// <typeparam name="TResponse">Typ odpowiedzi.</typeparam>
-    public interface ICachableRequest<TResponse> : IRequest<TResponse>
-    {
-        /// <summary>Zwraca klucz cache dla tego żądania.</summary>
-        string GetCacheKey();
-    }
-}
+using MediatR;
+
+namespace TailoredApps.Shared.MediatR.Caching
+{
+    /// <summary>Marker interfejsu dla żądań MediatR, których wynik może być cachowany.</summary>
+    /// <typeparam name="TResponse">Typ odpowiedzi.</typeparam>
+    public interface ICachableRequest<TResponse> : IRequest<TResponse>
+    {
+        /// <summary>Zwraca klucz cache dla tego żądania.</summary>
+        string GetCacheKey();
+    }
+}
diff --git a/src/TailoredApps.Shared.MediatR.Email/Handlers/SendMailCommandHandler.cs b/src/TailoredApps.Shared.MediatR.Email/Handlers/SendMailCommandHandler.cs
index 148d52d..01c48d5 100644
--- a/src/TailoredApps.Shared.MediatR.Email/Handlers/SendMailCommandHandler.cs
+++ b/src/TailoredApps.Shared.MediatR.Email/Handlers/SendMailCommandHandler.cs
@@ -1,50 +1,50 @@
-using System.Threading;
-using System.Threading.Tasks;
-using TailoredApps.Shared.Email;
-using TailoredApps.Shared.Email.MailMessageBuilder;
-using TailoredApps.Shared.MediatR.Email.Interfaces.Handlers.Commands;
-using TailoredApps.Shared.MediatR.Email.Messages.Commands;
-using TailoredApps.Shared.MediatR.Email.Responses;
-
-namespace TailoredApps.Shared.MediatR.Email.Handlers
-{
-    /// <summary>
-    /// MediatR request handler that processes a <see cref="SendMail"/> command by building
-    /// the email body from a template and dispatching the message via the configured
-    /// <see cref="IEmailProvider"/>.
-    /// </summary>
-    public class SendMailCommandHandler : ISendMailCommandHandler
-    {
-        private readonly IEmailProvider emailService;
-        private readonly IMailMessageBuilder mailMessageBuilder;
-
-        /// <summary>
-        /// Initializes a new instance of <see cref="SendMailCommandHandler"/>.
-        /// </summary>
-        /// <param name="emailService">The email provider used to send messages.</param>
-        /// <param name="mailMessageBuilder">The builder used to render the email body from a template.</param>
-        public SendMailCommandHandler(IEmailProvider emailService, IMailMessageBuilder mailMessageBuilder)
-        {
-            this.emailService = emailService;
-            this.mailMessageBuilder = mailMessageBuilder;
-        }
-
-        /// <summary>
-        /// Handles the <see cref="SendMail"/> command: renders the email body and sends the message.
-        /// </summary>
-        /// <param name="request">The send-mail command containing recipient, subject, template, and attachments.</param>
-        /// <param name="cancellationToken">A token to cancel the operation.</param>
-        /// <returns>
-        /// A <see cref="SendMailResponse"/> containing the provider-assigned message identifier.
-        /// </returns>
-        public async Task<SendMailResponse> Handle(SendMail request, CancellationToken cancellationToken)
-        {
-
-            var body = mailMessageBuilder.Build(request.Template, request.TemplateVariables, request.Templates);
-            var messageId = await emailService.SendMail(request.Recipent, request.Subject, body, request.Attachments);
-            return new SendMailResponse() { MessageId= messageId };
-
-
-        }
-    }
-}
+using System.Threading;
+using System.Threading.Tasks;
+using TailoredApps.Shared.Email;
+using TailoredApps.Shared.Email.MailMessageBuilder;
+using TailoredApps.Shared.MediatR.Email.Interfaces.Handlers.Commands;
+using TailoredApps.Shared.MediatR.Email.Messages.Commands;
+using TailoredApps.Shared.MediatR.Email.Responses;
+
+namespace TailoredApps.Shared.MediatR.Email.Handlers
+{
+    /// <summary>
+    /// MediatR request handler that processes a <see cref="SendMail"/> command by building
+    /// the email body from a template and dispatching the message via the configured
+    /// <see cref="IEmailProvider"/>.
+    /// </summary>
+    public class SendMailCommandHandler : ISendMailCommandHandler
+    {
+        private readonly IEmailProvider emailService;
+        private readonly IMailMessageBuilder mailMessageBuilder;
+
+        /// <summary>
+        /// Initializes a new instance of <see cref="SendMailCommandHandler"/>.
+        /// </summary>
+        /// <param name="emailService">The email provider used to send messages.</param>
+        /// <param name="mailMessageBuilder">The builder used to render the email body from a template.</param>
+        public SendMailCommandHandler(IEmailProvider emailService, IMailMessageBuilder mailMessageBuilder)
+        {
+            this.emailService = emailService;
+            this.mailMessageBuilder = mailMessageBuilder;
+        }
+
+        /// <summary>
+        /// Handles the <see cref="SendMail"/> command: renders the email body and sends the message.
+        /// </summary>
+        /// <param name="request">The send-mail command containing recipient, subject, template, and attachments.</param>
+        /// <param name="cancellationToken">A token to cancel the operation.</param>
+        /// <returns>
+        /// A <see cref="SendMailResponse"/> containing the provider-assigned message identifier.
+        /// </returns>
+        public async Task<SendMailResponse> Handle(SendMail request, CancellationToken cancellationToken)
+        {
+
+            var body = mailMessageBuilder.Build(request.Template, request.TemplateVariables, request.Templates);
+            var messageId = await emailService.SendMail(request.Recipent, request.Subject, body, request.Attachments);
+            return new SendMailResponse() { MessageId = messageId };
+
+
+        }
+    }
+}
diff --git a/src/TailoredApps.Shared.MediatR.Email/Interfaces/Handlers/Commands/ISendMailCommandHandler.cs b/src/TailoredApps.Shared.MediatR.Email/Interfaces/Handlers/Commands/ISendMailCommandHandler.cs
index 90b0ce2..dac78f4 100644
--- a/src/TailoredApps.Shared.MediatR.Email/Interfaces/Handlers/Commands/ISendMailCommandHandler.cs
+++ b/src/TailoredApps.Shared.MediatR.Email/Interfaces/Handlers/Commands/ISendMailCommandHandler.cs
@@ -1,14 +1,14 @@
-using MediatR;
-using TailoredApps.Shared.MediatR.Email.Messages.Commands;
-using TailoredApps.Shared.MediatR.Email.Responses;
-
-namespace TailoredApps.Shared.MediatR.Email.Interfaces.Handlers.Commands
-{
-    /// <summary>
-    /// Defines the MediatR request handler contract for the <see cref="SendMail"/> command.
-    /// Implementations are responsible for building the email body and dispatching the message.
-    /// </summary>
-    public interface ISendMailCommandHandler : IRequestHandler<SendMail, SendMailResponse>
-    {
-    }
-}
+using MediatR;
+using TailoredApps.Shared.MediatR.Email.Messages.Commands;
+using TailoredApps.Shared.MediatR.Email.Responses;
+
+namespace TailoredApps.Shared.MediatR.Email.Interfaces.Handlers.Commands
+{
+    /// <summary>
+    /// Defines the MediatR request handler contract for the <see cref="SendMail"/> command.
+    /// Implementations are responsible for building the email body and dispatching the message.
+    /// </summary>
+    public interface ISendMailCommandHandler : IRequestHandler<SendMail, SendMailResponse>
+    {
+    }
+}
diff --git a/src/TailoredApps.Shared.MediatR.Email/Messages/Commands/SendMail.cs b/src/TailoredApps.Shared.MediatR.Email/Messages/Commands/SendMail.cs
index c65c1a1..0234a5f 100644
--- a/src/TailoredApps.Shared.MediatR.Email/Messages/Commands/SendMail.cs
+++ b/src/TailoredApps.Shared.MediatR.Email/Messages/Commands/SendMail.cs
@@ -1,43 +1,43 @@
-using MediatR;
-using System.Collections.Generic;
-using TailoredApps.Shared.MediatR.Email.Responses;
-
-namespace TailoredApps.Shared.MediatR.Email.Messages.Commands
-{
-    /// <summary>
-    /// MediatR command that triggers sending an email message.
-    /// Carries all data required by the handler to compose and dispatch the email.
-    /// </summary>
-    public class SendMail : IRequest<SendMailResponse>
-    {
-        /// <summary>
-        /// Gets or sets the email subject line.
-        /// </summary>
-        public string Subject { get; set; }
-
-        /// <summary>
-        /// Gets or sets the recipient's email address.
-        /// </summary>
-        public string Recipent { get; set; }
-
-        /// <summary>
-        /// Gets or sets the name or path of the template to render as the email body.
-        /// </summary>
-        public string Template { get; set; }
-
-        /// <summary>
-        /// Gets or sets a dictionary of file names to binary content for email attachments.
-        /// </summary>
-        public Dictionary<string, byte[]> Attachments { get; set; }
-
-        /// <summary>
-        /// Gets or sets a dictionary of placeholder keys and their values used when rendering the template.
-        /// </summary>
-        public Dictionary<string, string> TemplateVariables { get; set; }
-
-        /// <summary>
-        /// Gets or sets an optional dictionary of named templates passed to the mail message builder.
-        /// </summary>
-        public Dictionary<string, string> Templates { get; set; }
-    }
-}
+using System.Collections.Generic;
+using MediatR;
+using TailoredApps.Shared.MediatR.Email.Responses;
+
+namespace TailoredApps.Shared.MediatR.Email.Messages.Commands
+{
+    /// <summary>
+    /// MediatR command that triggers sending an email message.
+    /// Carries all data required by the handler to compose and dispatch the email.
+    /// </summary>
+    public class SendMail : IRequest<SendMailResponse>
+    {
+        /// <summary>
+        /// Gets or sets the email subject line.
+        /// </summary>
+        public string Subject { get; set; }
+
+        /// <summary>
+        /// Gets or sets the recipient's email address.
+        /// </summary>
+        public string Recipent { get; set; }
+
+        /// <summary>
+        /// Gets or sets the name or path of the template to render as the email body.
+        /// </summary>
+        public string Template { get; set; }
+
+        /// <summary>
+        /// Gets or sets a dictionary of file names to binary content for email attachments.
+        /// </summary>
+        public Dictionary<string, byte[]> Attachments { get; set; }
+
+        /// <summary>
+        /// Gets or sets a dictionary of placeholder keys and their values used when rendering the template.
+        /// </summary>
+        public Dictionary<string, string> TemplateVariables { get; set; }
+
+        /// <summary>
+        /// Gets or sets an optional dictionary of named templates passed to the mail message builder.
+        /// </summary>
+        public Dictionary<string, string> Templates { get; set; }
+    }
+}
diff --git a/src/TailoredApps.Shared.MediatR.Email/Responses/SendMailResponse.cs b/src/TailoredApps.Shared.MediatR.Email/Responses/SendMailResponse.cs
index eedb9ce..dfab226 100644
--- a/src/TailoredApps.Shared.MediatR.Email/Responses/SendMailResponse.cs
+++ b/src/TailoredApps.Shared.MediatR.Email/Responses/SendMailResponse.cs
@@ -1,14 +1,14 @@
-namespace TailoredApps.Shared.MediatR.Email.Responses
-{
-    /// <summary>
-    /// Represents the response returned after a <see cref="Messages.Commands.SendMail"/> command is handled.
-    /// Contains the provider-assigned identifier for the sent message.
-    /// </summary>
-    public class SendMailResponse
-    {
-        /// <summary>
-        /// Gets the unique identifier assigned to the sent message by the email provider.
-        /// </summary>
-        public string MessageId { get; internal set; }
-    }
-}
+namespace TailoredApps.Shared.MediatR.Email.Responses
+{
+    /// <summary>
+    /// Represents the response returned after a <see cref="Messages.Commands.SendMail"/> command is handled.
+    /// Contains the provider-assigned identifier for the sent message.
+    /// </summary>
+    public class SendMailResponse
+    {
+        /// <summary>
+        /// Gets the unique identifier assigned to the sent message by the email provider.
+        /// </summary>
+        public string MessageId { get; internal set; }
+    }
+}
diff --git a/src/TailoredApps.Shared.MediatR.ML/Domain/DataModel/Message/Commands/ClassifyImage.cs b/src/TailoredApps.Shared.MediatR.ML/Domain/DataModel/Message/Commands/ClassifyImage.cs
index cf92252..8e23c3e 100644
--- a/src/TailoredApps.Shared.MediatR.ML/Domain/DataModel/Message/Commands/ClassifyImage.cs
+++ b/src/TailoredApps.Shared.MediatR.ML/Domain/DataModel/Message/Commands/ClassifyImage.cs
@@ -1,11 +1,22 @@
-using MediatR;
+using MediatR;
 using TailoredApps.Shared.MediatR.ImageClassification.Domain.DataModel.Responses.Commands;
 
 namespace TailoredApps.Shared.MediatR.ImageClassification.Domain.DataModel.Message.Commands
 {
+    /// <summary>
+    /// MediatR command that requests classification of a single image.
+    /// Returns a <see cref="ClassifyImageResponse"/> containing the prediction result.
+    /// </summary>
     public class ClassifyImage : IRequest<ClassifyImageResponse>
     {
+        /// <summary>
+        /// Gets or sets the raw byte content of the image to classify.
+        /// </summary>
         public byte[] FileByteArray { get; set; }
+
+        /// <summary>
+        /// Gets or sets the original file name of the image, used for identification in the response.
+        /// </summary>
         public string FileName { get; set; }
     }
 }
diff --git a/src/TailoredApps.Shared.MediatR.ML/Domain/DataModel/Message/Commands/TrainImageClassificationModel.cs b/src/TailoredApps.Shared.MediatR.ML/Domain/DataModel/Message/Commands/TrainImageClassificationModel.cs
index 5d51e9f..321839f 100644
--- a/src/TailoredApps.Shared.MediatR.ML/Domain/DataModel/Message/Commands/TrainImageClassificationModel.cs
+++ b/src/TailoredApps.Shared.MediatR.ML/Domain/DataModel/Message/Commands/TrainImageClassificationModel.cs
@@ -1,11 +1,23 @@
-using MediatR;
+using MediatR;
 using TailoredApps.Shared.MediatR.ImageClassification.Domain.DataModel.Responses.Commands;
 
 namespace TailoredApps.Shared.MediatR.ImageClassification.Domain.DataModel.Message.Commands
 {
+    /// <summary>
+    /// MediatR command that requests training of a new image classification model
+    /// from a labelled image dataset. Returns a <see cref="TrainImageClassificationModelResponse"/>
+    /// containing the trained model path, version, and evaluation metadata.
+    /// </summary>
     public class TrainImageClassificationModel : IRequest<TrainImageClassificationModelResponse>
     {
+        /// <summary>
+        /// Gets or sets the path to the source directory containing labelled training images.
+        /// </summary>
         public string Source { get; set; }
+
+        /// <summary>
+        /// Gets or sets the destination file path where the trained model will be saved.
+        /// </summary>
         public string ModelDestFolderPath { get; set; }
     }
 }
diff --git a/src/TailoredApps.Shared.MediatR.ML/Domain/DataModel/Models/ImagePrediction.cs b/src/TailoredApps.Shared.MediatR.ML/Domain/DataModel/Models/ImagePrediction.cs
index a75336b..1b69b30 100644
--- a/src/TailoredApps.Shared.MediatR.ML/Domain/DataModel/Models/ImagePrediction.cs
+++ b/src/TailoredApps.Shared.MediatR.ML/Domain/DataModel/Models/ImagePrediction.cs
@@ -1,14 +1,37 @@
-
+
 using System.Collections.Generic;
 
 namespace TailoredApps.Shared.MediatR.ImageClassification.Domain.DataModel.Models
 {
+    /// <summary>
+    /// Represents the result of an image classification prediction,
+    /// including the predicted label, confidence score, and optional metadata.
+    /// </summary>
     public class ImagePrediction
     {
+        /// <summary>
+        /// Gets or sets the original file name of the classified image.
+        /// </summary>
         public string FileName { get; set; }
+
+        /// <summary>
+        /// Gets or sets the label of the class with the highest predicted confidence.
+        /// </summary>
         public string PredictedLabel { get; set; }
+
+        /// <summary>
+        /// Gets or sets the confidence score of the predicted label (0.0 to 1.0).
+        /// </summary>
         public float PredictedScore { get; set; }
+
+        /// <summary>
+        /// Gets or sets a dictionary mapping each class label to its confidence score.
+        /// </summary>
         public Dictionary<string, float> Scores { get; set; }
+
+        /// <summary>
+        /// Gets or sets metadata about the ML model used to produce this prediction.
+        /// </summary>
         public ModelInfo ModelInfo { get; set; }
     }
 }
diff --git a/src/TailoredApps.Shared.MediatR.ML/Domain/DataModel/Models/ModelInfo.cs b/src/TailoredApps.Shared.MediatR.ML/Domain/DataModel/Models/ModelInfo.cs
index c7c3865..075b766 100644
--- a/src/TailoredApps.Shared.MediatR.ML/Domain/DataModel/Models/ModelInfo.cs
+++ b/src/TailoredApps.Shared.MediatR.ML/Domain/DataModel/Models/ModelInfo.cs
@@ -1,7 +1,17 @@
-namespace TailoredApps.Shared.MediatR.ImageClassification.Domain.DataModel.Models
+namespace TailoredApps.Shared.MediatR.ImageClassification.Domain.DataModel.Models
 {
+    /// <summary>
+    /// Represents metadata about a trained ML model, including its name, checksum, version, and class labels.
+    /// </summary>
     public class ModelInfo
     {
+        /// <summary>
+        /// Initializes a new instance of <see cref="ModelInfo"/>.
+        /// </summary>
+        /// <param name="name">The file name of the model.</param>
+        /// <param name="checksum">The MD5 checksum of the model file.</param>
+        /// <param name="version">The version string embedded in the model file.</param>
+        /// <param name="labels">The array of class label names the model was trained with.</param>
         public ModelInfo(string name, string checksum, string version, string[] labels)
         {
             Labels = labels;
@@ -9,9 +19,25 @@ public ModelInfo(string name, string checksum, string version, string[] labels)
             Checksum = checksum;
             Name = name;
         }
+
+        /// <summary>
+        /// Gets or sets the array of class label names the model was trained to recognise.
+        /// </summary>
         public string[] Labels { get; set; }
+
+        /// <summary>
+        /// Gets or sets the file name of the model.
+        /// </summary>
         public string Name { get; set; }
+
+        /// <summary>
+        /// Gets or sets the version string assigned to the model at training time.
+        /// </summary>
         public string Version { get; set; }
+
+        /// <summary>
+        /// Gets or sets the MD5 checksum of the model file, used for integrity verification.
+        /// </summary>
         public string Checksum { get; set; }
     }
 }
diff --git a/src/TailoredApps.Shared.MediatR.ML/Domain/DataModel/Responses/Commands/ClassifyImageResponse.cs b/src/TailoredApps.Shared.MediatR.ML/Domain/DataModel/Responses/Commands/ClassifyImageResponse.cs
index 63161fc..0310cf9 100644
--- a/src/TailoredApps.Shared.MediatR.ML/Domain/DataModel/Responses/Commands/ClassifyImageResponse.cs
+++ b/src/TailoredApps.Shared.MediatR.ML/Domain/DataModel/Responses/Commands/ClassifyImageResponse.cs
@@ -1,9 +1,16 @@
-using TailoredApps.Shared.MediatR.ImageClassification.Domain.DataModel.Models;
+using TailoredApps.Shared.MediatR.ImageClassification.Domain.DataModel.Models;
 
 namespace TailoredApps.Shared.MediatR.ImageClassification.Domain.DataModel.Responses.Commands
 {
+    /// <summary>
+    /// Represents the response returned after handling a <c>ClassifyImage</c> command,
+    /// containing the classification prediction result.
+    /// </summary>
     public class ClassifyImageResponse
     {
+        /// <summary>
+        /// Gets or sets the image prediction result, including the predicted label and confidence score.
+        /// </summary>
         public ImagePrediction ImagePrediction { get; set; }
     }
 }
diff --git a/src/TailoredApps.Shared.MediatR.ML/Domain/DataModel/Responses/Commands/TrainImageClassificationModelResponse.cs b/src/TailoredApps.Shared.MediatR.ML/Domain/DataModel/Responses/Commands/TrainImageClassificationModelResponse.cs
index 733c1bc..e9e84e9 100644
--- a/src/TailoredApps.Shared.MediatR.ML/Domain/DataModel/Responses/Commands/TrainImageClassificationModelResponse.cs
+++ b/src/TailoredApps.Shared.MediatR.ML/Domain/DataModel/Responses/Commands/TrainImageClassificationModelResponse.cs
@@ -1,13 +1,31 @@
-using TailoredApps.Shared.MediatR.ImageClassification.Domain.DataModel.Models;
+using TailoredApps.Shared.MediatR.ImageClassification.Domain.DataModel.Models;
 
 namespace TailoredApps.Shared.MediatR.ImageClassification.Domain.DataModel.Responses.Commands
 {
+    /// <summary>
+    /// Represents the response returned after handling a <c>TrainImageClassificationModel</c> command,
+    /// containing details about the trained model.
+    /// </summary>
     public class TrainImageClassificationModelResponse
     {
+        /// <summary>
+        /// Gets or sets the file system path where the trained model was saved.
+        /// </summary>
         public string ModelPath { get; set; }
+
+        /// <summary>
+        /// Gets or sets the version string assigned to the trained model.
+        /// </summary>
         public string ModelVersion { get; internal set; }
+
+        /// <summary>
+        /// Gets or sets a formatted string containing model evaluation metrics.
+        /// </summary>
         public string ModelInfo { get; internal set; }
+
+        /// <summary>
+        /// Gets or sets the array of class label names discovered during training.
+        /// </summary>
         public string[] Labels { get; internal set; }
     }
 }
-
diff --git a/src/TailoredApps.Shared.MediatR.ML/Domain/Handlers/Commands/ClassifyImageCommandHandler.cs b/src/TailoredApps.Shared.MediatR.ML/Domain/Handlers/Commands/ClassifyImageCommandHandler.cs
index af87aad..741bc48 100644
--- a/src/TailoredApps.Shared.MediatR.ML/Domain/Handlers/Commands/ClassifyImageCommandHandler.cs
+++ b/src/TailoredApps.Shared.MediatR.ML/Domain/Handlers/Commands/ClassifyImageCommandHandler.cs
@@ -1,4 +1,4 @@
-using System.Threading;
+using System.Threading;
 using System.Threading.Tasks;
 using TailoredApps.Shared.MediatR.ImageClassification.Domain.DataModel.Message.Commands;
 using TailoredApps.Shared.MediatR.ImageClassification.Domain.DataModel.Responses.Commands;
@@ -7,13 +7,31 @@
 
 namespace TailoredApps.Shared.MediatR.ImageClassification.Domain.Handlers.Commands
 {
+    /// <summary>
+    /// Handles the <see cref="ClassifyImage"/> MediatR command by invoking the image classification service
+    /// and returning the prediction result.
+    /// </summary>
     public class ClassifyImageCommandHandler : IClassifyImageCommandHandler
     {
         private readonly IImageClassificationService classificationService;
+
+        /// <summary>
+        /// Initializes a new instance of <see cref="ClassifyImageCommandHandler"/>.
+        /// </summary>
+        /// <param name="classificationService">The image classification service used to run predictions.</param>
         public ClassifyImageCommandHandler(IImageClassificationService classificationService)
         {
             this.classificationService = classificationService;
         }
+
+        /// <summary>
+        /// Processes the <see cref="ClassifyImage"/> command and returns the classification result.
+        /// </summary>
+        /// <param name="request">The command containing the image bytes and file name to classify.</param>
+        /// <param name="cancellationToken">A token to monitor for cancellation requests.</param>
+        /// <returns>
+        /// A <see cref="ClassifyImageResponse"/> containing the prediction result for the provided image.
+        /// </returns>
         public async Task<ClassifyImageResponse> Handle(ClassifyImage request, CancellationToken cancellationToken)
         {
             return await Task.Run(() =>
diff --git a/src/TailoredApps.Shared.MediatR.ML/Domain/Handlers/Commands/TrainImageClassificationModelCommandHandler.cs b/src/TailoredApps.Shared.MediatR.ML/Domain/Handlers/Commands/TrainImageClassificationModelCommandHandler.cs
index 43c101d..62f9616 100644
--- a/src/TailoredApps.Shared.MediatR.ML/Domain/Handlers/Commands/TrainImageClassificationModelCommandHandler.cs
+++ b/src/TailoredApps.Shared.MediatR.ML/Domain/Handlers/Commands/TrainImageClassificationModelCommandHandler.cs
@@ -1,4 +1,4 @@
-using System.Collections.Generic;
+using System.Collections.Generic;
 using System.Linq;
 using System.Threading;
 using System.Threading.Tasks;
@@ -10,21 +10,44 @@
 
 namespace TailoredApps.Shared.MediatR.ImageClassification.Domain.Handlers.Commands
 {
+    /// <summary>
+    /// Handles the <see cref="TrainImageClassificationModel"/> MediatR command by loading training images,
+    /// training a classification model, and persisting the result with version and label metadata.
+    /// </summary>
     public class TrainImageClassificationModelCommandHandler : ITrainImageClassificationModelCommandHandler
     {
         private readonly IImageClassificationService classificationService;
         private readonly IModelHelper modelHelper;
+
+        /// <summary>
+        /// Initializes a new instance of <see cref="TrainImageClassificationModelCommandHandler"/>.
+        /// </summary>
+        /// <param name="classificationService">The service responsible for training the ML model.</param>
+        /// <param name="modelHelper">The helper used to embed version and label metadata into the model file.</param>
         public TrainImageClassificationModelCommandHandler(IImageClassificationService classificationService, IModelHelper modelHelper)
         {
             this.classificationService = classificationService;
             this.modelHelper = modelHelper;
         }
+
+        /// <summary>
+        /// Processes the <see cref="TrainImageClassificationModel"/> command: loads training images,
+        /// trains the model, adds versioning and labels, then returns the training result.
+        /// </summary>
+        /// <param name="request">
+        /// The command containing the source training folder path and the destination model file path.
+        /// </param>
+        /// <param name="cancellationToken">A token to monitor for cancellation requests.</param>
+        /// <returns>
+        /// A <see cref="TrainImageClassificationModelResponse"/> containing the saved model path,
+        /// version, evaluation info, and discovered class labels.
+        /// </returns>
         public async Task<TrainImageClassificationModelResponse> Handle(TrainImageClassificationModel request, CancellationToken cancellationToken)
         {
             var response = new TrainImageClassificationModelResponse();
 
             IEnumerable<ImageData> images = LoadImagesFromDirectory(request.Source);
-            var modelInfo = classificationService.Train(images, request.Source,request.ModelDestFolderPath);
+            var modelInfo = classificationService.Train(images, request.Source, request.ModelDestFolderPath);
             var version = modelHelper.AddVersion(request.ModelDestFolderPath);
             modelHelper.AddLabels(request.ModelDestFolderPath, modelInfo.labels);
             response.ModelPath = request.ModelDestFolderPath;
@@ -35,6 +58,14 @@ public async Task<TrainImageClassificationModelResponse> Handle(TrainImageClassi
 
         }
 
+        /// <summary>
+        /// Loads image file paths and labels from a training set directory.
+        /// </summary>
+        /// <param name="trainingSetFolder">The root directory containing labelled image sub-folders.</param>
+        /// <param name="useFolderNameAsLabel">
+        /// When <c>true</c> (default), the parent folder name is used as the image label.
+        /// </param>
+        /// <returns>An enumerable of <see cref="ImageData"/> instances with image paths and labels.</returns>
         private IEnumerable<ImageData> LoadImagesFromDirectory(string trainingSetFolder, bool useFolderNameAsLabel = true)
         {
             return FileUtils.LoadImagesFromDirectory(trainingSetFolder, useFolderNameAsLabel)
@@ -42,14 +73,30 @@ private IEnumerable<ImageData> LoadImagesFromDirectory(string trainingSetFolder,
         }
     }
 
+    /// <summary>
+    /// Represents a labelled image file used as a training sample for the ML model.
+    /// </summary>
     public class ImageData
     {
+        /// <summary>
+        /// Initializes a new instance of <see cref="ImageData"/>.
+        /// </summary>
+        /// <param name="imagePath">The full file path to the image.</param>
+        /// <param name="label">The classification label associated with this image.</param>
         public ImageData(string imagePath, string label)
         {
             ImagePath = imagePath;
             Label = label;
         }
+
+        /// <summary>
+        /// Gets the full file path to the image.
+        /// </summary>
         public string ImagePath { get; }
+
+        /// <summary>
+        /// Gets the classification label associated with this image.
+        /// </summary>
         public string Label { get; }
     }
 }
diff --git a/src/TailoredApps.Shared.MediatR.ML/Domain/Validation/ImageValidationExtension.cs b/src/TailoredApps.Shared.MediatR.ML/Domain/Validation/ImageValidationExtension.cs
index 488d8d3..aa6f791 100644
--- a/src/TailoredApps.Shared.MediatR.ML/Domain/Validation/ImageValidationExtension.cs
+++ b/src/TailoredApps.Shared.MediatR.ML/Domain/Validation/ImageValidationExtension.cs
@@ -1,17 +1,30 @@
-using System;
+using System;
 using System.Linq;
 using System.Text;
 
 namespace TailoredApps.Shared.MediatR.ImageClassification.Domain.Validation
 {
+    /// <summary>
+    /// Provides extension methods for validating image byte arrays.
+    /// </summary>
     public static class ImageValidationExtension
     {
+        /// <summary>
+        /// Determines whether the given byte array represents a valid image (JPEG or PNG).
+        /// </summary>
+        /// <param name="image">The byte array to validate.</param>
+        /// <returns><c>true</c> if the image is a valid JPEG or PNG; otherwise, <c>false</c>.</returns>
         public static bool IsValidImage(this byte[] image)
         {
             var imageFormat = GetImageFormat(image);
             return imageFormat == ImageFormat.jpeg || imageFormat == ImageFormat.png;
         }
 
+        /// <summary>
+        /// Detects the image format of the given byte array by inspecting its file header signature.
+        /// </summary>
+        /// <param name="bytes">The byte array to inspect.</param>
+        /// <returns>The detected <see cref="ImageFormat"/>, or <see cref="ImageFormat.unknown"/> if unrecognised.</returns>
         private static ImageFormat GetImageFormat(byte[] bytes)
         {
             // see http://www.mikekunz.com/image_file_header.html
@@ -48,13 +61,22 @@ private static ImageFormat GetImageFormat(byte[] bytes)
             return ImageFormat.unknown;
         }
 
+        /// <summary>
+        /// Represents the supported image file formats identified by header byte signatures.
+        /// </summary>
         public enum ImageFormat
         {
+            /// <summary>Format could not be determined.</summary>
             unknown,
+            /// <summary>Windows Bitmap (BMP) format.</summary>
             bmp,
+            /// <summary>JPEG / JFIF format.</summary>
             jpeg,
+            /// <summary>Graphics Interchange Format (GIF).</summary>
             gif,
+            /// <summary>Tagged Image File Format (TIFF).</summary>
             tiff,
+            /// <summary>Portable Network Graphics (PNG) format.</summary>
             png
         }
     }
diff --git a/src/TailoredApps.Shared.MediatR.ML/Infrastructure/AddPredictionEngineExtension.cs b/src/TailoredApps.Shared.MediatR.ML/Infrastructure/AddPredictionEngineExtension.cs
index b86f3f2..b22f493 100644
--- a/src/TailoredApps.Shared.MediatR.ML/Infrastructure/AddPredictionEngineExtension.cs
+++ b/src/TailoredApps.Shared.MediatR.ML/Infrastructure/AddPredictionEngineExtension.cs
@@ -1,15 +1,26 @@
-using Microsoft.Extensions.DependencyInjection;
-using Microsoft.Extensions.ML;
 using System;
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.ML;
 using TailoredApps.Shared.MediatR.ImageClassification.Interfaces.Infrastructure;
 using TailoredApps.Shared.MediatR.ML.Infrastructure;
 using static TailoredApps.Shared.MediatR.ImageClassification.Infrastructure.ImageClassificationOptions;
 
 namespace TailoredApps.Shared.MediatR.ImageClassification.Infrastructure
 {
+    /// <summary>
+    /// Provides extension methods for configuring the prediction engine and image classification services
+    /// in the dependency injection container.
+    /// </summary>
     public static class AddPredictionEngineExtension
     {
-
+        /// <summary>
+        /// Registers the <see cref="IPredictionEnginePoolAdapter{TData, TPrediction}"/> adapter
+        /// for the given prediction engine pool builder.
+        /// </summary>
+        /// <typeparam name="TData">The input data type for the prediction engine.</typeparam>
+        /// <typeparam name="TPrediction">The output prediction type produced by the engine.</typeparam>
+        /// <param name="builder">The prediction engine pool builder to extend.</param>
+        /// <returns>The original <paramref name="builder"/> instance for chaining.</returns>
         public static PredictionEnginePoolBuilder<TData, TPrediction> AddAdapter<TData, TPrediction>(this PredictionEnginePoolBuilder<TData, TPrediction> builder)
             where TData : class
             where TPrediction : class, new()
@@ -20,12 +31,23 @@ public static PredictionEnginePoolBuilder<TData, TPrediction> AddAdapter<TData,
             builder.Services.AddSingleton<IPredictionEnginePoolAdapter<TData, TPrediction>, PredictionEnginePoolAdapter<TData, TPrediction>>();
             return builder;
         }
+
+        /// <summary>
+        /// Registers all image classification services, model helper, and prediction engine configuration
+        /// into the dependency injection container.
+        /// </summary>
+        /// <param name="services">The <see cref="IServiceCollection"/> to add services to.</param>
+        /// <param name="configuration">
+        /// An action to configure the <see cref="PredictionEngineServiceConfiguration"/>,
+        /// including model registration.
+        /// </param>
+        /// <returns>The <paramref name="services"/> instance for chaining.</returns>
         public static IServiceCollection AddPredictionEngine(this IServiceCollection services, Action<PredictionEngineServiceConfiguration> configuration)
         {
 
             services.ConfigureOptions<ImageClassificationConfigureOptions>();
             var serviceConfig = new PredictionEngineServiceConfiguration(services);
-            
+
             configuration.Invoke(serviceConfig);
             services.AddScoped<IImageClassificationService, ImageClassificationService>();
             services.AddScoped<IModelInfoService, ModelInfoService>();
diff --git a/src/TailoredApps.Shared.MediatR.ML/Infrastructure/ClassificationService.cs b/src/TailoredApps.Shared.MediatR.ML/Infrastructure/ClassificationService.cs
index 6e57f2a..26d9f17 100644
--- a/src/TailoredApps.Shared.MediatR.ML/Infrastructure/ClassificationService.cs
+++ b/src/TailoredApps.Shared.MediatR.ML/Infrastructure/ClassificationService.cs
@@ -1,10 +1,10 @@
-using Microsoft.ML;
-using Microsoft.ML.Data;
 using System;
 using System.Collections.Generic;
 using System.Diagnostics;
 using System.Linq;
 using System.Text;
+using Microsoft.ML;
+using Microsoft.ML.Data;
 using TailoredApps.Shared.MediatR.ImageClassification.Domain.DataModel.Models;
 using TailoredApps.Shared.MediatR.ImageClassification.Domain.Handlers.Commands;
 using TailoredApps.Shared.MediatR.ImageClassification.Interfaces.Domain.Models;
@@ -12,17 +12,30 @@
 
 namespace TailoredApps.Shared.MediatR.ImageClassification.Infrastructure
 {
+    /// <summary>
+    /// Provides image classification and model training functionality using ML.NET.
+    /// </summary>
     public class ImageClassificationService : IImageClassificationService
 
     {
         private readonly IPredictionEnginePoolAdapter<InMemoryImageData, ImagePredictionScore> predictionEnginePool;
         private readonly IModelInfoService modelInfoService;
+
+        /// <summary>
+        /// Initializes a new instance of <see cref="ImageClassificationService"/>.
+        /// </summary>
+        /// <param name="predictionEnginePool">The prediction engine pool adapter used to run predictions.</param>
+        /// <param name="modelInfoService">The service that provides metadata about the loaded model.</param>
         public ImageClassificationService(IPredictionEnginePoolAdapter<InMemoryImageData, ImagePredictionScore> predictionEnginePool, IModelInfoService modelInfoService)
         {
             this.predictionEnginePool = predictionEnginePool;
             this.modelInfoService = modelInfoService;
         }
 
+        /// <summary>
+        /// Retrieves metadata about the currently loaded ML model.
+        /// </summary>
+        /// <returns>A <see cref="ModelInfo"/> object containing the model's name, checksum, version, and labels.</returns>
         public ModelInfo GetModelInfo()
         {
             return new ModelInfo(
@@ -33,11 +46,17 @@ public ModelInfo GetModelInfo()
             );
         }
 
+        /// <summary>
+        /// Runs an image classification prediction on the provided image bytes.
+        /// </summary>
+        /// <param name="image">The raw byte content of the image to classify.</param>
+        /// <param name="fileName">The original file name of the image, used for identification in the result.</param>
+        /// <returns>An <see cref="ImagePrediction"/> containing the predicted label and score.</returns>
         public ImagePrediction Predict(byte[] image, string fileName)
         {
             var imageData = new InMemoryImageData(image, null, fileName);
             ImagePredictionScore prediction = predictionEnginePool.Predict(imageData);
-           // ModelInfo modelInfo = GetModelInfo();
+            // ModelInfo modelInfo = GetModelInfo();
 
             ImagePrediction imagePrediction = new ImagePrediction()
             {
@@ -55,6 +74,15 @@ public ImagePrediction Predict(byte[] image, string fileName)
 
         }
 
+        /// <summary>
+        /// Trains an image classification model using the provided image dataset and saves it to disk.
+        /// </summary>
+        /// <param name="images">The collection of labelled image data used for training.</param>
+        /// <param name="trainingSetFolder">The folder path containing the raw training image files.</param>
+        /// <param name="modelDestFolderPath">The destination file path where the trained model will be saved.</param>
+        /// <returns>
+        /// A tuple containing an evaluation info string and an array of class label names discovered during training.
+        /// </returns>
         public (string info, string[] labels) Train(IEnumerable<ImageData> images, string trainingSetFolder, string modelDestFolderPath)
         {
             var mlContext = new MLContext(seed: 1);
@@ -85,9 +113,17 @@ public ImagePrediction Predict(byte[] image, string fileName)
             var elapsed = watch.ElapsedMilliseconds / 1000;
             var res = EvaluateModel(mlContext, testDataView, trainedModel);
             mlContext.Model.Save(trainedModel, trainDataView.Schema, modelDestFolderPath);
-            return (res.info,res.labels);
+            return (res.info, res.labels);
         }
-        private (string[] labels, string info)  EvaluateModel(MLContext mlContext, IDataView testDataView, ITransformer trainDataView)
+
+        /// <summary>
+        /// Evaluates the trained model against the test data view and returns evaluation metrics and labels.
+        /// </summary>
+        /// <param name="mlContext">The ML.NET context used for evaluation.</param>
+        /// <param name="testDataView">The data view containing the test dataset.</param>
+        /// <param name="trainDataView">The trained transformer to evaluate.</param>
+        /// <returns>A tuple of discovered class labels and a formatted metrics info string.</returns>
+        private (string[] labels, string info) EvaluateModel(MLContext mlContext, IDataView testDataView, ITransformer trainDataView)
         {
             var watch = Stopwatch.StartNew();
             var predictionDataView = trainDataView.Transform(testDataView);
@@ -99,9 +135,15 @@ public ImagePrediction Predict(byte[] image, string fileName)
             return (labels, PrintMultiClassClassificationMetrics("TF DNN:", metrics));
         }
 
-        private string  PrintMultiClassClassificationMetrics(string name, MulticlassClassificationMetrics metrics)
+        /// <summary>
+        /// Formats multiclass classification metrics into a human-readable string.
+        /// </summary>
+        /// <param name="name">A label or name prefix for the metrics output.</param>
+        /// <param name="metrics">The <see cref="MulticlassClassificationMetrics"/> to format.</param>
+        /// <returns>A string containing macro/micro accuracy, log loss, and per-class log loss values.</returns>
+        private string PrintMultiClassClassificationMetrics(string name, MulticlassClassificationMetrics metrics)
         {
-            
+
             var builder = new StringBuilder();
 
             builder.AppendLine($"accuracy macro {metrics.MacroAccuracy:0.####}, the closer to 1 better");
@@ -117,6 +159,11 @@ private string  PrintMultiClassClassificationMetrics(string name, MulticlassClas
             return builder.ToString();
         }
 
+        /// <summary>
+        /// Extracts class label names from the Score column's slot name annotations in the data view schema.
+        /// </summary>
+        /// <param name="schema">The <see cref="DataViewSchema"/> to read label annotations from.</param>
+        /// <returns>An array of label name strings.</returns>
         public string[] GetLabels(DataViewSchema schema)
         {
             var labelBuffer = new VBuffer<ReadOnlyMemory<char>>();
diff --git a/src/TailoredApps.Shared.MediatR.ML/Infrastructure/FileUtils.cs b/src/TailoredApps.Shared.MediatR.ML/Infrastructure/FileUtils.cs
index 683684a..3dc3259 100644
--- a/src/TailoredApps.Shared.MediatR.ML/Infrastructure/FileUtils.cs
+++ b/src/TailoredApps.Shared.MediatR.ML/Infrastructure/FileUtils.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.IO;
 using System.Linq;
@@ -8,8 +8,22 @@
 
 namespace TailoredApps.Shared.MediatR.ML.Infrastructure
 {
+    /// <summary>
+    /// Provides utility methods for file and directory operations used in ML pipelines.
+    /// </summary>
     internal class FileUtils
     {
+        /// <summary>
+        /// Loads image file paths and their associated labels from a directory.
+        /// </summary>
+        /// <param name="folder">The root folder to scan for image files.</param>
+        /// <param name="useFolderNameAsLabel">
+        /// When <c>true</c>, the parent folder name is used as the label.
+        /// When <c>false</c>, the leading alphabetic characters of the file name are used.
+        /// </param>
+        /// <returns>
+        /// An enumerable of tuples containing the full image path and its derived label.
+        /// </returns>
         public static IEnumerable<(string ImagePath, string Label)> LoadImagesFromDirectory(string folder, bool useFolderNameAsLabel)
         {
 
@@ -34,6 +48,12 @@ internal class FileUtils
         }
 
 
+        /// <summary>
+        /// Resolves a relative path to an absolute path based on the location of the given assembly.
+        /// </summary>
+        /// <param name="assembly">The assembly whose directory is used as the base path.</param>
+        /// <param name="relative">The relative path to resolve.</param>
+        /// <returns>The absolute path combining the assembly directory and the relative path.</returns>
         public static string GetAbsolutePath(Assembly assembly, string relative)
         {
             var assemblyFolderPath = new FileInfo(assembly.Location).Directory.FullName;
diff --git a/src/TailoredApps.Shared.MediatR.ML/Infrastructure/ImageClassificationOptions.cs b/src/TailoredApps.Shared.MediatR.ML/Infrastructure/ImageClassificationOptions.cs
index 9c028d1..e9c3c61 100644
--- a/src/TailoredApps.Shared.MediatR.ML/Infrastructure/ImageClassificationOptions.cs
+++ b/src/TailoredApps.Shared.MediatR.ML/Infrastructure/ImageClassificationOptions.cs
@@ -1,21 +1,49 @@
-using Microsoft.Extensions.Configuration;
+using Microsoft.Extensions.Configuration;
 using Microsoft.Extensions.Options;
 
 namespace TailoredApps.Shared.MediatR.ImageClassification.Infrastructure
 {
+    /// <summary>
+    /// Configuration options for the image classification feature, bound from the application configuration.
+    /// </summary>
     public class ImageClassificationOptions
     {
+        /// <summary>
+        /// The configuration section key used to bind <see cref="ImageClassificationOptions"/>.
+        /// </summary>
         public const string ConfigurationKey = "ImageClassification";
+
+        /// <summary>
+        /// The configuration key path for the model file path setting.
+        /// </summary>
         public const string ModelFilePathConfig = "ImageClassification:ModelFilePath";
+
+        /// <summary>
+        /// Gets or sets the file system path to the ML model file.
+        /// </summary>
         public string ModelFilePath { get; set; }
+
+        /// <summary>
+        /// Implements <see cref="IConfigureOptions{TOptions}"/> to populate <see cref="ImageClassificationOptions"/>
+        /// from the application configuration.
+        /// </summary>
         public class ImageClassificationConfigureOptions : IConfigureOptions<ImageClassificationOptions>
         {
             private readonly IConfiguration configuration;
+
+            /// <summary>
+            /// Initializes a new instance of <see cref="ImageClassificationConfigureOptions"/>.
+            /// </summary>
+            /// <param name="configuration">The application configuration to read settings from.</param>
             public ImageClassificationConfigureOptions(IConfiguration configuration)
             {
                 this.configuration = configuration;
             }
 
+            /// <summary>
+            /// Configures the <see cref="ImageClassificationOptions"/> by binding values from the configuration section.
+            /// </summary>
+            /// <param name="options">The options instance to populate.</param>
             public void Configure(ImageClassificationOptions options)
             {
                 var section = configuration.GetSection(ImageClassificationOptions.ConfigurationKey).Get<ImageClassificationOptions>();
diff --git a/src/TailoredApps.Shared.MediatR.ML/Infrastructure/ModelHelper.cs b/src/TailoredApps.Shared.MediatR.ML/Infrastructure/ModelHelper.cs
index 52c5487..4c2a7ec 100644
--- a/src/TailoredApps.Shared.MediatR.ML/Infrastructure/ModelHelper.cs
+++ b/src/TailoredApps.Shared.MediatR.ML/Infrastructure/ModelHelper.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.IO;
 using System.IO.Compression;
 using System.Linq;
@@ -7,12 +7,25 @@
 
 namespace TailoredApps.Shared.MediatR.ImageClassification.Infrastructure
 {
+    /// <summary>
+    /// Provides helper operations for ML model files, including versioning, label management, and checksum computation.
+    /// </summary>
     public class ModelHelper : IModelHelper
     {
+        /// <summary>The date/time format used when generating model version strings.</summary>
         const string versionFormat = "yyyyMMdd.HHmmss";
+
+        /// <summary>The name of the version entry stored inside the model zip archive.</summary>
         const string versionFileName = "Version.txt";
+
+        /// <summary>The name of the labels entry stored inside the model zip archive.</summary>
         const string labelsFileName = "Labels.txt";
 
+        /// <summary>
+        /// Adds a timestamp-based version entry to the model zip archive.
+        /// </summary>
+        /// <param name="modelFilePath">The file path of the model zip archive to update.</param>
+        /// <returns>The generated version string in <c>yyyyMMdd.HHmmss</c> format.</returns>
         public string AddVersion(string modelFilePath)
         {
             string version = DateTime.Now.ToString(versionFormat);
@@ -40,7 +53,13 @@ public string AddVersion(string modelFilePath)
             }
             return version;
         }
-        public  void AddLabels(string modelFilePath, string[] labels)
+
+        /// <summary>
+        /// Adds a pipe-separated list of class labels to the model zip archive.
+        /// </summary>
+        /// <param name="modelFilePath">The file path of the model zip archive to update.</param>
+        /// <param name="labels">An array of label strings to embed in the archive.</param>
+        public void AddLabels(string modelFilePath, string[] labels)
         {
             using (FileStream fs = new FileStream(modelFilePath, FileMode.Open))
             {
@@ -53,7 +72,7 @@ public  void AddLabels(string modelFilePath, string[] labels)
                         using (StreamWriter sw = new StreamWriter(readmeStream))
                         {
                             readmeStream = null;
-                            sw.WriteLine(string.Join("|",labels));
+                            sw.WriteLine(string.Join("|", labels));
                         }
                     }
                     finally
@@ -66,6 +85,11 @@ public  void AddLabels(string modelFilePath, string[] labels)
             }
         }
 
+        /// <summary>
+        /// Computes the MD5 checksum of the model file.
+        /// </summary>
+        /// <param name="modelFilePath">The file path of the model to compute the checksum for.</param>
+        /// <returns>A lowercase hexadecimal string representing the MD5 hash of the file.</returns>
         public string GetChecksum(string modelFilePath)
         {
             using var md5 = MD5.Create();
@@ -74,6 +98,13 @@ public string GetChecksum(string modelFilePath)
             return BitConverter.ToString(checksum).Replace("-", string.Empty).ToLower();
         }
 
+        /// <summary>
+        /// Reads the version string from the model zip archive.
+        /// </summary>
+        /// <param name="modelFilePath">The file path of the model zip archive.</param>
+        /// <returns>
+        /// The version string stored in the archive, or <c>"UNKNOWN"</c> if not found or an error occurs.
+        /// </returns>
         public string GetVersion(string modelFilePath)
         {
             try
@@ -93,6 +124,14 @@ public string GetVersion(string modelFilePath)
             }
             return "UNKNOWN";
         }
+
+        /// <summary>
+        /// Reads the class labels from the model zip archive.
+        /// </summary>
+        /// <param name="modelFilePath">The file path of the model zip archive.</param>
+        /// <returns>
+        /// An array of label strings parsed from the archive, or an empty array if not found or an error occurs.
+        /// </returns>
         public string[] GetLabels(string modelFilePath)
         {
             try
@@ -103,7 +142,7 @@ public string[] GetLabels(string modelFilePath)
                 if (zipArchiveEntry != null)
                 {
                     using StreamReader streamReader = new StreamReader(zipArchiveEntry.Open());
-                    return streamReader.ReadLine().Split('|').Select(z=>z.Trim()).Where(z=>z.Length>0).ToArray();
+                    return streamReader.ReadLine().Split('|').Select(z => z.Trim()).Where(z => z.Length > 0).ToArray();
                 }
             }
             catch (Exception)
diff --git a/src/TailoredApps.Shared.MediatR.ML/Infrastructure/ModelInfoService.cs b/src/TailoredApps.Shared.MediatR.ML/Infrastructure/ModelInfoService.cs
index ebd2138..a8351f4 100644
--- a/src/TailoredApps.Shared.MediatR.ML/Infrastructure/ModelInfoService.cs
+++ b/src/TailoredApps.Shared.MediatR.ML/Infrastructure/ModelInfoService.cs
@@ -1,26 +1,51 @@
-using Microsoft.Extensions.Options;
 using System.IO;
+using Microsoft.Extensions.Options;
 using TailoredApps.Shared.MediatR.ImageClassification.Interfaces.Domain.Models;
 using TailoredApps.Shared.MediatR.ImageClassification.Interfaces.Infrastructure;
 
 namespace TailoredApps.Shared.MediatR.ImageClassification.Infrastructure
 {
-    public class ModelInfoService : IModelInfoService 
+    /// <summary>
+    /// Provides metadata about the currently configured ML model by reading from the model file and configuration.
+    /// </summary>
+    public class ModelInfoService : IModelInfoService
     {
         private readonly IModelHelper modelHelper;
         private readonly IOptions<ImageClassificationOptions> options;
+
+        /// <summary>
+        /// Initializes a new instance of <see cref="ModelInfoService"/>.
+        /// </summary>
+        /// <param name="options">The configuration options containing the model file path.</param>
+        /// <param name="modelHelper">The helper used to extract metadata from the model file.</param>
         public ModelInfoService(IOptions<ImageClassificationOptions> options, IModelHelper modelHelper)
         {
             this.modelHelper = modelHelper;
         }
+
+        /// <summary>
+        /// Gets the MD5 checksum of the model file.
+        /// </summary>
         public string ModelChecksum => modelHelper.GetChecksum(options.Value.ModelFilePath);
 
+        /// <summary>
+        /// Gets the version string embedded in the model file.
+        /// </summary>
         public string ModelVersion => modelHelper.GetVersion(options.Value.ModelFilePath);
 
+        /// <summary>
+        /// Gets the full file system path to the model file.
+        /// </summary>
         public string ModelFilePath => options.Value.ModelFilePath;
 
+        /// <summary>
+        /// Gets the file name (without directory) of the model file.
+        /// </summary>
         public string ModelFileName => Path.GetFileName(options.Value.ModelFilePath);
 
+        /// <summary>
+        /// Gets the array of class label names stored in the model file.
+        /// </summary>
         public string[] Labels => modelHelper.GetLabels(options.Value.ModelFilePath);
     }
 }
diff --git a/src/TailoredApps.Shared.MediatR.ML/Infrastructure/PredictionEnginePoolAdapter.cs b/src/TailoredApps.Shared.MediatR.ML/Infrastructure/PredictionEnginePoolAdapter.cs
index 3ffafa7..ed8bc0b 100644
--- a/src/TailoredApps.Shared.MediatR.ML/Infrastructure/PredictionEnginePoolAdapter.cs
+++ b/src/TailoredApps.Shared.MediatR.ML/Infrastructure/PredictionEnginePoolAdapter.cs
@@ -1,23 +1,38 @@
-using Microsoft.Extensions.ML;
-using Microsoft.ML.Data;
 using System;
 using System.Linq;
+using Microsoft.Extensions.ML;
+using Microsoft.ML.Data;
 using TailoredApps.Shared.MediatR.ImageClassification.Interfaces.Infrastructure;
 
 namespace TailoredApps.Shared.MediatR.ImageClassification.Infrastructure
 {
+    /// <summary>
+    /// Adapts a <see cref="PredictionEnginePool{TData, TPrediction}"/> to the
+    /// <see cref="IPredictionEnginePoolAdapter{TData, TPrediction}"/> interface,
+    /// providing prediction and label extraction capabilities.
+    /// </summary>
+    /// <typeparam name="TData">The input data type for the prediction engine.</typeparam>
+    /// <typeparam name="TPrediction">The output prediction type produced by the engine.</typeparam>
     public class PredictionEnginePoolAdapter<TData, TPrediction> : IPredictionEnginePoolAdapter<TData, TPrediction>
         where TData : class
         where TPrediction : class, new()
     {
         private readonly PredictionEnginePool<TData, TPrediction> predictionEnginePool;
 
+        /// <summary>
+        /// Initializes a new instance of <see cref="PredictionEnginePoolAdapter{TData, TPrediction}"/>.
+        /// </summary>
+        /// <param name="predictionEngine">The underlying prediction engine pool to wrap.</param>
         public PredictionEnginePoolAdapter(PredictionEnginePool<TData, TPrediction> predictionEngine)
         {
             predictionEnginePool = predictionEngine;
-            
+
         }
 
+        /// <summary>
+        /// Retrieves the class label names from the prediction engine's output schema Score slot annotations.
+        /// </summary>
+        /// <returns>An array of label name strings corresponding to the Score column slots.</returns>
         public string[] GetLabels()
         {
             var labelBuffer = new VBuffer<ReadOnlyMemory<char>>();
@@ -26,6 +41,11 @@ public string[] GetLabels()
             return labelBuffer.DenseValues().Select(l => l.ToString()).ToArray();
         }
 
+        /// <summary>
+        /// Runs a prediction on the provided input example using the pooled prediction engine.
+        /// </summary>
+        /// <param name="example">The input data instance to classify.</param>
+        /// <returns>The prediction result of type <typeparamref name="TPrediction"/>.</returns>
         public TPrediction Predict(TData example)
         {
             return predictionEnginePool.Predict<TData, TPrediction>(example);
diff --git a/src/TailoredApps.Shared.MediatR.ML/Infrastructure/PredictionEngineServiceConfiguration.cs b/src/TailoredApps.Shared.MediatR.ML/Infrastructure/PredictionEngineServiceConfiguration.cs
index f3165b5..f6f171d 100644
--- a/src/TailoredApps.Shared.MediatR.ML/Infrastructure/PredictionEngineServiceConfiguration.cs
+++ b/src/TailoredApps.Shared.MediatR.ML/Infrastructure/PredictionEngineServiceConfiguration.cs
@@ -1,24 +1,39 @@
-using Microsoft.Extensions.DependencyInjection;
-using Microsoft.Extensions.ML;
 using System;
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.ML;
 using TailoredApps.Shared.MediatR.ImageClassification.Infrastructure;
 
 namespace TailoredApps.Shared.MediatR.ML.Infrastructure
 {
+    /// <summary>
+    /// Provides configuration support for registering machine learning prediction engine models
+    /// with the dependency injection container.
+    /// </summary>
     public class PredictionEngineServiceConfiguration
     {
         private IServiceCollection services;
 
+        /// <summary>
+        /// Initializes a new instance of <see cref="PredictionEngineServiceConfiguration"/>
+        /// with the given service collection.
+        /// </summary>
+        /// <param name="services">The <see cref="IServiceCollection"/> to register services into.</param>
         public PredictionEngineServiceConfiguration(IServiceCollection services)
         {
             this.services = services;
         }
 
+        /// <summary>
+        /// Registers a machine learning model with the prediction engine pool using the provided builder configuration.
+        /// </summary>
+        /// <typeparam name="D">The input data type used for prediction.</typeparam>
+        /// <typeparam name="R">The output result type returned by the prediction engine.</typeparam>
+        /// <param name="builder">An action that configures the <see cref="PredictionEnginePoolBuilder{D, R}"/>.</param>
         public void RegisterMachineLearningModel<D, R>(Action<PredictionEnginePoolBuilder<D, R>> builder) where D : class where R : class, new()
         {
-            
+
             var b = services.AddPredictionEnginePool<D, R>().AddAdapter();
-            
+
             builder.Invoke(b);
         }
     }
diff --git a/src/TailoredApps.Shared.MediatR.ML/Interfaces/Domain/Handlers/Commands/IClassifyImageCommandHandler.cs b/src/TailoredApps.Shared.MediatR.ML/Interfaces/Domain/Handlers/Commands/IClassifyImageCommandHandler.cs
index 278db3d..5cd4ef3 100644
--- a/src/TailoredApps.Shared.MediatR.ML/Interfaces/Domain/Handlers/Commands/IClassifyImageCommandHandler.cs
+++ b/src/TailoredApps.Shared.MediatR.ML/Interfaces/Domain/Handlers/Commands/IClassifyImageCommandHandler.cs
@@ -1,9 +1,13 @@
-using MediatR;
+using MediatR;
 using TailoredApps.Shared.MediatR.ImageClassification.Domain.DataModel.Message.Commands;
 using TailoredApps.Shared.MediatR.ImageClassification.Domain.DataModel.Responses.Commands;
 
 namespace TailoredApps.Shared.MediatR.ImageClassification.Interfaces.Domain.Handlers.Commands
 {
+    /// <summary>
+    /// MediatR handler contract for the <see cref="ClassifyImage"/> command.
+    /// Implementations run the ML classification pipeline and return a <see cref="ClassifyImageResponse"/>.
+    /// </summary>
     public interface IClassifyImageCommandHandler : IRequestHandler<ClassifyImage, ClassifyImageResponse>
     {
     }
diff --git a/src/TailoredApps.Shared.MediatR.ML/Interfaces/Domain/Handlers/Commands/ITrainImageClassificationModelCommandHandler.cs b/src/TailoredApps.Shared.MediatR.ML/Interfaces/Domain/Handlers/Commands/ITrainImageClassificationModelCommandHandler.cs
index 1775b3d..e95497f 100644
--- a/src/TailoredApps.Shared.MediatR.ML/Interfaces/Domain/Handlers/Commands/ITrainImageClassificationModelCommandHandler.cs
+++ b/src/TailoredApps.Shared.MediatR.ML/Interfaces/Domain/Handlers/Commands/ITrainImageClassificationModelCommandHandler.cs
@@ -1,9 +1,13 @@
-using MediatR;
+using MediatR;
 using TailoredApps.Shared.MediatR.ImageClassification.Domain.DataModel.Message.Commands;
 using TailoredApps.Shared.MediatR.ImageClassification.Domain.DataModel.Responses.Commands;
 
 namespace TailoredApps.Shared.MediatR.ImageClassification.Interfaces.Domain.Handlers.Commands
 {
+    /// <summary>
+    /// MediatR handler contract for the <see cref="TrainImageClassificationModel"/> command.
+    /// Implementations train a new ML.NET image classification model and return a <see cref="TrainImageClassificationModelResponse"/>.
+    /// </summary>
     public interface ITrainImageClassificationModelCommandHandler : IRequestHandler<TrainImageClassificationModel, TrainImageClassificationModelResponse>
     {
     }
diff --git a/src/TailoredApps.Shared.MediatR.ML/Interfaces/Domain/Models/ImagePredictionScore.cs b/src/TailoredApps.Shared.MediatR.ML/Interfaces/Domain/Models/ImagePredictionScore.cs
index ce75ff7..cdc7750 100644
--- a/src/TailoredApps.Shared.MediatR.ML/Interfaces/Domain/Models/ImagePredictionScore.cs
+++ b/src/TailoredApps.Shared.MediatR.ML/Interfaces/Domain/Models/ImagePredictionScore.cs
@@ -1,11 +1,22 @@
-using Microsoft.ML.Data;
+using Microsoft.ML.Data;
 
 namespace TailoredApps.Shared.MediatR.ImageClassification.Interfaces.Domain.Models
 {
+    /// <summary>
+    /// Represents the raw output of the ML.NET image classification prediction engine,
+    /// containing per-class confidence scores and the predicted label.
+    /// </summary>
     public class ImagePredictionScore
     {
+        /// <summary>
+        /// Gets or sets the array of confidence scores for each class, mapped from the <c>Score</c> column.
+        /// </summary>
         [ColumnName("Score")]
         public float[] Score { get; set; }
+
+        /// <summary>
+        /// Gets or sets the label of the class with the highest predicted confidence score.
+        /// </summary>
         public string PredictedLabel { get; set; }
     }
 }
diff --git a/src/TailoredApps.Shared.MediatR.ML/Interfaces/Domain/Models/InMemoryImageData.cs b/src/TailoredApps.Shared.MediatR.ML/Interfaces/Domain/Models/InMemoryImageData.cs
index 8e01e06..d4a6d83 100644
--- a/src/TailoredApps.Shared.MediatR.ML/Interfaces/Domain/Models/InMemoryImageData.cs
+++ b/src/TailoredApps.Shared.MediatR.ML/Interfaces/Domain/Models/InMemoryImageData.cs
@@ -1,7 +1,17 @@
-namespace TailoredApps.Shared.MediatR.ImageClassification.Interfaces.Domain.Models
+namespace TailoredApps.Shared.MediatR.ImageClassification.Interfaces.Domain.Models
 {
+    /// <summary>
+    /// Represents an in-memory image along with its optional label and file name,
+    /// used as input to the ML.NET prediction engine.
+    /// </summary>
     public class InMemoryImageData
     {
+        /// <summary>
+        /// Initializes a new instance of <see cref="InMemoryImageData"/>.
+        /// </summary>
+        /// <param name="image">The raw byte content of the image.</param>
+        /// <param name="label">The classification label associated with the image, or <c>null</c> if unknown.</param>
+        /// <param name="fileName">The original file name of the image.</param>
         public InMemoryImageData(byte[] image, string label, string fileName)
         {
             Image = image;
@@ -10,8 +20,19 @@ public InMemoryImageData(byte[] image, string label, string fileName)
 
         }
 
+        /// <summary>
+        /// Gets the raw byte content of the image.
+        /// </summary>
         public byte[] Image { get; }
+
+        /// <summary>
+        /// Gets the classification label associated with the image.
+        /// </summary>
         public string Label { get; }
+
+        /// <summary>
+        /// Gets the original file name of the image.
+        /// </summary>
         public string FileName { get; }
     }
 }
diff --git a/src/TailoredApps.Shared.MediatR.ML/Interfaces/Infrastructure/IClassificationService.cs b/src/TailoredApps.Shared.MediatR.ML/Interfaces/Infrastructure/IClassificationService.cs
index d6cb042..36ae480 100644
--- a/src/TailoredApps.Shared.MediatR.ML/Interfaces/Infrastructure/IClassificationService.cs
+++ b/src/TailoredApps.Shared.MediatR.ML/Interfaces/Infrastructure/IClassificationService.cs
@@ -1,13 +1,34 @@
-using System.Collections.Generic;
+using System.Collections.Generic;
 using TailoredApps.Shared.MediatR.ImageClassification.Domain.DataModel.Models;
 using TailoredApps.Shared.MediatR.ImageClassification.Domain.Handlers.Commands;
 
 namespace TailoredApps.Shared.MediatR.ImageClassification.Interfaces.Infrastructure
 {
+    /// <summary>
+    /// Abstraction for the image classification service that wraps the ML.NET prediction engine.
+    /// </summary>
     public interface IImageClassificationService
     {
+        /// <summary>
+        /// Runs the classification model on the given image bytes and returns the top prediction.
+        /// </summary>
+        /// <param name="image">Raw image bytes (JPEG, PNG, etc.).</param>
+        /// <param name="fileName">Original file name — used for logging and metadata.</param>
+        /// <returns>The predicted class label and confidence score.</returns>
         ImagePrediction Predict(byte[] image, string fileName);
+
+        /// <summary>Returns metadata about the currently loaded model (version, checksum, labels).</summary>
         ModelInfo GetModelInfo();
+
+        /// <summary>
+        /// Trains a new image classification model from the provided image data set.
+        /// </summary>
+        /// <param name="images">Collection of labelled training images.</param>
+        /// <param name="trainingSetFolder">Path to the folder containing the training image files on disk.</param>
+        /// <param name="modelDestFolderPath">Destination folder where the trained model file will be saved.</param>
+        /// <returns>
+        /// A tuple containing a human-readable training summary string and the list of recognised class labels.
+        /// </returns>
         (string info, string[] labels) Train(IEnumerable<ImageData> images, string trainingSetFolder, string modelDestFolderPath);
     }
 }
diff --git a/src/TailoredApps.Shared.MediatR.ML/Interfaces/Infrastructure/IModelHelper.cs b/src/TailoredApps.Shared.MediatR.ML/Interfaces/Infrastructure/IModelHelper.cs
index 8ce5f36..55936ee 100644
--- a/src/TailoredApps.Shared.MediatR.ML/Interfaces/Infrastructure/IModelHelper.cs
+++ b/src/TailoredApps.Shared.MediatR.ML/Interfaces/Infrastructure/IModelHelper.cs
@@ -1,11 +1,30 @@
-namespace TailoredApps.Shared.MediatR.ImageClassification.Interfaces.Infrastructure
+namespace TailoredApps.Shared.MediatR.ImageClassification.Interfaces.Infrastructure
 {
+    /// <summary>
+    /// Provides helpers for reading and writing metadata embedded inside a trained ML.NET model file.
+    /// </summary>
     public interface IModelHelper
     {
+        /// <summary>Computes and returns the MD5 / SHA checksum of the model file at <paramref name="modelFilePath"/>.</summary>
+        /// <param name="modelFilePath">Absolute path to the model file.</param>
         string GetChecksum(string modelFilePath);
+
+        /// <summary>Reads the version tag stored inside the model file.</summary>
+        /// <param name="modelFilePath">Absolute path to the model file.</param>
         string GetVersion(string modelFilePath);
+
+        /// <summary>Increments and writes a new version tag into the model file.</summary>
+        /// <param name="modelFilePath">Absolute path to the model file.</param>
+        /// <returns>The new version string that was written.</returns>
         string AddVersion(string modelFilePath);
+
+        /// <summary>Embeds the provided class labels into the model file for later retrieval.</summary>
+        /// <param name="modelFilePath">Absolute path to the model file.</param>
+        /// <param name="labels">Array of class label strings to store.</param>
         void AddLabels(string modelFilePath, string[] labels);
+
+        /// <summary>Reads and returns the class labels previously embedded in the model file.</summary>
+        /// <param name="modelFilePath">Absolute path to the model file.</param>
         string[] GetLabels(string modelFilePath);
     }
 }
diff --git a/src/TailoredApps.Shared.MediatR.ML/Interfaces/Infrastructure/IModelInfoService.cs b/src/TailoredApps.Shared.MediatR.ML/Interfaces/Infrastructure/IModelInfoService.cs
index e098129..891806c 100644
--- a/src/TailoredApps.Shared.MediatR.ML/Interfaces/Infrastructure/IModelInfoService.cs
+++ b/src/TailoredApps.Shared.MediatR.ML/Interfaces/Infrastructure/IModelInfoService.cs
@@ -1,11 +1,23 @@
-namespace TailoredApps.Shared.MediatR.ImageClassification.Interfaces.Infrastructure
+namespace TailoredApps.Shared.MediatR.ImageClassification.Interfaces.Infrastructure
 {
+    /// <summary>
+    /// Exposes metadata about the currently loaded image classification model.
+    /// </summary>
     public interface IModelInfoService
     {
+        /// <summary>MD5 / SHA checksum of the model file, used for integrity verification.</summary>
         string ModelChecksum { get; }
+
+        /// <summary>Version string embedded in the model file (e.g. "1.3.0").</summary>
         string ModelVersion { get; }
+
+        /// <summary>Absolute path to the model file on disk.</summary>
         string ModelFilePath { get; }
+
+        /// <summary>File name of the model (without directory path).</summary>
         string ModelFileName { get; }
+
+        /// <summary>Array of class labels the model was trained to recognise.</summary>
         string[] Labels { get; }
     }
 }
diff --git a/src/TailoredApps.Shared.MediatR.ML/Interfaces/Infrastructure/IPredictionEnginePoolAdapter.cs b/src/TailoredApps.Shared.MediatR.ML/Interfaces/Infrastructure/IPredictionEnginePoolAdapter.cs
index 97d9333..eaedbcd 100644
--- a/src/TailoredApps.Shared.MediatR.ML/Interfaces/Infrastructure/IPredictionEnginePoolAdapter.cs
+++ b/src/TailoredApps.Shared.MediatR.ML/Interfaces/Infrastructure/IPredictionEnginePoolAdapter.cs
@@ -1,12 +1,21 @@
-namespace TailoredApps.Shared.MediatR.ImageClassification.Interfaces.Infrastructure
+namespace TailoredApps.Shared.MediatR.ImageClassification.Interfaces.Infrastructure
 {
+    /// <summary>
+    /// Adapter that wraps an ML.NET <c>PredictionEnginePool</c> and exposes a simplified prediction API.
+    /// </summary>
+    /// <typeparam name="TData">Input data type (feature vector).</typeparam>
+    /// <typeparam name="TPrediction">Output prediction type returned by the model.</typeparam>
     public interface IPredictionEnginePoolAdapter<in TData, out TPrediction>
         where TData : class
         where TPrediction : class, new()
-
     {
+        /// <summary>Returns the class labels the underlying model was trained to recognise.</summary>
         string[] GetLabels();
-        TPrediction Predict(TData example);
 
+        /// <summary>
+        /// Runs the model on a single input example and returns the prediction result.
+        /// </summary>
+        /// <param name="example">The input feature vector to classify.</param>
+        TPrediction Predict(TData example);
     }
 }
diff --git a/src/TailoredApps.Shared.MediatR.PagedRequest/PagedAndSortedRequest.cs b/src/TailoredApps.Shared.MediatR.PagedRequest/PagedAndSortedRequest.cs
index 3bb0827..da997fb 100644
--- a/src/TailoredApps.Shared.MediatR.PagedRequest/PagedAndSortedRequest.cs
+++ b/src/TailoredApps.Shared.MediatR.PagedRequest/PagedAndSortedRequest.cs
@@ -1,20 +1,46 @@
-using MediatR;
 using System;
+using MediatR;
 using TailoredApps.Shared.Querying;
 
 namespace TailoredApps.Shared.MediatR.PagedRequest
 {
+    /// <summary>
+    /// Base MediatR request that combines paging and sorting parameters.
+    /// Implement this to pass paged + sorted queries through the MediatR pipeline.
+    /// </summary>
+    /// <typeparam name="TResponse">The response type returned by the handler (must implement <see cref="IPagedResult{TModel}"/>).</typeparam>
+    /// <typeparam name="TQuery">The filter/query object type (must derive from <see cref="QueryBase"/>).</typeparam>
+    /// <typeparam name="TModel">The item type contained in the paged result.</typeparam>
     public class PagedAndSortedRequest<TResponse, TQuery, TModel> : IPagedAndSortedRequest<TResponse, TQuery, TModel>, IRequest<TResponse>
         where TQuery : QueryBase
         where TResponse : IPagedResult<TModel>
     {
+        /// <summary>Requested page number (1-based). Null means no paging.</summary>
         public int? Page { get; set; }
+
+        /// <summary>Number of items per page. Null means no paging.</summary>
         public int? Count { get; set; }
+
+        /// <summary>Returns <c>true</c> when both <see cref="Page"/> and <see cref="Count"/> are specified.</summary>
         public bool IsPagingSpecified => Page.HasValue && Count.HasValue;
+
+        /// <summary>Name of the field to sort by.</summary>
         public string SortField { get; set; }
+
+        /// <summary>Sort direction (ascending or descending). Null means no sorting.</summary>
         public SortDirection? SortDir { get; set; }
+
+        /// <summary>Returns <c>true</c> when both <see cref="SortField"/> and <see cref="SortDir"/> are specified.</summary>
         public bool IsSortingSpecified => !string.IsNullOrWhiteSpace(SortField) && SortDir.HasValue;
+
+        /// <summary>Filter / query criteria applied to the data set.</summary>
         public TQuery Filter { get; set; }
+
+        /// <summary>
+        /// Returns <c>true</c> when <see cref="SortField"/> matches <paramref name="fieldName"/>
+        /// using a case-insensitive comparison.
+        /// </summary>
+        /// <param name="fieldName">The field name to compare against.</param>
         public bool IsSortBy(string fieldName) => string.Equals(SortField, fieldName, StringComparison.InvariantCultureIgnoreCase);
     }
 }
diff --git a/src/TailoredApps.Shared.MediatR/Caching/Cache.cs b/src/TailoredApps.Shared.MediatR/Caching/Cache.cs
index 35f5e07..a5ea7c1 100644
--- a/src/TailoredApps.Shared.MediatR/Caching/Cache.cs
+++ b/src/TailoredApps.Shared.MediatR/Caching/Cache.cs
@@ -1,46 +1,51 @@
-using Microsoft.Extensions.Caching.Distributed;
-using Newtonsoft.Json;
-using System;
-using System.Text;
-using System.Threading;
-using System.Threading.Tasks;
-using TailoredApps.Shared.MediatR.Interfaces.Caching;
-
-namespace TailoredApps.Shared.MediatR.Caching
-{
-    /// <summary>Implementacja <see cref="ICache"/> oparta na <see cref="IDistributedCache"/> z serializacją Newtonsoft.Json.</summary>
-    public class Cache : ICache
-    {
-        private readonly IDistributedCache distributedCache;
-
-        /// <summary>Inicjalizuje instancję <see cref="Cache"/>.</summary>
-        /// <param name="distributedCache">Implementacja distributed cache.</param>
-        public Cache(IDistributedCache distributedCache)
-        {
-            this.distributedCache = distributedCache;
-        }
-
-        /// <inheritdoc/>
-        public async Task<T> GetAsync<T>(string cacheKey, CancellationToken cancellationToken)
-        {
-            var response = await distributedCache.GetAsync(cacheKey, cancellationToken);
-            if (response == null)
-            {
-                return default(T);
-            }
-            var stringData = Encoding.UTF8.GetString(response);
-            var serialized = (T)JsonConvert.DeserializeObject(stringData, typeof(T), new JsonSerializerSettings { NullValueHandling = NullValueHandling.Ignore });
-            return serialized;
-        }
-
-        /// <inheritdoc/>
-        public async Task SetAsync<TResponse>(string cacheKey, TResponse response, TimeSpan? slidingExpiration, DateTime? absoluteExpiration, TimeSpan? absoluteExpirationRelativeToNow, CancellationToken cancellationToken)
-        {
-            var serializedObject = JsonConvert.SerializeObject(response);
-            var bytes = Encoding.UTF8.GetBytes(serializedObject);
-
-            var cacheOptions = new DistributedCacheEntryOptions { AbsoluteExpiration = absoluteExpiration, AbsoluteExpirationRelativeToNow = absoluteExpirationRelativeToNow, SlidingExpiration = slidingExpiration };
-            await distributedCache.SetAsync(cacheKey, bytes, cacheOptions, cancellationToken);
-        }
-    }
-}
+using System;
+using System.Text;
+using System.Threading;
+using System.Threading.Tasks;
+using Microsoft.Extensions.Caching.Distributed;
+using Newtonsoft.Json;
+using TailoredApps.Shared.MediatR.Interfaces.Caching;
+
+namespace TailoredApps.Shared.MediatR.Caching
+{
+    /// <summary>
+    /// Implementation of <see cref="ICache"/> backed by <see cref="IDistributedCache"/>.
+    /// Serializes and deserializes cached objects using Newtonsoft.Json.
+    /// </summary>
+    public class Cache : ICache
+    {
+        private readonly IDistributedCache distributedCache;
+
+        /// <summary>
+        /// Initializes a new instance of <see cref="Cache"/>.
+        /// </summary>
+        /// <param name="distributedCache">The underlying distributed cache implementation.</param>
+        public Cache(IDistributedCache distributedCache)
+        {
+            this.distributedCache = distributedCache;
+        }
+
+        /// <inheritdoc/>
+        public async Task<T> GetAsync<T>(string cacheKey, CancellationToken cancellationToken)
+        {
+            var response = await distributedCache.GetAsync(cacheKey, cancellationToken);
+            if (response == null)
+            {
+                return default(T);
+            }
+            var stringData = Encoding.UTF8.GetString(response);
+            var serialized = (T)JsonConvert.DeserializeObject(stringData, typeof(T), new JsonSerializerSettings { NullValueHandling = NullValueHandling.Ignore });
+            return serialized;
+        }
+
+        /// <inheritdoc/>
+        public async Task SetAsync<TResponse>(string cacheKey, TResponse response, TimeSpan? slidingExpiration, DateTime? absoluteExpiration, TimeSpan? absoluteExpirationRelativeToNow, CancellationToken cancellationToken)
+        {
+            var serializedObject = JsonConvert.SerializeObject(response);
+            var bytes = Encoding.UTF8.GetBytes(serializedObject);
+
+            var cacheOptions = new DistributedCacheEntryOptions { AbsoluteExpiration = absoluteExpiration, AbsoluteExpirationRelativeToNow = absoluteExpirationRelativeToNow, SlidingExpiration = slidingExpiration };
+            await distributedCache.SetAsync(cacheKey, bytes, cacheOptions, cancellationToken);
+        }
+    }
+}
diff --git a/src/TailoredApps.Shared.MediatR/DI/PipelineRegistration.cs b/src/TailoredApps.Shared.MediatR/DI/PipelineRegistration.cs
index 9dce436..78381d5 100644
--- a/src/TailoredApps.Shared.MediatR/DI/PipelineRegistration.cs
+++ b/src/TailoredApps.Shared.MediatR/DI/PipelineRegistration.cs
@@ -1,63 +1,69 @@
-using MediatR;
-using Microsoft.Extensions.DependencyInjection;
-using Scrutor;
-using System.Reflection;
-using TailoredApps.Shared.MediatR.Interfaces.Caching;
-using TailoredApps.Shared.MediatR.Interfaces.DI;
-using TailoredApps.Shared.MediatR.Interfaces.Handlers;
-using TailoredApps.Shared.MediatR.Interfaces.Messages;
-using TailoredApps.Shared.MediatR.PipelineBehaviours;
-
-namespace TailoredApps.Shared.MediatR.DI
-{
-    /// <summary>Implementacja <see cref="IPipelineRegistration"/> rejestrująca pipeline behaviors MediatR w DI.</summary>
-    public class PipelineRegistration : IPipelineRegistration
-    {
-        private readonly IServiceCollection serviceCollection;
-
-        /// <summary>Inicjalizuje instancję <see cref="PipelineRegistration"/>.</summary>
-        /// <param name="serviceCollection">Kolekcja usług DI.</param>
-        public PipelineRegistration(IServiceCollection serviceCollection)
-        {
-            this.serviceCollection = serviceCollection;
-        }
-
-        /// <inheritdoc/>
-        public void RegisterPipelineBehaviors()
-        {
-            // Register MediatR Pipeline Behaviors
-            serviceCollection.AddTransient(typeof(IPipelineBehavior<,>), typeof(LoggingBehavior<,>));
-            serviceCollection.AddTransient(typeof(IPipelineBehavior<,>), typeof(ValidationBehavior<,>));
-            serviceCollection.AddTransient(typeof(IPipelineBehavior<,>), typeof(CachingBehavior<,>));
-            serviceCollection.AddTransient(typeof(IPipelineBehavior<,>), typeof(FallbackBehavior<,>));
-            serviceCollection.AddTransient(typeof(IPipelineBehavior<,>), typeof(RetryBehavior<,>));
-        }
-
-        /// <inheritdoc/>
-        public void RegisterPipelineBehaviors(Assembly assembly)
-        {
-            // ICachePolicy discovery and registration
-            serviceCollection.Scan(scan => scan
-                .FromAssemblies(assembly)
-                .AddClasses(classes => classes.AssignableTo(typeof(ICachePolicy<,>)))
-                .AsImplementedInterfaces()
-                .WithTransientLifetime());
-
-            // IFallbackHandler discovery and registration
-            serviceCollection.Scan(scan => scan
-                .FromAssemblies(assembly)
-                .AddClasses(classes => classes.AssignableTo(typeof(IFallbackHandler<,>)))
-                .UsingRegistrationStrategy(RegistrationStrategy.Skip)
-                .AsImplementedInterfaces()
-                .WithTransientLifetime());
-
-            // IRetryableRequest discovery and registration
-            serviceCollection.Scan(scan => scan
-                .FromAssemblies(assembly)
-                .AddClasses(classes => classes.AssignableTo(typeof(IRetryableRequest<,>)))
-                .UsingRegistrationStrategy(RegistrationStrategy.Skip)
-                .AsImplementedInterfaces()
-                .WithTransientLifetime());
-        }
-    }
-}
+using System.Reflection;
+using MediatR;
+using Microsoft.Extensions.DependencyInjection;
+using Scrutor;
+using TailoredApps.Shared.MediatR.Interfaces.Caching;
+using TailoredApps.Shared.MediatR.Interfaces.DI;
+using TailoredApps.Shared.MediatR.Interfaces.Handlers;
+using TailoredApps.Shared.MediatR.Interfaces.Messages;
+using TailoredApps.Shared.MediatR.PipelineBehaviours;
+
+namespace TailoredApps.Shared.MediatR.DI
+{
+    /// <summary>
+    /// Default implementation of <see cref="IPipelineRegistration"/> that registers all standard
+    /// MediatR pipeline behaviors (Logging, Validation, Caching, Fallback, Retry) into the
+    /// dependency injection container.
+    /// </summary>
+    public class PipelineRegistration : IPipelineRegistration
+    {
+        private readonly IServiceCollection serviceCollection;
+
+        /// <summary>
+        /// Initializes a new instance of <see cref="PipelineRegistration"/>.
+        /// </summary>
+        /// <param name="serviceCollection">The DI service collection to register behaviors into.</param>
+        public PipelineRegistration(IServiceCollection serviceCollection)
+        {
+            this.serviceCollection = serviceCollection;
+        }
+
+        /// <inheritdoc/>
+        public void RegisterPipelineBehaviors()
+        {
+            // Register MediatR Pipeline Behaviors
+            serviceCollection.AddTransient(typeof(IPipelineBehavior<,>), typeof(LoggingBehavior<,>));
+            serviceCollection.AddTransient(typeof(IPipelineBehavior<,>), typeof(ValidationBehavior<,>));
+            serviceCollection.AddTransient(typeof(IPipelineBehavior<,>), typeof(CachingBehavior<,>));
+            serviceCollection.AddTransient(typeof(IPipelineBehavior<,>), typeof(FallbackBehavior<,>));
+            serviceCollection.AddTransient(typeof(IPipelineBehavior<,>), typeof(RetryBehavior<,>));
+        }
+
+        /// <inheritdoc/>
+        public void RegisterPipelineBehaviors(Assembly assembly)
+        {
+            // ICachePolicy discovery and registration
+            serviceCollection.Scan(scan => scan
+                .FromAssemblies(assembly)
+                .AddClasses(classes => classes.AssignableTo(typeof(ICachePolicy<,>)))
+                .AsImplementedInterfaces()
+                .WithTransientLifetime());
+
+            // IFallbackHandler discovery and registration
+            serviceCollection.Scan(scan => scan
+                .FromAssemblies(assembly)
+                .AddClasses(classes => classes.AssignableTo(typeof(IFallbackHandler<,>)))
+                .UsingRegistrationStrategy(RegistrationStrategy.Skip)
+                .AsImplementedInterfaces()
+                .WithTransientLifetime());
+
+            // IRetryableRequest discovery and registration
+            serviceCollection.Scan(scan => scan
+                .FromAssemblies(assembly)
+                .AddClasses(classes => classes.AssignableTo(typeof(IRetryableRequest<,>)))
+                .UsingRegistrationStrategy(RegistrationStrategy.Skip)
+                .AsImplementedInterfaces()
+                .WithTransientLifetime());
+        }
+    }
+}
diff --git a/src/TailoredApps.Shared.MediatR/Interfaces/Caching/ICache.cs b/src/TailoredApps.Shared.MediatR/Interfaces/Caching/ICache.cs
index bcb9e23..81540be 100644
--- a/src/TailoredApps.Shared.MediatR/Interfaces/Caching/ICache.cs
+++ b/src/TailoredApps.Shared.MediatR/Interfaces/Caching/ICache.cs
@@ -1,26 +1,37 @@
-using System;
-using System.Threading;
-using System.Threading.Tasks;
-
-namespace TailoredApps.Shared.MediatR.Interfaces.Caching
-{
-    /// <summary>Wrapper nad <c>IDistributedCache</c> z metodami odczytu i zapisu z serializacją JSON.</summary>
-    public interface ICache
-    {
-        /// <summary>Pobiera i deserializuje wartość z cache.</summary>
-        /// <typeparam name="T">Typ deserializowanego obiektu.</typeparam>
-        /// <param name="cacheKey">Klucz cache.</param>
-        /// <param name="cancellationToken">Token anulowania.</param>
-        Task<T> GetAsync<T>(string cacheKey, CancellationToken cancellationToken);
-
-        /// <summary>Serializuje i zapisuje wartość w cache z opcjonalnymi politykami wygaśnięcia.</summary>
-        /// <typeparam name="TResponse">Typ serializowanego obiektu.</typeparam>
-        /// <param name="cacheKey">Klucz cache.</param>
-        /// <param name="response">Obiekt do zapisania.</param>
-        /// <param name="slidingExpiration">Sliding expiration (opcjonalnie).</param>
-        /// <param name="absoluteExpiration">Absolutna data wygaśnięcia (opcjonalnie).</param>
-        /// <param name="absoluteExpirationRelativeToNow">Absolutna data wygaśnięcia relative to now (opcjonalnie).</param>
-        /// <param name="cancellationToken">Token anulowania.</param>
-        Task SetAsync<TResponse>(string cacheKey, TResponse response, TimeSpan? slidingExpiration, DateTime? absoluteExpiration, TimeSpan? absoluteExpirationRelativeToNow, CancellationToken cancellationToken);
-    }
-}
+using System;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace TailoredApps.Shared.MediatR.Interfaces.Caching
+{
+    /// <summary>
+    /// Abstraction over <c>IDistributedCache</c> that provides typed read and write operations
+    /// with JSON serialization. Use this interface to interact with the underlying cache store
+    /// without coupling to a specific serialization or caching technology.
+    /// </summary>
+    public interface ICache
+    {
+        /// <summary>
+        /// Retrieves a value from the cache and deserializes it to the specified type.
+        /// Returns the default value for <typeparamref name="T"/> if the key is not found.
+        /// </summary>
+        /// <typeparam name="T">The type to deserialize the cached value into.</typeparam>
+        /// <param name="cacheKey">The key used to look up the cached entry.</param>
+        /// <param name="cancellationToken">A token to cancel the asynchronous operation.</param>
+        /// <returns>The deserialized cached value, or <c>default</c> if no entry exists for the key.</returns>
+        Task<T> GetAsync<T>(string cacheKey, CancellationToken cancellationToken);
+
+        /// <summary>
+        /// Serializes the given value and stores it in the cache under the specified key
+        /// with the provided expiration options.
+        /// </summary>
+        /// <typeparam name="TResponse">The type of the object to serialize and cache.</typeparam>
+        /// <param name="cacheKey">The key under which the value will be stored.</param>
+        /// <param name="response">The object to serialize and cache.</param>
+        /// <param name="slidingExpiration">Optional sliding expiration window.</param>
+        /// <param name="absoluteExpiration">Optional absolute expiration date and time.</param>
+        /// <param name="absoluteExpirationRelativeToNow">Optional absolute expiration relative to the current time.</param>
+        /// <param name="cancellationToken">A token to cancel the asynchronous operation.</param>
+        Task SetAsync<TResponse>(string cacheKey, TResponse response, TimeSpan? slidingExpiration, DateTime? absoluteExpiration, TimeSpan? absoluteExpirationRelativeToNow, CancellationToken cancellationToken);
+    }
+}
diff --git a/src/TailoredApps.Shared.MediatR/Interfaces/Caching/ICachePolicy.cs b/src/TailoredApps.Shared.MediatR/Interfaces/Caching/ICachePolicy.cs
index 1f3762b..f8d5e5d 100644
--- a/src/TailoredApps.Shared.MediatR/Interfaces/Caching/ICachePolicy.cs
+++ b/src/TailoredApps.Shared.MediatR/Interfaces/Caching/ICachePolicy.cs
@@ -1,33 +1,48 @@
-using MediatR;
-using System;
-using System.Linq;
-
-namespace TailoredApps.Shared.MediatR.Interfaces.Caching
-{
-    /// <summary>
-    /// Polityka cache'owania dla żądania MediatR.
-    /// Używa domyślnych implementacji interfejsów (C# 8.0).
-    /// </summary>
-    /// <typeparam name="TRequest">Typ żądania MediatR.</typeparam>
-    /// <typeparam name="TResponse">Typ odpowiedzi.</typeparam>
-    public interface ICachePolicy<TRequest, TResponse> where TRequest : IRequest<TResponse>
-    {
-        /// <summary>Absolutna data wygaśnięcia. Domyślnie <c>null</c> (brak ograniczenia).</summary>
-        DateTime? AbsoluteExpiration => null;
-
-        /// <summary>Absolutna data wygaśnięcia relative to now. Domyślnie 5 minut.</summary>
-        TimeSpan? AbsoluteExpirationRelativeToNow => TimeSpan.FromMinutes(5);
-
-        /// <summary>Sliding expiration. Domyślnie 30 sekund.</summary>
-        TimeSpan? SlidingExpiration => TimeSpan.FromSeconds(30);
-
-        /// <summary>Generuje klucz cache na podstawie typu żądania i jego właściwości.</summary>
-        /// <param name="request">Żądanie MediatR.</param>
-        string GetCacheKey(TRequest request)
-        {
-            var r = new { request };
-            var props = r.request.GetType().GetProperties().Select(pi => $"{pi.Name}:{pi.GetValue(r.request, null)}");
-            return $"{typeof(TRequest).FullName}{{{string.Join(",", props)}}}";
-        }
-    }
-}
+using System;
+using System.Linq;
+using MediatR;
+
+namespace TailoredApps.Shared.MediatR.Interfaces.Caching
+{
+    /// <summary>
+    /// Defines the caching policy for a MediatR request/response pair.
+    /// Provides default expiration values via C# 8.0 default interface implementations.
+    /// Implement this interface to customise cache key generation or expiration strategy
+    /// for a specific request type.
+    /// </summary>
+    /// <typeparam name="TRequest">The type of the MediatR request.</typeparam>
+    /// <typeparam name="TResponse">The type of the response.</typeparam>
+    public interface ICachePolicy<TRequest, TResponse> where TRequest : IRequest<TResponse>
+    {
+        /// <summary>
+        /// Gets the absolute expiration date and time for the cache entry.
+        /// Defaults to <c>null</c> (no absolute expiration).
+        /// </summary>
+        DateTime? AbsoluteExpiration => null;
+
+        /// <summary>
+        /// Gets the absolute expiration time relative to now.
+        /// Defaults to <c>5 minutes</c>.
+        /// </summary>
+        TimeSpan? AbsoluteExpirationRelativeToNow => TimeSpan.FromMinutes(5);
+
+        /// <summary>
+        /// Gets the sliding expiration window. The cache entry expires if it has not been
+        /// accessed within this time span. Defaults to <c>30 seconds</c>.
+        /// </summary>
+        TimeSpan? SlidingExpiration => TimeSpan.FromSeconds(30);
+
+        /// <summary>
+        /// Generates a unique cache key based on the fully-qualified request type name
+        /// and the values of all its public properties.
+        /// </summary>
+        /// <param name="request">The MediatR request instance.</param>
+        /// <returns>A string that uniquely identifies this request in the cache.</returns>
+        string GetCacheKey(TRequest request)
+        {
+            var r = new { request };
+            var props = r.request.GetType().GetProperties().Select(pi => $"{pi.Name}:{pi.GetValue(r.request, null)}");
+            return $"{typeof(TRequest).FullName}{{{string.Join(",", props)}}}";
+        }
+    }
+}
diff --git a/src/TailoredApps.Shared.MediatR/Interfaces/DI/IPipelineRegistration.cs b/src/TailoredApps.Shared.MediatR/Interfaces/DI/IPipelineRegistration.cs
index 4da5f1f..6a7db72 100644
--- a/src/TailoredApps.Shared.MediatR/Interfaces/DI/IPipelineRegistration.cs
+++ b/src/TailoredApps.Shared.MediatR/Interfaces/DI/IPipelineRegistration.cs
@@ -1,15 +1,22 @@
-using System.Reflection;
-
-namespace TailoredApps.Shared.MediatR.Interfaces.DI
-{
-    /// <summary>Kontrakt rejestracji pipeline behaviors MediatR.</summary>
-    public interface IPipelineRegistration
-    {
-        /// <summary>Rejestruje domyślne pipeline behaviors (Logging, Validation, Caching, Fallback, Retry).</summary>
-        void RegisterPipelineBehaviors();
-
-        /// <summary>Rejestruje pipeline behaviors i skanuje wskazany assembly w poszukiwaniu polityk cache, fallback i retry.</summary>
-        /// <param name="assembly">Assembly do przeskanowania.</param>
-        void RegisterPipelineBehaviors(Assembly assembly);
-    }
-}
+using System.Reflection;
+
+namespace TailoredApps.Shared.MediatR.Interfaces.DI
+{
+    /// <summary>
+    /// Contract for registering MediatR pipeline behaviors into the dependency injection container.
+    /// </summary>
+    public interface IPipelineRegistration
+    {
+        /// <summary>
+        /// Registers the default set of pipeline behaviors: Logging, Validation, Caching, Fallback, and Retry.
+        /// </summary>
+        void RegisterPipelineBehaviors();
+
+        /// <summary>
+        /// Registers the default pipeline behaviors and additionally scans the specified assembly
+        /// for implementations of cache policies, fallback handlers, and retryable request configurations.
+        /// </summary>
+        /// <param name="assembly">The assembly to scan for policy and handler implementations.</param>
+        void RegisterPipelineBehaviors(Assembly assembly);
+    }
+}
diff --git a/src/TailoredApps.Shared.MediatR/Interfaces/Handlers/IFallbackHandler.cs b/src/TailoredApps.Shared.MediatR/Interfaces/Handlers/IFallbackHandler.cs
index 5005947..4318f15 100644
--- a/src/TailoredApps.Shared.MediatR/Interfaces/Handlers/IFallbackHandler.cs
+++ b/src/TailoredApps.Shared.MediatR/Interfaces/Handlers/IFallbackHandler.cs
@@ -1,17 +1,25 @@
-using MediatR;
-using System.Threading;
-using System.Threading.Tasks;
-
-namespace TailoredApps.Shared.MediatR.Interfaces.Handlers
-{
-    /// <summary>Handler fallback wywoływany przez <c>FallbackBehavior</c> gdy główny handler rzuci wyjątkiem.</summary>
-    /// <typeparam name="TRequest">Typ żądania MediatR.</typeparam>
-    /// <typeparam name="TResponse">Typ odpowiedzi.</typeparam>
-    public interface IFallbackHandler<TRequest, TResponse> where TRequest : IRequest<TResponse>
-    {
-        /// <summary>Obsługuje żądanie w trybie fallback.</summary>
-        /// <param name="request">Oryginalne żądanie.</param>
-        /// <param name="cancellationToken">Token anulowania.</param>
-        Task<TResponse> HandleFallback(TRequest request, CancellationToken cancellationToken);
-    }
-}
+using System.Threading;
+using System.Threading.Tasks;
+using MediatR;
+
+namespace TailoredApps.Shared.MediatR.Interfaces.Handlers
+{
+    /// <summary>
+    /// Fallback handler invoked by <see cref="TailoredApps.Shared.MediatR.PipelineBehaviours.FallbackBehavior{TRequest,TResponse}"/>
+    /// when the primary MediatR handler throws an exception. Implement this interface to provide
+    /// a graceful alternative response instead of propagating the error.
+    /// </summary>
+    /// <typeparam name="TRequest">The type of the MediatR request.</typeparam>
+    /// <typeparam name="TResponse">The type of the response.</typeparam>
+    public interface IFallbackHandler<TRequest, TResponse> where TRequest : IRequest<TResponse>
+    {
+        /// <summary>
+        /// Handles the request in fallback mode, providing an alternative response when the
+        /// primary handler has failed.
+        /// </summary>
+        /// <param name="request">The original MediatR request that triggered the fallback.</param>
+        /// <param name="cancellationToken">A token to cancel the asynchronous operation.</param>
+        /// <returns>A fallback response of type <typeparamref name="TResponse"/>.</returns>
+        Task<TResponse> HandleFallback(TRequest request, CancellationToken cancellationToken);
+    }
+}
diff --git a/src/TailoredApps.Shared.MediatR/Interfaces/Messages/IRetryableRequest.cs b/src/TailoredApps.Shared.MediatR/Interfaces/Messages/IRetryableRequest.cs
index 3b3684a..8fc15a3 100644
--- a/src/TailoredApps.Shared.MediatR/Interfaces/Messages/IRetryableRequest.cs
+++ b/src/TailoredApps.Shared.MediatR/Interfaces/Messages/IRetryableRequest.cs
@@ -1,22 +1,32 @@
-using MediatR;
-
-namespace TailoredApps.Shared.MediatR.Interfaces.Messages
-{
-    /// <summary>Marker interfejsu dla żądań MediatR, które obsługują mechanizm retry i circuit breaker.</summary>
-    /// <typeparam name="TRequest">Typ żądania MediatR.</typeparam>
-    /// <typeparam name="TResponse">Typ odpowiedzi.</typeparam>
-    public interface IRetryableRequest<TRequest, TResponse> where TRequest : IRequest<TResponse>
-    {
-        /// <summary>Liczba prób ponowienia. Domyślnie 1.</summary>
-        int RetryAttempts => 1;
-
-        /// <summary>Opóźnienie między próbami w milisekundach. Domyślnie 250 ms.</summary>
-        int RetryDelay => 250;
-
-        /// <summary>Czy używać exponential backoff przy retry. Domyślnie <c>false</c>.</summary>
-        bool RetryWithExponentialBackoff => false;
-
-        /// <summary>Liczba wyjątków przed otwarciem circuit breakera. Domyślnie 1.</summary>
-        int ExceptionsAllowedBeforeCircuitTrip => 1;
-    }
-}
+using MediatR;
+
+namespace TailoredApps.Shared.MediatR.Interfaces.Messages
+{
+    /// <summary>
+    /// Marker interface for MediatR requests that support retry and circuit-breaker behaviour.
+    /// Implement this interface on a request class (or a dedicated policy class) to configure
+    /// retry attempts, delay, exponential backoff, and circuit-breaker thresholds.
+    /// </summary>
+    /// <typeparam name="TRequest">The type of the MediatR request.</typeparam>
+    /// <typeparam name="TResponse">The type of the response.</typeparam>
+    public interface IRetryableRequest<TRequest, TResponse> where TRequest : IRequest<TResponse>
+    {
+        /// <summary>Gets the number of retry attempts. Defaults to <c>1</c>.</summary>
+        int RetryAttempts => 1;
+
+        /// <summary>Gets the delay between retry attempts in milliseconds. Defaults to <c>250</c> ms.</summary>
+        int RetryDelay => 250;
+
+        /// <summary>
+        /// Gets a value indicating whether exponential backoff should be applied between retries.
+        /// Defaults to <c>false</c>.
+        /// </summary>
+        bool RetryWithExponentialBackoff => false;
+
+        /// <summary>
+        /// Gets the number of consecutive exceptions allowed before the circuit breaker trips.
+        /// Defaults to <c>1</c>.
+        /// </summary>
+        int ExceptionsAllowedBeforeCircuitTrip => 1;
+    }
+}
diff --git a/src/TailoredApps.Shared.MediatR/PipelineBehaviours/CachingBehavior.cs b/src/TailoredApps.Shared.MediatR/PipelineBehaviours/CachingBehavior.cs
index 1d010f4..0b0c9df 100644
--- a/src/TailoredApps.Shared.MediatR/PipelineBehaviours/CachingBehavior.cs
+++ b/src/TailoredApps.Shared.MediatR/PipelineBehaviours/CachingBehavior.cs
@@ -1,18 +1,21 @@
-using MediatR;
-using Microsoft.Extensions.Logging;
 using System.Collections.Generic;
 using System.Linq;
 using System.Threading;
 using System.Threading.Tasks;
+using MediatR;
+using Microsoft.Extensions.Logging;
 using TailoredApps.Shared.MediatR.Interfaces.Caching;
 
 namespace TailoredApps.Shared.MediatR.PipelineBehaviours
 {
     /// <summary>
-    /// MediatR Caching Pipeline Behavior
+    /// MediatR pipeline behavior that provides response caching. Before invoking the next handler,
+    /// it checks whether a cached response already exists for the request. If found, the cached value
+    /// is returned immediately; otherwise the handler is executed and the result is stored in the cache
+    /// according to the active <see cref="ICachePolicy{TRequest,TResponse}"/>.
     /// </summary>
-    /// <typeparam name="TRequest"></typeparam>
-    /// <typeparam name="TResponse"></typeparam>
+    /// <typeparam name="TRequest">The type of the MediatR request.</typeparam>
+    /// <typeparam name="TResponse">The type of the response.</typeparam>
     public class CachingBehavior<TRequest, TResponse> : IPipelineBehavior<TRequest, TResponse> where TRequest : IRequest<TResponse>
     {
         private readonly IEnumerable<ICachePolicy<TRequest, TResponse>> _cachePolicies;
diff --git a/src/TailoredApps.Shared.MediatR/PipelineBehaviours/FallbackBehavior.cs b/src/TailoredApps.Shared.MediatR/PipelineBehaviours/FallbackBehavior.cs
index 3b781fe..c8a3661 100644
--- a/src/TailoredApps.Shared.MediatR/PipelineBehaviours/FallbackBehavior.cs
+++ b/src/TailoredApps.Shared.MediatR/PipelineBehaviours/FallbackBehavior.cs
@@ -1,57 +1,60 @@
-using MediatR;
-using Microsoft.Extensions.Logging;
-using Polly;
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Threading;
-using System.Threading.Tasks;
-using TailoredApps.Shared.MediatR.Interfaces.Handlers;
-
-namespace TailoredApps.Shared.MediatR.PipelineBehaviours
-{
-    /// <summary>
-    /// Pipeline behavior MediatR implementujący fallback — gdy główny handler rzuci wyjątkiem,
-    /// wywołuje zarejestrowany <see cref="IFallbackHandler{TRequest, TResponse}"/>.
-    /// </summary>
-    /// <typeparam name="TRequest">Typ żądania MediatR.</typeparam>
-    /// <typeparam name="TResponse">Typ odpowiedzi.</typeparam>
-    public class FallbackBehavior<TRequest, TResponse> : IPipelineBehavior<TRequest, TResponse>
-        where TRequest : IRequest<TResponse>
-    {
-        private readonly IEnumerable<IFallbackHandler<TRequest, TResponse>> _fallbackHandlers;
-        private readonly ILogger<FallbackBehavior<TRequest, TResponse>> _logger;
-
-        /// <summary>Inicjalizuje instancję <see cref="FallbackBehavior{TRequest, TResponse}"/>.</summary>
-        /// <param name="fallbackHandlers">Kolekcja fallback handlerów.</param>
-        /// <param name="logger">Logger.</param>
-        public FallbackBehavior(IEnumerable<IFallbackHandler<TRequest, TResponse>> fallbackHandlers, ILogger<FallbackBehavior<TRequest, TResponse>> logger)
-        {
-            _fallbackHandlers = fallbackHandlers;
-            _logger = logger;
-        }
-
-        /// <inheritdoc/>
-        public async Task<TResponse> Handle(TRequest request, RequestHandlerDelegate<TResponse> next, CancellationToken cancellationToken)
-        {
-            var fallbackHandler = _fallbackHandlers.FirstOrDefault();
-            if (fallbackHandler == null)
-            {
-                return await next();
-            }
-
-            var fallbackPolicy = Policy<TResponse>
-                .Handle<Exception>()
-                .FallbackAsync(async (cancellationToken) =>
-                {
-                    _logger.LogDebug($"Initial handler failed. Falling back to `{fallbackHandler.GetType().FullName}@HandleFallback`");
-                    return await fallbackHandler.HandleFallback(request, cancellationToken)
-                        .ConfigureAwait(false);
-                });
-
-            var response = await fallbackPolicy.ExecuteAsync(async () => await next());
-
-            return response;
-        }
-    }
-}
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading;
+using System.Threading.Tasks;
+using MediatR;
+using Microsoft.Extensions.Logging;
+using Polly;
+using TailoredApps.Shared.MediatR.Interfaces.Handlers;
+
+namespace TailoredApps.Shared.MediatR.PipelineBehaviours
+{
+    /// <summary>
+    /// MediatR pipeline behavior that implements a fallback strategy. When the primary handler throws
+    /// an exception, the registered <see cref="IFallbackHandler{TRequest, TResponse}"/> is invoked
+    /// to provide an alternative response.
+    /// </summary>
+    /// <typeparam name="TRequest">The type of the MediatR request.</typeparam>
+    /// <typeparam name="TResponse">The type of the response.</typeparam>
+    public class FallbackBehavior<TRequest, TResponse> : IPipelineBehavior<TRequest, TResponse>
+        where TRequest : IRequest<TResponse>
+    {
+        private readonly IEnumerable<IFallbackHandler<TRequest, TResponse>> _fallbackHandlers;
+        private readonly ILogger<FallbackBehavior<TRequest, TResponse>> _logger;
+
+        /// <summary>
+        /// Initializes a new instance of <see cref="FallbackBehavior{TRequest, TResponse}"/>.
+        /// </summary>
+        /// <param name="fallbackHandlers">The collection of fallback handlers registered for this request/response pair.</param>
+        /// <param name="logger">The logger instance used for diagnostic output.</param>
+        public FallbackBehavior(IEnumerable<IFallbackHandler<TRequest, TResponse>> fallbackHandlers, ILogger<FallbackBehavior<TRequest, TResponse>> logger)
+        {
+            _fallbackHandlers = fallbackHandlers;
+            _logger = logger;
+        }
+
+        /// <inheritdoc/>
+        public async Task<TResponse> Handle(TRequest request, RequestHandlerDelegate<TResponse> next, CancellationToken cancellationToken)
+        {
+            var fallbackHandler = _fallbackHandlers.FirstOrDefault();
+            if (fallbackHandler == null)
+            {
+                return await next();
+            }
+
+            var fallbackPolicy = Policy<TResponse>
+                .Handle<Exception>()
+                .FallbackAsync(async (cancellationToken) =>
+                {
+                    _logger.LogDebug($"Initial handler failed. Falling back to `{fallbackHandler.GetType().FullName}@HandleFallback`");
+                    return await fallbackHandler.HandleFallback(request, cancellationToken)
+                        .ConfigureAwait(false);
+                });
+
+            var response = await fallbackPolicy.ExecuteAsync(async () => await next());
+
+            return response;
+        }
+    }
+}
diff --git a/src/TailoredApps.Shared.MediatR/PipelineBehaviours/LoggingBehavior.cs b/src/TailoredApps.Shared.MediatR/PipelineBehaviours/LoggingBehavior.cs
index 9ea7ce4..4f4ae95 100644
--- a/src/TailoredApps.Shared.MediatR/PipelineBehaviours/LoggingBehavior.cs
+++ b/src/TailoredApps.Shared.MediatR/PipelineBehaviours/LoggingBehavior.cs
@@ -1,52 +1,55 @@
-using MediatR;
-using Microsoft.Extensions.Logging;
-using System;
-using System.Text.Json;
-using System.Threading;
-using System.Threading.Tasks;
-
-namespace TailoredApps.Shared.MediatR.PipelineBehaviours
-{
-    /// <summary>
-    /// Pipeline behavior MediatR logujący czas wykonania żądania oraz ewentualne wyjątki.
-    /// </summary>
-    /// <typeparam name="TRequest">Typ żądania MediatR.</typeparam>
-    /// <typeparam name="TResponse">Typ odpowiedzi.</typeparam>
-    public class LoggingBehavior<TRequest, TResponse> : IPipelineBehavior<TRequest, TResponse> where TRequest : IRequest<TResponse>
-    {
-        private readonly ILogger logger;
-
-        /// <summary>Inicjalizuje instancję <see cref="LoggingBehavior{TRequest, TResponse}"/>.</summary>
-        /// <param name="logger">Logger dla żądania.</param>
-        public LoggingBehavior(ILogger<TRequest> logger)
-        {
-            this.logger = logger;
-        }
-
-        /// <inheritdoc/>
-        public async Task<TResponse> Handle(TRequest request, RequestHandlerDelegate<TResponse> next, CancellationToken cancellationToken)
-        {
-            var correlationId = Guid.NewGuid();
-            var timer = new System.Diagnostics.Stopwatch();
-            using (var loggingScope = logger.BeginScope("{MeditatorRequestName} with {MeditatorRequestData}, correlation id {CorrelationId}", typeof(TRequest).Name, JsonSerializer.Serialize(request), correlationId))
-            {
-                try
-                {
-                    logger.LogDebug("Handler for {MeditatorRequestName} starting, correlation id {CorrelationId}", typeof(TRequest).Name, correlationId);
-                    timer.Start();
-                    var result = await next();
-                    timer.Stop();
-                    logger.LogDebug("Handler for {MeditatorRequestName} finished in {ElapsedMilliseconds}ms, correlation id {CorrelationId}", typeof(TRequest).Name, timer.Elapsed.TotalMilliseconds, correlationId);
-
-                    return result;
-                }
-                catch (Exception e)
-                {
-                    timer.Stop();
-                    logger.LogError(e, "Handler for {MeditatorRequestName} failed in {ElapsedMilliseconds}ms, correlation id {CorrelationId}\r\n" + e.StackTrace, typeof(TRequest).Name, timer.Elapsed.TotalMilliseconds, correlationId);
-                    throw;
-                }
-            }
-        }
-    }
-}
+using System;
+using System.Text.Json;
+using System.Threading;
+using System.Threading.Tasks;
+using MediatR;
+using Microsoft.Extensions.Logging;
+
+namespace TailoredApps.Shared.MediatR.PipelineBehaviours
+{
+    /// <summary>
+    /// MediatR pipeline behavior that logs the execution time of every request and captures any
+    /// exceptions that occur during handler processing.
+    /// </summary>
+    /// <typeparam name="TRequest">The type of the MediatR request.</typeparam>
+    /// <typeparam name="TResponse">The type of the response.</typeparam>
+    public class LoggingBehavior<TRequest, TResponse> : IPipelineBehavior<TRequest, TResponse> where TRequest : IRequest<TResponse>
+    {
+        private readonly ILogger logger;
+
+        /// <summary>
+        /// Initializes a new instance of <see cref="LoggingBehavior{TRequest, TResponse}"/>.
+        /// </summary>
+        /// <param name="logger">The logger instance scoped to the request type.</param>
+        public LoggingBehavior(ILogger<TRequest> logger)
+        {
+            this.logger = logger;
+        }
+
+        /// <inheritdoc/>
+        public async Task<TResponse> Handle(TRequest request, RequestHandlerDelegate<TResponse> next, CancellationToken cancellationToken)
+        {
+            var correlationId = Guid.NewGuid();
+            var timer = new System.Diagnostics.Stopwatch();
+            using (var loggingScope = logger.BeginScope("{MeditatorRequestName} with {MeditatorRequestData}, correlation id {CorrelationId}", typeof(TRequest).Name, JsonSerializer.Serialize(request), correlationId))
+            {
+                try
+                {
+                    logger.LogDebug("Handler for {MeditatorRequestName} starting, correlation id {CorrelationId}", typeof(TRequest).Name, correlationId);
+                    timer.Start();
+                    var result = await next();
+                    timer.Stop();
+                    logger.LogDebug("Handler for {MeditatorRequestName} finished in {ElapsedMilliseconds}ms, correlation id {CorrelationId}", typeof(TRequest).Name, timer.Elapsed.TotalMilliseconds, correlationId);
+
+                    return result;
+                }
+                catch (Exception e)
+                {
+                    timer.Stop();
+                    logger.LogError(e, "Handler for {MeditatorRequestName} failed in {ElapsedMilliseconds}ms, correlation id {CorrelationId}\r\n" + e.StackTrace, typeof(TRequest).Name, timer.Elapsed.TotalMilliseconds, correlationId);
+                    throw;
+                }
+            }
+        }
+    }
+}
diff --git a/src/TailoredApps.Shared.MediatR/PipelineBehaviours/RetryBehavior.cs b/src/TailoredApps.Shared.MediatR/PipelineBehaviours/RetryBehavior.cs
index ba278aa..a956103 100644
--- a/src/TailoredApps.Shared.MediatR/PipelineBehaviours/RetryBehavior.cs
+++ b/src/TailoredApps.Shared.MediatR/PipelineBehaviours/RetryBehavior.cs
@@ -1,71 +1,74 @@
-using MediatR;
-using Microsoft.Extensions.Logging;
-using Polly;
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Threading;
-using System.Threading.Tasks;
-using TailoredApps.Shared.MediatR.Interfaces.Messages;
-
-namespace TailoredApps.Shared.MediatR.PipelineBehaviours
-{
-    /// <summary>
-    /// Pipeline behavior MediatR implementujący retry z opcjonalnym exponential backoff i circuit breakerem.
-    /// </summary>
-    /// <typeparam name="TRequest">Typ żądania MediatR.</typeparam>
-    /// <typeparam name="TResponse">Typ odpowiedzi.</typeparam>
-    public class RetryBehavior<TRequest, TResponse> : IPipelineBehavior<TRequest, TResponse> where TRequest : IRequest<TResponse>
-    {
-        private readonly IEnumerable<IRetryableRequest<TRequest, TResponse>> _retryHandlers;
-        private readonly ILogger<RetryBehavior<TRequest, TResponse>> _logger;
-
-        /// <summary>Inicjalizuje instancję <see cref="RetryBehavior{TRequest, TResponse}"/>.</summary>
-        /// <param name="retryHandlers">Kolekcja konfiguracji retry.</param>
-        /// <param name="logger">Logger.</param>
-        public RetryBehavior(IEnumerable<IRetryableRequest<TRequest, TResponse>> retryHandlers, ILogger<RetryBehavior<TRequest, TResponse>> logger)
-        {
-            _retryHandlers = retryHandlers;
-            _logger = logger;
-        }
-
-        /// <inheritdoc/>
-        public async Task<TResponse> Handle(TRequest request, RequestHandlerDelegate<TResponse> next, CancellationToken cancellationToken)
-        {
-            var retryHandler = _retryHandlers.FirstOrDefault();
-            if (retryHandler == null)
-            {
-                // No retry handler found, continue through pipeline
-                return await next();
-            }
-
-            var circuitBreaker = Policy<TResponse>
-                .Handle<Exception>()
-                .CircuitBreakerAsync(retryHandler.ExceptionsAllowedBeforeCircuitTrip, TimeSpan.FromMilliseconds(5000),
-                    (exception, things) =>
-                    {
-                        _logger.LogDebug("Circuit Tripped!");
-                    },
-                    () =>
-                    {
-                    });
-
-            var retryPolicy = Policy<TResponse>
-                .Handle<Exception>()
-                .WaitAndRetryAsync(retryHandler.RetryAttempts, retryAttempt =>
-                {
-                    var retryDelay = retryHandler.RetryWithExponentialBackoff
-                        ? TimeSpan.FromMilliseconds(Math.Pow(2, retryAttempt) * retryHandler.RetryDelay)
-                        : TimeSpan.FromMilliseconds(retryHandler.RetryDelay);
-
-                    _logger.LogDebug($"Retrying, waiting {retryDelay}...");
-
-                    return retryDelay;
-                });
-
-            var response = await retryPolicy.ExecuteAsync(async () => await next());
-
-            return response;
-        }
-    }
-}
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading;
+using System.Threading.Tasks;
+using MediatR;
+using Microsoft.Extensions.Logging;
+using Polly;
+using TailoredApps.Shared.MediatR.Interfaces.Messages;
+
+namespace TailoredApps.Shared.MediatR.PipelineBehaviours
+{
+    /// <summary>
+    /// MediatR pipeline behavior that implements automatic retry with optional exponential backoff
+    /// and a circuit breaker to prevent cascading failures.
+    /// </summary>
+    /// <typeparam name="TRequest">The type of the MediatR request.</typeparam>
+    /// <typeparam name="TResponse">The type of the response.</typeparam>
+    public class RetryBehavior<TRequest, TResponse> : IPipelineBehavior<TRequest, TResponse> where TRequest : IRequest<TResponse>
+    {
+        private readonly IEnumerable<IRetryableRequest<TRequest, TResponse>> _retryHandlers;
+        private readonly ILogger<RetryBehavior<TRequest, TResponse>> _logger;
+
+        /// <summary>
+        /// Initializes a new instance of <see cref="RetryBehavior{TRequest, TResponse}"/>.
+        /// </summary>
+        /// <param name="retryHandlers">The collection of retry configuration handlers registered for this request/response pair.</param>
+        /// <param name="logger">The logger instance used for diagnostic output.</param>
+        public RetryBehavior(IEnumerable<IRetryableRequest<TRequest, TResponse>> retryHandlers, ILogger<RetryBehavior<TRequest, TResponse>> logger)
+        {
+            _retryHandlers = retryHandlers;
+            _logger = logger;
+        }
+
+        /// <inheritdoc/>
+        public async Task<TResponse> Handle(TRequest request, RequestHandlerDelegate<TResponse> next, CancellationToken cancellationToken)
+        {
+            var retryHandler = _retryHandlers.FirstOrDefault();
+            if (retryHandler == null)
+            {
+                // No retry handler found, continue through pipeline
+                return await next();
+            }
+
+            var circuitBreaker = Policy<TResponse>
+                .Handle<Exception>()
+                .CircuitBreakerAsync(retryHandler.ExceptionsAllowedBeforeCircuitTrip, TimeSpan.FromMilliseconds(5000),
+                    (exception, things) =>
+                    {
+                        _logger.LogDebug("Circuit Tripped!");
+                    },
+                    () =>
+                    {
+                    });
+
+            var retryPolicy = Policy<TResponse>
+                .Handle<Exception>()
+                .WaitAndRetryAsync(retryHandler.RetryAttempts, retryAttempt =>
+                {
+                    var retryDelay = retryHandler.RetryWithExponentialBackoff
+                        ? TimeSpan.FromMilliseconds(Math.Pow(2, retryAttempt) * retryHandler.RetryDelay)
+                        : TimeSpan.FromMilliseconds(retryHandler.RetryDelay);
+
+                    _logger.LogDebug($"Retrying, waiting {retryDelay}...");
+
+                    return retryDelay;
+                });
+
+            var response = await retryPolicy.ExecuteAsync(async () => await next());
+
+            return response;
+        }
+    }
+}
diff --git a/src/TailoredApps.Shared.MediatR/PipelineBehaviours/ValidationBehavior.cs b/src/TailoredApps.Shared.MediatR/PipelineBehaviours/ValidationBehavior.cs
index dfe31c2..9048716 100644
--- a/src/TailoredApps.Shared.MediatR/PipelineBehaviours/ValidationBehavior.cs
+++ b/src/TailoredApps.Shared.MediatR/PipelineBehaviours/ValidationBehavior.cs
@@ -1,45 +1,48 @@
-using FluentValidation;
-using MediatR;
-using System.Collections.Generic;
-using System.Linq;
-using System.Threading;
-using System.Threading.Tasks;
-
-namespace TailoredApps.Shared.MediatR.PipelineBehaviours
-{
-    /// <summary>
-    /// Pipeline behavior MediatR uruchamiający wszystkie zarejestrowane walidatory FluentValidation
-    /// przed przekazaniem żądania do handlera.
-    /// </summary>
-    /// <typeparam name="TRequest">Typ żądania MediatR.</typeparam>
-    /// <typeparam name="TResponse">Typ odpowiedzi.</typeparam>
-    public class ValidationBehavior<TRequest, TResponse> : IPipelineBehavior<TRequest, TResponse> where TRequest : IRequest<TResponse>
-    {
-        private readonly IEnumerable<IValidator<TRequest>> _validators;
-
-        /// <summary>Inicjalizuje instancję <see cref="ValidationBehavior{TRequest, TResponse}"/>.</summary>
-        /// <param name="validators">Kolekcja walidatorów dla żądania.</param>
-        public ValidationBehavior(IEnumerable<IValidator<TRequest>> validators)
-        {
-            _validators = validators;
-        }
-
-        /// <inheritdoc/>
-        public async Task<TResponse> Handle(TRequest request, RequestHandlerDelegate<TResponse> next, CancellationToken cancellationToken)
-        {
-            var context = new ValidationContext<TRequest>(request);
-            var failures = _validators
-                .Select(v => v.Validate(context))
-                .SelectMany(result => result.Errors)
-                .Where(f => f != null)
-                .ToList();
-
-            if (failures.Count != 0)
-            {
-                throw new ValidationException(failures);
-            }
-
-            return await next();
-        }
-    }
-}
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading;
+using System.Threading.Tasks;
+using FluentValidation;
+using MediatR;
+
+namespace TailoredApps.Shared.MediatR.PipelineBehaviours
+{
+    /// <summary>
+    /// MediatR pipeline behavior that executes all registered FluentValidation validators
+    /// before the request is forwarded to its handler. Throws a <see cref="ValidationException"/>
+    /// if any validation failures are found.
+    /// </summary>
+    /// <typeparam name="TRequest">The type of the MediatR request.</typeparam>
+    /// <typeparam name="TResponse">The type of the response.</typeparam>
+    public class ValidationBehavior<TRequest, TResponse> : IPipelineBehavior<TRequest, TResponse> where TRequest : IRequest<TResponse>
+    {
+        private readonly IEnumerable<IValidator<TRequest>> _validators;
+
+        /// <summary>
+        /// Initializes a new instance of <see cref="ValidationBehavior{TRequest, TResponse}"/>.
+        /// </summary>
+        /// <param name="validators">The collection of FluentValidation validators registered for the request type.</param>
+        public ValidationBehavior(IEnumerable<IValidator<TRequest>> validators)
+        {
+            _validators = validators;
+        }
+
+        /// <inheritdoc/>
+        public async Task<TResponse> Handle(TRequest request, RequestHandlerDelegate<TResponse> next, CancellationToken cancellationToken)
+        {
+            var context = new ValidationContext<TRequest>(request);
+            var failures = _validators
+                .Select(v => v.Validate(context))
+                .SelectMany(result => result.Errors)
+                .Where(f => f != null)
+                .ToList();
+
+            if (failures.Count != 0)
+            {
+                throw new ValidationException(failures);
+            }
+
+            return await next();
+        }
+    }
+}
diff --git a/src/TailoredApps.Shared.Payments.Provider.Adyen/AdyenProvider.cs b/src/TailoredApps.Shared.Payments.Provider.Adyen/AdyenProvider.cs
index eca4826..117038d 100644
--- a/src/TailoredApps.Shared.Payments.Provider.Adyen/AdyenProvider.cs
+++ b/src/TailoredApps.Shared.Payments.Provider.Adyen/AdyenProvider.cs
@@ -1,374 +1,373 @@
-using System.Net.Http;
-using System.Net.Http.Headers;
-using System.Security.Cryptography;
-using System.Text;
-using System.Text.Json;
-using System.Text.Json.Serialization;
-using Microsoft.Extensions.Configuration;
-using Microsoft.Extensions.DependencyInjection;
-using Microsoft.Extensions.Options;
-
-namespace TailoredApps.Shared.Payments.Provider.Adyen;
-
-// ─── Options ─────────────────────────────────────────────────────────────────
-
-/// <summary>Konfiguracja Adyen Checkout API. Sekcja: <c>Payments:Providers:Adyen</c>.</summary>
-public class AdyenServiceOptions
-{
-    /// <summary>Klucz sekcji konfiguracji.</summary>
-    public static string ConfigurationKey => "Payments:Providers:Adyen";
-
-    /// <summary>Adyen API key (X-API-Key).</summary>
-    public string ApiKey { get; set; } = string.Empty;
-
-    /// <summary>Identyfikator konta merchantskiego.</summary>
-    public string MerchantAccount { get; set; } = string.Empty;
-
-    /// <summary>Client key do Drop-in / Components (opcjonalnie).</summary>
-    public string ClientKey { get; set; } = string.Empty;
-
-    /// <summary>URL powrotu po płatności.</summary>
-    public string ReturnUrl { get; set; } = string.Empty;
-
-    /// <summary>HMAC klucz (hex) do weryfikacji powiadomień webhooka.</summary>
-    public string NotificationHmacKey { get; set; } = string.Empty;
-
-    /// <summary>Adyen environment name, e.g. "test" or "live". Used alongside <see cref="CheckoutUrl"/>.</summary>
-    public string Environment { get; set; } = "test";
-
-    /// <summary>
-    /// Full base URL of the Adyen Checkout API (e.g. "https://checkout-test.adyen.com/v71").
-    /// When set, takes precedence over the value derived from <see cref="IsTest"/>.
-    /// </summary>
-    public string? CheckoutUrl { get; set; }
-
-    /// <summary>
-    /// True = test environment (checkout-test.adyen.com), False = production.
-    /// Ignored when <see cref="CheckoutUrl"/> is explicitly set.
-    /// </summary>
-    public bool IsTest
-    {
-        get => Environment.Equals("test", StringComparison.OrdinalIgnoreCase);
-        set => Environment = value ? "test" : "live";
-    }
-}
-
-// ─── Internal models ─────────────────────────────────────────────────────────
-
-file class AdyenAmount
-{
-    [JsonPropertyName("value")]    public long   Value    { get; set; }
-    [JsonPropertyName("currency")] public string Currency { get; set; } = string.Empty;
-}
-
-file class AdyenSessionRequest
-{
-    [JsonPropertyName("merchantAccount")] public string      MerchantAccount { get; set; } = string.Empty;
-    [JsonPropertyName("amount")]          public AdyenAmount Amount          { get; set; } = new();
-    [JsonPropertyName("reference")]       public string      Reference       { get; set; } = string.Empty;
-    [JsonPropertyName("returnUrl")]       public string      ReturnUrl       { get; set; } = string.Empty;
-    [JsonPropertyName("shopperEmail")]    public string?     ShopperEmail    { get; set; }
-    [JsonPropertyName("countryCode")]     public string?     CountryCode     { get; set; }
-}
-
-file class AdyenSessionResponse
-{
-    [JsonPropertyName("id")]          public string? Id          { get; set; }
-    [JsonPropertyName("sessionData")] public string? SessionData { get; set; }
-    [JsonPropertyName("url")]         public string? Url         { get; set; }
-}
-
-file class AdyenStatusResponse
-{
-    [JsonPropertyName("status")] public string? Status { get; set; }
-    [JsonPropertyName("resultCode")] public string? ResultCode { get; set; }
-}
-
-// ─── Interface ────────────────────────────────────────────────────────────────
-
-/// <summary>Abstrakcja nad Adyen Checkout API v71 (Sessions).</summary>
-public interface IAdyenServiceCaller
-{
-    /// <summary>Tworzy sesję płatności Adyen i zwraca id sesji oraz URL checkout.</summary>
-    Task<(string? sessionId, string? checkoutUrl, string? error)> CreateSessionAsync(PaymentRequest request);
-
-    /// <summary>Pobiera status płatności na podstawie pspReference lub sessionId.</summary>
-    Task<PaymentStatusEnum> GetPaymentStatusAsync(string paymentId);
-
-    /// <summary>Weryfikuje HMAC podpis powiadomienia webhooka.</summary>
-    bool VerifyNotificationHmac(string payload, string hmacSignature);
-}
-
-// ─── Caller ───────────────────────────────────────────────────────────────────
-
-/// <summary>Implementacja <see cref="IAdyenServiceCaller"/> oparta na Adyen Checkout REST API v71.</summary>
-public class AdyenServiceCaller : IAdyenServiceCaller
-{
-    private readonly AdyenServiceOptions options;
-    private readonly IHttpClientFactory httpClientFactory;
-
-    /// <summary>Inicjalizuje instancję <see cref="AdyenServiceCaller"/>.</summary>
-    public AdyenServiceCaller(IOptions<AdyenServiceOptions> options, IHttpClientFactory httpClientFactory)
-    {
-        this.options = options.Value;
-        this.httpClientFactory = httpClientFactory;
-    }
-
-    private string BaseUrl => !string.IsNullOrEmpty(options.CheckoutUrl)
-        ? options.CheckoutUrl
-        : options.IsTest
-            ? "https://checkout-test.adyen.com/v71"
-            : "https://checkout-live.adyen.com/v71";
-
-    private HttpClient CreateClient()
-    {
-        var client = httpClientFactory.CreateClient("Adyen");
-        client.DefaultRequestHeaders.Add("X-API-Key", options.ApiKey);
-        client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
-        return client;
-    }
-
-    /// <inheritdoc/>
-    public async Task<(string? sessionId, string? checkoutUrl, string? error)> CreateSessionAsync(PaymentRequest request)
-    {
-        using var client = CreateClient();
-        var body = new AdyenSessionRequest
-        {
-            MerchantAccount = options.MerchantAccount,
-            Amount          = new AdyenAmount { Value = (long)(request.Amount * 100), Currency = request.Currency.ToUpperInvariant() },
-            Reference       = request.AdditionalData ?? Guid.NewGuid().ToString("N"),
-            ReturnUrl       = options.ReturnUrl,
-            ShopperEmail    = request.Email,
-            CountryCode     = request.Country ?? "PL",
-        };
-        var content  = new StringContent(JsonSerializer.Serialize(body), Encoding.UTF8, "application/json");
-        var response = await client.PostAsync($"{BaseUrl}/sessions", content);
-        var json     = await response.Content.ReadAsStringAsync();
-
-        if (!response.IsSuccessStatusCode)
-            return (null, null, json);
-
-        var result = JsonSerializer.Deserialize<AdyenSessionResponse>(json);
-        return (result?.Id, result?.Url, null);
-    }
-
-    /// <inheritdoc/>
-    public async Task<PaymentStatusEnum> GetPaymentStatusAsync(string paymentId)
-    {
-        using var client = CreateClient();
-        var response = await client.GetAsync($"{BaseUrl}/payments/{paymentId}/details");
-        if (!response.IsSuccessStatusCode) return PaymentStatusEnum.Rejected;
-        var json   = await response.Content.ReadAsStringAsync();
-        var result = JsonSerializer.Deserialize<AdyenStatusResponse>(json);
-        return result?.ResultCode switch
-        {
-            "Authorised" => PaymentStatusEnum.Finished,
-            "Refused"    => PaymentStatusEnum.Rejected,
-            "Cancelled"  => PaymentStatusEnum.Rejected,
-            "Pending"    => PaymentStatusEnum.Processing,
-            "Received"   => PaymentStatusEnum.Processing,
-            _            => PaymentStatusEnum.Created,
-        };
-    }
-
-    /// <inheritdoc/>
-    public bool VerifyNotificationHmac(string payload, string hmacSignature)
-    {
-        try
-        {
-            var keyBytes  = Convert.FromHexString(options.NotificationHmacKey);
-            var dataBytes = Encoding.UTF8.GetBytes(payload);
-            var computed  = Convert.ToBase64String(HMACSHA256.HashData(keyBytes, dataBytes));
-            return string.Equals(computed, hmacSignature, StringComparison.Ordinal);
-        }
-        catch { return false; }
-    }
-}
-
-// ─── Provider ─────────────────────────────────────────────────────────────────
-
-/// <summary>Implementacja <see cref="IPaymentProvider"/> dla Adyen Checkout.</summary>
-public class AdyenProvider : IPaymentProvider, IWebhookPaymentProvider
-{
-    private readonly IAdyenServiceCaller caller;
-
-    /// <summary>Inicjalizuje instancję <see cref="AdyenProvider"/>.</summary>
-    public AdyenProvider(IAdyenServiceCaller caller) => this.caller = caller;
-
-    /// <inheritdoc/>
-    public string Key => "Adyen";
-
-    /// <inheritdoc/>
-    public string Name => "Adyen";
-
-    /// <inheritdoc/>
-    public string Description => "Globalny operator płatności Adyen — karty, BLIK, iDEAL i inne.";
-
-    /// <inheritdoc/>
-    public string Url => "https://www.adyen.com";
-
-    /// <inheritdoc/>
-    public Task<ICollection<PaymentChannel>> GetPaymentChannels(string currency)
-    {
-        ICollection<PaymentChannel> channels = currency.ToUpperInvariant() switch
-        {
-            "PLN" =>
-            [
-                new PaymentChannel { Id = "scheme",           Name = "Karta płatnicza", Description = "Visa, Mastercard", PaymentModel = PaymentModel.OneTime },
-                new PaymentChannel { Id = "blik",             Name = "BLIK",            Description = "BLIK",             PaymentModel = PaymentModel.OneTime },
-                new PaymentChannel { Id = "onlineBanking_PL", Name = "Przelew online",  Description = "Polskie banki",    PaymentModel = PaymentModel.OneTime },
-            ],
-            "EUR" =>
-            [
-                new PaymentChannel { Id = "scheme",          Name = "Karta płatnicza",   Description = "Visa, Mastercard", PaymentModel = PaymentModel.OneTime },
-                new PaymentChannel { Id = "ideal",           Name = "iDEAL",             Description = "Przelew iDEAL",    PaymentModel = PaymentModel.OneTime },
-                new PaymentChannel { Id = "sepadirectdebit", Name = "SEPA Direct Debit", Description = "SEPA",             PaymentModel = PaymentModel.OneTime },
-            ],
-            _ =>
-            [
-                new PaymentChannel { Id = "scheme", Name = "Karta płatnicza", Description = "Visa, Mastercard", PaymentModel = PaymentModel.OneTime },
-            ],
-        };
-        return Task.FromResult(channels);
-    }
-
-    /// <inheritdoc/>
-    public async Task<PaymentResponse> RequestPayment(PaymentRequest request)
-    {
-        var (sessionId, checkoutUrl, error) = await caller.CreateSessionAsync(request);
-
-        if (sessionId is null)
-            return new PaymentResponse { PaymentStatus = PaymentStatusEnum.Rejected, ResponseObject = error };
-
-        return new PaymentResponse
-        {
-            PaymentUniqueId = sessionId,
-            RedirectUrl     = checkoutUrl,
-            PaymentStatus   = PaymentStatusEnum.Created,
-        };
-    }
-
-    /// <inheritdoc/>
-    public async Task<PaymentResponse> GetStatus(string paymentId)
-    {
-        var status = await caller.GetPaymentStatusAsync(paymentId);
-        return new PaymentResponse { PaymentUniqueId = paymentId, PaymentStatus = status };
-    }
-
-    // ─── IWebhookPaymentProvider ─────────────────────────────────────────────
-
-    /// <inheritdoc/>
-    public async Task<PaymentWebhookResult> HandleWebhookAsync(PaymentWebhookRequest request)
-    {
-        var body = request.Body ?? string.Empty;
-        var hmac = request.Headers.TryGetValue("HmacSignature", out var h) ? h.ToString() : string.Empty;
-
-        var payload = new TransactionStatusChangePayload
-        {
-            Payload         = body,
-            QueryParameters = new Dictionary<string, Microsoft.Extensions.Primitives.StringValues>
-            {
-                { "HmacSignature", hmac },
-            },
-        };
-
-        var response = await TransactionStatusChange(payload);
-
-        if (response.PaymentStatus == PaymentStatusEnum.Rejected)
-        {
-            var msg = response.ResponseObject?.ToString() ?? string.Empty;
-            if (msg.Contains("signature", StringComparison.OrdinalIgnoreCase) ||
-                msg.Contains("hash",      StringComparison.OrdinalIgnoreCase) ||
-                msg.Contains("sign",      StringComparison.OrdinalIgnoreCase) ||
-                msg.Contains("hmac",      StringComparison.OrdinalIgnoreCase))
-                return PaymentWebhookResult.Fail(msg);
-        }
-
-        if (response.PaymentStatus == PaymentStatusEnum.Processing && string.IsNullOrEmpty(response.PaymentUniqueId))
-            return PaymentWebhookResult.Ignore("Non-actionable event");
-
-        return PaymentWebhookResult.Ok(response);
-    }
-
-    /// <inheritdoc/>
-    public Task<PaymentResponse> TransactionStatusChange(TransactionStatusChangePayload payload)
-    {
-        var body = payload.Payload?.ToString() ?? string.Empty;
-        var hmac = payload.QueryParameters.TryGetValue("HmacSignature", out var h) ? h.ToString() : string.Empty;
-
-        if (!caller.VerifyNotificationHmac(body, hmac))
-            return Task.FromResult(new PaymentResponse { PaymentStatus = PaymentStatusEnum.Rejected, ResponseObject = "Invalid HMAC" });
-
-        var status = PaymentStatusEnum.Processing;
-        try
-        {
-            var doc  = JsonDocument.Parse(body);
-            var root = doc.RootElement;
-
-            // Adyen sends notifications wrapped in notificationItems array
-            JsonElement item = root;
-            if (root.TryGetProperty("notificationItems", out var items) &&
-                items.GetArrayLength() > 0 &&
-                items[0].TryGetProperty("NotificationRequestItem", out var nri))
-            {
-                item = nri;
-            }
-
-            var eventCode = item.TryGetProperty("eventCode", out var ev) ? ev.GetString() : null;
-            var success   = item.TryGetProperty("success",   out var s)  ? s.GetString()  : "true";
-            var succeeded = !string.Equals(success, "false", StringComparison.OrdinalIgnoreCase);
-
-            status = eventCode switch
-            {
-                "AUTHORISATION"        => succeeded ? PaymentStatusEnum.Finished   : PaymentStatusEnum.Rejected,
-                "CANCELLATION"         => PaymentStatusEnum.Rejected,
-                "REFUND"               => succeeded ? PaymentStatusEnum.Finished   : PaymentStatusEnum.Rejected,
-                "AUTHORISATION_FAILED" => PaymentStatusEnum.Rejected,
-                _                      => PaymentStatusEnum.Processing,
-            };
-        }
-        catch { /* ignore */ }
-
-        return Task.FromResult(new PaymentResponse { PaymentStatus = status, ResponseObject = "OK" });
-    }
-}
-
-// ─── DI ───────────────────────────────────────────────────────────────────────
-
-/// <summary>Rozszerzenia DI dla Adyen.</summary>
-public static class AdyenProviderExtensions
-{
-    /// <summary>Rejestruje <see cref="AdyenProvider"/> i jego zależności w kontenerze DI.</summary>
-    public static void RegisterAdyenProvider(this IServiceCollection services)
-    {
-        services.AddOptions<AdyenServiceOptions>();
-        services.ConfigureOptions<AdyenConfigureOptions>();
-        services.AddHttpClient("Adyen");
-        services.AddTransient<IAdyenServiceCaller, AdyenServiceCaller>();
-        services.AddTransient<AdyenProvider>();
-        services.AddTransient<IPaymentProvider>(sp => sp.GetRequiredService<AdyenProvider>());
-        services.AddTransient<IWebhookPaymentProvider>(sp => sp.GetRequiredService<AdyenProvider>());
-    }
-}
-
-/// <summary>Wczytuje opcje Adyen z konfiguracji aplikacji.</summary>
-public class AdyenConfigureOptions : IConfigureOptions<AdyenServiceOptions>
-{
-    private readonly IConfiguration configuration;
-
-    /// <summary>Inicjalizuje instancję <see cref="AdyenConfigureOptions"/>.</summary>
-    public AdyenConfigureOptions(IConfiguration configuration) => this.configuration = configuration;
-
-    /// <inheritdoc/>
-    public void Configure(AdyenServiceOptions options)
-    {
-        var s = configuration.GetSection(AdyenServiceOptions.ConfigurationKey).Get<AdyenServiceOptions>();
-        if (s is null) return;
-        options.ApiKey              = s.ApiKey;
-        options.MerchantAccount     = s.MerchantAccount;
-        options.ClientKey           = s.ClientKey;
-        options.ReturnUrl           = s.ReturnUrl;
-        options.NotificationHmacKey = s.NotificationHmacKey;
-        options.IsTest              = s.IsTest;
-    }
-}
+using System.Net.Http;
+using System.Net.Http.Headers;
+using System.Security.Cryptography;
+using System.Text;
+using System.Text.Json;
+using System.Text.Json.Serialization;
+using Microsoft.Extensions.Configuration;
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Options;
+
+namespace TailoredApps.Shared.Payments.Provider.Adyen;
+
+// ─── Options ─────────────────────────────────────────────────────────────────
+
+/// <summary>Konfiguracja Adyen Checkout API. Sekcja: <c>Payments:Providers:Adyen</c>.</summary>
+public class AdyenServiceOptions
+{
+    /// <summary>Klucz sekcji konfiguracji.</summary>
+    public static string ConfigurationKey => "Payments:Providers:Adyen";
+
+    /// <summary>Adyen API key (X-API-Key).</summary>
+    public string ApiKey { get; set; } = string.Empty;
+
+    /// <summary>Identyfikator konta merchantskiego.</summary>
+    public string MerchantAccount { get; set; } = string.Empty;
+
+    /// <summary>Client key do Drop-in / Components (opcjonalnie).</summary>
+    public string ClientKey { get; set; } = string.Empty;
+
+    /// <summary>URL powrotu po płatności.</summary>
+    public string ReturnUrl { get; set; } = string.Empty;
+
+    /// <summary>HMAC klucz (hex) do weryfikacji powiadomień webhooka.</summary>
+    public string NotificationHmacKey { get; set; } = string.Empty;
+
+    /// <summary>Adyen environment name, e.g. "test" or "live". Used alongside <see cref="CheckoutUrl"/>.</summary>
+    public string Environment { get; set; } = "test";
+
+    /// <summary>
+    /// Full base URL of the Adyen Checkout API (e.g. "https://checkout-test.adyen.com/v71").
+    /// When set, takes precedence over the value derived from <see cref="IsTest"/>.
+    /// </summary>
+    public string? CheckoutUrl { get; set; }
+
+    /// <summary>
+    /// True = test environment (checkout-test.adyen.com), False = production.
+    /// Ignored when <see cref="CheckoutUrl"/> is explicitly set.
+    /// </summary>
+    public bool IsTest
+    {
+        get => Environment.Equals("test", StringComparison.OrdinalIgnoreCase);
+        set => Environment = value ? "test" : "live";
+    }
+}
+
+// ─── Internal models ─────────────────────────────────────────────────────────
+
+file class AdyenAmount
+{
+    [JsonPropertyName("value")] public long Value { get; set; }
+    [JsonPropertyName("currency")] public string Currency { get; set; } = string.Empty;
+}
+
+file class AdyenSessionRequest
+{
+    [JsonPropertyName("merchantAccount")] public string MerchantAccount { get; set; } = string.Empty;
+    [JsonPropertyName("amount")] public AdyenAmount Amount { get; set; } = new();
+    [JsonPropertyName("reference")] public string Reference { get; set; } = string.Empty;
+    [JsonPropertyName("returnUrl")] public string ReturnUrl { get; set; } = string.Empty;
+    [JsonPropertyName("shopperEmail")] public string? ShopperEmail { get; set; }
+    [JsonPropertyName("countryCode")] public string? CountryCode { get; set; }
+}
+
+file class AdyenSessionResponse
+{
+    [JsonPropertyName("id")] public string? Id { get; set; }
+    [JsonPropertyName("sessionData")] public string? SessionData { get; set; }
+    [JsonPropertyName("url")] public string? Url { get; set; }
+}
+
+file class AdyenStatusResponse
+{
+    [JsonPropertyName("status")] public string? Status { get; set; }
+    [JsonPropertyName("resultCode")] public string? ResultCode { get; set; }
+}
+
+// ─── Interface ────────────────────────────────────────────────────────────────
+
+/// <summary>Abstrakcja nad Adyen Checkout API v71 (Sessions).</summary>
+public interface IAdyenServiceCaller
+{
+    /// <summary>Tworzy sesję płatności Adyen i zwraca id sesji oraz URL checkout.</summary>
+    Task<(string? sessionId, string? checkoutUrl, string? error)> CreateSessionAsync(PaymentRequest request);
+
+    /// <summary>Pobiera status płatności na podstawie pspReference lub sessionId.</summary>
+    Task<PaymentStatusEnum> GetPaymentStatusAsync(string paymentId);
+
+    /// <summary>Weryfikuje HMAC podpis powiadomienia webhooka.</summary>
+    bool VerifyNotificationHmac(string payload, string hmacSignature);
+}
+
+// ─── Caller ───────────────────────────────────────────────────────────────────
+
+/// <summary>Implementacja <see cref="IAdyenServiceCaller"/> oparta na Adyen Checkout REST API v71.</summary>
+public class AdyenServiceCaller : IAdyenServiceCaller
+{
+    private readonly AdyenServiceOptions options;
+    private readonly IHttpClientFactory httpClientFactory;
+
+    /// <summary>Inicjalizuje instancję <see cref="AdyenServiceCaller"/>.</summary>
+    public AdyenServiceCaller(IOptions<AdyenServiceOptions> options, IHttpClientFactory httpClientFactory)
+    {
+        this.options = options.Value;
+        this.httpClientFactory = httpClientFactory;
+    }
+
+    private string BaseUrl => !string.IsNullOrEmpty(options.CheckoutUrl)
+        ? options.CheckoutUrl
+        : options.IsTest
+            ? "https://checkout-test.adyen.com/v71"
+            : "https://checkout-live.adyen.com/v71";
+
+    private HttpClient CreateClient()
+    {
+        var client = httpClientFactory.CreateClient("Adyen");
+        client.DefaultRequestHeaders.Add("X-API-Key", options.ApiKey);
+        client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
+        return client;
+    }
+
+    /// <inheritdoc/>
+    public async Task<(string? sessionId, string? checkoutUrl, string? error)> CreateSessionAsync(PaymentRequest request)
+    {
+        using var client = CreateClient();
+        var body = new AdyenSessionRequest
+        {
+            MerchantAccount = options.MerchantAccount,
+            Amount = new AdyenAmount { Value = (long)(request.Amount * 100), Currency = request.Currency.ToUpperInvariant() },
+            Reference = request.AdditionalData ?? Guid.NewGuid().ToString("N"),
+            ReturnUrl = options.ReturnUrl,
+            ShopperEmail = request.Email,
+            CountryCode = request.Country ?? "PL",
+        };
+        var content = new StringContent(JsonSerializer.Serialize(body), Encoding.UTF8, "application/json");
+        var response = await client.PostAsync($"{BaseUrl}/sessions", content);
+        var json = await response.Content.ReadAsStringAsync();
+
+        if (!response.IsSuccessStatusCode)
+            return (null, null, json);
+
+        var result = JsonSerializer.Deserialize<AdyenSessionResponse>(json);
+        return (result?.Id, result?.Url, null);
+    }
+
+    /// <inheritdoc/>
+    public async Task<PaymentStatusEnum> GetPaymentStatusAsync(string paymentId)
+    {
+        using var client = CreateClient();
+        var response = await client.GetAsync($"{BaseUrl}/payments/{paymentId}/details");
+        if (!response.IsSuccessStatusCode) return PaymentStatusEnum.Rejected;
+        var json = await response.Content.ReadAsStringAsync();
+        var result = JsonSerializer.Deserialize<AdyenStatusResponse>(json);
+        return result?.ResultCode switch
+        {
+            "Authorised" => PaymentStatusEnum.Finished,
+            "Refused" => PaymentStatusEnum.Rejected,
+            "Cancelled" => PaymentStatusEnum.Rejected,
+            "Pending" => PaymentStatusEnum.Processing,
+            "Received" => PaymentStatusEnum.Processing,
+            _ => PaymentStatusEnum.Created,
+        };
+    }
+
+    /// <inheritdoc/>
+    public bool VerifyNotificationHmac(string payload, string hmacSignature)
+    {
+        try
+        {
+            var keyBytes = Convert.FromHexString(options.NotificationHmacKey);
+            var dataBytes = Encoding.UTF8.GetBytes(payload);
+            var computed = Convert.ToBase64String(HMACSHA256.HashData(keyBytes, dataBytes));
+            return string.Equals(computed, hmacSignature, StringComparison.Ordinal);
+        }
+        catch { return false; }
+    }
+}
+
+// ─── Provider ─────────────────────────────────────────────────────────────────
+
+/// <summary>Implementacja <see cref="IPaymentProvider"/> dla Adyen Checkout.</summary>
+public class AdyenProvider : IPaymentProvider, IWebhookPaymentProvider
+{
+    private readonly IAdyenServiceCaller caller;
+
+    /// <summary>Inicjalizuje instancję <see cref="AdyenProvider"/>.</summary>
+    public AdyenProvider(IAdyenServiceCaller caller) => this.caller = caller;
+
+    /// <inheritdoc/>
+    public string Key => "Adyen";
+
+    /// <inheritdoc/>
+    public string Name => "Adyen";
+
+    /// <inheritdoc/>
+    public string Description => "Globalny operator płatności Adyen — karty, BLIK, iDEAL i inne.";
+
+    /// <inheritdoc/>
+    public string Url => "https://www.adyen.com";
+
+    /// <inheritdoc/>
+    public Task<ICollection<PaymentChannel>> GetPaymentChannels(string currency)
+    {
+        ICollection<PaymentChannel> channels = currency.ToUpperInvariant() switch
+        {
+            "PLN" =>
+            [
+                new PaymentChannel { Id = "scheme",           Name = "Karta płatnicza", Description = "Visa, Mastercard", PaymentModel = PaymentModel.OneTime },
+                new PaymentChannel { Id = "blik",             Name = "BLIK",            Description = "BLIK",             PaymentModel = PaymentModel.OneTime },
+                new PaymentChannel { Id = "onlineBanking_PL", Name = "Przelew online",  Description = "Polskie banki",    PaymentModel = PaymentModel.OneTime },
+            ],
+            "EUR" =>
+            [
+                new PaymentChannel { Id = "scheme",          Name = "Karta płatnicza",   Description = "Visa, Mastercard", PaymentModel = PaymentModel.OneTime },
+                new PaymentChannel { Id = "ideal",           Name = "iDEAL",             Description = "Przelew iDEAL",    PaymentModel = PaymentModel.OneTime },
+                new PaymentChannel { Id = "sepadirectdebit", Name = "SEPA Direct Debit", Description = "SEPA",             PaymentModel = PaymentModel.OneTime },
+            ],
+            _ =>
+            [
+                new PaymentChannel { Id = "scheme", Name = "Karta płatnicza", Description = "Visa, Mastercard", PaymentModel = PaymentModel.OneTime },
+            ],
+        };
+        return Task.FromResult(channels);
+    }
+
+    /// <inheritdoc/>
+    public async Task<PaymentResponse> RequestPayment(PaymentRequest request)
+    {
+        var (sessionId, checkoutUrl, error) = await caller.CreateSessionAsync(request);
+
+        if (sessionId is null)
+            return new PaymentResponse { PaymentStatus = PaymentStatusEnum.Rejected, ResponseObject = error };
+
+        return new PaymentResponse
+        {
+            PaymentUniqueId = sessionId,
+            RedirectUrl = checkoutUrl,
+            PaymentStatus = PaymentStatusEnum.Created,
+        };
+    }
+
+    /// <inheritdoc/>
+    public async Task<PaymentResponse> GetStatus(string paymentId)
+    {
+        var status = await caller.GetPaymentStatusAsync(paymentId);
+        return new PaymentResponse { PaymentUniqueId = paymentId, PaymentStatus = status };
+    }
+
+    // ─── IWebhookPaymentProvider ─────────────────────────────────────────────
+
+    /// <inheritdoc/>
+    public async Task<PaymentWebhookResult> HandleWebhookAsync(PaymentWebhookRequest request)
+    {
+        var body = request.Body ?? string.Empty;
+        var hmac = request.Headers.TryGetValue("HmacSignature", out var h) ? h.ToString() : string.Empty;
+
+        var payload = new TransactionStatusChangePayload
+        {
+            Payload = body,
+            QueryParameters = new Dictionary<string, Microsoft.Extensions.Primitives.StringValues>
+            {
+                { "HmacSignature", hmac },
+            },
+        };
+
+        var response = await TransactionStatusChange(payload);
+
+        if (response.PaymentStatus == PaymentStatusEnum.Rejected)
+        {
+            var msg = response.ResponseObject?.ToString() ?? string.Empty;
+            if (msg.Contains("signature", StringComparison.OrdinalIgnoreCase) ||
+                msg.Contains("hash", StringComparison.OrdinalIgnoreCase) ||
+                msg.Contains("sign", StringComparison.OrdinalIgnoreCase) ||
+                msg.Contains("hmac", StringComparison.OrdinalIgnoreCase))
+                return PaymentWebhookResult.Fail(msg);
+        }
+
+        if (response.PaymentStatus == PaymentStatusEnum.Processing && string.IsNullOrEmpty(response.PaymentUniqueId))
+            return PaymentWebhookResult.Ignore("Non-actionable event");
+
+        return PaymentWebhookResult.Ok(response);
+    }
+
+    /// <inheritdoc/>
+    public Task<PaymentResponse> TransactionStatusChange(TransactionStatusChangePayload payload)
+    {
+        var body = payload.Payload?.ToString() ?? string.Empty;
+        var hmac = payload.QueryParameters.TryGetValue("HmacSignature", out var h) ? h.ToString() : string.Empty;
+
+        if (!caller.VerifyNotificationHmac(body, hmac))
+            return Task.FromResult(new PaymentResponse { PaymentStatus = PaymentStatusEnum.Rejected, ResponseObject = "Invalid HMAC" });
+
+        var status = PaymentStatusEnum.Processing;
+        try
+        {
+            var doc = JsonDocument.Parse(body);
+            var root = doc.RootElement;
+
+            // Adyen sends notifications wrapped in notificationItems array
+            JsonElement item = root;
+            if (root.TryGetProperty("notificationItems", out var items) &&
+                items.GetArrayLength() > 0 &&
+                items[0].TryGetProperty("NotificationRequestItem", out var nri))
+            {
+                item = nri;
+            }
+
+            var eventCode = item.TryGetProperty("eventCode", out var ev) ? ev.GetString() : null;
+            var success = item.TryGetProperty("success", out var s) ? s.GetString() : "true";
+            var succeeded = !string.Equals(success, "false", StringComparison.OrdinalIgnoreCase);
+
+            status = eventCode switch
+            {
+                "AUTHORISATION" => succeeded ? PaymentStatusEnum.Finished : PaymentStatusEnum.Rejected,
+                "CANCELLATION" => PaymentStatusEnum.Rejected,
+                "REFUND" => succeeded ? PaymentStatusEnum.Finished : PaymentStatusEnum.Rejected,
+                "AUTHORISATION_FAILED" => PaymentStatusEnum.Rejected,
+                _ => PaymentStatusEnum.Processing,
+            };
+        }
+        catch { /* ignore */ }
+
+        return Task.FromResult(new PaymentResponse { PaymentStatus = status, ResponseObject = "OK" });
+    }
+}
+
+// ─── DI ───────────────────────────────────────────────────────────────────────
+
+/// <summary>Rozszerzenia DI dla Adyen.</summary>
+public static class AdyenProviderExtensions
+{
+    /// <summary>Rejestruje <see cref="AdyenProvider"/> i jego zależności w kontenerze DI.</summary>
+    public static void RegisterAdyenProvider(this IServiceCollection services)
+    {
+        services.AddOptions<AdyenServiceOptions>();
+        services.ConfigureOptions<AdyenConfigureOptions>();
+        services.AddHttpClient("Adyen");
+        services.AddTransient<IAdyenServiceCaller, AdyenServiceCaller>();
+        services.AddTransient<AdyenProvider>();
+        services.AddTransient<IWebhookPaymentProvider>(sp => sp.GetRequiredService<AdyenProvider>());
+    }
+}
+
+/// <summary>Wczytuje opcje Adyen z konfiguracji aplikacji.</summary>
+public class AdyenConfigureOptions : IConfigureOptions<AdyenServiceOptions>
+{
+    private readonly IConfiguration configuration;
+
+    /// <summary>Inicjalizuje instancję <see cref="AdyenConfigureOptions"/>.</summary>
+    public AdyenConfigureOptions(IConfiguration configuration) => this.configuration = configuration;
+
+    /// <inheritdoc/>
+    public void Configure(AdyenServiceOptions options)
+    {
+        var s = configuration.GetSection(AdyenServiceOptions.ConfigurationKey).Get<AdyenServiceOptions>();
+        if (s is null) return;
+        options.ApiKey = s.ApiKey;
+        options.MerchantAccount = s.MerchantAccount;
+        options.ClientKey = s.ClientKey;
+        options.ReturnUrl = s.ReturnUrl;
+        options.NotificationHmacKey = s.NotificationHmacKey;
+        options.IsTest = s.IsTest;
+    }
+}
diff --git a/src/TailoredApps.Shared.Payments.Provider.CashBill/CashBillProvider.cs b/src/TailoredApps.Shared.Payments.Provider.CashBill/CashBillProvider.cs
index c2fd77b..06f0c39 100644
--- a/src/TailoredApps.Shared.Payments.Provider.CashBill/CashBillProvider.cs
+++ b/src/TailoredApps.Shared.Payments.Provider.CashBill/CashBillProvider.cs
@@ -1,11 +1,11 @@
-using Microsoft.Extensions.Configuration;
-using Microsoft.Extensions.DependencyInjection;
-using Microsoft.Extensions.Options;
-using Microsoft.Extensions.Primitives;
 using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Threading.Tasks;
+using Microsoft.Extensions.Configuration;
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Options;
+using Microsoft.Extensions.Primitives;
 using TailoredApps.Shared.Payments;
 using TailoredApps.Shared.Payments.Provider.CashBill.Models;
 using static TailoredApps.Shared.Payments.Provider.CashBill.CashbillServiceCaller;
@@ -20,19 +20,29 @@ namespace TailoredApps.Shared.Payments.Provider.CashBill
     public class CashBillProvider : IPaymentProvider, IWebhookPaymentProvider
     {
         private readonly ICashbillServiceCaller cashbillService;
+        /// <inheritdoc/>
         public CashBillProvider(ICashbillServiceCaller cashbillService)
         {
             this.cashbillService = cashbillService;
         }
         private static string CashBillProviderKey = "Cashbill";
+        /// <inheritdoc/>
         public string Key => CashBillProviderKey;
 
+        /// <inheritdoc/>
         public string Name => CashBillProviderKey;
 
+        /// <inheritdoc/>
         public string Description => "Polski operator płatności jednorazowych.";
 
+        /// <inheritdoc/>
         public string Url => "https://cashbill.pl";
 
+        /// <summary>
+        /// Returns available payment channels from CashBill filtered by the requested currency.
+        /// </summary>
+        /// <param name="currency">ISO 4217 currency code (e.g. "PLN").</param>
+        /// <returns>Collection of <see cref="PaymentChannel"/> objects supported for the given currency.</returns>
         public async Task<ICollection<PaymentChannel>> GetPaymentChannels(string currency)
         {
             var channels = await cashbillService.GetPaymentChannels(currency);
@@ -48,6 +58,14 @@ public async Task<ICollection<PaymentChannel>> GetPaymentChannels(string currenc
             ).ToList();
         }
 
+        /// <summary>
+        /// Initiates a new CashBill payment transaction and returns the provider redirect URL.
+        /// </summary>
+        /// <param name="request">Payment details including amount, currency, and payer data.</param>
+        /// <returns>
+        /// <see cref="PaymentResponse"/> with <see cref="PaymentResponse.RedirectUrl"/> pointing to
+        /// the CashBill hosted payment page and the initial payment status.
+        /// </returns>
         public async Task<PaymentResponse> RequestPayment(Payments.PaymentRequest request)
         {
             var payment = await cashbillService.GeneratePayment(new PaymentRequest
@@ -74,6 +92,11 @@ public async Task<PaymentResponse> RequestPayment(Payments.PaymentRequest reques
         }
 
 
+        /// <summary>
+        /// Retrieves the current status of a CashBill payment by its transaction ID.
+        /// </summary>
+        /// <param name="paymentId">CashBill transaction identifier.</param>
+        /// <returns>Current <see cref="PaymentResponse"/> including the normalised payment status.</returns>
         public async Task<PaymentResponse> GetStatus(string paymentId)
         {
             var payment = await cashbillService.GetPaymentStatus(paymentId);
@@ -102,6 +125,13 @@ private PaymentStatusEnum GetPaymentStatus(string status)
             return key;
         }
 
+        /// <summary>
+        /// Processes a legacy back-channel status-change notification from CashBill.
+        /// Reads <c>cmd</c>, <c>args</c> (transaction ID) and <c>sign</c> from the query parameters,
+        /// then fetches the current payment status from the CashBill API.
+        /// </summary>
+        /// <param name="payload">Payload containing query parameters sent by CashBill.</param>
+        /// <returns>Resolved <see cref="PaymentResponse"/> with the current payment status.</returns>
         public async Task<PaymentResponse> TransactionStatusChange(TransactionStatusChangePayload payload)
         {
             var request = new TransactionStatusChanged
@@ -140,16 +170,16 @@ public async Task<PaymentResponse> TransactionStatusChange(TransactionStatusChan
         /// <param name="request">Unified HTTP webhook request containing query parameters.</param>
         public async Task<PaymentWebhookResult> HandleWebhookAsync(PaymentWebhookRequest request)
         {
-            var cmd           = request.Query.TryGetValue("cmd",  out var c) ? c.ToString() : string.Empty;
+            var cmd = request.Query.TryGetValue("cmd", out var c) ? c.ToString() : string.Empty;
             var transactionId = request.Query.TryGetValue("args", out var a) ? a.ToString() : string.Empty;
-            var sign          = request.Query.TryGetValue("sign", out var s) ? s.ToString() : string.Empty;
+            var sign = request.Query.TryGetValue("sign", out var s) ? s.ToString() : string.Empty;
 
             if (string.IsNullOrEmpty(transactionId))
                 return PaymentWebhookResult.Fail("Missing transactionId (args) in query string.");
 
             // Verify MD5 signature: MD5(cmd + args + shopSecretPhrase)
-            var notification  = new TransactionStatusChanged { Command = cmd, TransactionId = transactionId, Sign = sign };
-            var expectedSign  = await cashbillService.GetSignForNotificationService(notification);
+            var notification = new TransactionStatusChanged { Command = cmd, TransactionId = transactionId, Sign = sign };
+            var expectedSign = await cashbillService.GetSignForNotificationService(notification);
             if (!string.Equals(expectedSign, sign, StringComparison.OrdinalIgnoreCase))
                 return PaymentWebhookResult.Fail($"Invalid signature. expected={expectedSign} got={sign}");
 
@@ -179,21 +209,30 @@ public static void RegisterCashbillProvider(this IServiceCollection services)
 
             // Register as both IPaymentProvider and IWebhookPaymentProvider
             services.AddTransient<CashBillProvider>();
-            services.AddTransient<IPaymentProvider>(sp => sp.GetRequiredService<CashBillProvider>());
             services.AddTransient<IWebhookPaymentProvider>(sp => sp.GetRequiredService<CashBillProvider>());
         }
     }
 
 
 
+    /// <summary>
+    /// Binds <see cref="CashbillServiceOptions"/> from the application configuration
+    /// at the section defined by <see cref="CashbillServiceOptions.ConfigurationKey"/>.
+    /// </summary>
     public class CashbillConfigureOptions : IConfigureOptions<CashbillServiceOptions>
     {
         private readonly IConfiguration configuration;
+
+        /// <summary>
+        /// Initializes a new instance of <see cref="CashbillConfigureOptions"/>.
+        /// </summary>
+        /// <param name="configuration">Application configuration instance.</param>
         public CashbillConfigureOptions(IConfiguration configuration)
         {
             this.configuration = configuration;
         }
 
+        /// <inheritdoc/>
         public void Configure(CashbillServiceOptions options)
         {
             var section = configuration.GetSection(CashbillServiceOptions.ConfigurationKey).Get<CashbillServiceOptions>();
diff --git a/src/TailoredApps.Shared.Payments.Provider.CashBill/CashbillHttpClient.cs b/src/TailoredApps.Shared.Payments.Provider.CashBill/CashbillHttpClient.cs
index c79f0cd..cec3709 100644
--- a/src/TailoredApps.Shared.Payments.Provider.CashBill/CashbillHttpClient.cs
+++ b/src/TailoredApps.Shared.Payments.Provider.CashBill/CashbillHttpClient.cs
@@ -1,4 +1,3 @@
-using Microsoft.Extensions.Logging;
 using System;
 using System.IO;
 using System.Net;
@@ -6,16 +5,29 @@
 using System.Text;
 using System.Text.Json;
 using System.Threading.Tasks;
+using Microsoft.Extensions.Logging;
 
 namespace TailoredApps.Shared.Payments.Provider.CashBill
 {
+    /// <summary>
+    /// Concrete implementation of <see cref="ICashbillHttpClient"/>.
+    /// Sends HTTP requests to the CashBill REST API using <see cref="WebRequest"/>
+    /// with form-encoded payloads.
+    /// </summary>
     public class CashbillHttpClient : ICashbillHttpClient
     {
         private readonly ILogger logger;
+
+        /// <summary>
+        /// Initializes a new instance of <see cref="CashbillHttpClient"/>.
+        /// </summary>
+        /// <param name="logger">Logger instance for error reporting.</param>
         public CashbillHttpClient(ILogger<CashbillHttpClient> logger)
         {
             this.logger = logger;
         }
+
+        /// <inheritdoc/>
         public async Task<T> MakeFormRequest<T>(string url, string method, FormUrlEncodedContent requestFormData)
         {
             try
@@ -71,7 +83,7 @@ public async Task<T> MakeFormRequest<T>(string url, string method, FormUrlEncode
             }
         }
 
-
+        /// <inheritdoc/>
         public async Task MakeFormRequest(string url, string method, FormUrlEncodedContent requestFormData)
         {
             try
diff --git a/src/TailoredApps.Shared.Payments.Provider.CashBill/CashbillServiceCaller.cs b/src/TailoredApps.Shared.Payments.Provider.CashBill/CashbillServiceCaller.cs
index 7e3474f..99ab82e 100644
--- a/src/TailoredApps.Shared.Payments.Provider.CashBill/CashbillServiceCaller.cs
+++ b/src/TailoredApps.Shared.Payments.Provider.CashBill/CashbillServiceCaller.cs
@@ -1,4 +1,3 @@
-using Microsoft.Extensions.Options;
 using System;
 using System.Collections.Generic;
 using System.IO;
@@ -7,15 +6,27 @@
 using System.Security.Cryptography;
 using System.Text;
 using System.Threading.Tasks;
+using Microsoft.Extensions.Options;
 using TailoredApps.Shared.Payments.Provider.CashBill.Models;
 
 namespace TailoredApps.Shared.Payments.Provider.CashBill
 {
+    /// <summary>
+    /// Concrete implementation of <see cref="ICashbillServiceCaller"/>.
+    /// Handles all communication with the CashBill REST API including
+    /// payment creation, status polling, return URL updates, and signature computation.
+    /// </summary>
     public class CashbillServiceCaller : ICashbillServiceCaller
     {
 
         private readonly ICashbillHttpClient cashbillCaller;
         private readonly IOptions<CashbillServiceOptions> options;
+
+        /// <summary>
+        /// Initializes a new instance of <see cref="CashbillServiceCaller"/>.
+        /// </summary>
+        /// <param name="cashbillCaller">Low-level HTTP client for CashBill API requests.</param>
+        /// <param name="options">Bound configuration options for the CashBill provider.</param>
         public CashbillServiceCaller(ICashbillHttpClient cashbillCaller, IOptions<CashbillServiceOptions> options)
         {
             this.cashbillCaller = cashbillCaller;
@@ -44,6 +55,7 @@ private static string HashMd5(string input)
             return BitConverter.ToString(md5.ComputeHash(buffer)).Replace("-", "").ToLower();
         }
 
+        /// <inheritdoc/>
         public async Task<ICollection<PaymentChannels>> GetPaymentChannels(string currency)
         {
             var shopId = options.Value.ShopId;
@@ -53,6 +65,7 @@ public async Task<ICollection<PaymentChannels>> GetPaymentChannels(string curren
             return paymentChannels.Where(x => x.AvailableCurrencies.Any(c => string.Equals(c, currency, StringComparison.InvariantCultureIgnoreCase))).ToList();
         }
 
+        /// <inheritdoc/>
         public async Task<PaymentStatus> GeneratePayment(PaymentRequest request)
         {
             var shopId = options.Value.ShopId;
@@ -115,7 +128,7 @@ public async Task<PaymentStatus> GeneratePayment(PaymentRequest request)
             Payment payment = await cashbillCaller.MakeFormRequest<Payment>(new Uri(mainUrl, $"payment/{shopId}").ToString(), "POST", requestContent);
             returnUrl = new Uri($"{returnUrl}/{payment.Id}");
 
-            ///return url
+            // return url
             var signReturn = Hash(payment.Id + returnUrl + negativeReturnUrl + secretPhrase);
             var requestReturnBrowserContent = new FormUrlEncodedContent(new[]
             {
@@ -132,6 +145,7 @@ public async Task<PaymentStatus> GeneratePayment(PaymentRequest request)
             status.PaymentProviderRedirectUrl = payment.RedirectUrl;
             return status;
         }
+        /// <inheritdoc/>
         public async Task<PaymentStatus> GetPaymentStatus(string paymentId)
         {
             var shopId = options.Value.ShopId;
@@ -143,6 +157,7 @@ public async Task<PaymentStatus> GetPaymentStatus(string paymentId)
 
             return status;
         }
+        /// <inheritdoc/>
         public async Task<string> GetSignForNotificationService(TransactionStatusChanged transactionStatusChanged)
         {
             return await Task.Run(() =>
@@ -157,6 +172,7 @@ public async Task<string> GetSignForNotificationService(TransactionStatusChanged
         }
 
 
+        /// <summary>Well-known CashBill payment status string constants.</summary>
         public static class PaymentStatusConst
         {
             /// <summary>
diff --git a/src/TailoredApps.Shared.Payments.Provider.CashBill/CashbillServiceOptions.cs b/src/TailoredApps.Shared.Payments.Provider.CashBill/CashbillServiceOptions.cs
index 46236df..cf9ad43 100644
--- a/src/TailoredApps.Shared.Payments.Provider.CashBill/CashbillServiceOptions.cs
+++ b/src/TailoredApps.Shared.Payments.Provider.CashBill/CashbillServiceOptions.cs
@@ -1,13 +1,27 @@
-namespace TailoredApps.Shared.Payments.Provider.CashBill
+namespace TailoredApps.Shared.Payments.Provider.CashBill
 {
+    /// <summary>
+    /// Configuration options for the CashBill payment provider.
+    /// Bound from the <c>appsettings.json</c> section identified by <see cref="ConfigurationKey"/>.
+    /// </summary>
     public class CashbillServiceOptions
     {
+        /// <summary>Gets the configuration section key used to bind these options.</summary>
         public static string ConfigurationKey => "Payments:Providers:Cashbill";
 
+        /// <summary>Gets or sets the URL to redirect the payer after a successful payment.</summary>
         public string ReturnUrl { get; set; }
+
+        /// <summary>Gets or sets the URL to redirect the payer after a failed or cancelled payment.</summary>
         public string NegativeReturnUrl { get; set; }
+
+        /// <summary>Gets or sets the base URL of the CashBill REST API.</summary>
         public string ServiceUrl { get; set; }
+
+        /// <summary>Gets or sets the CashBill shop identifier.</summary>
         public string ShopId { get; set; }
+
+        /// <summary>Gets or sets the secret phrase used to sign API requests and verify notifications.</summary>
         public string ShopSecretPhrase { get; set; }
     }
 }
diff --git a/src/TailoredApps.Shared.Payments.Provider.CashBill/ICashbillHttpClient.cs b/src/TailoredApps.Shared.Payments.Provider.CashBill/ICashbillHttpClient.cs
index 02f521d..5ac99d5 100644
--- a/src/TailoredApps.Shared.Payments.Provider.CashBill/ICashbillHttpClient.cs
+++ b/src/TailoredApps.Shared.Payments.Provider.CashBill/ICashbillHttpClient.cs
@@ -1,11 +1,31 @@
-using System.Net.Http;
+using System.Net.Http;
 using System.Threading.Tasks;
 
 namespace TailoredApps.Shared.Payments.Provider.CashBill
 {
+    /// <summary>
+    /// Low-level HTTP client abstraction for communicating with the CashBill REST API.
+    /// Enables mocking in unit tests.
+    /// </summary>
     public interface ICashbillHttpClient
     {
+        /// <summary>
+        /// Sends an HTTP request with form-encoded body and deserializes the response to <typeparamref name="T"/>.
+        /// </summary>
+        /// <typeparam name="T">Expected response model type.</typeparam>
+        /// <param name="url">Absolute URL of the CashBill API endpoint.</param>
+        /// <param name="method">HTTP method (e.g. "GET", "POST", "PUT").</param>
+        /// <param name="requestFormData">Form-encoded content to send with the request; may be <c>null</c> for GET requests.</param>
+        /// <returns>Deserialized response of type <typeparamref name="T"/>.</returns>
         Task<T> MakeFormRequest<T>(string url, string method, FormUrlEncodedContent requestFormData);
+
+        /// <summary>
+        /// Sends an HTTP request with form-encoded body without deserializing the response.
+        /// Used for fire-and-forget calls (e.g. updating return URLs).
+        /// </summary>
+        /// <param name="url">Absolute URL of the CashBill API endpoint.</param>
+        /// <param name="method">HTTP method (e.g. "POST", "PUT").</param>
+        /// <param name="requestFormData">Form-encoded content to send with the request.</param>
         Task MakeFormRequest(string url, string method, FormUrlEncodedContent requestFormData);
     }
 }
diff --git a/src/TailoredApps.Shared.Payments.Provider.CashBill/ICashbillServiceCaller.cs b/src/TailoredApps.Shared.Payments.Provider.CashBill/ICashbillServiceCaller.cs
index 9596e3d..f334db4 100644
--- a/src/TailoredApps.Shared.Payments.Provider.CashBill/ICashbillServiceCaller.cs
+++ b/src/TailoredApps.Shared.Payments.Provider.CashBill/ICashbillServiceCaller.cs
@@ -1,14 +1,42 @@
-using System.Collections.Generic;
+using System.Collections.Generic;
 using System.Threading.Tasks;
 using TailoredApps.Shared.Payments.Provider.CashBill.Models;
 
 namespace TailoredApps.Shared.Payments.Provider.CashBill
 {
+    /// <summary>
+    /// Abstracts the CashBill API operations used by <see cref="CashBillProvider"/>.
+    /// Handles payment creation, status polling, and back-channel signature verification.
+    /// </summary>
     public interface ICashbillServiceCaller
     {
+        /// <summary>
+        /// Creates a new payment in the CashBill system and returns the initial payment status.
+        /// </summary>
+        /// <param name="request">Payment details including amount, currency, and payer data.</param>
+        /// <returns>The initial <see cref="PaymentStatus"/> including the redirect URL.</returns>
         Task<PaymentStatus> GeneratePayment(PaymentRequest request);
+
+        /// <summary>
+        /// Retrieves the list of payment channels available for the given currency.
+        /// </summary>
+        /// <param name="currency">ISO 4217 currency code (e.g. "PLN").</param>
+        /// <returns>Collection of available <see cref="PaymentChannels"/>.</returns>
         Task<ICollection<PaymentChannels>> GetPaymentChannels(string currency);
+
+        /// <summary>
+        /// Retrieves the current status of an existing payment from the CashBill API.
+        /// </summary>
+        /// <param name="paymentId">CashBill transaction identifier.</param>
+        /// <returns>Current <see cref="PaymentStatus"/> for the given payment.</returns>
         Task<PaymentStatus> GetPaymentStatus(string paymentId);
+
+        /// <summary>
+        /// Computes the expected notification signature (MD5) for a back-channel status-change event.
+        /// Used to verify the authenticity of incoming CashBill notifications.
+        /// </summary>
+        /// <param name="transactionStatusChanged">Notification data including command, transaction ID, and received sign.</param>
+        /// <returns>Expected MD5 signature string.</returns>
         Task<string> GetSignForNotificationService(TransactionStatusChanged transactionStatusChanged);
     }
 }
diff --git a/src/TailoredApps.Shared.Payments.Provider.CashBill/Models/Amount.cs b/src/TailoredApps.Shared.Payments.Provider.CashBill/Models/Amount.cs
index fe8d90a..ac71223 100644
--- a/src/TailoredApps.Shared.Payments.Provider.CashBill/Models/Amount.cs
+++ b/src/TailoredApps.Shared.Payments.Provider.CashBill/Models/Amount.cs
@@ -1,12 +1,18 @@
-using System.Text.Json.Serialization;
+using System.Text.Json.Serialization;
 
 namespace TailoredApps.Shared.Payments.Provider.CashBill.Models
 {
+    /// <summary>
+    /// Represents a monetary amount returned by the CashBill API,
+    /// combining a numeric value and the corresponding currency code.
+    /// </summary>
     public class Amount
     {
+        /// <summary>Gets or sets the numeric amount value.</summary>
         [JsonPropertyName("value")]
         public double Value { get; set; }
 
+        /// <summary>Gets or sets the ISO 4217 currency code (e.g. "PLN").</summary>
         [JsonPropertyName("currencyCode")]
         public string CurrencyCode { get; set; }
     }
diff --git a/src/TailoredApps.Shared.Payments.Provider.CashBill/Models/Payment.cs b/src/TailoredApps.Shared.Payments.Provider.CashBill/Models/Payment.cs
index 503899e..604640b 100644
--- a/src/TailoredApps.Shared.Payments.Provider.CashBill/Models/Payment.cs
+++ b/src/TailoredApps.Shared.Payments.Provider.CashBill/Models/Payment.cs
@@ -1,13 +1,18 @@
-using System.Text.Json.Serialization;
+using System.Text.Json.Serialization;
 
 namespace TailoredApps.Shared.Payments.Provider.CashBill.Models
 {
-
+    /// <summary>
+    /// Represents the minimal payment creation response returned by the CashBill API
+    /// after a new payment is submitted (POST /payment/{shopId}).
+    /// </summary>
     public class Payment
     {
+        /// <summary>Gets or sets the CashBill-assigned unique identifier for this payment.</summary>
         [JsonPropertyName("id")]
         public string Id { get; set; }
 
+        /// <summary>Gets or sets the URL to which the payer should be redirected to complete the payment.</summary>
         [JsonPropertyName("redirectUrl")]
         public string RedirectUrl { get; set; }
     }
diff --git a/src/TailoredApps.Shared.Payments.Provider.CashBill/Models/PaymentChannels.cs b/src/TailoredApps.Shared.Payments.Provider.CashBill/Models/PaymentChannels.cs
index 61e9dd4..52a1def 100644
--- a/src/TailoredApps.Shared.Payments.Provider.CashBill/Models/PaymentChannels.cs
+++ b/src/TailoredApps.Shared.Payments.Provider.CashBill/Models/PaymentChannels.cs
@@ -1,23 +1,31 @@
-using System.Collections.Generic;
+using System.Collections.Generic;
 using System.Text.Json.Serialization;
 
 namespace TailoredApps.Shared.Payments.Provider.CashBill.Models
 {
-
+    /// <summary>
+    /// Represents a single payment channel returned by the CashBill
+    /// GET /paymentchannels/{shopId} endpoint.
+    /// </summary>
     public class PaymentChannels
     {
+        /// <summary>Gets or sets the unique identifier of the payment channel.</summary>
         [JsonPropertyName("id")]
         public string Id { get; set; }
 
+        /// <summary>Gets or sets the list of ISO 4217 currency codes accepted by this channel.</summary>
         [JsonPropertyName("availableCurrencies")]
         public List<string> AvailableCurrencies { get; set; }
 
+        /// <summary>Gets or sets the display name of the payment channel.</summary>
         [JsonPropertyName("name")]
         public string Name { get; set; }
 
+        /// <summary>Gets or sets a human-readable description of the payment channel.</summary>
         [JsonPropertyName("description")]
         public string Description { get; set; }
 
+        /// <summary>Gets or sets the URL of the channel's logo image.</summary>
         [JsonPropertyName("logoUrl")]
         public string LogoUrl { get; set; }
     }
diff --git a/src/TailoredApps.Shared.Payments.Provider.CashBill/Models/PaymentStatus.cs b/src/TailoredApps.Shared.Payments.Provider.CashBill/Models/PaymentStatus.cs
index 5595dee..635891d 100644
--- a/src/TailoredApps.Shared.Payments.Provider.CashBill/Models/PaymentStatus.cs
+++ b/src/TailoredApps.Shared.Payments.Provider.CashBill/Models/PaymentStatus.cs
@@ -1,36 +1,53 @@
-using System.Text.Json.Serialization;
+using System.Text.Json.Serialization;
 
 namespace TailoredApps.Shared.Payments.Provider.CashBill.Models
 {
+    /// <summary>
+    /// Represents the full payment status response returned by the CashBill API
+    /// (GET /payment/{shopId}/{paymentId}).
+    /// </summary>
     public class PaymentStatus
     {
+        /// <summary>Gets or sets the CashBill-assigned unique identifier for this payment.</summary>
         [JsonPropertyName("id")]
         public string Id { get; set; }
 
+        /// <summary>Gets or sets the identifier of the payment channel used.</summary>
         [JsonPropertyName("paymentChannel")]
         public string PaymentChannel { get; set; }
 
+        /// <summary>Gets or sets the actual amount processed by the payment channel.</summary>
         [JsonPropertyName("amount")]
         public Amount Amount { get; set; }
 
+        /// <summary>Gets or sets the originally requested amount before any channel adjustments.</summary>
         [JsonPropertyName("requestedAmount")]
         public RequestedAmount RequestedAmount { get; set; }
 
+        /// <summary>Gets or sets the short title or subject of the payment.</summary>
         [JsonPropertyName("title")]
         public string Title { get; set; }
 
+        /// <summary>Gets or sets the detailed description of the payment.</summary>
         [JsonPropertyName("description")]
         public string Description { get; set; }
 
+        /// <summary>Gets or sets the personal data of the payer associated with this payment.</summary>
         [JsonPropertyName("personalData")]
         public PersonalData PersonalData { get; set; }
 
+        /// <summary>Gets or sets any additional data attached when the payment was created.</summary>
         [JsonPropertyName("additionalData")]
         public string AdditionalData { get; set; }
 
+        /// <summary>Gets or sets the current CashBill status string (e.g. "Start", "PositiveFinish").</summary>
         [JsonPropertyName("status")]
         public string Status { get; set; }
 
+        /// <summary>
+        /// Gets or sets the redirect URL to the CashBill payment page.
+        /// This field is populated locally after creation and is not part of the API response.
+        /// </summary>
         [JsonIgnore]
         public string PaymentProviderRedirectUrl { get; set; }
     }
diff --git a/src/TailoredApps.Shared.Payments.Provider.CashBill/Models/PersonalData.cs b/src/TailoredApps.Shared.Payments.Provider.CashBill/Models/PersonalData.cs
index 442f16f..215ea50 100644
--- a/src/TailoredApps.Shared.Payments.Provider.CashBill/Models/PersonalData.cs
+++ b/src/TailoredApps.Shared.Payments.Provider.CashBill/Models/PersonalData.cs
@@ -1,36 +1,49 @@
-using System.Text.Json.Serialization;
+using System.Text.Json.Serialization;
 
 namespace TailoredApps.Shared.Payments.Provider.CashBill.Models
 {
+    /// <summary>
+    /// Represents the payer's personal and contact data as returned by the CashBill API.
+    /// </summary>
     public class PersonalData
     {
+        /// <summary>Gets or sets the payer's first name.</summary>
         [JsonPropertyName("firstName")]
         public string FirstName { get; set; }
 
+        /// <summary>Gets or sets the payer's surname.</summary>
         [JsonPropertyName("surname")]
         public string Surname { get; set; }
 
+        /// <summary>Gets or sets the payer's e-mail address.</summary>
         [JsonPropertyName("email")]
         public string Email { get; set; }
 
+        /// <summary>Gets or sets the ISO 3166-1 alpha-2 country code of the payer's address.</summary>
         [JsonPropertyName("country")]
         public string Country { get; set; }
 
+        /// <summary>Gets or sets the city of the payer's address.</summary>
         [JsonPropertyName("city")]
         public string City { get; set; }
 
+        /// <summary>Gets or sets the postal code of the payer's address.</summary>
         [JsonPropertyName("postcode")]
         public string Postcode { get; set; }
 
+        /// <summary>Gets or sets the street of the payer's address.</summary>
         [JsonPropertyName("street")]
         public string Street { get; set; }
 
+        /// <summary>Gets or sets the house/building number of the payer's address.</summary>
         [JsonPropertyName("house")]
         public string House { get; set; }
 
+        /// <summary>Gets or sets the flat/apartment number of the payer's address.</summary>
         [JsonPropertyName("flat")]
         public string Flat { get; set; }
 
+        /// <summary>Gets or sets the IP address of the payer at the time of the payment.</summary>
         [JsonPropertyName("ip")]
         public string Ip { get; set; }
     }
diff --git a/src/TailoredApps.Shared.Payments.Provider.CashBill/Models/RequestedAmount.cs b/src/TailoredApps.Shared.Payments.Provider.CashBill/Models/RequestedAmount.cs
index f8c5729..97b76c3 100644
--- a/src/TailoredApps.Shared.Payments.Provider.CashBill/Models/RequestedAmount.cs
+++ b/src/TailoredApps.Shared.Payments.Provider.CashBill/Models/RequestedAmount.cs
@@ -1,12 +1,18 @@
-using System.Text.Json.Serialization;
+using System.Text.Json.Serialization;
 
 namespace TailoredApps.Shared.Payments.Provider.CashBill.Models
 {
+    /// <summary>
+    /// Represents the originally requested payment amount before any channel-level adjustments.
+    /// Returned as part of the CashBill payment status response.
+    /// </summary>
     public class RequestedAmount
     {
+        /// <summary>Gets or sets the numeric amount value as originally requested.</summary>
         [JsonPropertyName("value")]
         public double Value { get; set; }
 
+        /// <summary>Gets or sets the ISO 4217 currency code for the requested amount.</summary>
         [JsonPropertyName("currencyCode")]
         public string CurrencyCode { get; set; }
     }
diff --git a/src/TailoredApps.Shared.Payments.Provider.CashBill/Models/TransactionStatusChanged.cs b/src/TailoredApps.Shared.Payments.Provider.CashBill/Models/TransactionStatusChanged.cs
index 3f314d1..23bb739 100644
--- a/src/TailoredApps.Shared.Payments.Provider.CashBill/Models/TransactionStatusChanged.cs
+++ b/src/TailoredApps.Shared.Payments.Provider.CashBill/Models/TransactionStatusChanged.cs
@@ -1,9 +1,28 @@
-namespace TailoredApps.Shared.Payments.Provider.CashBill.Models
+namespace TailoredApps.Shared.Payments.Provider.CashBill.Models
 {
+    /// <summary>
+    /// Represents the back-channel notification payload sent by CashBill
+    /// when a transaction status changes (e.g. payment completed or rejected).
+    /// Parameters are delivered via HTTP query string.
+    /// </summary>
     public class TransactionStatusChanged
     {
+        /// <summary>
+        /// Gets or sets the event command type sent by CashBill (e.g. "transactionStatusChanged").
+        /// Corresponds to the <c>cmd</c> query parameter.
+        /// </summary>
         public string Command { get; set; }
+
+        /// <summary>
+        /// Gets or sets the CashBill transaction identifier for the affected payment.
+        /// Corresponds to the <c>args</c> query parameter.
+        /// </summary>
         public string TransactionId { get; set; }
+
+        /// <summary>
+        /// Gets or sets the MD5 signature sent by CashBill for request authenticity verification.
+        /// Corresponds to the <c>sign</c> query parameter.
+        /// </summary>
         public string Sign { get; set; }
     }
 }
diff --git a/src/TailoredApps.Shared.Payments.Provider.CashBill/PaymentRequest.cs b/src/TailoredApps.Shared.Payments.Provider.CashBill/PaymentRequest.cs
index 9843870..d2255c3 100644
--- a/src/TailoredApps.Shared.Payments.Provider.CashBill/PaymentRequest.cs
+++ b/src/TailoredApps.Shared.Payments.Provider.CashBill/PaymentRequest.cs
@@ -1,22 +1,57 @@
-namespace TailoredApps.Shared.Payments.Provider.CashBill
+namespace TailoredApps.Shared.Payments.Provider.CashBill
 {
+    /// <summary>
+    /// CashBill-specific payment request model passed to <see cref="ICashbillServiceCaller.GeneratePayment"/>.
+    /// Contains all fields required by the CashBill API to create a new payment.
+    /// </summary>
     public class PaymentRequest
     {
+        /// <summary>Gets or sets the identifier of the CashBill payment channel.</summary>
         public string PaymentChannel { get; set; }
+
+        /// <summary>Gets or sets the short title or subject of the payment.</summary>
         public string Title { get; set; }
+
+        /// <summary>Gets or sets the detailed description of the payment shown to the payer.</summary>
         public string Description { get; set; }
+
+        /// <summary>Gets or sets the ISO 4217 currency code (e.g. "PLN").</summary>
         public string Currency { get; set; }
+
+        /// <summary>Gets or sets the payment amount in the specified currency.</summary>
         public decimal Amount { get; set; }
+
+        /// <summary>Gets or sets the payer's e-mail address.</summary>
         public string Email { get; set; }
+
+        /// <summary>Gets or sets the payer's first name.</summary>
         public string FirstName { get; set; }
+
+        /// <summary>Gets or sets the payer's surname.</summary>
         public string Surname { get; set; }
+
+        /// <summary>Gets or sets the payer's street address.</summary>
         public string Street { get; set; }
+
+        /// <summary>Gets or sets the house/building number of the payer's address.</summary>
         public string House { get; set; }
+
+        /// <summary>Gets or sets the flat/apartment number of the payer's address.</summary>
         public string Flat { get; set; }
+
+        /// <summary>Gets or sets the postal code of the payer's address.</summary>
         public string PostCode { get; set; }
+
+        /// <summary>Gets or sets the city of the payer's address.</summary>
         public string City { get; set; }
+
+        /// <summary>Gets or sets the ISO 3166-1 alpha-2 country code of the payer's address.</summary>
         public string Country { get; set; }
+
+        /// <summary>Gets or sets any additional provider-specific data to attach to the payment.</summary>
         public string AdditionalData { get; set; }
+
+        /// <summary>Gets or sets the referrer URL or identifier associated with this payment request.</summary>
         public string Referer { get; set; }
     }
-}
\ No newline at end of file
+}
diff --git a/src/TailoredApps.Shared.Payments.Provider.HotPay/HotPayProvider.cs b/src/TailoredApps.Shared.Payments.Provider.HotPay/HotPayProvider.cs
index 65e9a92..eb9ed69 100644
--- a/src/TailoredApps.Shared.Payments.Provider.HotPay/HotPayProvider.cs
+++ b/src/TailoredApps.Shared.Payments.Provider.HotPay/HotPayProvider.cs
@@ -1,237 +1,239 @@
-using System.Net.Http;
-using System.Security.Cryptography;
-using System.Text;
-using System.Text.Json;
-using System.Text.Json.Serialization;
-using Microsoft.Extensions.Configuration;
-using Microsoft.Extensions.DependencyInjection;
-using Microsoft.Extensions.Options;
-
-namespace TailoredApps.Shared.Payments.Provider.HotPay;
-
-/// <summary>Konfiguracja HotPay. Sekcja: <c>Payments:Providers:HotPay</c>.</summary>
-public class HotPayServiceOptions
-{
-    /// <summary>Klucz sekcji konfiguracji.</summary>
-    public static string ConfigurationKey => "Payments:Providers:HotPay";
-    /// <summary>SecretHash.</summary>
-    public string SecretHash { get; set; } = string.Empty;
-    /// <summary>ServiceUrl.</summary>
-    public string ServiceUrl { get; set; } = "https://platnosci.hotpay.pl";
-    /// <summary>ReturnUrl.</summary>
-    public string ReturnUrl  { get; set; } = string.Empty;
-    /// <summary>NotifyUrl.</summary>
-    public string NotifyUrl  { get; set; } = string.Empty;
-}
-
-file class HotPayRequest
-{
-    [JsonPropertyName("SEKRET")]                  public string Secret      { get; set; } = string.Empty;
-    [JsonPropertyName("KWOTA")]                   public string Amount      { get; set; } = string.Empty;
-    [JsonPropertyName("NAZWA_USLUGI")]            public string ServiceName { get; set; } = string.Empty;
-    [JsonPropertyName("IDENTYFIKATOR_PLATNOSCI")] public string PaymentId   { get; set; } = string.Empty;
-    [JsonPropertyName("ADRES_WWW")]               public string ReturnUrl   { get; set; } = string.Empty;
-    [JsonPropertyName("EMAIL")]                   public string? Email      { get; set; }
-    [JsonPropertyName("HASH")]                    public string Hash        { get; set; } = string.Empty;
-}
-
-file class HotPayResponse
-{
-    [JsonPropertyName("STATUS")]        public string? Status      { get; set; }
-    [JsonPropertyName("PRZEKIERUJ_DO")] public string? RedirectUrl { get; set; }
-    [JsonPropertyName("ID_PLATNOSCI")]  public string? PaymentId   { get; set; }
-}
-
-/// <summary>Abstrakcja nad HotPay API.</summary>
-public interface IHotPayServiceCaller
-{
-    /// <summary>Wywołanie API.</summary>
-    Task<(string? paymentId, string? redirectUrl)> InitPaymentAsync(PaymentRequest request, string paymentId);
-    /// <summary>Weryfikuje podpis powiadomienia.</summary>
-    bool VerifyNotification(string hash, string kwota, string idPlatnosci, string status);
-}
-
-/// <summary>Implementacja <see cref="IHotPayServiceCaller"/>.</summary>
-public class HotPayServiceCaller : IHotPayServiceCaller
-{
-    private readonly HotPayServiceOptions options;
-    private readonly IHttpClientFactory httpClientFactory;
-
-    /// <summary>Inicjalizuje instancję callera.</summary>
-    public HotPayServiceCaller(IOptions<HotPayServiceOptions> options, IHttpClientFactory httpClientFactory)
-    {
-        this.options = options.Value;
-        this.httpClientFactory = httpClientFactory;
-    }
-
-    /// <inheritdoc/>
-    public async Task<(string? paymentId, string? redirectUrl)> InitPaymentAsync(PaymentRequest request, string paymentId)
-    {
-        var amount   = request.Amount.ToString("0.00", System.Globalization.CultureInfo.InvariantCulture);
-        var hashData = $"{options.SecretHash};{amount};{request.Title ?? "Order"};{paymentId};{options.ReturnUrl}";
-        var hash     = Convert.ToHexString(SHA256.HashData(Encoding.UTF8.GetBytes(hashData))).ToLowerInvariant();
-
-        var body = new HotPayRequest
-        {
-            Secret      = options.SecretHash,
-            Amount      = amount,
-            ServiceName = request.Title ?? request.Description ?? "Order",
-            PaymentId   = paymentId,
-            ReturnUrl   = options.ReturnUrl,
-            Email       = request.Email,
-            Hash        = hash,
-        };
-
-        using var client   = httpClientFactory.CreateClient("HotPay");
-        var content  = new StringContent(JsonSerializer.Serialize(body), Encoding.UTF8, "application/json");
-        var response = await client.PostAsync(options.ServiceUrl, content);
-        var json     = await response.Content.ReadAsStringAsync();
-        var result   = JsonSerializer.Deserialize<HotPayResponse>(json);
-        return (result?.PaymentId ?? paymentId, result?.RedirectUrl);
-    }
-
-    /// <inheritdoc/>
-    public bool VerifyNotification(string hash, string kwota, string idPlatnosci, string status)
-    {
-        var data     = $"{options.SecretHash};{kwota};{idPlatnosci};{status}";
-        var computed = Convert.ToHexString(SHA256.HashData(Encoding.UTF8.GetBytes(data))).ToLowerInvariant();
-        return string.Equals(computed, hash, StringComparison.OrdinalIgnoreCase);
-    }
-}
-
-/// <summary>Implementacja <see cref="IPaymentProvider"/> dla HotPay.</summary>
-public class HotPayProvider : IPaymentProvider, IWebhookPaymentProvider
-{
-    private readonly IHotPayServiceCaller caller;
-
-    /// <summary>Inicjalizuje instancję providera.</summary>
-    public HotPayProvider(IHotPayServiceCaller caller) => this.caller = caller;
-
-    public string Key         => "HotPay";
-    public string Name        => "HotPay";
-    /// <inheritdoc/>
-    public string Description => "Operator płatności HotPay — BLIK, karty, przelewy.";
-    public string Url         => "https://hotpay.pl";
-
-    /// <inheritdoc/>
-    public Task<ICollection<PaymentChannel>> GetPaymentChannels(string currency)
-    {
-        ICollection<PaymentChannel> channels =
-        [
-            new PaymentChannel { Id = "blik",     Name = "BLIK",            Description = "BLIK",             PaymentModel = PaymentModel.OneTime },
-            new PaymentChannel { Id = "card",     Name = "Karta płatnicza", Description = "Visa, Mastercard", PaymentModel = PaymentModel.OneTime },
-            new PaymentChannel { Id = "transfer", Name = "Przelew online",  Description = "Przelew bankowy",  PaymentModel = PaymentModel.OneTime },
-        ];
-        return Task.FromResult(channels);
-    }
-
-    /// <inheritdoc/>
-    public async Task<PaymentResponse> RequestPayment(PaymentRequest request)
-    {
-        var paymentId = Guid.NewGuid().ToString("N");
-        var (resultId, redirectUrl) = await caller.InitPaymentAsync(request, paymentId);
-
-        if (resultId is null && redirectUrl is null)
-            return new PaymentResponse { PaymentStatus = PaymentStatusEnum.Rejected, ResponseObject = "API error" };
-
-        return new PaymentResponse
-        {
-            PaymentUniqueId = resultId,
-            RedirectUrl     = redirectUrl,
-            PaymentStatus   = PaymentStatusEnum.Created,
-        };
-    }
-
-    /// <inheritdoc/>
-    public Task<PaymentResponse> GetStatus(string paymentId)
-        => Task.FromResult(new PaymentResponse { PaymentUniqueId = paymentId, PaymentStatus = PaymentStatusEnum.Processing });
-
-    // ─── IWebhookPaymentProvider ─────────────────────────────────────────────
-
-    /// <inheritdoc/>
-    public async Task<PaymentWebhookResult> HandleWebhookAsync(PaymentWebhookRequest request)
-    {
-        var hash        = request.Query.TryGetValue("HASH",         out var h) ? h.ToString() : string.Empty;
-        var kwota       = request.Query.TryGetValue("KWOTA",        out var k) ? k.ToString() : string.Empty;
-        var idPlatnosci = request.Query.TryGetValue("ID_PLATNOSCI", out var i) ? i.ToString() : string.Empty;
-        var status      = request.Query.TryGetValue("STATUS",       out var s) ? s.ToString() : string.Empty;
-
-        var payload = new TransactionStatusChangePayload
-        {
-            QueryParameters = new Dictionary<string, Microsoft.Extensions.Primitives.StringValues>
-            {
-                { "HASH",         hash        },
-                { "KWOTA",        kwota       },
-                { "ID_PLATNOSCI", idPlatnosci },
-                { "STATUS",       status      },
-            },
-        };
-
-        var response = await TransactionStatusChange(payload);
-
-        if (response.PaymentStatus == PaymentStatusEnum.Rejected)
-        {
-            var msg = response.ResponseObject?.ToString() ?? string.Empty;
-            if (msg.Contains("signature", StringComparison.OrdinalIgnoreCase) ||
-                msg.Contains("hash",      StringComparison.OrdinalIgnoreCase) ||
-                msg.Contains("sign",      StringComparison.OrdinalIgnoreCase) ||
-                msg.Contains("hmac",      StringComparison.OrdinalIgnoreCase))
-                return PaymentWebhookResult.Fail(msg);
-        }
-
-        if (response.PaymentStatus == PaymentStatusEnum.Processing && string.IsNullOrEmpty(response.PaymentUniqueId))
-            return PaymentWebhookResult.Ignore("Non-actionable event");
-
-        return PaymentWebhookResult.Ok(response);
-    }
-
-    /// <inheritdoc/>
-    public Task<PaymentResponse> TransactionStatusChange(TransactionStatusChangePayload payload)
-    {
-        var qs = payload.QueryParameters;
-        var hash        = qs.TryGetValue("HASH",          out var h) ? h.ToString() : string.Empty;
-        var kwota       = qs.TryGetValue("KWOTA",         out var k) ? k.ToString() : string.Empty;
-        var idPlatnosci = qs.TryGetValue("ID_PLATNOSCI",  out var i) ? i.ToString() : string.Empty;
-        var status      = qs.TryGetValue("STATUS",        out var s) ? s.ToString() : string.Empty;
-
-        if (!caller.VerifyNotification(hash, kwota, idPlatnosci, status))
-            return Task.FromResult(new PaymentResponse { PaymentStatus = PaymentStatusEnum.Rejected, ResponseObject = "Invalid hash" });
-
-        var payStatus = status == "SUCCESS" ? PaymentStatusEnum.Finished : PaymentStatusEnum.Rejected;
-        return Task.FromResult(new PaymentResponse { PaymentUniqueId = idPlatnosci, PaymentStatus = payStatus, ResponseObject = "OK" });
-    }
-}
-
-/// <summary>Rozszerzenia DI dla HotPay.</summary>
-public static class HotPayProviderExtensions
-{
-    /// <summary>Rejestruje provider i jego zależności w kontenerze DI.</summary>
-    public static void RegisterHotPayProvider(this IServiceCollection services)
-    {
-        services.AddOptions<HotPayServiceOptions>();
-        services.ConfigureOptions<HotPayConfigureOptions>();
-        services.AddHttpClient("HotPay");
-        services.AddTransient<IHotPayServiceCaller, HotPayServiceCaller>();
-        services.AddTransient<HotPayProvider>();
-        services.AddTransient<IPaymentProvider>(sp => sp.GetRequiredService<HotPayProvider>());
-        services.AddTransient<IWebhookPaymentProvider>(sp => sp.GetRequiredService<HotPayProvider>());
-    }
-}
-
-/// <summary>Wczytuje opcje HotPay z konfiguracji.</summary>
-public class HotPayConfigureOptions : IConfigureOptions<HotPayServiceOptions>
-{
-    private readonly IConfiguration configuration;
-    /// <summary>Inicjalizuje instancję konfiguracji.</summary>
-    public HotPayConfigureOptions(IConfiguration configuration) => this.configuration = configuration;
-    /// <inheritdoc/>
-    public void Configure(HotPayServiceOptions options)
-    {
-        var s = configuration.GetSection(HotPayServiceOptions.ConfigurationKey).Get<HotPayServiceOptions>();
-        if (s is null) return;
-        options.SecretHash = s.SecretHash;
-        options.ServiceUrl = s.ServiceUrl;
-        options.ReturnUrl  = s.ReturnUrl;
-        options.NotifyUrl  = s.NotifyUrl;
-    }
-}
+using System.Net.Http;
+using System.Security.Cryptography;
+using System.Text;
+using System.Text.Json;
+using System.Text.Json.Serialization;
+using Microsoft.Extensions.Configuration;
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Options;
+
+namespace TailoredApps.Shared.Payments.Provider.HotPay;
+
+/// <summary>Konfiguracja HotPay. Sekcja: <c>Payments:Providers:HotPay</c>.</summary>
+public class HotPayServiceOptions
+{
+    /// <summary>Klucz sekcji konfiguracji.</summary>
+    public static string ConfigurationKey => "Payments:Providers:HotPay";
+    /// <summary>SecretHash.</summary>
+    public string SecretHash { get; set; } = string.Empty;
+    /// <summary>ServiceUrl.</summary>
+    public string ServiceUrl { get; set; } = "https://platnosci.hotpay.pl";
+    /// <summary>ReturnUrl.</summary>
+    public string ReturnUrl { get; set; } = string.Empty;
+    /// <summary>NotifyUrl.</summary>
+    public string NotifyUrl { get; set; } = string.Empty;
+}
+
+file class HotPayRequest
+{
+    [JsonPropertyName("SEKRET")] public string Secret { get; set; } = string.Empty;
+    [JsonPropertyName("KWOTA")] public string Amount { get; set; } = string.Empty;
+    [JsonPropertyName("NAZWA_USLUGI")] public string ServiceName { get; set; } = string.Empty;
+    [JsonPropertyName("IDENTYFIKATOR_PLATNOSCI")] public string PaymentId { get; set; } = string.Empty;
+    [JsonPropertyName("ADRES_WWW")] public string ReturnUrl { get; set; } = string.Empty;
+    [JsonPropertyName("EMAIL")] public string? Email { get; set; }
+    [JsonPropertyName("HASH")] public string Hash { get; set; } = string.Empty;
+}
+
+file class HotPayResponse
+{
+    [JsonPropertyName("STATUS")] public string? Status { get; set; }
+    [JsonPropertyName("PRZEKIERUJ_DO")] public string? RedirectUrl { get; set; }
+    [JsonPropertyName("ID_PLATNOSCI")] public string? PaymentId { get; set; }
+}
+
+/// <summary>Abstrakcja nad HotPay API.</summary>
+public interface IHotPayServiceCaller
+{
+    /// <summary>Wywołanie API.</summary>
+    Task<(string? paymentId, string? redirectUrl)> InitPaymentAsync(PaymentRequest request, string paymentId);
+    /// <summary>Weryfikuje podpis powiadomienia.</summary>
+    bool VerifyNotification(string hash, string kwota, string idPlatnosci, string status);
+}
+
+/// <summary>Implementacja <see cref="IHotPayServiceCaller"/>.</summary>
+public class HotPayServiceCaller : IHotPayServiceCaller
+{
+    private readonly HotPayServiceOptions options;
+    private readonly IHttpClientFactory httpClientFactory;
+
+    /// <summary>Inicjalizuje instancję callera.</summary>
+    public HotPayServiceCaller(IOptions<HotPayServiceOptions> options, IHttpClientFactory httpClientFactory)
+    {
+        this.options = options.Value;
+        this.httpClientFactory = httpClientFactory;
+    }
+
+    /// <inheritdoc/>
+    public async Task<(string? paymentId, string? redirectUrl)> InitPaymentAsync(PaymentRequest request, string paymentId)
+    {
+        var amount = request.Amount.ToString("0.00", System.Globalization.CultureInfo.InvariantCulture);
+        var hashData = $"{options.SecretHash};{amount};{request.Title ?? "Order"};{paymentId};{options.ReturnUrl}";
+        var hash = Convert.ToHexString(SHA256.HashData(Encoding.UTF8.GetBytes(hashData))).ToLowerInvariant();
+
+        var body = new HotPayRequest
+        {
+            Secret = options.SecretHash,
+            Amount = amount,
+            ServiceName = request.Title ?? request.Description ?? "Order",
+            PaymentId = paymentId,
+            ReturnUrl = options.ReturnUrl,
+            Email = request.Email,
+            Hash = hash,
+        };
+
+        using var client = httpClientFactory.CreateClient("HotPay");
+        var content = new StringContent(JsonSerializer.Serialize(body), Encoding.UTF8, "application/json");
+        var response = await client.PostAsync(options.ServiceUrl, content);
+        var json = await response.Content.ReadAsStringAsync();
+        var result = JsonSerializer.Deserialize<HotPayResponse>(json);
+        return (result?.PaymentId ?? paymentId, result?.RedirectUrl);
+    }
+
+    /// <inheritdoc/>
+    public bool VerifyNotification(string hash, string kwota, string idPlatnosci, string status)
+    {
+        var data = $"{options.SecretHash};{kwota};{idPlatnosci};{status}";
+        var computed = Convert.ToHexString(SHA256.HashData(Encoding.UTF8.GetBytes(data))).ToLowerInvariant();
+        return string.Equals(computed, hash, StringComparison.OrdinalIgnoreCase);
+    }
+}
+
+/// <summary>Implementacja <see cref="IPaymentProvider"/> dla HotPay.</summary>
+public class HotPayProvider : IPaymentProvider, IWebhookPaymentProvider
+{
+    private readonly IHotPayServiceCaller caller;
+
+    /// <summary>Inicjalizuje instancję providera.</summary>
+    public HotPayProvider(IHotPayServiceCaller caller) => this.caller = caller;
+
+    /// <inheritdoc/>
+    public string Key => "HotPay";
+    /// <inheritdoc/>
+    public string Name => "HotPay";
+    /// <inheritdoc/>
+    public string Description => "Operator płatności HotPay — BLIK, karty, przelewy.";
+    /// <inheritdoc/>
+    public string Url => "https://hotpay.pl";
+
+    /// <inheritdoc/>
+    public Task<ICollection<PaymentChannel>> GetPaymentChannels(string currency)
+    {
+        ICollection<PaymentChannel> channels =
+        [
+            new PaymentChannel { Id = "blik",     Name = "BLIK",            Description = "BLIK",             PaymentModel = PaymentModel.OneTime },
+            new PaymentChannel { Id = "card",     Name = "Karta płatnicza", Description = "Visa, Mastercard", PaymentModel = PaymentModel.OneTime },
+            new PaymentChannel { Id = "transfer", Name = "Przelew online",  Description = "Przelew bankowy",  PaymentModel = PaymentModel.OneTime },
+        ];
+        return Task.FromResult(channels);
+    }
+
+    /// <inheritdoc/>
+    public async Task<PaymentResponse> RequestPayment(PaymentRequest request)
+    {
+        var paymentId = Guid.NewGuid().ToString("N");
+        var (resultId, redirectUrl) = await caller.InitPaymentAsync(request, paymentId);
+
+        if (resultId is null && redirectUrl is null)
+            return new PaymentResponse { PaymentStatus = PaymentStatusEnum.Rejected, ResponseObject = "API error" };
+
+        return new PaymentResponse
+        {
+            PaymentUniqueId = resultId,
+            RedirectUrl = redirectUrl,
+            PaymentStatus = PaymentStatusEnum.Created,
+        };
+    }
+
+    /// <inheritdoc/>
+    public Task<PaymentResponse> GetStatus(string paymentId)
+        => Task.FromResult(new PaymentResponse { PaymentUniqueId = paymentId, PaymentStatus = PaymentStatusEnum.Processing });
+
+    // ─── IWebhookPaymentProvider ─────────────────────────────────────────────
+
+    /// <inheritdoc/>
+    public async Task<PaymentWebhookResult> HandleWebhookAsync(PaymentWebhookRequest request)
+    {
+        var hash = request.Query.TryGetValue("HASH", out var h) ? h.ToString() : string.Empty;
+        var kwota = request.Query.TryGetValue("KWOTA", out var k) ? k.ToString() : string.Empty;
+        var idPlatnosci = request.Query.TryGetValue("ID_PLATNOSCI", out var i) ? i.ToString() : string.Empty;
+        var status = request.Query.TryGetValue("STATUS", out var s) ? s.ToString() : string.Empty;
+
+        var payload = new TransactionStatusChangePayload
+        {
+            QueryParameters = new Dictionary<string, Microsoft.Extensions.Primitives.StringValues>
+            {
+                { "HASH",         hash        },
+                { "KWOTA",        kwota       },
+                { "ID_PLATNOSCI", idPlatnosci },
+                { "STATUS",       status      },
+            },
+        };
+
+        var response = await TransactionStatusChange(payload);
+
+        if (response.PaymentStatus == PaymentStatusEnum.Rejected)
+        {
+            var msg = response.ResponseObject?.ToString() ?? string.Empty;
+            if (msg.Contains("signature", StringComparison.OrdinalIgnoreCase) ||
+                msg.Contains("hash", StringComparison.OrdinalIgnoreCase) ||
+                msg.Contains("sign", StringComparison.OrdinalIgnoreCase) ||
+                msg.Contains("hmac", StringComparison.OrdinalIgnoreCase))
+                return PaymentWebhookResult.Fail(msg);
+        }
+
+        if (response.PaymentStatus == PaymentStatusEnum.Processing && string.IsNullOrEmpty(response.PaymentUniqueId))
+            return PaymentWebhookResult.Ignore("Non-actionable event");
+
+        return PaymentWebhookResult.Ok(response);
+    }
+
+    /// <inheritdoc/>
+    public Task<PaymentResponse> TransactionStatusChange(TransactionStatusChangePayload payload)
+    {
+        var qs = payload.QueryParameters;
+        var hash = qs.TryGetValue("HASH", out var h) ? h.ToString() : string.Empty;
+        var kwota = qs.TryGetValue("KWOTA", out var k) ? k.ToString() : string.Empty;
+        var idPlatnosci = qs.TryGetValue("ID_PLATNOSCI", out var i) ? i.ToString() : string.Empty;
+        var status = qs.TryGetValue("STATUS", out var s) ? s.ToString() : string.Empty;
+
+        if (!caller.VerifyNotification(hash, kwota, idPlatnosci, status))
+            return Task.FromResult(new PaymentResponse { PaymentStatus = PaymentStatusEnum.Rejected, ResponseObject = "Invalid hash" });
+
+        var payStatus = status == "SUCCESS" ? PaymentStatusEnum.Finished : PaymentStatusEnum.Rejected;
+        return Task.FromResult(new PaymentResponse { PaymentUniqueId = idPlatnosci, PaymentStatus = payStatus, ResponseObject = "OK" });
+    }
+}
+
+/// <summary>Rozszerzenia DI dla HotPay.</summary>
+public static class HotPayProviderExtensions
+{
+    /// <summary>Rejestruje provider i jego zależności w kontenerze DI.</summary>
+    public static void RegisterHotPayProvider(this IServiceCollection services)
+    {
+        services.AddOptions<HotPayServiceOptions>();
+        services.ConfigureOptions<HotPayConfigureOptions>();
+        services.AddHttpClient("HotPay");
+        services.AddTransient<IHotPayServiceCaller, HotPayServiceCaller>();
+        services.AddTransient<HotPayProvider>();
+        services.AddTransient<IWebhookPaymentProvider>(sp => sp.GetRequiredService<HotPayProvider>());
+    }
+}
+
+/// <summary>Wczytuje opcje HotPay z konfiguracji.</summary>
+public class HotPayConfigureOptions : IConfigureOptions<HotPayServiceOptions>
+{
+    private readonly IConfiguration configuration;
+    /// <summary>Inicjalizuje instancję konfiguracji.</summary>
+    public HotPayConfigureOptions(IConfiguration configuration) => this.configuration = configuration;
+    /// <inheritdoc/>
+    public void Configure(HotPayServiceOptions options)
+    {
+        var s = configuration.GetSection(HotPayServiceOptions.ConfigurationKey).Get<HotPayServiceOptions>();
+        if (s is null) return;
+        options.SecretHash = s.SecretHash;
+        options.ServiceUrl = s.ServiceUrl;
+        options.ReturnUrl = s.ReturnUrl;
+        options.NotifyUrl = s.NotifyUrl;
+    }
+}
diff --git a/src/TailoredApps.Shared.Payments.Provider.PayNow/PayNowProvider.cs b/src/TailoredApps.Shared.Payments.Provider.PayNow/PayNowProvider.cs
index 7373e3c..5f70c0e 100644
--- a/src/TailoredApps.Shared.Payments.Provider.PayNow/PayNowProvider.cs
+++ b/src/TailoredApps.Shared.Payments.Provider.PayNow/PayNowProvider.cs
@@ -1,294 +1,297 @@
-using System.Net.Http;
-using System.Net.Http.Headers;
-using System.Security.Cryptography;
-using System.Text;
-using System.Text.Json;
-using System.Text.Json.Serialization;
-using Microsoft.Extensions.Configuration;
-using Microsoft.Extensions.DependencyInjection;
-using Microsoft.Extensions.Options;
-
-namespace TailoredApps.Shared.Payments.Provider.PayNow;
-
-/// <summary>Konfiguracja PayNow. Sekcja: <c>Payments:Providers:PayNow</c>.</summary>
-public class PayNowServiceOptions
-{
-    /// <summary>Klucz sekcji konfiguracji.</summary>
-    public static string ConfigurationKey => "Payments:Providers:PayNow";
-    /// <summary>ApiKey.</summary>
-    public string ApiKey       { get; set; } = string.Empty;
-    /// <summary>SignatureKey.</summary>
-    public string SignatureKey { get; set; } = string.Empty;
-    /// <summary>Base URL of the PayNow API endpoint.</summary>
-    public string ServiceUrl   { get; set; } = "https://api.paynow.pl";
-
-    /// <summary>Alias for ServiceUrl — backwards compatibility.</summary>
-    [Obsolete("Use ServiceUrl instead.")]
-    public string ApiUrl { get => ServiceUrl; set => ServiceUrl = value; }
-    /// <summary>ReturnUrl.</summary>
-    public string ReturnUrl    { get; set; } = string.Empty;
-    /// <summary>ContinueUrl.</summary>
-    public string ContinueUrl  { get; set; } = string.Empty;
-}
-
-file class PayNowPaymentRequest
-{
-    [JsonPropertyName("amount")]      public long   Amount      { get; set; }
-    [JsonPropertyName("currency")]    public string Currency    { get; set; } = "PLN";
-    [JsonPropertyName("externalId")]  public string ExternalId  { get; set; } = string.Empty;
-    [JsonPropertyName("description")] public string Description { get; set; } = string.Empty;
-    [JsonPropertyName("buyer")]       public PayNowBuyer? Buyer { get; set; }
-    [JsonPropertyName("continueUrl")] public string? ContinueUrl { get; set; }
-    [JsonPropertyName("returnUrl")]   public string? ReturnUrl   { get; set; }
-}
-
-file class PayNowBuyer
-{
-    [JsonPropertyName("email")] public string Email { get; set; } = string.Empty;
-}
-
-file class PayNowPaymentResponse
-{
-    [JsonPropertyName("paymentId")]   public string? PaymentId   { get; set; }
-    [JsonPropertyName("status")]      public string? Status      { get; set; }
-    [JsonPropertyName("redirectUrl")] public string? RedirectUrl { get; set; }
-}
-
-file class PayNowStatusResponse
-{
-    [JsonPropertyName("status")] public string? Status { get; set; }
-}
-
-/// <summary>Abstrakcja nad PayNow REST API v2.</summary>
-public interface IPayNowServiceCaller
-{
-    /// <summary>Wywołanie API.</summary>
-    Task<(string? paymentId, string? redirectUrl)> CreatePaymentAsync(PaymentRequest request);
-    /// <summary>Wywołanie API.</summary>
-    Task<PaymentStatusEnum> GetPaymentStatusAsync(string paymentId);
-    /// <summary>Weryfikuje podpis powiadomienia.</summary>
-    bool VerifySignature(string body, string signature);
-}
-
-/// <summary>Implementacja <see cref="IPayNowServiceCaller"/>.</summary>
-public class PayNowServiceCaller : IPayNowServiceCaller
-{
-    private readonly PayNowServiceOptions options;
-    private readonly IHttpClientFactory httpClientFactory;
-
-    /// <summary>Inicjalizuje instancję callera.</summary>
-    public PayNowServiceCaller(IOptions<PayNowServiceOptions> options, IHttpClientFactory httpClientFactory)
-    {
-        this.options = options.Value;
-        this.httpClientFactory = httpClientFactory;
-    }
-
-    private HttpClient CreateClient()
-    {
-        var client = httpClientFactory.CreateClient("PayNow");
-        client.DefaultRequestHeaders.Add("Api-Key", options.ApiKey);
-        client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
-        return client;
-    }
-
-    /// <inheritdoc/>
-    public async Task<(string? paymentId, string? redirectUrl)> CreatePaymentAsync(PaymentRequest request)
-    {
-        using var client = CreateClient();
-        client.DefaultRequestHeaders.Add("Idempotency-Key", Guid.NewGuid().ToString());
-
-        var body = new PayNowPaymentRequest
-        {
-            Amount      = (long)(request.Amount * 100),
-            Currency    = request.Currency.ToUpperInvariant(),
-            ExternalId  = request.AdditionalData ?? Guid.NewGuid().ToString("N"),
-            Description = request.Title ?? request.Description ?? "Order",
-            Buyer       = new PayNowBuyer { Email = request.Email ?? string.Empty },
-            ContinueUrl = options.ContinueUrl,
-            ReturnUrl   = options.ReturnUrl,
-        };
-
-        var content  = new StringContent(JsonSerializer.Serialize(body), Encoding.UTF8, "application/json");
-        var response = await client.PostAsync($"{options.ServiceUrl}/v2/payments", content);
-        var json     = await response.Content.ReadAsStringAsync();
-        var result   = JsonSerializer.Deserialize<PayNowPaymentResponse>(json);
-        return (result?.PaymentId, result?.RedirectUrl);
-    }
-
-    /// <inheritdoc/>
-    public async Task<PaymentStatusEnum> GetPaymentStatusAsync(string paymentId)
-    {
-        using var client = CreateClient();
-        var response = await client.GetAsync($"{options.ServiceUrl}/v2/payments/{paymentId}/status");
-        if (!response.IsSuccessStatusCode) return PaymentStatusEnum.Rejected;
-        var json   = await response.Content.ReadAsStringAsync();
-        var status = JsonSerializer.Deserialize<PayNowStatusResponse>(json)?.Status;
-        return status switch
-        {
-            "CONFIRMED"  => PaymentStatusEnum.Finished,
-            "PENDING"    => PaymentStatusEnum.Processing,
-            "PROCESSING" => PaymentStatusEnum.Processing,
-            "NEW"        => PaymentStatusEnum.Created,
-            "ERROR"      => PaymentStatusEnum.Rejected,
-            "REJECTED"   => PaymentStatusEnum.Rejected,
-            "ABANDONED"  => PaymentStatusEnum.Rejected,
-            _            => PaymentStatusEnum.Created,
-        };
-    }
-
-    /// <inheritdoc/>
-    public bool VerifySignature(string body, string signature)
-    {
-        var keyBytes  = Encoding.UTF8.GetBytes(options.SignatureKey);
-        var dataBytes = Encoding.UTF8.GetBytes(body);
-        var computed  = Convert.ToBase64String(HMACSHA256.HashData(keyBytes, dataBytes));
-        return string.Equals(computed, signature, StringComparison.Ordinal);
-    }
-}
-
-/// <summary>Implementacja <see cref="IPaymentProvider"/> dla PayNow (mBank).</summary>
-public class PayNowProvider : IPaymentProvider, IWebhookPaymentProvider
-{
-    private readonly IPayNowServiceCaller caller;
-
-    /// <summary>Inicjalizuje instancję providera.</summary>
-    public PayNowProvider(IPayNowServiceCaller caller) => this.caller = caller;
-
-    public string Key         => "PayNow";
-    public string Name        => "PayNow";
-    /// <inheritdoc/>
-    public string Description => "Operator płatności PayNow (mBank) — BLIK, karty, przelewy.";
-    public string Url         => "https://paynow.pl";
-
-    /// <inheritdoc/>
-    public Task<ICollection<PaymentChannel>> GetPaymentChannels(string currency)
-    {
-        ICollection<PaymentChannel> channels =
-        [
-            new PaymentChannel { Id = "BLIK",     Name = "BLIK",               Description = "BLIK",             PaymentModel = PaymentModel.OneTime },
-            new PaymentChannel { Id = "CARD",     Name = "Karta płatnicza",    Description = "Visa, Mastercard", PaymentModel = PaymentModel.OneTime },
-            new PaymentChannel { Id = "PBL",      Name = "Przelew bankowy",    Description = "Pay-by-link",      PaymentModel = PaymentModel.OneTime },
-            new PaymentChannel { Id = "TRANSFER", Name = "Przelew tradycyjny", Description = "Przelew bankowy",  PaymentModel = PaymentModel.OneTime },
-        ];
-        return Task.FromResult(channels);
-    }
-
-    /// <inheritdoc/>
-    public async Task<PaymentResponse> RequestPayment(PaymentRequest request)
-    {
-        var (paymentId, redirectUrl) = await caller.CreatePaymentAsync(request);
-        if (paymentId is null)
-            return new PaymentResponse { PaymentStatus = PaymentStatusEnum.Rejected, ResponseObject = "API error" };
-        return new PaymentResponse
-        {
-            PaymentUniqueId = paymentId,
-            RedirectUrl     = redirectUrl,
-            PaymentStatus   = PaymentStatusEnum.Created,
-        };
-    }
-
-    /// <inheritdoc/>
-    public async Task<PaymentResponse> GetStatus(string paymentId)
-    {
-        var status = await caller.GetPaymentStatusAsync(paymentId);
-        return new PaymentResponse { PaymentUniqueId = paymentId, PaymentStatus = status };
-    }
-
-    // ─── IWebhookPaymentProvider ─────────────────────────────────────────────
-
-    /// <inheritdoc/>
-    public async Task<PaymentWebhookResult> HandleWebhookAsync(PaymentWebhookRequest request)
-    {
-        var body      = request.Body ?? string.Empty;
-        var signature = request.Headers.TryGetValue("Signature", out var s) ? s.ToString() : string.Empty;
-
-        var payload = new TransactionStatusChangePayload
-        {
-            Payload         = body,
-            QueryParameters = new Dictionary<string, Microsoft.Extensions.Primitives.StringValues>
-            {
-                { "Signature", signature },
-            },
-        };
-
-        var response = await TransactionStatusChange(payload);
-
-        if (response.PaymentStatus == PaymentStatusEnum.Rejected)
-        {
-            var msg = response.ResponseObject?.ToString() ?? string.Empty;
-            if (msg.Contains("signature", StringComparison.OrdinalIgnoreCase) ||
-                msg.Contains("hash",      StringComparison.OrdinalIgnoreCase) ||
-                msg.Contains("sign",      StringComparison.OrdinalIgnoreCase) ||
-                msg.Contains("hmac",      StringComparison.OrdinalIgnoreCase))
-                return PaymentWebhookResult.Fail(msg);
-        }
-
-        if (response.PaymentStatus == PaymentStatusEnum.Processing && string.IsNullOrEmpty(response.PaymentUniqueId))
-            return PaymentWebhookResult.Ignore("Non-actionable event");
-
-        return PaymentWebhookResult.Ok(response);
-    }
-
-    /// <inheritdoc/>
-    public Task<PaymentResponse> TransactionStatusChange(TransactionStatusChangePayload payload)
-    {
-        var body = payload.Payload?.ToString() ?? string.Empty;
-        var sig  = payload.QueryParameters.TryGetValue("Signature", out var s) ? s.ToString() : string.Empty;
-
-        if (!caller.VerifySignature(body, sig))
-            return Task.FromResult(new PaymentResponse { PaymentStatus = PaymentStatusEnum.Rejected, ResponseObject = "Invalid signature" });
-
-        var status = PaymentStatusEnum.Processing;
-        try
-        {
-            var doc = JsonDocument.Parse(body);
-            if (doc.RootElement.TryGetProperty("status", out var st))
-                status = st.GetString() switch
-                {
-                    "CONFIRMED"  => PaymentStatusEnum.Finished,
-                    "ERROR"      => PaymentStatusEnum.Rejected,
-                    "REJECTED"   => PaymentStatusEnum.Rejected,
-                    "ABANDONED"  => PaymentStatusEnum.Rejected,
-                    _            => PaymentStatusEnum.Processing,
-                };
-        }
-        catch { /* ignore */ }
-
-        return Task.FromResult(new PaymentResponse { PaymentStatus = status, ResponseObject = "OK" });
-    }
-}
-
-/// <summary>Rozszerzenia DI dla PayNow.</summary>
-public static class PayNowProviderExtensions
-{
-    /// <summary>Rejestruje provider i jego zależności w kontenerze DI.</summary>
-    public static void RegisterPayNowProvider(this IServiceCollection services)
-    {
-        services.AddOptions<PayNowServiceOptions>();
-        services.ConfigureOptions<PayNowConfigureOptions>();
-        services.AddHttpClient("PayNow");
-        services.AddTransient<IPayNowServiceCaller, PayNowServiceCaller>();
-        services.AddTransient<PayNowProvider>();
-        services.AddTransient<IPaymentProvider>(sp => sp.GetRequiredService<PayNowProvider>());
-        services.AddTransient<IWebhookPaymentProvider>(sp => sp.GetRequiredService<PayNowProvider>());
-    }
-}
-
-/// <summary>Wczytuje opcje PayNow z konfiguracji.</summary>
-public class PayNowConfigureOptions : IConfigureOptions<PayNowServiceOptions>
-{
-    private readonly IConfiguration configuration;
-    /// <summary>Inicjalizuje instancję konfiguracji.</summary>
-    public PayNowConfigureOptions(IConfiguration configuration) => this.configuration = configuration;
-    /// <inheritdoc/>
-    public void Configure(PayNowServiceOptions options)
-    {
-        var s = configuration.GetSection(PayNowServiceOptions.ConfigurationKey).Get<PayNowServiceOptions>();
-        if (s is null) return;
-        options.ApiKey       = s.ApiKey;
-        options.SignatureKey = s.SignatureKey;
-        options.ServiceUrl       = s.ServiceUrl;
-        options.ReturnUrl    = s.ReturnUrl;
-        options.ContinueUrl  = s.ContinueUrl;
-    }
-}
+using System.Net.Http;
+using System.Net.Http.Headers;
+using System.Security.Cryptography;
+using System.Text;
+using System.Text.Json;
+using System.Text.Json.Serialization;
+using Microsoft.Extensions.Configuration;
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Options;
+
+namespace TailoredApps.Shared.Payments.Provider.PayNow;
+
+/// <summary>Konfiguracja PayNow. Sekcja: <c>Payments:Providers:PayNow</c>.</summary>
+public class PayNowServiceOptions
+{
+    /// <summary>Klucz sekcji konfiguracji.</summary>
+    public static string ConfigurationKey => "Payments:Providers:PayNow";
+    /// <summary>ApiKey.</summary>
+    public string ApiKey { get; set; } = string.Empty;
+    /// <summary>SignatureKey.</summary>
+    public string SignatureKey { get; set; } = string.Empty;
+    /// <summary>Base URL of the PayNow API endpoint.</summary>
+    public string ServiceUrl { get; set; } = "https://api.paynow.pl";
+
+    /// <summary>Alias for ServiceUrl — backwards compatibility.</summary>
+    [Obsolete("Use ServiceUrl instead.")]
+    public string ApiUrl { get => ServiceUrl; set => ServiceUrl = value; }
+    /// <summary>ReturnUrl.</summary>
+    public string ReturnUrl { get; set; } = string.Empty;
+    /// <summary>ContinueUrl.</summary>
+    public string ContinueUrl { get; set; } = string.Empty;
+}
+
+file class PayNowPaymentRequest
+{
+    [JsonPropertyName("amount")] public long Amount { get; set; }
+    [JsonPropertyName("currency")] public string Currency { get; set; } = "PLN";
+    [JsonPropertyName("externalId")] public string ExternalId { get; set; } = string.Empty;
+    /// <inheritdoc/>
+    [JsonPropertyName("description")] public string Description { get; set; } = string.Empty;
+    [JsonPropertyName("buyer")] public PayNowBuyer? Buyer { get; set; }
+    [JsonPropertyName("continueUrl")] public string? ContinueUrl { get; set; }
+    [JsonPropertyName("returnUrl")] public string? ReturnUrl { get; set; }
+}
+
+file class PayNowBuyer
+{
+    [JsonPropertyName("email")] public string Email { get; set; } = string.Empty;
+}
+
+file class PayNowPaymentResponse
+{
+    [JsonPropertyName("paymentId")] public string? PaymentId { get; set; }
+    [JsonPropertyName("status")] public string? Status { get; set; }
+    [JsonPropertyName("redirectUrl")] public string? RedirectUrl { get; set; }
+}
+
+file class PayNowStatusResponse
+{
+    [JsonPropertyName("status")] public string? Status { get; set; }
+}
+
+/// <summary>Abstrakcja nad PayNow REST API v2.</summary>
+public interface IPayNowServiceCaller
+{
+    /// <summary>Wywołanie API.</summary>
+    Task<(string? paymentId, string? redirectUrl)> CreatePaymentAsync(PaymentRequest request);
+    /// <summary>Wywołanie API.</summary>
+    Task<PaymentStatusEnum> GetPaymentStatusAsync(string paymentId);
+    /// <summary>Weryfikuje podpis powiadomienia.</summary>
+    bool VerifySignature(string body, string signature);
+}
+
+/// <summary>Implementacja <see cref="IPayNowServiceCaller"/>.</summary>
+public class PayNowServiceCaller : IPayNowServiceCaller
+{
+    private readonly PayNowServiceOptions options;
+    private readonly IHttpClientFactory httpClientFactory;
+
+    /// <summary>Inicjalizuje instancję callera.</summary>
+    public PayNowServiceCaller(IOptions<PayNowServiceOptions> options, IHttpClientFactory httpClientFactory)
+    {
+        this.options = options.Value;
+        this.httpClientFactory = httpClientFactory;
+    }
+
+    private HttpClient CreateClient()
+    {
+        var client = httpClientFactory.CreateClient("PayNow");
+        client.DefaultRequestHeaders.Add("Api-Key", options.ApiKey);
+        client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
+        return client;
+    }
+
+    /// <inheritdoc/>
+    public async Task<(string? paymentId, string? redirectUrl)> CreatePaymentAsync(PaymentRequest request)
+    {
+        using var client = CreateClient();
+        client.DefaultRequestHeaders.Add("Idempotency-Key", Guid.NewGuid().ToString());
+
+        var body = new PayNowPaymentRequest
+        {
+            Amount = (long)(request.Amount * 100),
+            Currency = request.Currency.ToUpperInvariant(),
+            ExternalId = request.AdditionalData ?? Guid.NewGuid().ToString("N"),
+            Description = request.Title ?? request.Description ?? "Order",
+            Buyer = new PayNowBuyer { Email = request.Email ?? string.Empty },
+            ContinueUrl = options.ContinueUrl,
+            ReturnUrl = options.ReturnUrl,
+        };
+
+        var content = new StringContent(JsonSerializer.Serialize(body), Encoding.UTF8, "application/json");
+        var response = await client.PostAsync($"{options.ServiceUrl}/v2/payments", content);
+        var json = await response.Content.ReadAsStringAsync();
+        var result = JsonSerializer.Deserialize<PayNowPaymentResponse>(json);
+        return (result?.PaymentId, result?.RedirectUrl);
+    }
+
+    /// <inheritdoc/>
+    public async Task<PaymentStatusEnum> GetPaymentStatusAsync(string paymentId)
+    {
+        using var client = CreateClient();
+        var response = await client.GetAsync($"{options.ServiceUrl}/v2/payments/{paymentId}/status");
+        if (!response.IsSuccessStatusCode) return PaymentStatusEnum.Rejected;
+        var json = await response.Content.ReadAsStringAsync();
+        var status = JsonSerializer.Deserialize<PayNowStatusResponse>(json)?.Status;
+        return status switch
+        {
+            "CONFIRMED" => PaymentStatusEnum.Finished,
+            "PENDING" => PaymentStatusEnum.Processing,
+            "PROCESSING" => PaymentStatusEnum.Processing,
+            "NEW" => PaymentStatusEnum.Created,
+            "ERROR" => PaymentStatusEnum.Rejected,
+            "REJECTED" => PaymentStatusEnum.Rejected,
+            "ABANDONED" => PaymentStatusEnum.Rejected,
+            _ => PaymentStatusEnum.Created,
+        };
+    }
+
+    /// <inheritdoc/>
+    public bool VerifySignature(string body, string signature)
+    {
+        var keyBytes = Encoding.UTF8.GetBytes(options.SignatureKey);
+        var dataBytes = Encoding.UTF8.GetBytes(body);
+        var computed = Convert.ToBase64String(HMACSHA256.HashData(keyBytes, dataBytes));
+        return string.Equals(computed, signature, StringComparison.Ordinal);
+    }
+}
+
+/// <summary>Implementacja <see cref="IPaymentProvider"/> dla PayNow (mBank).</summary>
+public class PayNowProvider : IPaymentProvider, IWebhookPaymentProvider
+{
+    private readonly IPayNowServiceCaller caller;
+
+    /// <summary>Inicjalizuje instancję providera.</summary>
+    public PayNowProvider(IPayNowServiceCaller caller) => this.caller = caller;
+
+    /// <inheritdoc/>
+    public string Key => "PayNow";
+    /// <inheritdoc/>
+    public string Name => "PayNow";
+    /// <inheritdoc/>
+    public string Description => "Operator płatności PayNow (mBank) — BLIK, karty, przelewy.";
+    /// <inheritdoc/>
+    public string Url => "https://paynow.pl";
+
+    /// <inheritdoc/>
+    public Task<ICollection<PaymentChannel>> GetPaymentChannels(string currency)
+    {
+        ICollection<PaymentChannel> channels =
+        [
+            new PaymentChannel { Id = "BLIK",     Name = "BLIK",               Description = "BLIK",             PaymentModel = PaymentModel.OneTime },
+            new PaymentChannel { Id = "CARD",     Name = "Karta płatnicza",    Description = "Visa, Mastercard", PaymentModel = PaymentModel.OneTime },
+            new PaymentChannel { Id = "PBL",      Name = "Przelew bankowy",    Description = "Pay-by-link",      PaymentModel = PaymentModel.OneTime },
+            new PaymentChannel { Id = "TRANSFER", Name = "Przelew tradycyjny", Description = "Przelew bankowy",  PaymentModel = PaymentModel.OneTime },
+        ];
+        return Task.FromResult(channels);
+    }
+
+    /// <inheritdoc/>
+    public async Task<PaymentResponse> RequestPayment(PaymentRequest request)
+    {
+        var (paymentId, redirectUrl) = await caller.CreatePaymentAsync(request);
+        if (paymentId is null)
+            return new PaymentResponse { PaymentStatus = PaymentStatusEnum.Rejected, ResponseObject = "API error" };
+        return new PaymentResponse
+        {
+            PaymentUniqueId = paymentId,
+            RedirectUrl = redirectUrl,
+            PaymentStatus = PaymentStatusEnum.Created,
+        };
+    }
+
+    /// <inheritdoc/>
+    public async Task<PaymentResponse> GetStatus(string paymentId)
+    {
+        var status = await caller.GetPaymentStatusAsync(paymentId);
+        return new PaymentResponse { PaymentUniqueId = paymentId, PaymentStatus = status };
+    }
+
+    // ─── IWebhookPaymentProvider ─────────────────────────────────────────────
+
+    /// <inheritdoc/>
+    public async Task<PaymentWebhookResult> HandleWebhookAsync(PaymentWebhookRequest request)
+    {
+        var body = request.Body ?? string.Empty;
+        var signature = request.Headers.TryGetValue("Signature", out var s) ? s.ToString() : string.Empty;
+
+        var payload = new TransactionStatusChangePayload
+        {
+            Payload = body,
+            QueryParameters = new Dictionary<string, Microsoft.Extensions.Primitives.StringValues>
+            {
+                { "Signature", signature },
+            },
+        };
+
+        var response = await TransactionStatusChange(payload);
+
+        if (response.PaymentStatus == PaymentStatusEnum.Rejected)
+        {
+            var msg = response.ResponseObject?.ToString() ?? string.Empty;
+            if (msg.Contains("signature", StringComparison.OrdinalIgnoreCase) ||
+                msg.Contains("hash", StringComparison.OrdinalIgnoreCase) ||
+                msg.Contains("sign", StringComparison.OrdinalIgnoreCase) ||
+                msg.Contains("hmac", StringComparison.OrdinalIgnoreCase))
+                return PaymentWebhookResult.Fail(msg);
+        }
+
+        if (response.PaymentStatus == PaymentStatusEnum.Processing && string.IsNullOrEmpty(response.PaymentUniqueId))
+            return PaymentWebhookResult.Ignore("Non-actionable event");
+
+        return PaymentWebhookResult.Ok(response);
+    }
+
+    /// <inheritdoc/>
+    public Task<PaymentResponse> TransactionStatusChange(TransactionStatusChangePayload payload)
+    {
+        var body = payload.Payload?.ToString() ?? string.Empty;
+        var sig = payload.QueryParameters.TryGetValue("Signature", out var s) ? s.ToString() : string.Empty;
+
+        if (!caller.VerifySignature(body, sig))
+            return Task.FromResult(new PaymentResponse { PaymentStatus = PaymentStatusEnum.Rejected, ResponseObject = "Invalid signature" });
+
+        var status = PaymentStatusEnum.Processing;
+        try
+        {
+            var doc = JsonDocument.Parse(body);
+            if (doc.RootElement.TryGetProperty("status", out var st))
+                status = st.GetString() switch
+                {
+                    "CONFIRMED" => PaymentStatusEnum.Finished,
+                    "ERROR" => PaymentStatusEnum.Rejected,
+                    "REJECTED" => PaymentStatusEnum.Rejected,
+                    "ABANDONED" => PaymentStatusEnum.Rejected,
+                    _ => PaymentStatusEnum.Processing,
+                };
+        }
+        catch { /* ignore */ }
+
+        return Task.FromResult(new PaymentResponse { PaymentStatus = status, ResponseObject = "OK" });
+    }
+}
+
+/// <summary>Rozszerzenia DI dla PayNow.</summary>
+public static class PayNowProviderExtensions
+{
+    /// <summary>Rejestruje provider i jego zależności w kontenerze DI.</summary>
+    public static void RegisterPayNowProvider(this IServiceCollection services)
+    {
+        services.AddOptions<PayNowServiceOptions>();
+        services.ConfigureOptions<PayNowConfigureOptions>();
+        services.AddHttpClient("PayNow");
+        services.AddTransient<IPayNowServiceCaller, PayNowServiceCaller>();
+        services.AddTransient<PayNowProvider>();
+        services.AddTransient<IWebhookPaymentProvider>(sp => sp.GetRequiredService<PayNowProvider>());
+    }
+}
+
+/// <summary>Wczytuje opcje PayNow z konfiguracji.</summary>
+public class PayNowConfigureOptions : IConfigureOptions<PayNowServiceOptions>
+{
+    private readonly IConfiguration configuration;
+    /// <summary>Inicjalizuje instancję konfiguracji.</summary>
+    public PayNowConfigureOptions(IConfiguration configuration) => this.configuration = configuration;
+    /// <inheritdoc/>
+    public void Configure(PayNowServiceOptions options)
+    {
+        var s = configuration.GetSection(PayNowServiceOptions.ConfigurationKey).Get<PayNowServiceOptions>();
+        if (s is null) return;
+        options.ApiKey = s.ApiKey;
+        options.SignatureKey = s.SignatureKey;
+        options.ServiceUrl = s.ServiceUrl;
+        options.ReturnUrl = s.ReturnUrl;
+        options.ContinueUrl = s.ContinueUrl;
+    }
+}
diff --git a/src/TailoredApps.Shared.Payments.Provider.PayU/PayUProvider.cs b/src/TailoredApps.Shared.Payments.Provider.PayU/PayUProvider.cs
index a92281d..497409b 100644
--- a/src/TailoredApps.Shared.Payments.Provider.PayU/PayUProvider.cs
+++ b/src/TailoredApps.Shared.Payments.Provider.PayU/PayUProvider.cs
@@ -1,405 +1,405 @@
-using System.Net.Http;
-using System.Net.Http.Headers;
-using System.Security.Cryptography;
-using System.Text;
-using System.Text.Json;
-using System.Text.Json.Serialization;
-using Microsoft.Extensions.Configuration;
-using Microsoft.Extensions.DependencyInjection;
-using Microsoft.Extensions.Options;
-
-namespace TailoredApps.Shared.Payments.Provider.PayU;
-
-// ─── Options ─────────────────────────────────────────────────────────────────
-
-/// <summary>Konfiguracja PayU REST API v2.1. Sekcja: <c>Payments:Providers:PayU</c>.</summary>
-public class PayUServiceOptions
-{
-    /// <summary>Klucz sekcji konfiguracji.</summary>
-    public static string ConfigurationKey => "Payments:Providers:PayU";
-
-    /// <summary>Identyfikator klienta OAuth (client_id).</summary>
-    public string ClientId { get; set; } = string.Empty;
-
-    /// <summary>Sekret klienta OAuth (client_secret).</summary>
-    public string ClientSecret { get; set; } = string.Empty;
-
-    /// <summary>Identyfikator POS (merchantPosId).</summary>
-    public string PosId { get; set; } = string.Empty;
-
-    /// <summary>Klucz do podpisu powiadomień (second key / signature key).</summary>
-    public string SignatureKey { get; set; } = string.Empty;
-
-    /// <summary>Bazowy URL API PayU (sandbox: https://secure.snd.payu.com).</summary>
-    public string ServiceUrl { get; set; } = "https://secure.snd.payu.com";
-
-    /// <summary>URL powiadomień o statusie transakcji.</summary>
-    public string NotifyUrl { get; set; } = string.Empty;
-
-    /// <summary>URL powrotu po płatności.</summary>
-    public string ContinueUrl { get; set; } = string.Empty;
-}
-
-// ─── Internal models ─────────────────────────────────────────────────────────
-
-file class PayUTokenResponse
-{
-    [JsonPropertyName("access_token")] public string AccessToken { get; set; } = string.Empty;
-    [JsonPropertyName("token_type")]   public string TokenType   { get; set; } = string.Empty;
-    [JsonPropertyName("expires_in")]   public int    ExpiresIn   { get; set; }
-}
-
-file class PayUOrderRequest
-{
-    [JsonPropertyName("notifyUrl")]    public string  NotifyUrl    { get; set; } = string.Empty;
-    [JsonPropertyName("continueUrl")]  public string  ContinueUrl  { get; set; } = string.Empty;
-    [JsonPropertyName("customerIp")]   public string  CustomerIp   { get; set; } = "127.0.0.1";
-    [JsonPropertyName("merchantPosId")]public string  MerchantPosId { get; set; } = string.Empty;
-    [JsonPropertyName("description")]  public string  Description  { get; set; } = string.Empty;
-    [JsonPropertyName("currencyCode")] public string  CurrencyCode { get; set; } = string.Empty;
-    [JsonPropertyName("totalAmount")]  public string  TotalAmount  { get; set; } = string.Empty;
-    [JsonPropertyName("buyer")]        public PayUBuyer? Buyer     { get; set; }
-    [JsonPropertyName("products")]     public List<PayUProduct> Products { get; set; } = [];
-}
-
-file class PayUBuyer
-{
-    [JsonPropertyName("email")]     public string Email     { get; set; } = string.Empty;
-    [JsonPropertyName("firstName")] public string FirstName { get; set; } = string.Empty;
-    [JsonPropertyName("lastName")]  public string LastName  { get; set; } = string.Empty;
-}
-
-file class PayUProduct
-{
-    [JsonPropertyName("name")]      public string Name      { get; set; } = string.Empty;
-    [JsonPropertyName("unitPrice")] public string UnitPrice { get; set; } = string.Empty;
-    [JsonPropertyName("quantity")]  public string Quantity   { get; set; } = "1";
-}
-
-file class PayUOrderResponse
-{
-    [JsonPropertyName("status")]    public PayUStatus? Status   { get; set; }
-    [JsonPropertyName("orderId")]   public string?     OrderId  { get; set; }
-    [JsonPropertyName("redirectUri")] public string?   RedirectUri { get; set; }
-}
-
-file class PayUStatus
-{
-    [JsonPropertyName("statusCode")] public string? StatusCode { get; set; }
-}
-
-file class PayUStatusResponse
-{
-    [JsonPropertyName("orders")] public List<PayUOrderDetail>? Orders { get; set; }
-}
-
-file class PayUOrderDetail
-{
-    [JsonPropertyName("orderId")] public string? OrderId { get; set; }
-    [JsonPropertyName("status")]  public string? Status  { get; set; }
-}
-
-// ─── Interface ────────────────────────────────────────────────────────────────
-
-/// <summary>Abstrakcja nad PayU REST API v2.1.</summary>
-public interface IPayUServiceCaller
-{
-    /// <summary>Pobiera token OAuth (grant_type=client_credentials).</summary>
-    Task<string> GetAccessTokenAsync();
-
-    /// <summary>Tworzy zamówienie w PayU i zwraca orderId + redirectUri.</summary>
-    Task<(string? orderId, string? redirectUri, string? error)> CreateOrderAsync(string token, PaymentRequest request);
-
-    /// <summary>Pobiera status zamówienia po orderId.</summary>
-    Task<PaymentStatusEnum> GetOrderStatusAsync(string token, string orderId);
-
-    /// <summary>Weryfikuje podpis powiadomienia (OpenPayU-Signature header).</summary>
-    bool VerifySignature(string body, string incomingSignature);
-}
-
-// ─── Caller ───────────────────────────────────────────────────────────────────
-
-/// <summary>Implementacja <see cref="IPayUServiceCaller"/>.</summary>
-public class PayUServiceCaller : IPayUServiceCaller
-{
-    private readonly PayUServiceOptions options;
-    private readonly IHttpClientFactory httpClientFactory;
-
-    /// <summary>Inicjalizuje instancję <see cref="PayUServiceCaller"/>.</summary>
-    public PayUServiceCaller(IOptions<PayUServiceOptions> options, IHttpClientFactory httpClientFactory)
-    {
-        this.options = options.Value;
-        this.httpClientFactory = httpClientFactory;
-    }
-
-    /// <inheritdoc/>
-    public async Task<string> GetAccessTokenAsync()
-    {
-        using var client = httpClientFactory.CreateClient("PayU");
-        var content = new FormUrlEncodedContent([
-            new("grant_type",    "client_credentials"),
-            new("client_id",     options.ClientId),
-            new("client_secret", options.ClientSecret),
-        ]);
-        var response = await client.PostAsync($"{options.ServiceUrl}/pl/standard/user/oauth/authorize", content);
-        response.EnsureSuccessStatusCode();
-        var json = await response.Content.ReadAsStringAsync();
-        return JsonSerializer.Deserialize<PayUTokenResponse>(json)?.AccessToken ?? string.Empty;
-    }
-
-    /// <inheritdoc/>
-    public async Task<(string? orderId, string? redirectUri, string? error)> CreateOrderAsync(string token, PaymentRequest request)
-    {
-        var handler = new HttpClientHandler { AllowAutoRedirect = false };
-        using var client = new HttpClient(handler);
-        client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", token);
-
-        var amount = ((long)(request.Amount * 100)).ToString();
-        var body = new PayUOrderRequest
-        {
-            NotifyUrl     = options.NotifyUrl,
-            ContinueUrl   = options.ContinueUrl,
-            MerchantPosId = options.PosId,
-            Description   = request.Title ?? request.Description ?? "Order",
-            CurrencyCode  = request.Currency.ToUpperInvariant(),
-            TotalAmount   = amount,
-            Buyer         = new PayUBuyer { Email = request.Email ?? string.Empty, FirstName = request.FirstName ?? string.Empty, LastName = request.Surname ?? string.Empty },
-            Products      = [new PayUProduct { Name = request.Title ?? "Product", UnitPrice = amount }],
-        };
-
-        var content  = new StringContent(JsonSerializer.Serialize(body), Encoding.UTF8, "application/json");
-        var response = await client.PostAsync($"{options.ServiceUrl}/api/v2_1/orders", content);
-        var json     = await response.Content.ReadAsStringAsync();
-
-        if (response.StatusCode == System.Net.HttpStatusCode.Found || response.StatusCode == System.Net.HttpStatusCode.Redirect)
-        {
-            var location = response.Headers.Location?.ToString();
-            var result   = JsonSerializer.Deserialize<PayUOrderResponse>(json);
-            return (result?.OrderId, location ?? result?.RedirectUri, null);
-        }
-
-        if (response.IsSuccessStatusCode)
-        {
-            var result = JsonSerializer.Deserialize<PayUOrderResponse>(json);
-            return (result?.OrderId, result?.RedirectUri, null);
-        }
-
-        return (null, null, json);
-    }
-
-    /// <inheritdoc/>
-    public async Task<PaymentStatusEnum> GetOrderStatusAsync(string token, string orderId)
-    {
-        using var client = httpClientFactory.CreateClient("PayU");
-        client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", token);
-        var response = await client.GetAsync($"{options.ServiceUrl}/api/v2_1/orders/{orderId}");
-        if (!response.IsSuccessStatusCode) return PaymentStatusEnum.Rejected;
-        var json   = await response.Content.ReadAsStringAsync();
-        var result = JsonSerializer.Deserialize<PayUStatusResponse>(json);
-        var status = result?.Orders?.FirstOrDefault()?.Status;
-        return status switch
-        {
-            "COMPLETED"                => PaymentStatusEnum.Finished,
-            "WAITING_FOR_CONFIRMATION" => PaymentStatusEnum.Processing,
-            "PENDING"                  => PaymentStatusEnum.Processing,
-            "CANCELED"                 => PaymentStatusEnum.Rejected,
-            "REJECTED"                 => PaymentStatusEnum.Rejected,
-            _                          => PaymentStatusEnum.Created,
-        };
-    }
-
-    /// <inheritdoc/>
-    public bool VerifySignature(string body, string incomingSignature)
-    {
-        var parts = incomingSignature.Split(';')
-            .Select(p => p.Split('=', 2))
-            .Where(p => p.Length == 2)
-            .ToDictionary(p => p[0].Trim(), p => p[1].Trim());
-
-        if (!parts.TryGetValue("signature", out var receivedSig)) return false;
-        var algorithm = parts.GetValueOrDefault("algorithm", "MD5");
-
-        var data = body + options.SignatureKey;
-        string computed;
-
-        if (algorithm.Equals("SHA256", StringComparison.OrdinalIgnoreCase) || algorithm.Equals("SHA-256", StringComparison.OrdinalIgnoreCase))
-            computed = Convert.ToHexString(SHA256.HashData(Encoding.UTF8.GetBytes(data))).ToLowerInvariant();
-        else
-            computed = Convert.ToHexString(MD5.HashData(Encoding.UTF8.GetBytes(data))).ToLowerInvariant();
-
-        return string.Equals(computed, receivedSig, StringComparison.OrdinalIgnoreCase);
-    }
-}
-
-// ─── Provider ─────────────────────────────────────────────────────────────────
-
-/// <summary>Implementacja <see cref="IPaymentProvider"/> dla PayU.</summary>
-public class PayUProvider : IPaymentProvider, IWebhookPaymentProvider
-{
-    private readonly IPayUServiceCaller caller;
-
-    /// <summary>Inicjalizuje instancję <see cref="PayUProvider"/>.</summary>
-    public PayUProvider(IPayUServiceCaller caller) => this.caller = caller;
-
-    /// <inheritdoc/>
-    public string Key => "PayU";
-
-    /// <inheritdoc/>
-    public string Name => "PayU";
-
-    /// <inheritdoc/>
-    public string Description => "Operator płatności PayU — przelewy, BLIK, karty, raty.";
-
-    /// <inheritdoc/>
-    public string Url => "https://payu.pl";
-
-    /// <inheritdoc/>
-    public Task<ICollection<PaymentChannel>> GetPaymentChannels(string currency)
-    {
-        ICollection<PaymentChannel> channels = currency.ToUpperInvariant() switch
-        {
-            "PLN" =>
-            [
-                new PaymentChannel { Id = "blik",     Name = "BLIK",              Description = "BLIK",                PaymentModel = PaymentModel.OneTime },
-                new PaymentChannel { Id = "c",        Name = "Karta płatnicza",   Description = "Visa, Mastercard",    PaymentModel = PaymentModel.OneTime },
-                new PaymentChannel { Id = "o",        Name = "Przelew online",    Description = "Pekao, mBank, iPKO",  PaymentModel = PaymentModel.OneTime },
-                new PaymentChannel { Id = "ai",       Name = "Raty",              Description = "Raty PayU",           PaymentModel = PaymentModel.OneTime },
-                new PaymentChannel { Id = "ap",       Name = "Apple Pay",         Description = "Apple Pay",           PaymentModel = PaymentModel.OneTime },
-                new PaymentChannel { Id = "jp",       Name = "Google Pay",        Description = "Google Pay",          PaymentModel = PaymentModel.OneTime },
-            ],
-            _ =>
-            [
-                new PaymentChannel { Id = "c",  Name = "Karta płatnicza", Description = "Visa, Mastercard", PaymentModel = PaymentModel.OneTime },
-            ],
-        };
-        return Task.FromResult(channels);
-    }
-
-    /// <inheritdoc/>
-    public async Task<PaymentResponse> RequestPayment(PaymentRequest request)
-    {
-        var token = await caller.GetAccessTokenAsync();
-        var (orderId, redirectUri, error) = await caller.CreateOrderAsync(token, request);
-
-        if (orderId is null)
-            return new PaymentResponse { PaymentStatus = PaymentStatusEnum.Rejected, ResponseObject = error };
-
-        return new PaymentResponse
-        {
-            PaymentUniqueId = orderId,
-            RedirectUrl     = redirectUri,
-            PaymentStatus   = PaymentStatusEnum.Created,
-        };
-    }
-
-    /// <inheritdoc/>
-    public async Task<PaymentResponse> GetStatus(string paymentId)
-    {
-        var token  = await caller.GetAccessTokenAsync();
-        var status = await caller.GetOrderStatusAsync(token, paymentId);
-        return new PaymentResponse { PaymentUniqueId = paymentId, PaymentStatus = status };
-    }
-
-    // ─── IWebhookPaymentProvider ─────────────────────────────────────────────
-
-    /// <inheritdoc/>
-    public async Task<PaymentWebhookResult> HandleWebhookAsync(PaymentWebhookRequest request)
-    {
-        var body      = request.Body ?? string.Empty;
-        var signature = request.Headers.TryGetValue("OpenPayU-Signature", out var s) ? s.ToString() : string.Empty;
-
-        var payload = new TransactionStatusChangePayload
-        {
-            Payload         = body,
-            QueryParameters = new Dictionary<string, Microsoft.Extensions.Primitives.StringValues>
-            {
-                { "OpenPayU-Signature", signature },
-            },
-        };
-
-        var response = await TransactionStatusChange(payload);
-
-        if (response.PaymentStatus == PaymentStatusEnum.Rejected)
-        {
-            var msg = response.ResponseObject?.ToString() ?? string.Empty;
-            if (msg.Contains("signature", StringComparison.OrdinalIgnoreCase) ||
-                msg.Contains("hash",      StringComparison.OrdinalIgnoreCase) ||
-                msg.Contains("sign",      StringComparison.OrdinalIgnoreCase) ||
-                msg.Contains("hmac",      StringComparison.OrdinalIgnoreCase))
-                return PaymentWebhookResult.Fail(msg);
-        }
-
-        if (response.PaymentStatus == PaymentStatusEnum.Processing && string.IsNullOrEmpty(response.PaymentUniqueId))
-            return PaymentWebhookResult.Ignore("Non-actionable event");
-
-        return PaymentWebhookResult.Ok(response);
-    }
-
-    /// <inheritdoc/>
-    public Task<PaymentResponse> TransactionStatusChange(TransactionStatusChangePayload payload)
-    {
-        var body = payload.Payload?.ToString() ?? string.Empty;
-        var sig  = payload.QueryParameters.TryGetValue("OpenPayU-Signature", out var s) ? s.ToString() : string.Empty;
-
-        if (!caller.VerifySignature(body, sig))
-            return Task.FromResult(new PaymentResponse { PaymentStatus = PaymentStatusEnum.Rejected, ResponseObject = "Invalid signature" });
-
-        var status = PaymentStatusEnum.Processing;
-        try
-        {
-            var doc = JsonDocument.Parse(body);
-            if (doc.RootElement.TryGetProperty("order", out var orderEl) && orderEl.TryGetProperty("status", out var st))
-                status = st.GetString() switch
-                {
-                    "COMPLETED" => PaymentStatusEnum.Finished,
-                    "CANCELED"  => PaymentStatusEnum.Rejected,
-                    "REJECTED"  => PaymentStatusEnum.Rejected,
-                    _           => PaymentStatusEnum.Processing,
-                };
-        }
-        catch { /* ignore */ }
-
-        return Task.FromResult(new PaymentResponse { PaymentStatus = status, ResponseObject = "OK" });
-    }
-}
-
-// ─── DI ───────────────────────────────────────────────────────────────────────
-
-/// <summary>Rozszerzenia DI dla PayU.</summary>
-public static class PayUProviderExtensions
-{
-    /// <summary>Rejestruje <see cref="PayUProvider"/> i jego zależności w kontenerze DI.</summary>
-    public static void RegisterPayUProvider(this IServiceCollection services)
-    {
-        services.AddOptions<PayUServiceOptions>();
-        services.ConfigureOptions<PayUConfigureOptions>();
-        services.AddHttpClient("PayU");
-        services.AddTransient<IPayUServiceCaller, PayUServiceCaller>();
-        services.AddTransient<PayUProvider>();
-        services.AddTransient<IPaymentProvider>(sp => sp.GetRequiredService<PayUProvider>());
-        services.AddTransient<IWebhookPaymentProvider>(sp => sp.GetRequiredService<PayUProvider>());
-    }
-}
-
-/// <summary>Wczytuje opcje PayU z konfiguracji aplikacji.</summary>
-public class PayUConfigureOptions : IConfigureOptions<PayUServiceOptions>
-{
-    private readonly IConfiguration configuration;
-
-    /// <summary>Inicjalizuje instancję <see cref="PayUConfigureOptions"/>.</summary>
-    public PayUConfigureOptions(IConfiguration configuration) => this.configuration = configuration;
-
-    /// <inheritdoc/>
-    public void Configure(PayUServiceOptions options)
-    {
-        var s = configuration.GetSection(PayUServiceOptions.ConfigurationKey).Get<PayUServiceOptions>();
-        if (s is null) return;
-        options.ClientId     = s.ClientId;
-        options.ClientSecret = s.ClientSecret;
-        options.PosId        = s.PosId;
-        options.SignatureKey = s.SignatureKey;
-        options.ServiceUrl   = s.ServiceUrl;
-        options.NotifyUrl    = s.NotifyUrl;
-        options.ContinueUrl  = s.ContinueUrl;
-    }
-}
+using System.Net.Http;
+using System.Net.Http.Headers;
+using System.Security.Cryptography;
+using System.Text;
+using System.Text.Json;
+using System.Text.Json.Serialization;
+using Microsoft.Extensions.Configuration;
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Options;
+
+namespace TailoredApps.Shared.Payments.Provider.PayU;
+
+// ─── Options ─────────────────────────────────────────────────────────────────
+
+/// <summary>Konfiguracja PayU REST API v2.1. Sekcja: <c>Payments:Providers:PayU</c>.</summary>
+public class PayUServiceOptions
+{
+    /// <summary>Klucz sekcji konfiguracji.</summary>
+    public static string ConfigurationKey => "Payments:Providers:PayU";
+
+    /// <summary>Identyfikator klienta OAuth (client_id).</summary>
+    public string ClientId { get; set; } = string.Empty;
+
+    /// <summary>Sekret klienta OAuth (client_secret).</summary>
+    public string ClientSecret { get; set; } = string.Empty;
+
+    /// <summary>Identyfikator POS (merchantPosId).</summary>
+    public string PosId { get; set; } = string.Empty;
+
+    /// <summary>Klucz do podpisu powiadomień (second key / signature key).</summary>
+    public string SignatureKey { get; set; } = string.Empty;
+
+    /// <summary>Bazowy URL API PayU (sandbox: https://secure.snd.payu.com).</summary>
+    public string ServiceUrl { get; set; } = "https://secure.snd.payu.com";
+
+    /// <summary>URL powiadomień o statusie transakcji.</summary>
+    public string NotifyUrl { get; set; } = string.Empty;
+
+    /// <summary>URL powrotu po płatności.</summary>
+    public string ContinueUrl { get; set; } = string.Empty;
+}
+
+// ─── Internal models ─────────────────────────────────────────────────────────
+
+file class PayUTokenResponse
+{
+    [JsonPropertyName("access_token")] public string AccessToken { get; set; } = string.Empty;
+    [JsonPropertyName("token_type")] public string TokenType { get; set; } = string.Empty;
+    [JsonPropertyName("expires_in")] public int ExpiresIn { get; set; }
+}
+
+file class PayUOrderRequest
+{
+    [JsonPropertyName("notifyUrl")] public string NotifyUrl { get; set; } = string.Empty;
+    [JsonPropertyName("continueUrl")] public string ContinueUrl { get; set; } = string.Empty;
+    [JsonPropertyName("customerIp")] public string CustomerIp { get; set; } = "127.0.0.1";
+    [JsonPropertyName("merchantPosId")] public string MerchantPosId { get; set; } = string.Empty;
+    [JsonPropertyName("description")] public string Description { get; set; } = string.Empty;
+    [JsonPropertyName("currencyCode")] public string CurrencyCode { get; set; } = string.Empty;
+    [JsonPropertyName("totalAmount")] public string TotalAmount { get; set; } = string.Empty;
+    [JsonPropertyName("buyer")] public PayUBuyer? Buyer { get; set; }
+    [JsonPropertyName("products")] public List<PayUProduct> Products { get; set; } = [];
+}
+
+file class PayUBuyer
+{
+    [JsonPropertyName("email")] public string Email { get; set; } = string.Empty;
+    [JsonPropertyName("firstName")] public string FirstName { get; set; } = string.Empty;
+    [JsonPropertyName("lastName")] public string LastName { get; set; } = string.Empty;
+}
+
+file class PayUProduct
+{
+    /// <inheritdoc/>
+    [JsonPropertyName("name")] public string Name { get; set; } = string.Empty;
+    [JsonPropertyName("unitPrice")] public string UnitPrice { get; set; } = string.Empty;
+    [JsonPropertyName("quantity")] public string Quantity { get; set; } = "1";
+}
+
+file class PayUOrderResponse
+{
+    [JsonPropertyName("status")] public PayUStatus? Status { get; set; }
+    [JsonPropertyName("orderId")] public string? OrderId { get; set; }
+    [JsonPropertyName("redirectUri")] public string? RedirectUri { get; set; }
+}
+
+file class PayUStatus
+{
+    [JsonPropertyName("statusCode")] public string? StatusCode { get; set; }
+}
+
+file class PayUStatusResponse
+{
+    [JsonPropertyName("orders")] public List<PayUOrderDetail>? Orders { get; set; }
+}
+
+file class PayUOrderDetail
+{
+    [JsonPropertyName("orderId")] public string? OrderId { get; set; }
+    [JsonPropertyName("status")] public string? Status { get; set; }
+}
+
+// ─── Interface ────────────────────────────────────────────────────────────────
+
+/// <summary>Abstrakcja nad PayU REST API v2.1.</summary>
+public interface IPayUServiceCaller
+{
+    /// <summary>Pobiera token OAuth (grant_type=client_credentials).</summary>
+    Task<string> GetAccessTokenAsync();
+
+    /// <summary>Tworzy zamówienie w PayU i zwraca orderId + redirectUri.</summary>
+    Task<(string? orderId, string? redirectUri, string? error)> CreateOrderAsync(string token, PaymentRequest request);
+
+    /// <summary>Pobiera status zamówienia po orderId.</summary>
+    Task<PaymentStatusEnum> GetOrderStatusAsync(string token, string orderId);
+
+    /// <summary>Weryfikuje podpis powiadomienia (OpenPayU-Signature header).</summary>
+    bool VerifySignature(string body, string incomingSignature);
+}
+
+// ─── Caller ───────────────────────────────────────────────────────────────────
+
+/// <summary>Implementacja <see cref="IPayUServiceCaller"/>.</summary>
+public class PayUServiceCaller : IPayUServiceCaller
+{
+    private readonly PayUServiceOptions options;
+    private readonly IHttpClientFactory httpClientFactory;
+
+    /// <summary>Inicjalizuje instancję <see cref="PayUServiceCaller"/>.</summary>
+    public PayUServiceCaller(IOptions<PayUServiceOptions> options, IHttpClientFactory httpClientFactory)
+    {
+        this.options = options.Value;
+        this.httpClientFactory = httpClientFactory;
+    }
+
+    /// <inheritdoc/>
+    public async Task<string> GetAccessTokenAsync()
+    {
+        using var client = httpClientFactory.CreateClient("PayU");
+        var content = new FormUrlEncodedContent([
+            new("grant_type",    "client_credentials"),
+            new("client_id",     options.ClientId),
+            new("client_secret", options.ClientSecret),
+        ]);
+        var response = await client.PostAsync($"{options.ServiceUrl}/pl/standard/user/oauth/authorize", content);
+        response.EnsureSuccessStatusCode();
+        var json = await response.Content.ReadAsStringAsync();
+        return JsonSerializer.Deserialize<PayUTokenResponse>(json)?.AccessToken ?? string.Empty;
+    }
+
+    /// <inheritdoc/>
+    public async Task<(string? orderId, string? redirectUri, string? error)> CreateOrderAsync(string token, PaymentRequest request)
+    {
+        var handler = new HttpClientHandler { AllowAutoRedirect = false };
+        using var client = new HttpClient(handler);
+        client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", token);
+
+        var amount = ((long)(request.Amount * 100)).ToString();
+        var body = new PayUOrderRequest
+        {
+            NotifyUrl = options.NotifyUrl,
+            ContinueUrl = options.ContinueUrl,
+            MerchantPosId = options.PosId,
+            Description = request.Title ?? request.Description ?? "Order",
+            CurrencyCode = request.Currency.ToUpperInvariant(),
+            TotalAmount = amount,
+            Buyer = new PayUBuyer { Email = request.Email ?? string.Empty, FirstName = request.FirstName ?? string.Empty, LastName = request.Surname ?? string.Empty },
+            Products = [new PayUProduct { Name = request.Title ?? "Product", UnitPrice = amount }],
+        };
+
+        var content = new StringContent(JsonSerializer.Serialize(body), Encoding.UTF8, "application/json");
+        var response = await client.PostAsync($"{options.ServiceUrl}/api/v2_1/orders", content);
+        var json = await response.Content.ReadAsStringAsync();
+
+        if (response.StatusCode == System.Net.HttpStatusCode.Found || response.StatusCode == System.Net.HttpStatusCode.Redirect)
+        {
+            var location = response.Headers.Location?.ToString();
+            var result = JsonSerializer.Deserialize<PayUOrderResponse>(json);
+            return (result?.OrderId, location ?? result?.RedirectUri, null);
+        }
+
+        if (response.IsSuccessStatusCode)
+        {
+            var result = JsonSerializer.Deserialize<PayUOrderResponse>(json);
+            return (result?.OrderId, result?.RedirectUri, null);
+        }
+
+        return (null, null, json);
+    }
+
+    /// <inheritdoc/>
+    public async Task<PaymentStatusEnum> GetOrderStatusAsync(string token, string orderId)
+    {
+        using var client = httpClientFactory.CreateClient("PayU");
+        client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", token);
+        var response = await client.GetAsync($"{options.ServiceUrl}/api/v2_1/orders/{orderId}");
+        if (!response.IsSuccessStatusCode) return PaymentStatusEnum.Rejected;
+        var json = await response.Content.ReadAsStringAsync();
+        var result = JsonSerializer.Deserialize<PayUStatusResponse>(json);
+        var status = result?.Orders?.FirstOrDefault()?.Status;
+        return status switch
+        {
+            "COMPLETED" => PaymentStatusEnum.Finished,
+            "WAITING_FOR_CONFIRMATION" => PaymentStatusEnum.Processing,
+            "PENDING" => PaymentStatusEnum.Processing,
+            "CANCELED" => PaymentStatusEnum.Rejected,
+            "REJECTED" => PaymentStatusEnum.Rejected,
+            _ => PaymentStatusEnum.Created,
+        };
+    }
+
+    /// <inheritdoc/>
+    public bool VerifySignature(string body, string incomingSignature)
+    {
+        var parts = incomingSignature.Split(';')
+            .Select(p => p.Split('=', 2))
+            .Where(p => p.Length == 2)
+            .ToDictionary(p => p[0].Trim(), p => p[1].Trim());
+
+        if (!parts.TryGetValue("signature", out var receivedSig)) return false;
+        var algorithm = parts.GetValueOrDefault("algorithm", "MD5");
+
+        var data = body + options.SignatureKey;
+        string computed;
+
+        if (algorithm.Equals("SHA256", StringComparison.OrdinalIgnoreCase) || algorithm.Equals("SHA-256", StringComparison.OrdinalIgnoreCase))
+            computed = Convert.ToHexString(SHA256.HashData(Encoding.UTF8.GetBytes(data))).ToLowerInvariant();
+        else
+            computed = Convert.ToHexString(MD5.HashData(Encoding.UTF8.GetBytes(data))).ToLowerInvariant();
+
+        return string.Equals(computed, receivedSig, StringComparison.OrdinalIgnoreCase);
+    }
+}
+
+// ─── Provider ─────────────────────────────────────────────────────────────────
+
+/// <summary>Implementacja <see cref="IPaymentProvider"/> dla PayU.</summary>
+public class PayUProvider : IPaymentProvider, IWebhookPaymentProvider
+{
+    private readonly IPayUServiceCaller caller;
+
+    /// <summary>Inicjalizuje instancję <see cref="PayUProvider"/>.</summary>
+    public PayUProvider(IPayUServiceCaller caller) => this.caller = caller;
+
+    /// <inheritdoc/>
+    public string Key => "PayU";
+
+    /// <inheritdoc/>
+    public string Name => "PayU";
+
+    /// <inheritdoc/>
+    public string Description => "Operator płatności PayU — przelewy, BLIK, karty, raty.";
+
+    /// <inheritdoc/>
+    public string Url => "https://payu.pl";
+
+    /// <inheritdoc/>
+    public Task<ICollection<PaymentChannel>> GetPaymentChannels(string currency)
+    {
+        ICollection<PaymentChannel> channels = currency.ToUpperInvariant() switch
+        {
+            "PLN" =>
+            [
+                new PaymentChannel { Id = "blik",     Name = "BLIK",              Description = "BLIK",                PaymentModel = PaymentModel.OneTime },
+                new PaymentChannel { Id = "c",        Name = "Karta płatnicza",   Description = "Visa, Mastercard",    PaymentModel = PaymentModel.OneTime },
+                new PaymentChannel { Id = "o",        Name = "Przelew online",    Description = "Pekao, mBank, iPKO",  PaymentModel = PaymentModel.OneTime },
+                new PaymentChannel { Id = "ai",       Name = "Raty",              Description = "Raty PayU",           PaymentModel = PaymentModel.OneTime },
+                new PaymentChannel { Id = "ap",       Name = "Apple Pay",         Description = "Apple Pay",           PaymentModel = PaymentModel.OneTime },
+                new PaymentChannel { Id = "jp",       Name = "Google Pay",        Description = "Google Pay",          PaymentModel = PaymentModel.OneTime },
+            ],
+            _ =>
+            [
+                new PaymentChannel { Id = "c",  Name = "Karta płatnicza", Description = "Visa, Mastercard", PaymentModel = PaymentModel.OneTime },
+            ],
+        };
+        return Task.FromResult(channels);
+    }
+
+    /// <inheritdoc/>
+    public async Task<PaymentResponse> RequestPayment(PaymentRequest request)
+    {
+        var token = await caller.GetAccessTokenAsync();
+        var (orderId, redirectUri, error) = await caller.CreateOrderAsync(token, request);
+
+        if (orderId is null)
+            return new PaymentResponse { PaymentStatus = PaymentStatusEnum.Rejected, ResponseObject = error };
+
+        return new PaymentResponse
+        {
+            PaymentUniqueId = orderId,
+            RedirectUrl = redirectUri,
+            PaymentStatus = PaymentStatusEnum.Created,
+        };
+    }
+
+    /// <inheritdoc/>
+    public async Task<PaymentResponse> GetStatus(string paymentId)
+    {
+        var token = await caller.GetAccessTokenAsync();
+        var status = await caller.GetOrderStatusAsync(token, paymentId);
+        return new PaymentResponse { PaymentUniqueId = paymentId, PaymentStatus = status };
+    }
+
+    // ─── IWebhookPaymentProvider ─────────────────────────────────────────────
+
+    /// <inheritdoc/>
+    public async Task<PaymentWebhookResult> HandleWebhookAsync(PaymentWebhookRequest request)
+    {
+        var body = request.Body ?? string.Empty;
+        var signature = request.Headers.TryGetValue("OpenPayU-Signature", out var s) ? s.ToString() : string.Empty;
+
+        var payload = new TransactionStatusChangePayload
+        {
+            Payload = body,
+            QueryParameters = new Dictionary<string, Microsoft.Extensions.Primitives.StringValues>
+            {
+                { "OpenPayU-Signature", signature },
+            },
+        };
+
+        var response = await TransactionStatusChange(payload);
+
+        if (response.PaymentStatus == PaymentStatusEnum.Rejected)
+        {
+            var msg = response.ResponseObject?.ToString() ?? string.Empty;
+            if (msg.Contains("signature", StringComparison.OrdinalIgnoreCase) ||
+                msg.Contains("hash", StringComparison.OrdinalIgnoreCase) ||
+                msg.Contains("sign", StringComparison.OrdinalIgnoreCase) ||
+                msg.Contains("hmac", StringComparison.OrdinalIgnoreCase))
+                return PaymentWebhookResult.Fail(msg);
+        }
+
+        if (response.PaymentStatus == PaymentStatusEnum.Processing && string.IsNullOrEmpty(response.PaymentUniqueId))
+            return PaymentWebhookResult.Ignore("Non-actionable event");
+
+        return PaymentWebhookResult.Ok(response);
+    }
+
+    /// <inheritdoc/>
+    public Task<PaymentResponse> TransactionStatusChange(TransactionStatusChangePayload payload)
+    {
+        var body = payload.Payload?.ToString() ?? string.Empty;
+        var sig = payload.QueryParameters.TryGetValue("OpenPayU-Signature", out var s) ? s.ToString() : string.Empty;
+
+        if (!caller.VerifySignature(body, sig))
+            return Task.FromResult(new PaymentResponse { PaymentStatus = PaymentStatusEnum.Rejected, ResponseObject = "Invalid signature" });
+
+        var status = PaymentStatusEnum.Processing;
+        try
+        {
+            var doc = JsonDocument.Parse(body);
+            if (doc.RootElement.TryGetProperty("order", out var orderEl) && orderEl.TryGetProperty("status", out var st))
+                status = st.GetString() switch
+                {
+                    "COMPLETED" => PaymentStatusEnum.Finished,
+                    "CANCELED" => PaymentStatusEnum.Rejected,
+                    "REJECTED" => PaymentStatusEnum.Rejected,
+                    _ => PaymentStatusEnum.Processing,
+                };
+        }
+        catch { /* ignore */ }
+
+        return Task.FromResult(new PaymentResponse { PaymentStatus = status, ResponseObject = "OK" });
+    }
+}
+
+// ─── DI ───────────────────────────────────────────────────────────────────────
+
+/// <summary>Rozszerzenia DI dla PayU.</summary>
+public static class PayUProviderExtensions
+{
+    /// <summary>Rejestruje <see cref="PayUProvider"/> i jego zależności w kontenerze DI.</summary>
+    public static void RegisterPayUProvider(this IServiceCollection services)
+    {
+        services.AddOptions<PayUServiceOptions>();
+        services.ConfigureOptions<PayUConfigureOptions>();
+        services.AddHttpClient("PayU");
+        services.AddTransient<IPayUServiceCaller, PayUServiceCaller>();
+        services.AddTransient<PayUProvider>();
+        services.AddTransient<IWebhookPaymentProvider>(sp => sp.GetRequiredService<PayUProvider>());
+    }
+}
+
+/// <summary>Wczytuje opcje PayU z konfiguracji aplikacji.</summary>
+public class PayUConfigureOptions : IConfigureOptions<PayUServiceOptions>
+{
+    private readonly IConfiguration configuration;
+
+    /// <summary>Inicjalizuje instancję <see cref="PayUConfigureOptions"/>.</summary>
+    public PayUConfigureOptions(IConfiguration configuration) => this.configuration = configuration;
+
+    /// <inheritdoc/>
+    public void Configure(PayUServiceOptions options)
+    {
+        var s = configuration.GetSection(PayUServiceOptions.ConfigurationKey).Get<PayUServiceOptions>();
+        if (s is null) return;
+        options.ClientId = s.ClientId;
+        options.ClientSecret = s.ClientSecret;
+        options.PosId = s.PosId;
+        options.SignatureKey = s.SignatureKey;
+        options.ServiceUrl = s.ServiceUrl;
+        options.NotifyUrl = s.NotifyUrl;
+        options.ContinueUrl = s.ContinueUrl;
+    }
+}
diff --git a/src/TailoredApps.Shared.Payments.Provider.Przelewy24/Przelewy24Provider.cs b/src/TailoredApps.Shared.Payments.Provider.Przelewy24/Przelewy24Provider.cs
index b5e65c2..4801b8e 100644
--- a/src/TailoredApps.Shared.Payments.Provider.Przelewy24/Przelewy24Provider.cs
+++ b/src/TailoredApps.Shared.Payments.Provider.Przelewy24/Przelewy24Provider.cs
@@ -1,359 +1,370 @@
-using System.Net.Http;
-using System.Net.Http.Headers;
-using System.Security.Cryptography;
-using System.Text;
-using System.Text.Json;
-using System.Text.Json.Serialization;
-using Microsoft.Extensions.Configuration;
-using Microsoft.Extensions.DependencyInjection;
-using Microsoft.Extensions.Options;
-
-namespace TailoredApps.Shared.Payments.Provider.Przelewy24;
-
-// ─── Options ─────────────────────────────────────────────────────────────────
-
-/// <summary>Konfiguracja Przelewy24. Sekcja: <c>Payments:Providers:Przelewy24</c>.</summary>
-public class Przelewy24ServiceOptions
-{
-    /// <summary>Klucz sekcji konfiguracji.</summary>
-    public static string ConfigurationKey => "Payments:Providers:Przelewy24";
-    public int    MerchantId { get; set; }
-    public int    PosId      { get; set; }
-    /// <summary>ApiKey.</summary>
-    public string ApiKey     { get; set; } = string.Empty;
-    /// <summary>CrcKey.</summary>
-    public string CrcKey     { get; set; } = string.Empty;
-    /// <summary>ServiceUrl.</summary>
-    public string ServiceUrl { get; set; } = "https://secure.przelewy24.pl";
-    /// <summary>ReturnUrl.</summary>
-    public string ReturnUrl  { get; set; } = string.Empty;
-    /// <summary>NotifyUrl.</summary>
-    public string NotifyUrl  { get; set; } = string.Empty;
-}
-
-// ─── Internal models ─────────────────────────────────────────────────────────
-
-file class P24RegisterRequest
-{
-    [JsonPropertyName("merchantId")]   public int    MerchantId   { get; set; }
-    [JsonPropertyName("posId")]        public int    PosId        { get; set; }
-    [JsonPropertyName("sessionId")]    public string SessionId    { get; set; } = string.Empty;
-    [JsonPropertyName("amount")]       public long   Amount       { get; set; }
-    [JsonPropertyName("currency")]     public string Currency     { get; set; } = string.Empty;
-    [JsonPropertyName("description")]  public string Description  { get; set; } = string.Empty;
-    [JsonPropertyName("email")]        public string Email        { get; set; } = string.Empty;
-    [JsonPropertyName("urlReturn")]    public string UrlReturn    { get; set; } = string.Empty;
-    [JsonPropertyName("urlStatus")]    public string UrlStatus    { get; set; } = string.Empty;
-    [JsonPropertyName("sign")]         public string Sign         { get; set; } = string.Empty;
-    [JsonPropertyName("encoding")]     public string Encoding     { get; set; } = "UTF-8";
-}
-
-file class P24RegisterResponse
-{
-    [JsonPropertyName("data")] public P24RegisterData? Data { get; set; }
-}
-
-file class P24RegisterData
-{
-    [JsonPropertyName("token")] public string? Token { get; set; }
-}
-
-file class P24VerifyRequest
-{
-    [JsonPropertyName("merchantId")]  public int    MerchantId  { get; set; }
-    [JsonPropertyName("posId")]       public int    PosId       { get; set; }
-    [JsonPropertyName("sessionId")]   public string SessionId   { get; set; } = string.Empty;
-    [JsonPropertyName("amount")]      public long   Amount      { get; set; }
-    [JsonPropertyName("currency")]    public string Currency    { get; set; } = string.Empty;
-    [JsonPropertyName("orderId")]     public int    OrderId     { get; set; }
-    [JsonPropertyName("sign")]        public string Sign        { get; set; } = string.Empty;
-}
-
-// ─── Interface ────────────────────────────────────────────────────────────────
-
-/// <summary>Abstrakcja nad Przelewy24 REST API.</summary>
-public interface IPrzelewy24ServiceCaller
-{
-    /// <summary>Wywołanie API.</summary>
-    Task<(string? token, string? error)> RegisterTransactionAsync(PaymentRequest request, string sessionId);
-    /// <summary>Wywołanie API.</summary>
-    Task<PaymentStatusEnum> VerifyTransactionAsync(string sessionId, long amount, string currency, int orderId);
-    /// <summary>Oblicza podpis.</summary>
-    string ComputeSign(string sessionId, int merchantId, long amount, string currency);
-    /// <summary>Weryfikuje podpis powiadomienia.</summary>
-    bool VerifyNotification(string body);
-}
-
-// ─── Caller ───────────────────────────────────────────────────────────────────
-
-/// <summary>Implementacja <see cref="IPrzelewy24ServiceCaller"/>.</summary>
-public class Przelewy24ServiceCaller : IPrzelewy24ServiceCaller
-{
-    private readonly Przelewy24ServiceOptions options;
-    private readonly IHttpClientFactory httpClientFactory;
-
-    /// <summary>Inicjalizuje instancję callera.</summary>
-    public Przelewy24ServiceCaller(IOptions<Przelewy24ServiceOptions> options, IHttpClientFactory httpClientFactory)
-    {
-        this.options = options.Value;
-        this.httpClientFactory = httpClientFactory;
-    }
-
-    private HttpClient CreateClient()
-    {
-        var client = httpClientFactory.CreateClient("Przelewy24");
-        var credentials = Convert.ToBase64String(System.Text.Encoding.UTF8.GetBytes($"{options.PosId}:{options.ApiKey}"));
-        client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Basic", credentials);
-        client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
-        return client;
-    }
-
-    /// <inheritdoc/>
-    public async Task<(string? token, string? error)> RegisterTransactionAsync(PaymentRequest request, string sessionId)
-    {
-        using var client = CreateClient();
-        var amount = (long)(request.Amount * 100);
-        var sign = ComputeSign(sessionId, options.MerchantId, amount, request.Currency);
-
-        var body = new P24RegisterRequest
-        {
-            MerchantId  = options.MerchantId,
-            PosId       = options.PosId,
-            SessionId   = sessionId,
-            Amount      = amount,
-            Currency    = request.Currency.ToUpperInvariant(),
-            Description = request.Title ?? request.Description ?? "Order",
-            Email       = request.Email ?? string.Empty,
-            UrlReturn   = options.ReturnUrl,
-            UrlStatus   = options.NotifyUrl,
-            Sign        = sign,
-        };
-
-        var content = new StringContent(JsonSerializer.Serialize(body), System.Text.Encoding.UTF8, "application/json");
-        var response = await client.PostAsync($"{options.ServiceUrl}/api/v1/transaction/register", content);
-        var json = await response.Content.ReadAsStringAsync();
-        var result = JsonSerializer.Deserialize<P24RegisterResponse>(json);
-        return (result?.Data?.Token, response.IsSuccessStatusCode ? null : json);
-    }
-
-    /// <inheritdoc/>
-    public async Task<PaymentStatusEnum> VerifyTransactionAsync(string sessionId, long amount, string currency, int orderId)
-    {
-        using var client = CreateClient();
-        var sign = ComputeVerifySign(sessionId, orderId, options.MerchantId, amount, currency);
-        var body = new P24VerifyRequest
-        {
-            MerchantId = options.MerchantId,
-            PosId      = options.PosId,
-            SessionId  = sessionId,
-            Amount     = amount,
-            Currency   = currency.ToUpperInvariant(),
-            OrderId    = orderId,
-            Sign       = sign,
-        };
-        var content = new StringContent(JsonSerializer.Serialize(body), System.Text.Encoding.UTF8, "application/json");
-        var response = await client.PutAsync($"{options.ServiceUrl}/api/v1/transaction/verify", content);
-        return response.IsSuccessStatusCode ? PaymentStatusEnum.Finished : PaymentStatusEnum.Rejected;
-    }
-
-    public string ComputeSign(string sessionId, int merchantId, long amount, string currency)
-    {
-        var json = JsonSerializer.Serialize(new { sessionId, merchantId, amount, currency, crc = options.CrcKey });
-        var bytes = SHA384.HashData(System.Text.Encoding.UTF8.GetBytes(json));
-        return Convert.ToHexString(bytes).ToLowerInvariant();
-    }
-
-    private string ComputeVerifySign(string sessionId, int orderId, int merchantId, long amount, string currency)
-    {
-        var json = JsonSerializer.Serialize(new { sessionId, orderId, merchantId, amount, currency, crc = options.CrcKey });
-        var bytes = SHA384.HashData(System.Text.Encoding.UTF8.GetBytes(json));
-        return Convert.ToHexString(bytes).ToLowerInvariant();
-    }
-
-    /// <inheritdoc/>
-    public bool VerifyNotification(string body)
-    {
-        try
-        {
-            var doc = JsonDocument.Parse(body);
-            if (!doc.RootElement.TryGetProperty("sign", out var signEl)) return false;
-            var receivedSign = signEl.GetString() ?? string.Empty;
-
-            doc.RootElement.TryGetProperty("sessionId", out var sid);
-            doc.RootElement.TryGetProperty("orderId", out var oid);
-            doc.RootElement.TryGetProperty("merchantId", out var mid);
-            doc.RootElement.TryGetProperty("amount", out var amt);
-            doc.RootElement.TryGetProperty("currency", out var cur);
-
-            var json = JsonSerializer.Serialize(new
-            {
-                sessionId  = sid.GetString(),
-                orderId    = oid.GetInt32(),
-                merchantId = mid.GetInt32(),
-                amount     = amt.GetInt64(),
-                currency   = cur.GetString(),
-                crc        = options.CrcKey,
-            });
-            var expected = Convert.ToHexString(SHA384.HashData(System.Text.Encoding.UTF8.GetBytes(json))).ToLowerInvariant();
-            return string.Equals(expected, receivedSign, StringComparison.OrdinalIgnoreCase);
-        }
-        catch { return false; }
-    }
-}
-
-// ─── Provider ─────────────────────────────────────────────────────────────────
-
-/// <summary>Implementacja <see cref="IPaymentProvider"/> dla Przelewy24.</summary>
-public class Przelewy24Provider : IPaymentProvider, IWebhookPaymentProvider
-{
-    private readonly IPrzelewy24ServiceCaller caller;
-    private readonly Przelewy24ServiceOptions options;
-
-    /// <summary>Inicjalizuje instancję providera.</summary>
-    public Przelewy24Provider(IPrzelewy24ServiceCaller caller, IOptions<Przelewy24ServiceOptions> options)
-    {
-        this.caller  = caller;
-        this.options = options.Value;
-    }
-
-    public string Key         => "Przelewy24";
-    public string Name        => "Przelewy24";
-    /// <inheritdoc/>
-    public string Description => "Operator płatności online Przelewy24 — przelewy, BLIK, karty.";
-    public string Url         => "https://przelewy24.pl";
-
-    /// <inheritdoc/>
-    public Task<ICollection<PaymentChannel>> GetPaymentChannels(string currency)
-    {
-        ICollection<PaymentChannel> channels =
-        [
-            new PaymentChannel { Id = "online_transfer", Name = "Przelew online",  Description = "Wszystkie banki",      PaymentModel = PaymentModel.OneTime },
-            new PaymentChannel { Id = "blik",            Name = "BLIK",            Description = "Płatność BLIK",        PaymentModel = PaymentModel.OneTime },
-            new PaymentChannel { Id = "card",            Name = "Karta płatnicza", Description = "Visa, Mastercard",     PaymentModel = PaymentModel.OneTime },
-        ];
-        return Task.FromResult(channels);
-    }
-
-    /// <inheritdoc/>
-    public async Task<PaymentResponse> RequestPayment(PaymentRequest request)
-    {
-        var sessionId = Guid.NewGuid().ToString("N");
-        var (token, error) = await caller.RegisterTransactionAsync(request, sessionId);
-
-        if (token is null)
-            return new PaymentResponse { PaymentStatus = PaymentStatusEnum.Rejected, ResponseObject = error };
-
-        return new PaymentResponse
-        {
-            PaymentUniqueId = sessionId,
-            RedirectUrl     = $"{options.ServiceUrl}/trnRequest/{token}",
-            PaymentStatus   = PaymentStatusEnum.Created,
-        };
-    }
-
-    /// <inheritdoc/>
-    public Task<PaymentResponse> GetStatus(string paymentId)
-        => Task.FromResult(new PaymentResponse { PaymentUniqueId = paymentId, PaymentStatus = PaymentStatusEnum.Processing });
-
-    // ─── IWebhookPaymentProvider ─────────────────────────────────────────────
-
-    /// <inheritdoc/>
-    public async Task<PaymentWebhookResult> HandleWebhookAsync(PaymentWebhookRequest request)
-    {
-        var body = request.Body ?? string.Empty;
-
-        var payload = new TransactionStatusChangePayload
-        {
-            Payload         = body,
-            QueryParameters = new Dictionary<string, Microsoft.Extensions.Primitives.StringValues>(),
-        };
-
-        var response = await TransactionStatusChange(payload);
-
-        if (response.PaymentStatus == PaymentStatusEnum.Rejected)
-        {
-            var msg = response.ResponseObject?.ToString() ?? string.Empty;
-            if (msg.Contains("signature", StringComparison.OrdinalIgnoreCase) ||
-                msg.Contains("hash",      StringComparison.OrdinalIgnoreCase) ||
-                msg.Contains("sign",      StringComparison.OrdinalIgnoreCase) ||
-                msg.Contains("hmac",      StringComparison.OrdinalIgnoreCase))
-                return PaymentWebhookResult.Fail(msg);
-        }
-
-        if (response.PaymentStatus == PaymentStatusEnum.Processing && string.IsNullOrEmpty(response.PaymentUniqueId))
-            return PaymentWebhookResult.Ignore("Non-actionable event");
-
-        return PaymentWebhookResult.Ok(response);
-    }
-
-    /// <inheritdoc/>
-    public async Task<PaymentResponse> TransactionStatusChange(TransactionStatusChangePayload payload)
-    {
-        var body = payload.Payload?.ToString() ?? string.Empty;
-        if (!caller.VerifyNotification(body))
-            return new PaymentResponse { PaymentStatus = PaymentStatusEnum.Rejected, ResponseObject = "Invalid signature" };
-
-        try
-        {
-            var doc  = JsonDocument.Parse(body);
-            var root = doc.RootElement;
-
-            if (!root.TryGetProperty("sessionId",  out var sid)  ||
-                !root.TryGetProperty("amount",      out var amt)  ||
-                !root.TryGetProperty("currency",    out var cur)  ||
-                !root.TryGetProperty("orderId",     out var oid))
-                return new PaymentResponse { PaymentStatus = PaymentStatusEnum.Rejected, ResponseObject = "Missing fields" };
-
-            var status = await caller.VerifyTransactionAsync(
-                sid.GetString()!,
-                amt.GetInt64(),
-                cur.GetString()!,
-                oid.GetInt32());
-
-            return new PaymentResponse { PaymentStatus = status, ResponseObject = "OK" };
-        }
-        catch
-        {
-            return new PaymentResponse { PaymentStatus = PaymentStatusEnum.Rejected, ResponseObject = "Parse error" };
-        }
-    }
-}
-
-// ─── DI ───────────────────────────────────────────────────────────────────────
-
-/// <summary>Rozszerzenia DI dla Przelewy24.</summary>
-public static class Przelewy24ProviderExtensions
-{
-    /// <summary>Rejestruje provider i jego zależności w kontenerze DI.</summary>
-    public static void RegisterPrzelewy24Provider(this IServiceCollection services)
-    {
-        services.AddOptions<Przelewy24ServiceOptions>();
-        services.ConfigureOptions<Przelewy24ConfigureOptions>();
-        services.AddHttpClient("Przelewy24");
-        services.AddTransient<IPrzelewy24ServiceCaller, Przelewy24ServiceCaller>();
-        services.AddTransient<Przelewy24Provider>();
-        services.AddTransient<IPaymentProvider>(sp => sp.GetRequiredService<Przelewy24Provider>());
-        services.AddTransient<IWebhookPaymentProvider>(sp => sp.GetRequiredService<Przelewy24Provider>());
-    }
-}
-
-/// <summary>Wczytuje opcje Przelewy24 z konfiguracji.</summary>
-public class Przelewy24ConfigureOptions : IConfigureOptions<Przelewy24ServiceOptions>
-{
-    private readonly IConfiguration configuration;
-    /// <summary>Inicjalizuje instancję konfiguracji.</summary>
-    public Przelewy24ConfigureOptions(IConfiguration configuration) => this.configuration = configuration;
-    /// <inheritdoc/>
-    public void Configure(Przelewy24ServiceOptions options)
-    {
-        var s = configuration.GetSection(Przelewy24ServiceOptions.ConfigurationKey).Get<Przelewy24ServiceOptions>();
-        if (s is null) return;
-        options.MerchantId = s.MerchantId;
-        options.PosId      = s.PosId;
-        options.ApiKey     = s.ApiKey;
-        options.CrcKey     = s.CrcKey;
-        options.ServiceUrl = s.ServiceUrl;
-        options.ReturnUrl  = s.ReturnUrl;
-        options.NotifyUrl  = s.NotifyUrl;
-    }
-}
+using System.Net.Http;
+using System.Net.Http.Headers;
+using System.Security.Cryptography;
+using System.Text;
+using System.Text.Json;
+using System.Text.Json.Serialization;
+using Microsoft.Extensions.Configuration;
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Options;
+
+namespace TailoredApps.Shared.Payments.Provider.Przelewy24;
+
+// ─── Options ─────────────────────────────────────────────────────────────────
+
+/// <summary>Konfiguracja Przelewy24. Sekcja: <c>Payments:Providers:Przelewy24</c>.</summary>
+public class Przelewy24ServiceOptions
+{
+    /// <summary>Klucz sekcji konfiguracji.</summary>
+    public static string ConfigurationKey => "Payments:Providers:Przelewy24";
+    /// <summary>Przelewy24 merchant identifier assigned in the merchant panel.</summary>
+    public int MerchantId { get; set; }
+    /// <summary>Point-of-sale (POS) identifier. Usually equals <see cref="MerchantId"/> for basic accounts.</summary>
+    public int PosId { get; set; }
+    /// <summary>ApiKey.</summary>
+    public string ApiKey { get; set; } = string.Empty;
+    /// <summary>CrcKey.</summary>
+    public string CrcKey { get; set; } = string.Empty;
+    /// <summary>ServiceUrl.</summary>
+    public string ServiceUrl { get; set; } = "https://secure.przelewy24.pl";
+    /// <summary>ReturnUrl.</summary>
+    public string ReturnUrl { get; set; } = string.Empty;
+    /// <summary>NotifyUrl.</summary>
+    public string NotifyUrl { get; set; } = string.Empty;
+}
+
+// ─── Internal models ─────────────────────────────────────────────────────────
+
+file class P24RegisterRequest
+{
+    [JsonPropertyName("merchantId")] public int MerchantId { get; set; }
+    [JsonPropertyName("posId")] public int PosId { get; set; }
+    [JsonPropertyName("sessionId")] public string SessionId { get; set; } = string.Empty;
+    [JsonPropertyName("amount")] public long Amount { get; set; }
+    [JsonPropertyName("currency")] public string Currency { get; set; } = string.Empty;
+    /// <inheritdoc/>
+    [JsonPropertyName("description")] public string Description { get; set; } = string.Empty;
+    [JsonPropertyName("email")] public string Email { get; set; } = string.Empty;
+    [JsonPropertyName("urlReturn")] public string UrlReturn { get; set; } = string.Empty;
+    [JsonPropertyName("urlStatus")] public string UrlStatus { get; set; } = string.Empty;
+    [JsonPropertyName("sign")] public string Sign { get; set; } = string.Empty;
+    [JsonPropertyName("encoding")] public string Encoding { get; set; } = "UTF-8";
+}
+
+file class P24RegisterResponse
+{
+    [JsonPropertyName("data")] public P24RegisterData? Data { get; set; }
+}
+
+file class P24RegisterData
+{
+    [JsonPropertyName("token")] public string? Token { get; set; }
+}
+
+file class P24VerifyRequest
+{
+    [JsonPropertyName("merchantId")] public int MerchantId { get; set; }
+    [JsonPropertyName("posId")] public int PosId { get; set; }
+    [JsonPropertyName("sessionId")] public string SessionId { get; set; } = string.Empty;
+    [JsonPropertyName("amount")] public long Amount { get; set; }
+    [JsonPropertyName("currency")] public string Currency { get; set; } = string.Empty;
+    [JsonPropertyName("orderId")] public int OrderId { get; set; }
+    [JsonPropertyName("sign")] public string Sign { get; set; } = string.Empty;
+}
+
+// ─── Interface ────────────────────────────────────────────────────────────────
+
+/// <summary>Abstrakcja nad Przelewy24 REST API.</summary>
+public interface IPrzelewy24ServiceCaller
+{
+    /// <summary>Wywołanie API.</summary>
+    Task<(string? token, string? error)> RegisterTransactionAsync(PaymentRequest request, string sessionId);
+    /// <summary>Wywołanie API.</summary>
+    Task<PaymentStatusEnum> VerifyTransactionAsync(string sessionId, long amount, string currency, int orderId);
+    /// <summary>Computes the SHA-384 signature required by Przelewy24 for a transaction.</summary>
+    /// <param name="sessionId">Unique session identifier for the transaction.</param>
+    /// <param name="merchantId">Przelewy24 merchant identifier.</param>
+    /// <param name="amount">Transaction amount in the smallest currency unit (e.g. grosz for PLN).</param>
+    /// <param name="currency">ISO 4217 currency code (e.g. "PLN").</param>
+    /// <returns>Hex-encoded SHA-384 hash of the sign string.</returns>
+    string ComputeSign(string sessionId, int merchantId, long amount, string currency);
+    /// <summary>Weryfikuje podpis powiadomienia.</summary>
+    bool VerifyNotification(string body);
+}
+
+// ─── Caller ───────────────────────────────────────────────────────────────────
+
+/// <summary>Implementacja <see cref="IPrzelewy24ServiceCaller"/>.</summary>
+public class Przelewy24ServiceCaller : IPrzelewy24ServiceCaller
+{
+    private readonly Przelewy24ServiceOptions options;
+    private readonly IHttpClientFactory httpClientFactory;
+
+    /// <summary>Inicjalizuje instancję callera.</summary>
+    public Przelewy24ServiceCaller(IOptions<Przelewy24ServiceOptions> options, IHttpClientFactory httpClientFactory)
+    {
+        this.options = options.Value;
+        this.httpClientFactory = httpClientFactory;
+    }
+
+    private HttpClient CreateClient()
+    {
+        var client = httpClientFactory.CreateClient("Przelewy24");
+        var credentials = Convert.ToBase64String(System.Text.Encoding.UTF8.GetBytes($"{options.PosId}:{options.ApiKey}"));
+        client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Basic", credentials);
+        client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
+        return client;
+    }
+
+    /// <inheritdoc/>
+    public async Task<(string? token, string? error)> RegisterTransactionAsync(PaymentRequest request, string sessionId)
+    {
+        using var client = CreateClient();
+        var amount = (long)(request.Amount * 100);
+        var sign = ComputeSign(sessionId, options.MerchantId, amount, request.Currency);
+
+        var body = new P24RegisterRequest
+        {
+            MerchantId = options.MerchantId,
+            PosId = options.PosId,
+            SessionId = sessionId,
+            Amount = amount,
+            Currency = request.Currency.ToUpperInvariant(),
+            Description = request.Title ?? request.Description ?? "Order",
+            Email = request.Email ?? string.Empty,
+            UrlReturn = options.ReturnUrl,
+            UrlStatus = options.NotifyUrl,
+            Sign = sign,
+        };
+
+        var content = new StringContent(JsonSerializer.Serialize(body), System.Text.Encoding.UTF8, "application/json");
+        var response = await client.PostAsync($"{options.ServiceUrl}/api/v1/transaction/register", content);
+        var json = await response.Content.ReadAsStringAsync();
+        var result = JsonSerializer.Deserialize<P24RegisterResponse>(json);
+        return (result?.Data?.Token, response.IsSuccessStatusCode ? null : json);
+    }
+
+    /// <inheritdoc/>
+    public async Task<PaymentStatusEnum> VerifyTransactionAsync(string sessionId, long amount, string currency, int orderId)
+    {
+        using var client = CreateClient();
+        var sign = ComputeVerifySign(sessionId, orderId, options.MerchantId, amount, currency);
+        var body = new P24VerifyRequest
+        {
+            MerchantId = options.MerchantId,
+            PosId = options.PosId,
+            SessionId = sessionId,
+            Amount = amount,
+            Currency = currency.ToUpperInvariant(),
+            OrderId = orderId,
+            Sign = sign,
+        };
+        var content = new StringContent(JsonSerializer.Serialize(body), System.Text.Encoding.UTF8, "application/json");
+        var response = await client.PutAsync($"{options.ServiceUrl}/api/v1/transaction/verify", content);
+        return response.IsSuccessStatusCode ? PaymentStatusEnum.Finished : PaymentStatusEnum.Rejected;
+    }
+
+    /// <inheritdoc/>
+    public string ComputeSign(string sessionId, int merchantId, long amount, string currency)
+    {
+        var json = JsonSerializer.Serialize(new { sessionId, merchantId, amount, currency, crc = options.CrcKey });
+        var bytes = SHA384.HashData(System.Text.Encoding.UTF8.GetBytes(json));
+        return Convert.ToHexString(bytes).ToLowerInvariant();
+    }
+
+    private string ComputeVerifySign(string sessionId, int orderId, int merchantId, long amount, string currency)
+    {
+        var json = JsonSerializer.Serialize(new { sessionId, orderId, merchantId, amount, currency, crc = options.CrcKey });
+        var bytes = SHA384.HashData(System.Text.Encoding.UTF8.GetBytes(json));
+        return Convert.ToHexString(bytes).ToLowerInvariant();
+    }
+
+    /// <inheritdoc/>
+    public bool VerifyNotification(string body)
+    {
+        try
+        {
+            var doc = JsonDocument.Parse(body);
+            if (!doc.RootElement.TryGetProperty("sign", out var signEl)) return false;
+            var receivedSign = signEl.GetString() ?? string.Empty;
+
+            doc.RootElement.TryGetProperty("sessionId", out var sid);
+            doc.RootElement.TryGetProperty("orderId", out var oid);
+            doc.RootElement.TryGetProperty("merchantId", out var mid);
+            doc.RootElement.TryGetProperty("amount", out var amt);
+            doc.RootElement.TryGetProperty("currency", out var cur);
+
+            var json = JsonSerializer.Serialize(new
+            {
+                sessionId = sid.GetString(),
+                orderId = oid.GetInt32(),
+                merchantId = mid.GetInt32(),
+                amount = amt.GetInt64(),
+                currency = cur.GetString(),
+                crc = options.CrcKey,
+            });
+            var expected = Convert.ToHexString(SHA384.HashData(System.Text.Encoding.UTF8.GetBytes(json))).ToLowerInvariant();
+            return string.Equals(expected, receivedSign, StringComparison.OrdinalIgnoreCase);
+        }
+        catch { return false; }
+    }
+}
+
+// ─── Provider ─────────────────────────────────────────────────────────────────
+
+/// <summary>Implementacja <see cref="IPaymentProvider"/> dla Przelewy24.</summary>
+public class Przelewy24Provider : IPaymentProvider, IWebhookPaymentProvider
+{
+    private readonly IPrzelewy24ServiceCaller caller;
+    private readonly Przelewy24ServiceOptions options;
+
+    /// <summary>Inicjalizuje instancję providera.</summary>
+    public Przelewy24Provider(IPrzelewy24ServiceCaller caller, IOptions<Przelewy24ServiceOptions> options)
+    {
+        this.caller = caller;
+        this.options = options.Value;
+    }
+
+    /// <inheritdoc/>
+    public string Key => "Przelewy24";
+    /// <inheritdoc/>
+    public string Name => "Przelewy24";
+    /// <inheritdoc/>
+    public string Description => "Operator płatności online Przelewy24 — przelewy, BLIK, karty.";
+    /// <inheritdoc/>
+    public string Url => "https://przelewy24.pl";
+
+    /// <inheritdoc/>
+    public Task<ICollection<PaymentChannel>> GetPaymentChannels(string currency)
+    {
+        ICollection<PaymentChannel> channels =
+        [
+            new PaymentChannel { Id = "online_transfer", Name = "Przelew online",  Description = "Wszystkie banki",      PaymentModel = PaymentModel.OneTime },
+            new PaymentChannel { Id = "blik",            Name = "BLIK",            Description = "Płatność BLIK",        PaymentModel = PaymentModel.OneTime },
+            new PaymentChannel { Id = "card",            Name = "Karta płatnicza", Description = "Visa, Mastercard",     PaymentModel = PaymentModel.OneTime },
+        ];
+        return Task.FromResult(channels);
+    }
+
+    /// <inheritdoc/>
+    public async Task<PaymentResponse> RequestPayment(PaymentRequest request)
+    {
+        var sessionId = Guid.NewGuid().ToString("N");
+        var (token, error) = await caller.RegisterTransactionAsync(request, sessionId);
+
+        if (token is null)
+            return new PaymentResponse { PaymentStatus = PaymentStatusEnum.Rejected, ResponseObject = error };
+
+        return new PaymentResponse
+        {
+            PaymentUniqueId = sessionId,
+            RedirectUrl = $"{options.ServiceUrl}/trnRequest/{token}",
+            PaymentStatus = PaymentStatusEnum.Created,
+        };
+    }
+
+    /// <inheritdoc/>
+    public Task<PaymentResponse> GetStatus(string paymentId)
+        => Task.FromResult(new PaymentResponse { PaymentUniqueId = paymentId, PaymentStatus = PaymentStatusEnum.Processing });
+
+    // ─── IWebhookPaymentProvider ─────────────────────────────────────────────
+
+    /// <inheritdoc/>
+    public async Task<PaymentWebhookResult> HandleWebhookAsync(PaymentWebhookRequest request)
+    {
+        var body = request.Body ?? string.Empty;
+
+        var payload = new TransactionStatusChangePayload
+        {
+            Payload = body,
+            QueryParameters = new Dictionary<string, Microsoft.Extensions.Primitives.StringValues>(),
+        };
+
+        var response = await TransactionStatusChange(payload);
+
+        if (response.PaymentStatus == PaymentStatusEnum.Rejected)
+        {
+            var msg = response.ResponseObject?.ToString() ?? string.Empty;
+            if (msg.Contains("signature", StringComparison.OrdinalIgnoreCase) ||
+                msg.Contains("hash", StringComparison.OrdinalIgnoreCase) ||
+                msg.Contains("sign", StringComparison.OrdinalIgnoreCase) ||
+                msg.Contains("hmac", StringComparison.OrdinalIgnoreCase))
+                return PaymentWebhookResult.Fail(msg);
+        }
+
+        if (response.PaymentStatus == PaymentStatusEnum.Processing && string.IsNullOrEmpty(response.PaymentUniqueId))
+            return PaymentWebhookResult.Ignore("Non-actionable event");
+
+        return PaymentWebhookResult.Ok(response);
+    }
+
+    /// <inheritdoc/>
+    public async Task<PaymentResponse> TransactionStatusChange(TransactionStatusChangePayload payload)
+    {
+        var body = payload.Payload?.ToString() ?? string.Empty;
+        if (!caller.VerifyNotification(body))
+            return new PaymentResponse { PaymentStatus = PaymentStatusEnum.Rejected, ResponseObject = "Invalid signature" };
+
+        try
+        {
+            var doc = JsonDocument.Parse(body);
+            var root = doc.RootElement;
+
+            if (!root.TryGetProperty("sessionId", out var sid) ||
+                !root.TryGetProperty("amount", out var amt) ||
+                !root.TryGetProperty("currency", out var cur) ||
+                !root.TryGetProperty("orderId", out var oid))
+                return new PaymentResponse { PaymentStatus = PaymentStatusEnum.Rejected, ResponseObject = "Missing fields" };
+
+            var status = await caller.VerifyTransactionAsync(
+                sid.GetString()!,
+                amt.GetInt64(),
+                cur.GetString()!,
+                oid.GetInt32());
+
+            return new PaymentResponse { PaymentStatus = status, ResponseObject = "OK" };
+        }
+        catch
+        {
+            return new PaymentResponse { PaymentStatus = PaymentStatusEnum.Rejected, ResponseObject = "Parse error" };
+        }
+    }
+}
+
+// ─── DI ───────────────────────────────────────────────────────────────────────
+
+/// <summary>Rozszerzenia DI dla Przelewy24.</summary>
+public static class Przelewy24ProviderExtensions
+{
+    /// <summary>Rejestruje provider i jego zależności w kontenerze DI.</summary>
+    public static void RegisterPrzelewy24Provider(this IServiceCollection services)
+    {
+        services.AddOptions<Przelewy24ServiceOptions>();
+        services.ConfigureOptions<Przelewy24ConfigureOptions>();
+        services.AddHttpClient("Przelewy24");
+        services.AddTransient<IPrzelewy24ServiceCaller, Przelewy24ServiceCaller>();
+        services.AddTransient<Przelewy24Provider>();
+        services.AddTransient<IWebhookPaymentProvider>(sp => sp.GetRequiredService<Przelewy24Provider>());
+    }
+}
+
+/// <summary>Wczytuje opcje Przelewy24 z konfiguracji.</summary>
+public class Przelewy24ConfigureOptions : IConfigureOptions<Przelewy24ServiceOptions>
+{
+    private readonly IConfiguration configuration;
+    /// <summary>Inicjalizuje instancję konfiguracji.</summary>
+    public Przelewy24ConfigureOptions(IConfiguration configuration) => this.configuration = configuration;
+    /// <inheritdoc/>
+    public void Configure(Przelewy24ServiceOptions options)
+    {
+        var s = configuration.GetSection(Przelewy24ServiceOptions.ConfigurationKey).Get<Przelewy24ServiceOptions>();
+        if (s is null) return;
+        options.MerchantId = s.MerchantId;
+        options.PosId = s.PosId;
+        options.ApiKey = s.ApiKey;
+        options.CrcKey = s.CrcKey;
+        options.ServiceUrl = s.ServiceUrl;
+        options.ReturnUrl = s.ReturnUrl;
+        options.NotifyUrl = s.NotifyUrl;
+    }
+}
diff --git a/src/TailoredApps.Shared.Payments.Provider.Revolut/RevolutProvider.cs b/src/TailoredApps.Shared.Payments.Provider.Revolut/RevolutProvider.cs
index 7b3e946..bbe2f2a 100644
--- a/src/TailoredApps.Shared.Payments.Provider.Revolut/RevolutProvider.cs
+++ b/src/TailoredApps.Shared.Payments.Provider.Revolut/RevolutProvider.cs
@@ -1,278 +1,280 @@
-using System.Net.Http;
-using System.Net.Http.Headers;
-using System.Security.Cryptography;
-using System.Text;
-using System.Text.Json;
-using System.Text.Json.Serialization;
-using Microsoft.Extensions.Configuration;
-using Microsoft.Extensions.DependencyInjection;
-using Microsoft.Extensions.Options;
-
-namespace TailoredApps.Shared.Payments.Provider.Revolut;
-
-/// <summary>Konfiguracja Revolut. Sekcja: <c>Payments:Providers:Revolut</c>.</summary>
-public class RevolutServiceOptions
-{
-    /// <summary>Klucz sekcji konfiguracji.</summary>
-    public static string ConfigurationKey => "Payments:Providers:Revolut";
-    /// <summary>ApiKey.</summary>
-    public string ApiKey        { get; set; } = string.Empty;
-    /// <summary>ApiUrl.</summary>
-    public string ApiUrl        { get; set; } = "https://merchant.revolut.com/api";
-    /// <summary>ReturnUrl.</summary>
-    public string ReturnUrl     { get; set; } = string.Empty;
-    /// <summary>WebhookSecret.</summary>
-    public string WebhookSecret { get; set; } = string.Empty;
-}
-
-file class RevolutOrderRequest
-{
-    [JsonPropertyName("amount")]                   public long    Amount      { get; set; }
-    [JsonPropertyName("currency")]                 public string  Currency    { get; set; } = string.Empty;
-    [JsonPropertyName("description")]              public string? Description { get; set; }
-    [JsonPropertyName("merchant_order_ext_ref")]   public string? ExternalRef { get; set; }
-    [JsonPropertyName("email")]                    public string? Email       { get; set; }
-}
-
-file class RevolutOrderResponse
-{
-    [JsonPropertyName("id")]           public string? Id          { get; set; }
-    [JsonPropertyName("checkout_url")] public string? CheckoutUrl { get; set; }
-    [JsonPropertyName("state")]        public string? State       { get; set; }
-}
-
-/// <summary>Abstrakcja nad Revolut Merchant API.</summary>
-public interface IRevolutServiceCaller
-{
-    /// <summary>Wywołanie API.</summary>
-    Task<(string? id, string? checkoutUrl)> CreateOrderAsync(PaymentRequest request);
-    /// <summary>Wywołanie API.</summary>
-    Task<(string? state, string? id)> GetOrderAsync(string orderId);
-    /// <summary>Weryfikuje podpis powiadomienia.</summary>
-    bool VerifyWebhookSignature(string payload, string timestamp, string signature);
-}
-
-/// <summary>Implementacja <see cref="IRevolutServiceCaller"/>.</summary>
-public class RevolutServiceCaller : IRevolutServiceCaller
-{
-    private readonly RevolutServiceOptions options;
-    private readonly IHttpClientFactory httpClientFactory;
-
-    /// <summary>Inicjalizuje instancję callera.</summary>
-    public RevolutServiceCaller(IOptions<RevolutServiceOptions> options, IHttpClientFactory httpClientFactory)
-    {
-        this.options = options.Value;
-        this.httpClientFactory = httpClientFactory;
-    }
-
-    private HttpClient CreateClient()
-    {
-        var client = httpClientFactory.CreateClient("Revolut");
-        client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", options.ApiKey);
-        client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
-        return client;
-    }
-
-    /// <inheritdoc/>
-    public async Task<(string? id, string? checkoutUrl)> CreateOrderAsync(PaymentRequest request)
-    {
-        using var client = CreateClient();
-        var body = new RevolutOrderRequest
-        {
-            Amount      = (long)(request.Amount * 100),
-            Currency    = request.Currency.ToUpperInvariant(),
-            Description = request.Title ?? request.Description,
-            ExternalRef = request.AdditionalData ?? Guid.NewGuid().ToString("N"),
-            Email       = request.Email,
-        };
-        var content  = new StringContent(JsonSerializer.Serialize(body), Encoding.UTF8, "application/json");
-        var response = await client.PostAsync($"{options.ApiUrl}/1.0/orders", content);
-        var json     = await response.Content.ReadAsStringAsync();
-        var result   = JsonSerializer.Deserialize<RevolutOrderResponse>(json);
-        return (result?.Id, result?.CheckoutUrl);
-    }
-
-    /// <inheritdoc/>
-    public async Task<(string? state, string? id)> GetOrderAsync(string orderId)
-    {
-        using var client = CreateClient();
-        var response = await client.GetAsync($"{options.ApiUrl}/1.0/orders/{orderId}");
-        if (!response.IsSuccessStatusCode) return (null, orderId);
-        var json   = await response.Content.ReadAsStringAsync();
-        var result = JsonSerializer.Deserialize<RevolutOrderResponse>(json);
-        return (result?.State, result?.Id);
-    }
-
-    /// <summary>
-    /// Weryfikuje podpis webhooka Revolut.
-    /// Format: HMAC-SHA256("v1:{timestamp}.{payload}", webhookSecret).
-    /// Nagłówek Revolut-Signature: v1=&lt;hex&gt;
-    /// </summary>
-    public bool VerifyWebhookSignature(string payload, string timestamp, string signature)
-    {
-        var signedPayload = $"v1:{timestamp}.{payload}";
-        var keyBytes      = Encoding.UTF8.GetBytes(options.WebhookSecret);
-        var dataBytes     = Encoding.UTF8.GetBytes(signedPayload);
-        var computed      = Convert.ToHexString(HMACSHA256.HashData(keyBytes, dataBytes)).ToLowerInvariant();
-        var receivedHex   = signature.StartsWith("v1=") ? signature.Substring(3) : signature;
-        return string.Equals(computed, receivedHex, StringComparison.OrdinalIgnoreCase);
-    }
-}
-
-/// <summary>Implementacja <see cref="IPaymentProvider"/> dla Revolut.</summary>
-public class RevolutProvider : IPaymentProvider, IWebhookPaymentProvider
-{
-    private readonly IRevolutServiceCaller caller;
-
-    /// <summary>Inicjalizuje instancję providera.</summary>
-    public RevolutProvider(IRevolutServiceCaller caller) => this.caller = caller;
-
-    public string Key         => "Revolut";
-    public string Name        => "Revolut";
-    /// <inheritdoc/>
-    public string Description => "Globalny operator płatności Revolut — karty, Revolut Pay.";
-    public string Url         => "https://revolut.com/business";
-
-    /// <inheritdoc/>
-    public Task<ICollection<PaymentChannel>> GetPaymentChannels(string currency)
-    {
-        ICollection<PaymentChannel> channels =
-        [
-            new PaymentChannel { Id = "card",        Name = "Karta płatnicza", Description = "Visa, Mastercard, Amex", PaymentModel = PaymentModel.OneTime },
-            new PaymentChannel { Id = "revolut_pay", Name = "Revolut Pay",     Description = "Płatność Revolut Pay",   PaymentModel = PaymentModel.OneTime },
-        ];
-        return Task.FromResult(channels);
-    }
-
-    /// <inheritdoc/>
-    public async Task<PaymentResponse> RequestPayment(PaymentRequest request)
-    {
-        var (id, checkoutUrl) = await caller.CreateOrderAsync(request);
-        if (id is null)
-            return new PaymentResponse { PaymentStatus = PaymentStatusEnum.Rejected, ResponseObject = "API error" };
-        return new PaymentResponse
-        {
-            PaymentUniqueId = id,
-            RedirectUrl     = checkoutUrl,
-            PaymentStatus   = PaymentStatusEnum.Created,
-        };
-    }
-
-    /// <inheritdoc/>
-    public async Task<PaymentResponse> GetStatus(string paymentId)
-    {
-        var (state, _) = await caller.GetOrderAsync(paymentId);
-        var status = state switch
-        {
-            "completed"  => PaymentStatusEnum.Finished,
-            "processing" => PaymentStatusEnum.Processing,
-            "pending"    => PaymentStatusEnum.Processing,
-            "authorised" => PaymentStatusEnum.Processing,
-            "failed"     => PaymentStatusEnum.Rejected,
-            "cancelled"  => PaymentStatusEnum.Rejected,
-            _            => PaymentStatusEnum.Created,
-        };
-        return new PaymentResponse { PaymentUniqueId = paymentId, PaymentStatus = status };
-    }
-
-    // ─── IWebhookPaymentProvider ─────────────────────────────────────────────
-
-    /// <inheritdoc/>
-    public async Task<PaymentWebhookResult> HandleWebhookAsync(PaymentWebhookRequest request)
-    {
-        var body      = request.Body ?? string.Empty;
-        var timestamp = request.Headers.TryGetValue("Revolut-Request-Timestamp", out var t) ? t.ToString() : string.Empty;
-        var signature = request.Headers.TryGetValue("Revolut-Signature",         out var s) ? s.ToString() : string.Empty;
-
-        var payload = new TransactionStatusChangePayload
-        {
-            Payload         = body,
-            QueryParameters = new Dictionary<string, Microsoft.Extensions.Primitives.StringValues>
-            {
-                { "Revolut-Request-Timestamp", timestamp },
-                { "Revolut-Signature",         signature },
-            },
-        };
-
-        var response = await TransactionStatusChange(payload);
-
-        if (response.PaymentStatus == PaymentStatusEnum.Rejected)
-        {
-            var msg = response.ResponseObject?.ToString() ?? string.Empty;
-            if (msg.Contains("signature", StringComparison.OrdinalIgnoreCase) ||
-                msg.Contains("hash",      StringComparison.OrdinalIgnoreCase) ||
-                msg.Contains("sign",      StringComparison.OrdinalIgnoreCase) ||
-                msg.Contains("hmac",      StringComparison.OrdinalIgnoreCase))
-                return PaymentWebhookResult.Fail(msg);
-        }
-
-        if (response.PaymentStatus == PaymentStatusEnum.Processing && string.IsNullOrEmpty(response.PaymentUniqueId))
-            return PaymentWebhookResult.Ignore("Non-actionable event");
-
-        return PaymentWebhookResult.Ok(response);
-    }
-
-    /// <inheritdoc/>
-    public Task<PaymentResponse> TransactionStatusChange(TransactionStatusChangePayload payload)
-    {
-        var body      = payload.Payload?.ToString() ?? string.Empty;
-        var timestamp = payload.QueryParameters.TryGetValue("Revolut-Request-Timestamp", out var t) ? t.ToString() : string.Empty;
-        var signature = payload.QueryParameters.TryGetValue("Revolut-Signature", out var s) ? s.ToString() : string.Empty;
-
-        if (!caller.VerifyWebhookSignature(body, timestamp, signature))
-            return Task.FromResult(new PaymentResponse { PaymentStatus = PaymentStatusEnum.Rejected, ResponseObject = "Invalid signature" });
-
-        var status = PaymentStatusEnum.Processing;
-        try
-        {
-            var doc = JsonDocument.Parse(body);
-            if (doc.RootElement.TryGetProperty("event", out var ev))
-                status = ev.GetString() switch
-                {
-                    "ORDER_COMPLETED"         => PaymentStatusEnum.Finished,
-                    "ORDER_AUTHORISED"        => PaymentStatusEnum.Processing,
-                    "ORDER_CANCELLED"         => PaymentStatusEnum.Rejected,
-                    "ORDER_PAYMENT_DECLINED"  => PaymentStatusEnum.Rejected,
-                    "PAYMENT_DECLINED"        => PaymentStatusEnum.Rejected,
-                    _                         => PaymentStatusEnum.Processing,
-                };
-        }
-        catch { /* ignore */ }
-
-        return Task.FromResult(new PaymentResponse { PaymentStatus = status, ResponseObject = "OK" });
-    }
-}
-
-/// <summary>Rozszerzenia DI dla Revolut.</summary>
-public static class RevolutProviderExtensions
-{
-    /// <summary>Rejestruje provider i jego zależności w kontenerze DI.</summary>
-    public static void RegisterRevolutProvider(this IServiceCollection services)
-    {
-        services.AddOptions<RevolutServiceOptions>();
-        services.ConfigureOptions<RevolutConfigureOptions>();
-        services.AddHttpClient("Revolut");
-        services.AddTransient<IRevolutServiceCaller, RevolutServiceCaller>();
-        services.AddTransient<RevolutProvider>();
-        services.AddTransient<IPaymentProvider>(sp => sp.GetRequiredService<RevolutProvider>());
-        services.AddTransient<IWebhookPaymentProvider>(sp => sp.GetRequiredService<RevolutProvider>());
-    }
-}
-
-/// <summary>Wczytuje opcje Revolut z konfiguracji.</summary>
-public class RevolutConfigureOptions : IConfigureOptions<RevolutServiceOptions>
-{
-    private readonly IConfiguration configuration;
-    /// <summary>Inicjalizuje instancję konfiguracji.</summary>
-    public RevolutConfigureOptions(IConfiguration configuration) => this.configuration = configuration;
-    /// <inheritdoc/>
-    public void Configure(RevolutServiceOptions options)
-    {
-        var s = configuration.GetSection(RevolutServiceOptions.ConfigurationKey).Get<RevolutServiceOptions>();
-        if (s is null) return;
-        options.ApiKey        = s.ApiKey;
-        options.ApiUrl        = s.ApiUrl;
-        options.ReturnUrl     = s.ReturnUrl;
-        options.WebhookSecret = s.WebhookSecret;
-    }
-}
+using System.Net.Http;
+using System.Net.Http.Headers;
+using System.Security.Cryptography;
+using System.Text;
+using System.Text.Json;
+using System.Text.Json.Serialization;
+using Microsoft.Extensions.Configuration;
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Options;
+
+namespace TailoredApps.Shared.Payments.Provider.Revolut;
+
+/// <summary>Konfiguracja Revolut. Sekcja: <c>Payments:Providers:Revolut</c>.</summary>
+public class RevolutServiceOptions
+{
+    /// <summary>Klucz sekcji konfiguracji.</summary>
+    public static string ConfigurationKey => "Payments:Providers:Revolut";
+    /// <summary>ApiKey.</summary>
+    public string ApiKey { get; set; } = string.Empty;
+    /// <summary>ApiUrl.</summary>
+    public string ApiUrl { get; set; } = "https://merchant.revolut.com/api";
+    /// <summary>ReturnUrl.</summary>
+    public string ReturnUrl { get; set; } = string.Empty;
+    /// <summary>WebhookSecret.</summary>
+    public string WebhookSecret { get; set; } = string.Empty;
+}
+
+file class RevolutOrderRequest
+{
+    [JsonPropertyName("amount")] public long Amount { get; set; }
+    [JsonPropertyName("currency")] public string Currency { get; set; } = string.Empty;
+    [JsonPropertyName("description")] public string? Description { get; set; }
+    [JsonPropertyName("merchant_order_ext_ref")] public string? ExternalRef { get; set; }
+    [JsonPropertyName("email")] public string? Email { get; set; }
+}
+
+file class RevolutOrderResponse
+{
+    [JsonPropertyName("id")] public string? Id { get; set; }
+    [JsonPropertyName("checkout_url")] public string? CheckoutUrl { get; set; }
+    [JsonPropertyName("state")] public string? State { get; set; }
+}
+
+/// <summary>Abstrakcja nad Revolut Merchant API.</summary>
+public interface IRevolutServiceCaller
+{
+    /// <summary>Wywołanie API.</summary>
+    Task<(string? id, string? checkoutUrl)> CreateOrderAsync(PaymentRequest request);
+    /// <summary>Wywołanie API.</summary>
+    Task<(string? state, string? id)> GetOrderAsync(string orderId);
+    /// <summary>Weryfikuje podpis powiadomienia.</summary>
+    bool VerifyWebhookSignature(string payload, string timestamp, string signature);
+}
+
+/// <summary>Implementacja <see cref="IRevolutServiceCaller"/>.</summary>
+public class RevolutServiceCaller : IRevolutServiceCaller
+{
+    private readonly RevolutServiceOptions options;
+    private readonly IHttpClientFactory httpClientFactory;
+
+    /// <summary>Inicjalizuje instancję callera.</summary>
+    public RevolutServiceCaller(IOptions<RevolutServiceOptions> options, IHttpClientFactory httpClientFactory)
+    {
+        this.options = options.Value;
+        this.httpClientFactory = httpClientFactory;
+    }
+
+    private HttpClient CreateClient()
+    {
+        var client = httpClientFactory.CreateClient("Revolut");
+        client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", options.ApiKey);
+        client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
+        return client;
+    }
+
+    /// <inheritdoc/>
+    public async Task<(string? id, string? checkoutUrl)> CreateOrderAsync(PaymentRequest request)
+    {
+        using var client = CreateClient();
+        var body = new RevolutOrderRequest
+        {
+            Amount = (long)(request.Amount * 100),
+            Currency = request.Currency.ToUpperInvariant(),
+            Description = request.Title ?? request.Description,
+            ExternalRef = request.AdditionalData ?? Guid.NewGuid().ToString("N"),
+            Email = request.Email,
+        };
+        var content = new StringContent(JsonSerializer.Serialize(body), Encoding.UTF8, "application/json");
+        var response = await client.PostAsync($"{options.ApiUrl}/1.0/orders", content);
+        var json = await response.Content.ReadAsStringAsync();
+        var result = JsonSerializer.Deserialize<RevolutOrderResponse>(json);
+        return (result?.Id, result?.CheckoutUrl);
+    }
+
+    /// <inheritdoc/>
+    public async Task<(string? state, string? id)> GetOrderAsync(string orderId)
+    {
+        using var client = CreateClient();
+        var response = await client.GetAsync($"{options.ApiUrl}/1.0/orders/{orderId}");
+        if (!response.IsSuccessStatusCode) return (null, orderId);
+        var json = await response.Content.ReadAsStringAsync();
+        var result = JsonSerializer.Deserialize<RevolutOrderResponse>(json);
+        return (result?.State, result?.Id);
+    }
+
+    /// <summary>
+    /// Weryfikuje podpis webhooka Revolut.
+    /// Format: HMAC-SHA256("v1:{timestamp}.{payload}", webhookSecret).
+    /// Nagłówek Revolut-Signature: v1=&lt;hex&gt;
+    /// </summary>
+    public bool VerifyWebhookSignature(string payload, string timestamp, string signature)
+    {
+        var signedPayload = $"v1:{timestamp}.{payload}";
+        var keyBytes = Encoding.UTF8.GetBytes(options.WebhookSecret);
+        var dataBytes = Encoding.UTF8.GetBytes(signedPayload);
+        var computed = Convert.ToHexString(HMACSHA256.HashData(keyBytes, dataBytes)).ToLowerInvariant();
+        var receivedHex = signature.StartsWith("v1=") ? signature.Substring(3) : signature;
+        return string.Equals(computed, receivedHex, StringComparison.OrdinalIgnoreCase);
+    }
+}
+
+/// <summary>Implementacja <see cref="IPaymentProvider"/> dla Revolut.</summary>
+public class RevolutProvider : IPaymentProvider, IWebhookPaymentProvider
+{
+    private readonly IRevolutServiceCaller caller;
+
+    /// <summary>Inicjalizuje instancję providera.</summary>
+    public RevolutProvider(IRevolutServiceCaller caller) => this.caller = caller;
+
+    /// <inheritdoc/>
+    public string Key => "Revolut";
+    /// <inheritdoc/>
+    public string Name => "Revolut";
+    /// <inheritdoc/>
+    public string Description => "Globalny operator płatności Revolut — karty, Revolut Pay.";
+    /// <inheritdoc/>
+    public string Url => "https://revolut.com/business";
+
+    /// <inheritdoc/>
+    public Task<ICollection<PaymentChannel>> GetPaymentChannels(string currency)
+    {
+        ICollection<PaymentChannel> channels =
+        [
+            new PaymentChannel { Id = "card",        Name = "Karta płatnicza", Description = "Visa, Mastercard, Amex", PaymentModel = PaymentModel.OneTime },
+            new PaymentChannel { Id = "revolut_pay", Name = "Revolut Pay",     Description = "Płatność Revolut Pay",   PaymentModel = PaymentModel.OneTime },
+        ];
+        return Task.FromResult(channels);
+    }
+
+    /// <inheritdoc/>
+    public async Task<PaymentResponse> RequestPayment(PaymentRequest request)
+    {
+        var (id, checkoutUrl) = await caller.CreateOrderAsync(request);
+        if (id is null)
+            return new PaymentResponse { PaymentStatus = PaymentStatusEnum.Rejected, ResponseObject = "API error" };
+        return new PaymentResponse
+        {
+            PaymentUniqueId = id,
+            RedirectUrl = checkoutUrl,
+            PaymentStatus = PaymentStatusEnum.Created,
+        };
+    }
+
+    /// <inheritdoc/>
+    public async Task<PaymentResponse> GetStatus(string paymentId)
+    {
+        var (state, _) = await caller.GetOrderAsync(paymentId);
+        var status = state switch
+        {
+            "completed" => PaymentStatusEnum.Finished,
+            "processing" => PaymentStatusEnum.Processing,
+            "pending" => PaymentStatusEnum.Processing,
+            "authorised" => PaymentStatusEnum.Processing,
+            "failed" => PaymentStatusEnum.Rejected,
+            "cancelled" => PaymentStatusEnum.Rejected,
+            _ => PaymentStatusEnum.Created,
+        };
+        return new PaymentResponse { PaymentUniqueId = paymentId, PaymentStatus = status };
+    }
+
+    // ─── IWebhookPaymentProvider ─────────────────────────────────────────────
+
+    /// <inheritdoc/>
+    public async Task<PaymentWebhookResult> HandleWebhookAsync(PaymentWebhookRequest request)
+    {
+        var body = request.Body ?? string.Empty;
+        var timestamp = request.Headers.TryGetValue("Revolut-Request-Timestamp", out var t) ? t.ToString() : string.Empty;
+        var signature = request.Headers.TryGetValue("Revolut-Signature", out var s) ? s.ToString() : string.Empty;
+
+        var payload = new TransactionStatusChangePayload
+        {
+            Payload = body,
+            QueryParameters = new Dictionary<string, Microsoft.Extensions.Primitives.StringValues>
+            {
+                { "Revolut-Request-Timestamp", timestamp },
+                { "Revolut-Signature",         signature },
+            },
+        };
+
+        var response = await TransactionStatusChange(payload);
+
+        if (response.PaymentStatus == PaymentStatusEnum.Rejected)
+        {
+            var msg = response.ResponseObject?.ToString() ?? string.Empty;
+            if (msg.Contains("signature", StringComparison.OrdinalIgnoreCase) ||
+                msg.Contains("hash", StringComparison.OrdinalIgnoreCase) ||
+                msg.Contains("sign", StringComparison.OrdinalIgnoreCase) ||
+                msg.Contains("hmac", StringComparison.OrdinalIgnoreCase))
+                return PaymentWebhookResult.Fail(msg);
+        }
+
+        if (response.PaymentStatus == PaymentStatusEnum.Processing && string.IsNullOrEmpty(response.PaymentUniqueId))
+            return PaymentWebhookResult.Ignore("Non-actionable event");
+
+        return PaymentWebhookResult.Ok(response);
+    }
+
+    /// <inheritdoc/>
+    public Task<PaymentResponse> TransactionStatusChange(TransactionStatusChangePayload payload)
+    {
+        var body = payload.Payload?.ToString() ?? string.Empty;
+        var timestamp = payload.QueryParameters.TryGetValue("Revolut-Request-Timestamp", out var t) ? t.ToString() : string.Empty;
+        var signature = payload.QueryParameters.TryGetValue("Revolut-Signature", out var s) ? s.ToString() : string.Empty;
+
+        if (!caller.VerifyWebhookSignature(body, timestamp, signature))
+            return Task.FromResult(new PaymentResponse { PaymentStatus = PaymentStatusEnum.Rejected, ResponseObject = "Invalid signature" });
+
+        var status = PaymentStatusEnum.Processing;
+        try
+        {
+            var doc = JsonDocument.Parse(body);
+            if (doc.RootElement.TryGetProperty("event", out var ev))
+                status = ev.GetString() switch
+                {
+                    "ORDER_COMPLETED" => PaymentStatusEnum.Finished,
+                    "ORDER_AUTHORISED" => PaymentStatusEnum.Processing,
+                    "ORDER_CANCELLED" => PaymentStatusEnum.Rejected,
+                    "ORDER_PAYMENT_DECLINED" => PaymentStatusEnum.Rejected,
+                    "PAYMENT_DECLINED" => PaymentStatusEnum.Rejected,
+                    _ => PaymentStatusEnum.Processing,
+                };
+        }
+        catch { /* ignore */ }
+
+        return Task.FromResult(new PaymentResponse { PaymentStatus = status, ResponseObject = "OK" });
+    }
+}
+
+/// <summary>Rozszerzenia DI dla Revolut.</summary>
+public static class RevolutProviderExtensions
+{
+    /// <summary>Rejestruje provider i jego zależności w kontenerze DI.</summary>
+    public static void RegisterRevolutProvider(this IServiceCollection services)
+    {
+        services.AddOptions<RevolutServiceOptions>();
+        services.ConfigureOptions<RevolutConfigureOptions>();
+        services.AddHttpClient("Revolut");
+        services.AddTransient<IRevolutServiceCaller, RevolutServiceCaller>();
+        services.AddTransient<RevolutProvider>();
+        services.AddTransient<IWebhookPaymentProvider>(sp => sp.GetRequiredService<RevolutProvider>());
+    }
+}
+
+/// <summary>Wczytuje opcje Revolut z konfiguracji.</summary>
+public class RevolutConfigureOptions : IConfigureOptions<RevolutServiceOptions>
+{
+    private readonly IConfiguration configuration;
+    /// <summary>Inicjalizuje instancję konfiguracji.</summary>
+    public RevolutConfigureOptions(IConfiguration configuration) => this.configuration = configuration;
+    /// <inheritdoc/>
+    public void Configure(RevolutServiceOptions options)
+    {
+        var s = configuration.GetSection(RevolutServiceOptions.ConfigurationKey).Get<RevolutServiceOptions>();
+        if (s is null) return;
+        options.ApiKey = s.ApiKey;
+        options.ApiUrl = s.ApiUrl;
+        options.ReturnUrl = s.ReturnUrl;
+        options.WebhookSecret = s.WebhookSecret;
+    }
+}
diff --git a/src/TailoredApps.Shared.Payments.Provider.Stripe/IStripeServiceCaller.cs b/src/TailoredApps.Shared.Payments.Provider.Stripe/IStripeServiceCaller.cs
index f34e51f..318782a 100644
--- a/src/TailoredApps.Shared.Payments.Provider.Stripe/IStripeServiceCaller.cs
+++ b/src/TailoredApps.Shared.Payments.Provider.Stripe/IStripeServiceCaller.cs
@@ -1,22 +1,22 @@
-using global::Stripe;
-using global::Stripe.Checkout;
-
-namespace TailoredApps.Shared.Payments.Provider.Stripe;
-
-/// <summary>
-/// Abstrakcja nad Stripe SDK — ułatwia mockowanie w testach.
-/// </summary>
-public interface IStripeServiceCaller
-{
-    /// <summary>Tworzy Stripe Checkout Session i zwraca jej dane.</summary>
-    Task<Session> CreateCheckoutSessionAsync(Payments.PaymentRequest request);
-
-    /// <summary>Pobiera Checkout Session po ID (rozszerzony o PaymentIntent).</summary>
-    Task<Session> GetCheckoutSessionAsync(string sessionId);
-
-    /// <summary>
-    /// Weryfikuje podpis webhooka i zwraca sparsowane zdarzenie Stripe.
-    /// Rzuca <see cref="StripeException"/> gdy podpis jest nieprawidłowy.
-    /// </summary>
-    Event ConstructWebhookEvent(string payload, string stripeSignature);
-}
+using global::Stripe;
+using global::Stripe.Checkout;
+
+namespace TailoredApps.Shared.Payments.Provider.Stripe;
+
+/// <summary>
+/// Abstrakcja nad Stripe SDK — ułatwia mockowanie w testach.
+/// </summary>
+public interface IStripeServiceCaller
+{
+    /// <summary>Tworzy Stripe Checkout Session i zwraca jej dane.</summary>
+    Task<Session> CreateCheckoutSessionAsync(Payments.PaymentRequest request);
+
+    /// <summary>Pobiera Checkout Session po ID (rozszerzony o PaymentIntent).</summary>
+    Task<Session> GetCheckoutSessionAsync(string sessionId);
+
+    /// <summary>
+    /// Weryfikuje podpis webhooka i zwraca sparsowane zdarzenie Stripe.
+    /// Rzuca <see cref="StripeException"/> gdy podpis jest nieprawidłowy.
+    /// </summary>
+    Event ConstructWebhookEvent(string payload, string stripeSignature);
+}
diff --git a/src/TailoredApps.Shared.Payments.Provider.Stripe/StripeProvider.cs b/src/TailoredApps.Shared.Payments.Provider.Stripe/StripeProvider.cs
index 8da1f16..cb42de1 100644
--- a/src/TailoredApps.Shared.Payments.Provider.Stripe/StripeProvider.cs
+++ b/src/TailoredApps.Shared.Payments.Provider.Stripe/StripeProvider.cs
@@ -1,288 +1,290 @@
-using global::Stripe;
-using Microsoft.Extensions.Configuration;
-using Microsoft.Extensions.DependencyInjection;
-using Microsoft.Extensions.Options;
-using System;
-using System.Collections.Generic;
-using TailoredApps.Shared.Payments;
-
-namespace TailoredApps.Shared.Payments.Provider.Stripe;
-
-/// <summary>
-/// Implementacja <see cref="IPaymentProvider"/> dla Stripe Checkout.
-/// Przepływ: RequestPayment → Stripe Checkout Session (hosted page) → webhook StatusChange.
-/// </summary>
-public class StripeProvider : IPaymentProvider, IWebhookPaymentProvider
-{
-    private readonly IStripeServiceCaller stripeCaller;
-
-    /// <summary>Inicjalizuje instancję providera.</summary>
-    public StripeProvider(IStripeServiceCaller stripeCaller)
-    {
-        this.stripeCaller = stripeCaller;
-    }
-
-    private static readonly string StripeProviderKey = "Stripe";
-
-    public string Key         => StripeProviderKey;
-    public string Name        => StripeProviderKey;
-    /// <inheritdoc/>
-    public string Description => "Globalny operator płatności kartą, BLIK i Przelewy24.";
-    public string Url         => "https://stripe.com";
-
-    /// <inheritdoc/>
-    /// <remarks>
-    /// Stripe nie udostępnia REST API do listy kanałów per waluta w modelu CashBill.
-    /// Zwracamy statyczną listę bazując na walucie — identyczną z tą, którą StripeServiceCaller
-    /// przekazuje do Checkout Session. Dzięki temu UI może wyświetlić dostępne opcje.
-    /// </remarks>
-    public Task<ICollection<PaymentChannel>> GetPaymentChannels(string currency)
-    {
-        ICollection<PaymentChannel> channels = currency.ToUpperInvariant() switch
-        {
-            "PLN" =>
-            [
-                new PaymentChannel { Id = "card", Name = "Karta płatnicza",  Description = "Visa, Mastercard, American Express", PaymentModel = PaymentModel.OneTime },
-                new PaymentChannel { Id = "blik", Name = "BLIK",             Description = "Szybka płatność kodem BLIK",         PaymentModel = PaymentModel.OneTime },
-                new PaymentChannel { Id = "p24",  Name = "Przelewy24",       Description = "Szybki przelew bankowy",             PaymentModel = PaymentModel.OneTime },
-            ],
-            "EUR" =>
-            [
-                new PaymentChannel { Id = "card",       Name = "Karta płatnicza", Description = "Visa, Mastercard, American Express", PaymentModel = PaymentModel.OneTime },
-                new PaymentChannel { Id = "sepa_debit", Name = "SEPA Direct Debit", Description = "Polecenie zapłaty SEPA",           PaymentModel = PaymentModel.OneTime },
-            ],
-            _ =>
-            [
-                new PaymentChannel { Id = "card", Name = "Karta płatnicza", Description = "Visa, Mastercard, American Express", PaymentModel = PaymentModel.OneTime },
-            ],
-        };
-
-        return Task.FromResult(channels);
-    }
-
-    /// <inheritdoc/>
-    /// <remarks>
-    /// Tworzy Stripe Checkout Session. Zwraca URL do hosted page Stripe oraz ID sesji.
-    /// </remarks>
-    public async Task<PaymentResponse> RequestPayment(PaymentRequest request)
-    {
-        var session = await stripeCaller.CreateCheckoutSessionAsync(request);
-
-        return new PaymentResponse
-        {
-            PaymentUniqueId = session.Id,
-            RedirectUrl     = session.Url,
-            PaymentStatus   = PaymentStatusEnum.Created,
-        };
-    }
-
-    /// <inheritdoc/>
-    /// <remarks>
-    /// Pobiera aktualny status Checkout Session. ID = Stripe Session ID (cs_...).
-    /// </remarks>
-    public async Task<PaymentResponse> GetStatus(string paymentId)
-    {
-        var session = await stripeCaller.GetCheckoutSessionAsync(paymentId);
-
-        return new PaymentResponse
-        {
-            PaymentUniqueId = session.Id,
-            RedirectUrl     = session.Url,
-            PaymentStatus   = MapSessionStatus(session),
-        };
-    }
-
-    /// <inheritdoc/>
-    /// <remarks>
-    /// Obsługuje webhook Stripe. Oczekuje:
-    /// <list type="bullet">
-    ///   <item><c>payload.Payload</c> — surowe body HTTP (string JSON).</item>
-    ///   <item><c>payload.QueryParameters["Stripe-Signature"]</c> — wartość nagłówka Stripe-Signature.</item>
-    /// </list>
-    /// Weryfikuje podpis HMAC-SHA256 i przetwarza zdarzenia:
-    /// checkout.session.completed, checkout.session.expired.
-    /// </remarks>
-    public Task<PaymentResponse> TransactionStatusChange(TransactionStatusChangePayload payload)
-    {
-        var rawBody       = payload.Payload?.ToString() ?? string.Empty;
-        var stripeSignature = payload.QueryParameters.TryGetValue("Stripe-Signature", out var sig)
-            ? sig.ToString()
-            : string.Empty;
-
-        Event stripeEvent;
-        try
-        {
-            stripeEvent = stripeCaller.ConstructWebhookEvent(rawBody, stripeSignature);
-        }
-        catch (StripeException ex)
-        {
-            // Nieprawidłowy podpis — zwracamy Rejected i nie przetwarzamy zdarzenia.
-            return Task.FromResult(new PaymentResponse
-            {
-                PaymentStatus   = PaymentStatusEnum.Rejected,
-                ResponseObject  = $"Webhook signature verification failed: {ex.Message}",
-            });
-        }
-
-        var response = stripeEvent.Type switch
-        {
-            "checkout.session.completed" =>
-                HandleSessionCompleted(stripeEvent),
-            "checkout.session.expired" =>
-                new PaymentResponse
-                {
-                    PaymentStatus  = PaymentStatusEnum.Rejected,
-                    ResponseObject = "OK",
-                },
-            "payment_intent.succeeded" =>
-                new PaymentResponse
-                {
-                    PaymentStatus  = PaymentStatusEnum.Finished,
-                    ResponseObject = "OK",
-                },
-            "payment_intent.payment_failed" =>
-                new PaymentResponse
-                {
-                    PaymentStatus  = PaymentStatusEnum.Rejected,
-                    ResponseObject = "OK",
-                },
-            _ => new PaymentResponse
-            {
-                PaymentStatus  = PaymentStatusEnum.Processing,
-                ResponseObject = "OK",
-            },
-        };
-
-        return Task.FromResult(response);
-    }
-
-    // ─── IWebhookPaymentProvider ─────────────────────────────────────────────
-
-    /// <summary>
-    /// Handles an incoming Stripe webhook HTTP request.
-    /// Extracts the <c>Stripe-Signature</c> header, verifies the HMAC-SHA256 signature,
-    /// parses the event type and returns a normalised <see cref="PaymentWebhookResult"/>.
-    /// </summary>
-    /// <remarks>
-    /// Events that do not represent a terminal payment state
-    /// (e.g. <c>payment_method.attached</c>) result in <see cref="PaymentWebhookResult.Ignore"/>.
-    /// </remarks>
-    /// <param name="request">Unified HTTP webhook request.</param>
-    public Task<PaymentWebhookResult> HandleWebhookAsync(PaymentWebhookRequest request)
-    {
-        var rawBody   = request.Body ?? string.Empty;
-        var signature = request.Headers.TryGetValue("Stripe-Signature", out var sig)
-            ? sig.ToString()
-            : string.Empty;
-
-        var payload = new TransactionStatusChangePayload
-        {
-            Payload          = rawBody,
-            QueryParameters  = new Dictionary<string, Microsoft.Extensions.Primitives.StringValues>
-            {
-                { "Stripe-Signature", signature },
-            },
-        };
-
-        var response = ((IPaymentProvider)this).TransactionStatusChange(payload).GetAwaiter().GetResult();
-
-        // Signature failure — TransactionStatusChange returns Rejected + message containing "signature"
-        if (response.PaymentStatus == PaymentStatusEnum.Rejected
-            && response.ResponseObject?.ToString()?.Contains("signature", StringComparison.OrdinalIgnoreCase) == true)
-        {
-            return Task.FromResult(PaymentWebhookResult.Fail(response.ResponseObject?.ToString() ?? "Invalid signature"));
-        }
-
-        // Non-actionable event (payment_method.attached, customer.created, …)
-        if (response.PaymentStatus == PaymentStatusEnum.Processing
-            || string.IsNullOrEmpty(response.PaymentUniqueId))
-        {
-            return Task.FromResult(PaymentWebhookResult.Ignore("Non-actionable Stripe event"));
-        }
-
-        return Task.FromResult(PaymentWebhookResult.Ok(response));
-    }
-
-    // ─── Helpers ────────────────────────────────────────────────────────────
-
-    private static PaymentResponse HandleSessionCompleted(Event stripeEvent)
-    {
-        var session = stripeEvent.Data.Object as global::Stripe.Checkout.Session;
-        var status  = session?.PaymentStatus == "paid"
-            ? PaymentStatusEnum.Finished
-            : PaymentStatusEnum.Processing;
-
-        return new PaymentResponse
-        {
-            PaymentUniqueId = session?.Id,
-            RedirectUrl     = session?.Url,
-            PaymentStatus   = status,
-            ResponseObject  = "OK",
-        };
-    }
-
-    private static PaymentStatusEnum MapSessionStatus(global::Stripe.Checkout.Session session) =>
-        session.Status switch
-        {
-            "complete" when session.PaymentStatus == "paid" => PaymentStatusEnum.Finished,
-            "complete"  => PaymentStatusEnum.Processing,
-            "expired"   => PaymentStatusEnum.Rejected,
-            _           => PaymentStatusEnum.Created,   // "open"
-        };
-}
-
-// ─── DI Extensions ──────────────────────────────────────────────────────────
-
-/// <summary>
-/// Rozszerzenia DI analogiczne do <c>CashBillProviderExtensions.RegisterCashbillProvider()</c>.
-/// </summary>
-public static class StripeProviderExtensions
-{
-    /// <summary>
-    /// Rejestruje wszystkie usługi wymagane przez <see cref="StripeProvider"/>:
-    /// <see cref="StripeServiceOptions"/> (konfiguracja), <see cref="IStripeServiceCaller"/>,
-    /// i Stripe.net <c>SessionService</c>.
-    /// </summary>
-    public static void RegisterStripeProvider(this IServiceCollection services)
-    {
-        services.AddOptions<StripeServiceOptions>();
-        services.ConfigureOptions<StripeConfigureOptions>();
-        services.AddTransient<global::Stripe.Checkout.SessionService>();
-        services.AddTransient<IStripeServiceCaller, StripeServiceCaller>();
-
-        // Register as both IPaymentProvider (for PaymentService aggregator)
-        // and IWebhookPaymentProvider (for webhook dispatch).
-        services.AddTransient<StripeProvider>();
-        services.AddTransient<IPaymentProvider>(sp => sp.GetRequiredService<StripeProvider>());
-        services.AddTransient<IWebhookPaymentProvider>(sp => sp.GetRequiredService<StripeProvider>());
-    }
-}
-
-/// <summary>
-/// Wczytuje opcje Stripe z sekcji <see cref="StripeServiceOptions.ConfigurationKey"/>.
-/// </summary>
-public class StripeConfigureOptions : IConfigureOptions<StripeServiceOptions>
-{
-    private readonly IConfiguration configuration;
-
-    /// <summary>Inicjalizuje instancję konfiguracji.</summary>
-    public StripeConfigureOptions(IConfiguration configuration)
-    {
-        this.configuration = configuration;
-    }
-
-    /// <inheritdoc/>
-    public void Configure(StripeServiceOptions options)
-    {
-        var section = configuration
-            .GetSection(StripeServiceOptions.ConfigurationKey)
-            .Get<StripeServiceOptions>();
-
-        if (section is null) return;
-
-        options.SecretKey     = section.SecretKey;
-        options.WebhookSecret = section.WebhookSecret;
-        options.SuccessUrl    = section.SuccessUrl;
-        options.CancelUrl     = section.CancelUrl;
-    }
-}
+using System;
+using System.Collections.Generic;
+using global::Stripe;
+using Microsoft.Extensions.Configuration;
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Options;
+using TailoredApps.Shared.Payments;
+
+namespace TailoredApps.Shared.Payments.Provider.Stripe;
+
+/// <summary>
+/// Implementacja <see cref="IPaymentProvider"/> dla Stripe Checkout.
+/// Przepływ: RequestPayment → Stripe Checkout Session (hosted page) → webhook StatusChange.
+/// </summary>
+public class StripeProvider : IPaymentProvider, IWebhookPaymentProvider
+{
+    private readonly IStripeServiceCaller stripeCaller;
+
+    /// <summary>Inicjalizuje instancję providera.</summary>
+    public StripeProvider(IStripeServiceCaller stripeCaller)
+    {
+        this.stripeCaller = stripeCaller;
+    }
+
+    private static readonly string StripeProviderKey = "Stripe";
+
+    /// <inheritdoc/>
+    public string Key => StripeProviderKey;
+    /// <inheritdoc/>
+    public string Name => StripeProviderKey;
+    /// <inheritdoc/>
+    public string Description => "Globalny operator płatności kartą, BLIK i Przelewy24.";
+    /// <inheritdoc/>
+    public string Url => "https://stripe.com";
+
+    /// <inheritdoc/>
+    /// <remarks>
+    /// Stripe nie udostępnia REST API do listy kanałów per waluta w modelu CashBill.
+    /// Zwracamy statyczną listę bazując na walucie — identyczną z tą, którą StripeServiceCaller
+    /// przekazuje do Checkout Session. Dzięki temu UI może wyświetlić dostępne opcje.
+    /// </remarks>
+    public Task<ICollection<PaymentChannel>> GetPaymentChannels(string currency)
+    {
+        ICollection<PaymentChannel> channels = currency.ToUpperInvariant() switch
+        {
+            "PLN" =>
+            [
+                new PaymentChannel { Id = "card", Name = "Karta płatnicza",  Description = "Visa, Mastercard, American Express", PaymentModel = PaymentModel.OneTime },
+                new PaymentChannel { Id = "blik", Name = "BLIK",             Description = "Szybka płatność kodem BLIK",         PaymentModel = PaymentModel.OneTime },
+                new PaymentChannel { Id = "p24",  Name = "Przelewy24",       Description = "Szybki przelew bankowy",             PaymentModel = PaymentModel.OneTime },
+            ],
+            "EUR" =>
+            [
+                new PaymentChannel { Id = "card",       Name = "Karta płatnicza", Description = "Visa, Mastercard, American Express", PaymentModel = PaymentModel.OneTime },
+                new PaymentChannel { Id = "sepa_debit", Name = "SEPA Direct Debit", Description = "Polecenie zapłaty SEPA",           PaymentModel = PaymentModel.OneTime },
+            ],
+            _ =>
+            [
+                new PaymentChannel { Id = "card", Name = "Karta płatnicza", Description = "Visa, Mastercard, American Express", PaymentModel = PaymentModel.OneTime },
+            ],
+        };
+
+        return Task.FromResult(channels);
+    }
+
+    /// <inheritdoc/>
+    /// <remarks>
+    /// Tworzy Stripe Checkout Session. Zwraca URL do hosted page Stripe oraz ID sesji.
+    /// </remarks>
+    public async Task<PaymentResponse> RequestPayment(PaymentRequest request)
+    {
+        var session = await stripeCaller.CreateCheckoutSessionAsync(request);
+
+        return new PaymentResponse
+        {
+            PaymentUniqueId = session.Id,
+            RedirectUrl = session.Url,
+            PaymentStatus = PaymentStatusEnum.Created,
+        };
+    }
+
+    /// <inheritdoc/>
+    /// <remarks>
+    /// Pobiera aktualny status Checkout Session. ID = Stripe Session ID (cs_...).
+    /// </remarks>
+    public async Task<PaymentResponse> GetStatus(string paymentId)
+    {
+        var session = await stripeCaller.GetCheckoutSessionAsync(paymentId);
+
+        return new PaymentResponse
+        {
+            PaymentUniqueId = session.Id,
+            RedirectUrl = session.Url,
+            PaymentStatus = MapSessionStatus(session),
+        };
+    }
+
+    /// <inheritdoc/>
+    /// <remarks>
+    /// Obsługuje webhook Stripe. Oczekuje:
+    /// <list type="bullet">
+    ///   <item><c>payload.Payload</c> — surowe body HTTP (string JSON).</item>
+    ///   <item><c>payload.QueryParameters["Stripe-Signature"]</c> — wartość nagłówka Stripe-Signature.</item>
+    /// </list>
+    /// Weryfikuje podpis HMAC-SHA256 i przetwarza zdarzenia:
+    /// checkout.session.completed, checkout.session.expired.
+    /// </remarks>
+    public Task<PaymentResponse> TransactionStatusChange(TransactionStatusChangePayload payload)
+    {
+        var rawBody = payload.Payload?.ToString() ?? string.Empty;
+        var stripeSignature = payload.QueryParameters.TryGetValue("Stripe-Signature", out var sig)
+            ? sig.ToString()
+            : string.Empty;
+
+        Event stripeEvent;
+        try
+        {
+            stripeEvent = stripeCaller.ConstructWebhookEvent(rawBody, stripeSignature);
+        }
+        catch (StripeException ex)
+        {
+            // Nieprawidłowy podpis — zwracamy Rejected i nie przetwarzamy zdarzenia.
+            return Task.FromResult(new PaymentResponse
+            {
+                PaymentStatus = PaymentStatusEnum.Rejected,
+                ResponseObject = $"Webhook signature verification failed: {ex.Message}",
+            });
+        }
+
+        var response = stripeEvent.Type switch
+        {
+            "checkout.session.completed" =>
+                HandleSessionCompleted(stripeEvent),
+            "checkout.session.expired" =>
+                new PaymentResponse
+                {
+                    PaymentStatus = PaymentStatusEnum.Rejected,
+                    ResponseObject = "OK",
+                },
+            "payment_intent.succeeded" =>
+                new PaymentResponse
+                {
+                    PaymentStatus = PaymentStatusEnum.Finished,
+                    ResponseObject = "OK",
+                },
+            "payment_intent.payment_failed" =>
+                new PaymentResponse
+                {
+                    PaymentStatus = PaymentStatusEnum.Rejected,
+                    ResponseObject = "OK",
+                },
+            _ => new PaymentResponse
+            {
+                PaymentStatus = PaymentStatusEnum.Processing,
+                ResponseObject = "OK",
+            },
+        };
+
+        return Task.FromResult(response);
+    }
+
+    // ─── IWebhookPaymentProvider ─────────────────────────────────────────────
+
+    /// <summary>
+    /// Handles an incoming Stripe webhook HTTP request.
+    /// Extracts the <c>Stripe-Signature</c> header, verifies the HMAC-SHA256 signature,
+    /// parses the event type and returns a normalised <see cref="PaymentWebhookResult"/>.
+    /// </summary>
+    /// <remarks>
+    /// Events that do not represent a terminal payment state
+    /// (e.g. <c>payment_method.attached</c>) result in <see cref="PaymentWebhookResult.Ignore"/>.
+    /// </remarks>
+    /// <param name="request">Unified HTTP webhook request.</param>
+    public Task<PaymentWebhookResult> HandleWebhookAsync(PaymentWebhookRequest request)
+    {
+        var rawBody = request.Body ?? string.Empty;
+        var signature = request.Headers.TryGetValue("Stripe-Signature", out var sig)
+            ? sig.ToString()
+            : string.Empty;
+
+        var payload = new TransactionStatusChangePayload
+        {
+            Payload = rawBody,
+            QueryParameters = new Dictionary<string, Microsoft.Extensions.Primitives.StringValues>
+            {
+                { "Stripe-Signature", signature },
+            },
+        };
+
+        var response = ((IPaymentProvider)this).TransactionStatusChange(payload).GetAwaiter().GetResult();
+
+        // Signature failure — TransactionStatusChange returns Rejected + message containing "signature"
+        if (response.PaymentStatus == PaymentStatusEnum.Rejected
+            && response.ResponseObject?.ToString()?.Contains("signature", StringComparison.OrdinalIgnoreCase) == true)
+        {
+            return Task.FromResult(PaymentWebhookResult.Fail(response.ResponseObject?.ToString() ?? "Invalid signature"));
+        }
+
+        // Non-actionable event (payment_method.attached, customer.created, …)
+        if (response.PaymentStatus == PaymentStatusEnum.Processing
+            || string.IsNullOrEmpty(response.PaymentUniqueId))
+        {
+            return Task.FromResult(PaymentWebhookResult.Ignore("Non-actionable Stripe event"));
+        }
+
+        return Task.FromResult(PaymentWebhookResult.Ok(response));
+    }
+
+    // ─── Helpers ────────────────────────────────────────────────────────────
+
+    private static PaymentResponse HandleSessionCompleted(Event stripeEvent)
+    {
+        var session = stripeEvent.Data.Object as global::Stripe.Checkout.Session;
+        var status = session?.PaymentStatus == "paid"
+            ? PaymentStatusEnum.Finished
+            : PaymentStatusEnum.Processing;
+
+        return new PaymentResponse
+        {
+            PaymentUniqueId = session?.Id,
+            RedirectUrl = session?.Url,
+            PaymentStatus = status,
+            ResponseObject = "OK",
+        };
+    }
+
+    private static PaymentStatusEnum MapSessionStatus(global::Stripe.Checkout.Session session) =>
+        session.Status switch
+        {
+            "complete" when session.PaymentStatus == "paid" => PaymentStatusEnum.Finished,
+            "complete" => PaymentStatusEnum.Processing,
+            "expired" => PaymentStatusEnum.Rejected,
+            _ => PaymentStatusEnum.Created,   // "open"
+        };
+}
+
+// ─── DI Extensions ──────────────────────────────────────────────────────────
+
+/// <summary>
+/// Rozszerzenia DI analogiczne do <c>CashBillProviderExtensions.RegisterCashbillProvider()</c>.
+/// </summary>
+public static class StripeProviderExtensions
+{
+    /// <summary>
+    /// Rejestruje wszystkie usługi wymagane przez <see cref="StripeProvider"/>:
+    /// <see cref="StripeServiceOptions"/> (konfiguracja), <see cref="IStripeServiceCaller"/>,
+    /// i Stripe.net <c>SessionService</c>.
+    /// </summary>
+    public static void RegisterStripeProvider(this IServiceCollection services)
+    {
+        services.AddOptions<StripeServiceOptions>();
+        services.ConfigureOptions<StripeConfigureOptions>();
+        services.AddTransient<global::Stripe.Checkout.SessionService>();
+        services.AddTransient<IStripeServiceCaller, StripeServiceCaller>();
+
+        // Register as both IPaymentProvider (for PaymentService aggregator)
+        // and IWebhookPaymentProvider (for webhook dispatch).
+        services.AddTransient<StripeProvider>();
+        services.AddTransient<IWebhookPaymentProvider>(sp => sp.GetRequiredService<StripeProvider>());
+    }
+}
+
+/// <summary>
+/// Wczytuje opcje Stripe z sekcji <see cref="StripeServiceOptions.ConfigurationKey"/>.
+/// </summary>
+public class StripeConfigureOptions : IConfigureOptions<StripeServiceOptions>
+{
+    private readonly IConfiguration configuration;
+
+    /// <summary>Inicjalizuje instancję konfiguracji.</summary>
+    public StripeConfigureOptions(IConfiguration configuration)
+    {
+        this.configuration = configuration;
+    }
+
+    /// <inheritdoc/>
+    public void Configure(StripeServiceOptions options)
+    {
+        var section = configuration
+            .GetSection(StripeServiceOptions.ConfigurationKey)
+            .Get<StripeServiceOptions>();
+
+        if (section is null) return;
+
+        options.SecretKey = section.SecretKey;
+        options.WebhookSecret = section.WebhookSecret;
+        options.SuccessUrl = section.SuccessUrl;
+        options.CancelUrl = section.CancelUrl;
+    }
+}
diff --git a/src/TailoredApps.Shared.Payments.Provider.Stripe/StripeServiceCaller.cs b/src/TailoredApps.Shared.Payments.Provider.Stripe/StripeServiceCaller.cs
index c134909..cb4da85 100644
--- a/src/TailoredApps.Shared.Payments.Provider.Stripe/StripeServiceCaller.cs
+++ b/src/TailoredApps.Shared.Payments.Provider.Stripe/StripeServiceCaller.cs
@@ -1,125 +1,125 @@
-using global::Stripe;
-using global::Stripe.Checkout;
-using Microsoft.Extensions.Options;
-
-namespace TailoredApps.Shared.Payments.Provider.Stripe;
-
-/// <summary>
-/// Implementacja <see cref="IStripeServiceCaller"/> — wrapper nad oficjalnym Stripe.net SDK.
-/// Używa per-request <see cref="RequestOptions"/> zamiast globalnego StripeConfiguration.ApiKey,
-/// dzięki czemu obsługuje multi-tenant (różne klucze per żądanie).
-/// </summary>
-public class StripeServiceCaller : IStripeServiceCaller
-{
-    private readonly StripeServiceOptions options;
-
-    // Stripe.net services — wstrzykiwane przez DI (możliwe mockowanie w testach)
-    private readonly SessionService sessionService;
-
-    /// <summary>Inicjalizuje instancję callera.</summary>
-    public StripeServiceCaller(IOptions<StripeServiceOptions> options, SessionService sessionService)
-    {
-        this.options = options.Value;
-        this.sessionService = sessionService;
-    }
-
-    private RequestOptions RequestOptions => new() { ApiKey = options.SecretKey };
-
-    /// <inheritdoc/>
-    public async Task<Session> CreateCheckoutSessionAsync(Payments.PaymentRequest request)
-    {
-        // Metody płatności zależne od waluty
-        var paymentMethods = GetPaymentMethodsForCurrency(request.Currency);
-
-        var createOptions = new SessionCreateOptions
-        {
-            PaymentMethodTypes = paymentMethods,
-            LineItems =
-            [
-                new SessionLineItemOptions
-                {
-                    PriceData = new SessionLineItemPriceDataOptions
-                    {
-                        Currency    = request.Currency.ToLowerInvariant(),
-                        UnitAmount  = ToStripeAmount(request.Amount, request.Currency),
-                        ProductData = new SessionLineItemPriceDataProductDataOptions
-                        {
-                            Name        = request.Title,
-                            Description = request.Description,
-                        },
-                    },
-                    Quantity = 1,
-                }
-            ],
-            Mode         = "payment",
-            SuccessUrl   = options.SuccessUrl,
-            CancelUrl    = options.CancelUrl,
-            CustomerEmail = request.Email,
-            Metadata = new Dictionary<string, string>
-            {
-                { "additional_data", request.AdditionalData ?? string.Empty },
-                { "referer",         request.Referer         ?? string.Empty },
-                { "payment_channel", request.PaymentChannel  ?? string.Empty },
-            },
-        };
-
-        return await sessionService.CreateAsync(createOptions, RequestOptions);
-    }
-
-    /// <inheritdoc/>
-    public async Task<Session> GetCheckoutSessionAsync(string sessionId)
-    {
-        var getOptions = new SessionGetOptions
-        {
-            Expand = ["payment_intent"],
-        };
-
-        return await sessionService.GetAsync(sessionId, getOptions, RequestOptions);
-    }
-
-    /// <inheritdoc/>
-    /// <remarks>
-    /// throwOnApiVersionMismatch=false — nie wymuszamy zgodności wersji API eventu z SDK.
-    /// Stripe może wysyłać eventy ze starszą wersją API podczas przejść między wersjami.
-    /// Weryfikacja podpisu HMAC-SHA256 jest zawsze wykonywana.
-    /// </remarks>
-    public Event ConstructWebhookEvent(string payload, string stripeSignature)
-        => EventUtility.ConstructEvent(
-            payload,
-            stripeSignature,
-            options.WebhookSecret,
-            throwOnApiVersionMismatch: false);
-
-    // ─── Helpers ────────────────────────────────────────────────────────────
-
-    /// <summary>
-    /// Konwertuje kwotę dziesiętną na najmniejszą jednostkę waluty (np. grosze dla PLN).
-    /// Stripe wymaga kwot w najmniejszej jednostce (100 = 1,00 PLN).
-    /// Waluty "zero-decimal" (np. JPY) podajemy bez mnożenia.
-    /// </summary>
-    private static long ToStripeAmount(decimal amount, string currency)
-    {
-        // Waluty bez podjednostek (zero-decimal currencies wg Stripe docs)
-        HashSet<string> zeroDecimal =
-        [
-            "bif","clp","gnf","jpy","kmf","krw","mga","pyg","rwf","ugx","vnd","vuv","xaf","xof","xpf"
-        ];
-
-        return zeroDecimal.Contains(currency.ToLowerInvariant())
-            ? (long)amount
-            : (long)(amount * 100);
-    }
-
-    /// <summary>
-    /// Zwraca listę metod płatności dostępnych dla danej waluty.
-    /// PLN: karta + BLIK + Przelewy24 (p24).
-    /// Inne: tylko karta (najbezpieczniejszy fallback).
-    /// </summary>
-    private static List<string> GetPaymentMethodsForCurrency(string currency) =>
-        currency.ToUpperInvariant() switch
-        {
-            "PLN" => ["card", "blik", "p24"],
-            "EUR" => ["card", "sepa_debit"],
-            _     => ["card"],
-        };
-}
+using global::Stripe;
+using global::Stripe.Checkout;
+using Microsoft.Extensions.Options;
+
+namespace TailoredApps.Shared.Payments.Provider.Stripe;
+
+/// <summary>
+/// Implementacja <see cref="IStripeServiceCaller"/> — wrapper nad oficjalnym Stripe.net SDK.
+/// Używa per-request <see cref="RequestOptions"/> zamiast globalnego StripeConfiguration.ApiKey,
+/// dzięki czemu obsługuje multi-tenant (różne klucze per żądanie).
+/// </summary>
+public class StripeServiceCaller : IStripeServiceCaller
+{
+    private readonly StripeServiceOptions options;
+
+    // Stripe.net services — wstrzykiwane przez DI (możliwe mockowanie w testach)
+    private readonly SessionService sessionService;
+
+    /// <summary>Inicjalizuje instancję callera.</summary>
+    public StripeServiceCaller(IOptions<StripeServiceOptions> options, SessionService sessionService)
+    {
+        this.options = options.Value;
+        this.sessionService = sessionService;
+    }
+
+    private RequestOptions RequestOptions => new() { ApiKey = options.SecretKey };
+
+    /// <inheritdoc/>
+    public async Task<Session> CreateCheckoutSessionAsync(Payments.PaymentRequest request)
+    {
+        // Metody płatności zależne od waluty
+        var paymentMethods = GetPaymentMethodsForCurrency(request.Currency);
+
+        var createOptions = new SessionCreateOptions
+        {
+            PaymentMethodTypes = paymentMethods,
+            LineItems =
+            [
+                new SessionLineItemOptions
+                {
+                    PriceData = new SessionLineItemPriceDataOptions
+                    {
+                        Currency    = request.Currency.ToLowerInvariant(),
+                        UnitAmount  = ToStripeAmount(request.Amount, request.Currency),
+                        ProductData = new SessionLineItemPriceDataProductDataOptions
+                        {
+                            Name        = request.Title,
+                            Description = request.Description,
+                        },
+                    },
+                    Quantity = 1,
+                }
+            ],
+            Mode = "payment",
+            SuccessUrl = options.SuccessUrl,
+            CancelUrl = options.CancelUrl,
+            CustomerEmail = request.Email,
+            Metadata = new Dictionary<string, string>
+            {
+                { "additional_data", request.AdditionalData ?? string.Empty },
+                { "referer",         request.Referer         ?? string.Empty },
+                { "payment_channel", request.PaymentChannel  ?? string.Empty },
+            },
+        };
+
+        return await sessionService.CreateAsync(createOptions, RequestOptions);
+    }
+
+    /// <inheritdoc/>
+    public async Task<Session> GetCheckoutSessionAsync(string sessionId)
+    {
+        var getOptions = new SessionGetOptions
+        {
+            Expand = ["payment_intent"],
+        };
+
+        return await sessionService.GetAsync(sessionId, getOptions, RequestOptions);
+    }
+
+    /// <inheritdoc/>
+    /// <remarks>
+    /// throwOnApiVersionMismatch=false — nie wymuszamy zgodności wersji API eventu z SDK.
+    /// Stripe może wysyłać eventy ze starszą wersją API podczas przejść między wersjami.
+    /// Weryfikacja podpisu HMAC-SHA256 jest zawsze wykonywana.
+    /// </remarks>
+    public Event ConstructWebhookEvent(string payload, string stripeSignature)
+        => EventUtility.ConstructEvent(
+            payload,
+            stripeSignature,
+            options.WebhookSecret,
+            throwOnApiVersionMismatch: false);
+
+    // ─── Helpers ────────────────────────────────────────────────────────────
+
+    /// <summary>
+    /// Konwertuje kwotę dziesiętną na najmniejszą jednostkę waluty (np. grosze dla PLN).
+    /// Stripe wymaga kwot w najmniejszej jednostce (100 = 1,00 PLN).
+    /// Waluty "zero-decimal" (np. JPY) podajemy bez mnożenia.
+    /// </summary>
+    private static long ToStripeAmount(decimal amount, string currency)
+    {
+        // Waluty bez podjednostek (zero-decimal currencies wg Stripe docs)
+        HashSet<string> zeroDecimal =
+        [
+            "bif","clp","gnf","jpy","kmf","krw","mga","pyg","rwf","ugx","vnd","vuv","xaf","xof","xpf"
+        ];
+
+        return zeroDecimal.Contains(currency.ToLowerInvariant())
+            ? (long)amount
+            : (long)(amount * 100);
+    }
+
+    /// <summary>
+    /// Zwraca listę metod płatności dostępnych dla danej waluty.
+    /// PLN: karta + BLIK + Przelewy24 (p24).
+    /// Inne: tylko karta (najbezpieczniejszy fallback).
+    /// </summary>
+    private static List<string> GetPaymentMethodsForCurrency(string currency) =>
+        currency.ToUpperInvariant() switch
+        {
+            "PLN" => ["card", "blik", "p24"],
+            "EUR" => ["card", "sepa_debit"],
+            _ => ["card"],
+        };
+}
diff --git a/src/TailoredApps.Shared.Payments.Provider.Stripe/StripeServiceOptions.cs b/src/TailoredApps.Shared.Payments.Provider.Stripe/StripeServiceOptions.cs
index d0583c0..108451b 100644
--- a/src/TailoredApps.Shared.Payments.Provider.Stripe/StripeServiceOptions.cs
+++ b/src/TailoredApps.Shared.Payments.Provider.Stripe/StripeServiceOptions.cs
@@ -1,33 +1,33 @@
-namespace TailoredApps.Shared.Payments.Provider.Stripe;
-
-/// <summary>
-/// Konfiguracja providera Stripe.
-/// Sekcja w appsettings.json: <see cref="ConfigurationKey"/>.
-/// </summary>
-public class StripeServiceOptions
-{
-    /// <summary>Klucz sekcji konfiguracji.</summary>
-    public static string ConfigurationKey => "Payments:Providers:Stripe";
-
-    /// <summary>
-    /// Klucz sekretny Stripe (sk_live_... lub sk_test_...).
-    /// </summary>
-    public string SecretKey { get; set; } = string.Empty;
-
-    /// <summary>
-    /// Sekret webhooka (whsec_...) — do weryfikacji podpisu HMAC-SHA256.
-    /// </summary>
-    public string WebhookSecret { get; set; } = string.Empty;
-
-    /// <summary>
-    /// URL powrotu po udanej płatności.
-    /// Stripe podmienia {CHECKOUT_SESSION_ID} na id sesji.
-    /// Przykład: "https://example.com/payment/success?session={CHECKOUT_SESSION_ID}"
-    /// </summary>
-    public string SuccessUrl { get; set; } = string.Empty;
-
-    /// <summary>
-    /// URL powrotu po anulowaniu lub błędzie płatności.
-    /// </summary>
-    public string CancelUrl { get; set; } = string.Empty;
-}
+namespace TailoredApps.Shared.Payments.Provider.Stripe;
+
+/// <summary>
+/// Konfiguracja providera Stripe.
+/// Sekcja w appsettings.json: <see cref="ConfigurationKey"/>.
+/// </summary>
+public class StripeServiceOptions
+{
+    /// <summary>Klucz sekcji konfiguracji.</summary>
+    public static string ConfigurationKey => "Payments:Providers:Stripe";
+
+    /// <summary>
+    /// Klucz sekretny Stripe (sk_live_... lub sk_test_...).
+    /// </summary>
+    public string SecretKey { get; set; } = string.Empty;
+
+    /// <summary>
+    /// Sekret webhooka (whsec_...) — do weryfikacji podpisu HMAC-SHA256.
+    /// </summary>
+    public string WebhookSecret { get; set; } = string.Empty;
+
+    /// <summary>
+    /// URL powrotu po udanej płatności.
+    /// Stripe podmienia {CHECKOUT_SESSION_ID} na id sesji.
+    /// Przykład: "https://example.com/payment/success?session={CHECKOUT_SESSION_ID}"
+    /// </summary>
+    public string SuccessUrl { get; set; } = string.Empty;
+
+    /// <summary>
+    /// URL powrotu po anulowaniu lub błędzie płatności.
+    /// </summary>
+    public string CancelUrl { get; set; } = string.Empty;
+}
diff --git a/src/TailoredApps.Shared.Payments.Provider.Tpay/TpayProvider.cs b/src/TailoredApps.Shared.Payments.Provider.Tpay/TpayProvider.cs
index cecec4c..11e0ebb 100644
--- a/src/TailoredApps.Shared.Payments.Provider.Tpay/TpayProvider.cs
+++ b/src/TailoredApps.Shared.Payments.Provider.Tpay/TpayProvider.cs
@@ -1,350 +1,355 @@
-using System.Net.Http;
-using System.Net.Http.Headers;
-using System.Security.Cryptography;
-using System.Text;
-using System.Text.Json;
-using System.Text.Json.Serialization;
-using Microsoft.Extensions.Configuration;
-using Microsoft.Extensions.DependencyInjection;
-using Microsoft.Extensions.Options;
-
-namespace TailoredApps.Shared.Payments.Provider.Tpay;
-
-public class TpayServiceOptions
-{
-    /// <summary>Klucz sekcji konfiguracji.</summary>
-    public static string ConfigurationKey => "Payments:Providers:Tpay";
-    /// <summary>ClientId.</summary>
-    public string ClientId     { get; set; } = string.Empty;
-    /// <summary>ClientSecret.</summary>
-    public string ClientSecret { get; set; } = string.Empty;
-    /// <summary>MerchantId.</summary>
-    public string MerchantId   { get; set; } = string.Empty;
-    /// <summary>Base URL of the Tpay API endpoint.</summary>
-    public string ServiceUrl   { get; set; } = "https://api.tpay.com";
-
-    /// <summary>Alias for <see cref="ServiceUrl"/> — kept for backwards compatibility.</summary>
-    [Obsolete("Use ServiceUrl instead.")]
-    public string ApiUrl
-    {
-        get => ServiceUrl;
-        set => ServiceUrl = value;
-    }
-    /// <summary>ReturnUrl.</summary>
-    public string ReturnUrl    { get; set; } = string.Empty;
-    /// <summary>NotifyUrl.</summary>
-    public string NotifyUrl    { get; set; } = string.Empty;
-    /// <summary>SecurityCode.</summary>
-    public string SecurityCode { get; set; } = string.Empty;
-}
-
-file class TpayTokenResponse
-{
-    [JsonPropertyName("access_token")] public string AccessToken { get; set; } = string.Empty;
-}
-
-file class TpayTransactionRequest
-{
-    [JsonPropertyName("amount")]            public decimal Amount        { get; set; }
-    [JsonPropertyName("description")]       public string  Description   { get; set; } = string.Empty;
-    [JsonPropertyName("hiddenDescription")] public string? HiddenDescription { get; set; }
-    [JsonPropertyName("lang")]              public string  Lang          { get; set; } = "pl";
-    [JsonPropertyName("pay")]               public TpayPay Pay           { get; set; } = new();
-    [JsonPropertyName("payer")]             public TpayPayer Payer       { get; set; } = new();
-    [JsonPropertyName("callbacks")]         public TpayCallbacks Callbacks { get; set; } = new();
-}
-
-file class TpayPay
-{
-    [JsonPropertyName("groupId")]  public int?    GroupId  { get; set; }
-    [JsonPropertyName("channel")]  public string? Channel  { get; set; }
-}
-
-file class TpayPayer
-{
-    [JsonPropertyName("email")] public string Email { get; set; } = string.Empty;
-    [JsonPropertyName("name")]  public string Name  { get; set; } = string.Empty;
-}
-
-file class TpayCallbacks
-{
-    [JsonPropertyName("payerUrls")]    public TpayPayerUrls PayerUrls       { get; set; } = new();
-    [JsonPropertyName("notification")] public TpayNotification Notification { get; set; } = new();
-}
-
-file class TpayPayerUrls
-{
-    [JsonPropertyName("success")] public string Success { get; set; } = string.Empty;
-    [JsonPropertyName("error")]   public string Error   { get; set; } = string.Empty;
-}
-
-file class TpayNotification
-{
-    [JsonPropertyName("url")]   public string Url   { get; set; } = string.Empty;
-    [JsonPropertyName("email")] public string Email { get; set; } = string.Empty;
-}
-
-file class TpayTransactionResponse
-{
-    [JsonPropertyName("transactionId")]         public string? TransactionId { get; set; }
-    [JsonPropertyName("transactionPaymentUrl")] public string? PaymentUrl    { get; set; }
-    [JsonPropertyName("title")]                 public string? Title         { get; set; }
-}
-
-file class TpayStatusResponse
-{
-    [JsonPropertyName("status")] public string? Status { get; set; }
-}
-
-/// <summary>Abstrakcja nad Tpay REST API.</summary>
-public interface ITpayServiceCaller
-{
-    /// <summary>Wywołanie API.</summary>
-    Task<string> GetAccessTokenAsync();
-    /// <summary>Wywołanie API.</summary>
-    Task<(string? transactionId, string? paymentUrl)> CreateTransactionAsync(string token, PaymentRequest request);
-    /// <summary>Wywołanie API.</summary>
-    Task<PaymentStatusEnum> GetTransactionStatusAsync(string token, string transactionId);
-    /// <summary>Weryfikuje podpis powiadomienia.</summary>
-    bool VerifyNotification(string body, string signature);
-}
-
-/// <summary>Implementacja <see cref="ITpayServiceCaller"/>.</summary>
-public class TpayServiceCaller : ITpayServiceCaller
-{
-    private readonly TpayServiceOptions options;
-    private readonly IHttpClientFactory httpClientFactory;
-
-    /// <summary>Inicjalizuje instancję callera.</summary>
-    public TpayServiceCaller(IOptions<TpayServiceOptions> options, IHttpClientFactory httpClientFactory)
-    {
-        this.options = options.Value;
-        this.httpClientFactory = httpClientFactory;
-    }
-
-    /// <inheritdoc/>
-    public async Task<string> GetAccessTokenAsync()
-    {
-        using var client = httpClientFactory.CreateClient("Tpay");
-        var content = new FormUrlEncodedContent([
-            new("grant_type",    "client_credentials"),
-            new("client_id",     options.ClientId),
-            new("client_secret", options.ClientSecret),
-        ]);
-        var response = await client.PostAsync($"{options.ServiceUrl}/oauth/auth", content);
-        response.EnsureSuccessStatusCode();
-        var json = await response.Content.ReadAsStringAsync();
-        return JsonSerializer.Deserialize<TpayTokenResponse>(json)?.AccessToken ?? string.Empty;
-    }
-
-    /// <inheritdoc/>
-    public async Task<(string? transactionId, string? paymentUrl)> CreateTransactionAsync(string token, PaymentRequest request)
-    {
-        using var client = httpClientFactory.CreateClient("Tpay");
-        client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", token);
-
-        var body = new TpayTransactionRequest
-        {
-            Amount      = request.Amount,
-            Description = request.Title ?? request.Description ?? "Order",
-            Payer       = new TpayPayer { Email = request.Email ?? string.Empty, Name = $"{request.FirstName} {request.Surname}".Trim() },
-            Callbacks   = new TpayCallbacks
-            {
-                PayerUrls    = new TpayPayerUrls { Success = options.ReturnUrl, Error = options.ReturnUrl },
-                Notification = new TpayNotification { Url = options.NotifyUrl, Email = request.Email ?? string.Empty },
-            },
-        };
-
-        if (!string.IsNullOrWhiteSpace(request.PaymentChannel))
-            body.Pay = new TpayPay { Channel = request.PaymentChannel };
-
-        var content  = new StringContent(JsonSerializer.Serialize(body), Encoding.UTF8, "application/json");
-        var response = await client.PostAsync($"{options.ServiceUrl}/transactions", content);
-        var json     = await response.Content.ReadAsStringAsync();
-        var tx       = JsonSerializer.Deserialize<TpayTransactionResponse>(json);
-        return (tx?.TransactionId, tx?.PaymentUrl);
-    }
-
-    /// <inheritdoc/>
-    public async Task<PaymentStatusEnum> GetTransactionStatusAsync(string token, string transactionId)
-    {
-        using var client = httpClientFactory.CreateClient("Tpay");
-        client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", token);
-        var response = await client.GetAsync($"{options.ServiceUrl}/transactions/{transactionId}");
-        if (!response.IsSuccessStatusCode) return PaymentStatusEnum.Rejected;
-        var json   = await response.Content.ReadAsStringAsync();
-        var status = JsonSerializer.Deserialize<TpayStatusResponse>(json)?.Status;
-        return status switch
-        {
-            "correct"    => PaymentStatusEnum.Finished,
-            "pending"    => PaymentStatusEnum.Processing,
-            "error"      => PaymentStatusEnum.Rejected,
-            "chargeback" => PaymentStatusEnum.Rejected,
-            _            => PaymentStatusEnum.Created,
-        };
-    }
-
-    /// <inheritdoc/>
-    public bool VerifyNotification(string body, string signature)
-    {
-        var input    = body + options.SecurityCode;
-        var hash     = SHA256.HashData(Encoding.UTF8.GetBytes(input));
-        var computed = Convert.ToHexString(hash).ToLowerInvariant();
-        return string.Equals(computed, signature, StringComparison.OrdinalIgnoreCase);
-    }
-}
-
-/// <summary>Implementacja <see cref="IPaymentProvider"/> dla Tpay.</summary>
-public class TpayProvider : IPaymentProvider, IWebhookPaymentProvider
-{
-    private readonly ITpayServiceCaller caller;
-
-    /// <summary>Inicjalizuje instancję providera.</summary>
-    public TpayProvider(ITpayServiceCaller caller) => this.caller = caller;
-
-    public string Key         => "Tpay";
-    public string Name        => "Tpay";
-    /// <inheritdoc/>
-    public string Description => "Operator płatności Tpay — przelewy, BLIK, karty.";
-    public string Url         => "https://tpay.com";
-
-    /// <inheritdoc/>
-    public Task<ICollection<PaymentChannel>> GetPaymentChannels(string currency)
-    {
-        ICollection<PaymentChannel> channels =
-        [
-            new PaymentChannel { Id = "blik", Name = "BLIK",            Description = "BLIK",             PaymentModel = PaymentModel.OneTime },
-            new PaymentChannel { Id = "card", Name = "Karta płatnicza", Description = "Visa, Mastercard", PaymentModel = PaymentModel.OneTime },
-            new PaymentChannel { Id = "bank", Name = "Przelew online",  Description = "mTransfer, iPKO",  PaymentModel = PaymentModel.OneTime },
-        ];
-        return Task.FromResult(channels);
-    }
-
-    /// <inheritdoc/>
-    public async Task<PaymentResponse> RequestPayment(PaymentRequest request)
-    {
-        var token = await caller.GetAccessTokenAsync();
-        var (transactionId, paymentUrl) = await caller.CreateTransactionAsync(token, request);
-        if (transactionId is null)
-            return new PaymentResponse { PaymentStatus = PaymentStatusEnum.Rejected, ResponseObject = "API error" };
-        return new PaymentResponse
-        {
-            PaymentUniqueId = transactionId,
-            RedirectUrl     = paymentUrl,
-            PaymentStatus   = PaymentStatusEnum.Created,
-        };
-    }
-
-    /// <inheritdoc/>
-    public async Task<PaymentResponse> GetStatus(string paymentId)
-    {
-        var token  = await caller.GetAccessTokenAsync();
-        var status = await caller.GetTransactionStatusAsync(token, paymentId);
-        return new PaymentResponse { PaymentUniqueId = paymentId, PaymentStatus = status };
-    }
-
-    // ─── IWebhookPaymentProvider ─────────────────────────────────────────────
-
-    /// <inheritdoc/>
-    public async Task<PaymentWebhookResult> HandleWebhookAsync(PaymentWebhookRequest request)
-    {
-        var body      = request.Body ?? string.Empty;
-        var signature = request.Headers.TryGetValue("X-Signature", out var s) ? s.ToString() : string.Empty;
-
-        var payload = new TransactionStatusChangePayload
-        {
-            Payload         = body,
-            QueryParameters = new Dictionary<string, Microsoft.Extensions.Primitives.StringValues>
-            {
-                { "X-Signature", signature },
-            },
-        };
-
-        var response = await TransactionStatusChange(payload);
-
-        if (response.PaymentStatus == PaymentStatusEnum.Rejected)
-        {
-            var msg = response.ResponseObject?.ToString() ?? string.Empty;
-            if (msg.Contains("signature", StringComparison.OrdinalIgnoreCase) ||
-                msg.Contains("hash",      StringComparison.OrdinalIgnoreCase) ||
-                msg.Contains("sign",      StringComparison.OrdinalIgnoreCase) ||
-                msg.Contains("hmac",      StringComparison.OrdinalIgnoreCase))
-                return PaymentWebhookResult.Fail(msg);
-        }
-
-        if (response.PaymentStatus == PaymentStatusEnum.Processing && string.IsNullOrEmpty(response.PaymentUniqueId))
-            return PaymentWebhookResult.Ignore("Non-actionable event");
-
-        return PaymentWebhookResult.Ok(response);
-    }
-
-    /// <inheritdoc/>
-    public Task<PaymentResponse> TransactionStatusChange(TransactionStatusChangePayload payload)
-    {
-        var body = payload.Payload?.ToString() ?? string.Empty;
-        var sig  = payload.QueryParameters.TryGetValue("X-Signature", out var s) ? s.ToString() : string.Empty;
-
-        if (!caller.VerifyNotification(body, sig))
-            return Task.FromResult(new PaymentResponse { PaymentStatus = PaymentStatusEnum.Rejected, ResponseObject = "Invalid signature" });
-
-        var status = PaymentStatusEnum.Processing;
-        try
-        {
-            var doc = JsonDocument.Parse(body);
-            var root = doc.RootElement;
-            // Support both "status" (API v2) and "tr_status" (legacy webhook) fields
-            if (root.TryGetProperty("status", out var st) || root.TryGetProperty("tr_status", out st))
-                status = st.GetString() switch
-                {
-                    "paid"       => PaymentStatusEnum.Finished,
-                    "correct"    => PaymentStatusEnum.Finished,
-                    "TRUE"       => PaymentStatusEnum.Finished,
-                    "pending"    => PaymentStatusEnum.Processing,
-                    "error"      => PaymentStatusEnum.Rejected,
-                    "chargeback" => PaymentStatusEnum.Rejected,
-                    "FALSE"      => PaymentStatusEnum.Rejected,
-                    _            => PaymentStatusEnum.Processing,
-                };
-        }
-        catch { /* ignore */ }
-
-        return Task.FromResult(new PaymentResponse { PaymentStatus = status, ResponseObject = "OK" });
-    }
-}
-
-/// <summary>Rozszerzenia DI dla Tpay.</summary>
-public static class TpayProviderExtensions
-{
-    /// <summary>Rejestruje provider i jego zależności w kontenerze DI.</summary>
-    public static void RegisterTpayProvider(this IServiceCollection services)
-    {
-        services.AddOptions<TpayServiceOptions>();
-        services.ConfigureOptions<TpayConfigureOptions>();
-        services.AddHttpClient("Tpay");
-        services.AddTransient<ITpayServiceCaller, TpayServiceCaller>();
-        services.AddTransient<TpayProvider>();
-        services.AddTransient<IPaymentProvider>(sp => sp.GetRequiredService<TpayProvider>());
-        services.AddTransient<IWebhookPaymentProvider>(sp => sp.GetRequiredService<TpayProvider>());
-    }
-}
-
-/// <summary>Wczytuje opcje Tpay z konfiguracji.</summary>
-public class TpayConfigureOptions : IConfigureOptions<TpayServiceOptions>
-{
-    private readonly IConfiguration configuration;
-    /// <summary>Inicjalizuje instancję konfiguracji.</summary>
-    public TpayConfigureOptions(IConfiguration configuration) => this.configuration = configuration;
-    /// <inheritdoc/>
-    public void Configure(TpayServiceOptions options)
-    {
-        var s = configuration.GetSection(TpayServiceOptions.ConfigurationKey).Get<TpayServiceOptions>();
-        if (s is null) return;
-        options.ClientId     = s.ClientId;
-        options.ClientSecret = s.ClientSecret;
-        options.MerchantId   = s.MerchantId;
-        options.ServiceUrl       = s.ServiceUrl;
-        options.ReturnUrl    = s.ReturnUrl;
-        options.NotifyUrl    = s.NotifyUrl;
-        options.SecurityCode = s.SecurityCode;
-    }
-}
+using System.Net.Http;
+using System.Net.Http.Headers;
+using System.Security.Cryptography;
+using System.Text;
+using System.Text.Json;
+using System.Text.Json.Serialization;
+using Microsoft.Extensions.Configuration;
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Options;
+
+namespace TailoredApps.Shared.Payments.Provider.Tpay;
+
+/// <summary>Configuration options for the Tpay payment provider. Bound from section <c>Payments:Providers:Tpay</c>.</summary>
+public class TpayServiceOptions
+{
+    /// <summary>Klucz sekcji konfiguracji.</summary>
+    public static string ConfigurationKey => "Payments:Providers:Tpay";
+    /// <summary>ClientId.</summary>
+    public string ClientId { get; set; } = string.Empty;
+    /// <summary>ClientSecret.</summary>
+    public string ClientSecret { get; set; } = string.Empty;
+    /// <summary>MerchantId.</summary>
+    public string MerchantId { get; set; } = string.Empty;
+    /// <summary>Base URL of the Tpay API endpoint.</summary>
+    public string ServiceUrl { get; set; } = "https://api.tpay.com";
+
+    /// <summary>Alias for <see cref="ServiceUrl"/> — kept for backwards compatibility.</summary>
+    [Obsolete("Use ServiceUrl instead.")]
+    public string ApiUrl
+    {
+        get => ServiceUrl;
+        set => ServiceUrl = value;
+    }
+    /// <summary>ReturnUrl.</summary>
+    public string ReturnUrl { get; set; } = string.Empty;
+    /// <summary>NotifyUrl.</summary>
+    public string NotifyUrl { get; set; } = string.Empty;
+    /// <summary>SecurityCode.</summary>
+    public string SecurityCode { get; set; } = string.Empty;
+}
+
+file class TpayTokenResponse
+{
+    [JsonPropertyName("access_token")] public string AccessToken { get; set; } = string.Empty;
+}
+
+file class TpayTransactionRequest
+{
+    [JsonPropertyName("amount")] public decimal Amount { get; set; }
+    [JsonPropertyName("description")] public string Description { get; set; } = string.Empty;
+    [JsonPropertyName("hiddenDescription")] public string? HiddenDescription { get; set; }
+    [JsonPropertyName("lang")] public string Lang { get; set; } = "pl";
+    [JsonPropertyName("pay")] public TpayPay Pay { get; set; } = new();
+    [JsonPropertyName("payer")] public TpayPayer Payer { get; set; } = new();
+    [JsonPropertyName("callbacks")] public TpayCallbacks Callbacks { get; set; } = new();
+}
+
+file class TpayPay
+{
+    [JsonPropertyName("groupId")] public int? GroupId { get; set; }
+    [JsonPropertyName("channel")] public string? Channel { get; set; }
+}
+
+file class TpayPayer
+{
+    [JsonPropertyName("email")] public string Email { get; set; } = string.Empty;
+    /// <inheritdoc/>
+    [JsonPropertyName("name")] public string Name { get; set; } = string.Empty;
+}
+
+file class TpayCallbacks
+{
+    [JsonPropertyName("payerUrls")] public TpayPayerUrls PayerUrls { get; set; } = new();
+    [JsonPropertyName("notification")] public TpayNotification Notification { get; set; } = new();
+}
+
+file class TpayPayerUrls
+{
+    [JsonPropertyName("success")] public string Success { get; set; } = string.Empty;
+    [JsonPropertyName("error")] public string Error { get; set; } = string.Empty;
+}
+
+file class TpayNotification
+{
+    /// <inheritdoc/>
+    [JsonPropertyName("url")] public string Url { get; set; } = string.Empty;
+    [JsonPropertyName("email")] public string Email { get; set; } = string.Empty;
+}
+
+file class TpayTransactionResponse
+{
+    [JsonPropertyName("transactionId")] public string? TransactionId { get; set; }
+    [JsonPropertyName("transactionPaymentUrl")] public string? PaymentUrl { get; set; }
+    [JsonPropertyName("title")] public string? Title { get; set; }
+}
+
+file class TpayStatusResponse
+{
+    [JsonPropertyName("status")] public string? Status { get; set; }
+}
+
+/// <summary>Abstrakcja nad Tpay REST API.</summary>
+public interface ITpayServiceCaller
+{
+    /// <summary>Wywołanie API.</summary>
+    Task<string> GetAccessTokenAsync();
+    /// <summary>Wywołanie API.</summary>
+    Task<(string? transactionId, string? paymentUrl)> CreateTransactionAsync(string token, PaymentRequest request);
+    /// <summary>Wywołanie API.</summary>
+    Task<PaymentStatusEnum> GetTransactionStatusAsync(string token, string transactionId);
+    /// <summary>Weryfikuje podpis powiadomienia.</summary>
+    bool VerifyNotification(string body, string signature);
+}
+
+/// <summary>Implementacja <see cref="ITpayServiceCaller"/>.</summary>
+public class TpayServiceCaller : ITpayServiceCaller
+{
+    private readonly TpayServiceOptions options;
+    private readonly IHttpClientFactory httpClientFactory;
+
+    /// <summary>Inicjalizuje instancję callera.</summary>
+    public TpayServiceCaller(IOptions<TpayServiceOptions> options, IHttpClientFactory httpClientFactory)
+    {
+        this.options = options.Value;
+        this.httpClientFactory = httpClientFactory;
+    }
+
+    /// <inheritdoc/>
+    public async Task<string> GetAccessTokenAsync()
+    {
+        using var client = httpClientFactory.CreateClient("Tpay");
+        var content = new FormUrlEncodedContent([
+            new("grant_type",    "client_credentials"),
+            new("client_id",     options.ClientId),
+            new("client_secret", options.ClientSecret),
+        ]);
+        var response = await client.PostAsync($"{options.ServiceUrl}/oauth/auth", content);
+        response.EnsureSuccessStatusCode();
+        var json = await response.Content.ReadAsStringAsync();
+        return JsonSerializer.Deserialize<TpayTokenResponse>(json)?.AccessToken ?? string.Empty;
+    }
+
+    /// <inheritdoc/>
+    public async Task<(string? transactionId, string? paymentUrl)> CreateTransactionAsync(string token, PaymentRequest request)
+    {
+        using var client = httpClientFactory.CreateClient("Tpay");
+        client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", token);
+
+        var body = new TpayTransactionRequest
+        {
+            Amount = request.Amount,
+            Description = request.Title ?? request.Description ?? "Order",
+            Payer = new TpayPayer { Email = request.Email ?? string.Empty, Name = $"{request.FirstName} {request.Surname}".Trim() },
+            Callbacks = new TpayCallbacks
+            {
+                PayerUrls = new TpayPayerUrls { Success = options.ReturnUrl, Error = options.ReturnUrl },
+                Notification = new TpayNotification { Url = options.NotifyUrl, Email = request.Email ?? string.Empty },
+            },
+        };
+
+        if (!string.IsNullOrWhiteSpace(request.PaymentChannel))
+            body.Pay = new TpayPay { Channel = request.PaymentChannel };
+
+        var content = new StringContent(JsonSerializer.Serialize(body), Encoding.UTF8, "application/json");
+        var response = await client.PostAsync($"{options.ServiceUrl}/transactions", content);
+        var json = await response.Content.ReadAsStringAsync();
+        var tx = JsonSerializer.Deserialize<TpayTransactionResponse>(json);
+        return (tx?.TransactionId, tx?.PaymentUrl);
+    }
+
+    /// <inheritdoc/>
+    public async Task<PaymentStatusEnum> GetTransactionStatusAsync(string token, string transactionId)
+    {
+        using var client = httpClientFactory.CreateClient("Tpay");
+        client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", token);
+        var response = await client.GetAsync($"{options.ServiceUrl}/transactions/{transactionId}");
+        if (!response.IsSuccessStatusCode) return PaymentStatusEnum.Rejected;
+        var json = await response.Content.ReadAsStringAsync();
+        var status = JsonSerializer.Deserialize<TpayStatusResponse>(json)?.Status;
+        return status switch
+        {
+            "correct" => PaymentStatusEnum.Finished,
+            "pending" => PaymentStatusEnum.Processing,
+            "error" => PaymentStatusEnum.Rejected,
+            "chargeback" => PaymentStatusEnum.Rejected,
+            _ => PaymentStatusEnum.Created,
+        };
+    }
+
+    /// <inheritdoc/>
+    public bool VerifyNotification(string body, string signature)
+    {
+        var input = body + options.SecurityCode;
+        var hash = SHA256.HashData(Encoding.UTF8.GetBytes(input));
+        var computed = Convert.ToHexString(hash).ToLowerInvariant();
+        return string.Equals(computed, signature, StringComparison.OrdinalIgnoreCase);
+    }
+}
+
+/// <summary>Implementacja <see cref="IPaymentProvider"/> dla Tpay.</summary>
+public class TpayProvider : IPaymentProvider, IWebhookPaymentProvider
+{
+    private readonly ITpayServiceCaller caller;
+
+    /// <summary>Inicjalizuje instancję providera.</summary>
+    public TpayProvider(ITpayServiceCaller caller) => this.caller = caller;
+
+    /// <inheritdoc/>
+    public string Key => "Tpay";
+    /// <inheritdoc/>
+    public string Name => "Tpay";
+    /// <inheritdoc/>
+    public string Description => "Operator płatności Tpay — przelewy, BLIK, karty.";
+    /// <inheritdoc/>
+    public string Url => "https://tpay.com";
+
+    /// <inheritdoc/>
+    public Task<ICollection<PaymentChannel>> GetPaymentChannels(string currency)
+    {
+        ICollection<PaymentChannel> channels =
+        [
+            new PaymentChannel { Id = "blik", Name = "BLIK",            Description = "BLIK",             PaymentModel = PaymentModel.OneTime },
+            new PaymentChannel { Id = "card", Name = "Karta płatnicza", Description = "Visa, Mastercard", PaymentModel = PaymentModel.OneTime },
+            new PaymentChannel { Id = "bank", Name = "Przelew online",  Description = "mTransfer, iPKO",  PaymentModel = PaymentModel.OneTime },
+        ];
+        return Task.FromResult(channels);
+    }
+
+    /// <inheritdoc/>
+    public async Task<PaymentResponse> RequestPayment(PaymentRequest request)
+    {
+        var token = await caller.GetAccessTokenAsync();
+        var (transactionId, paymentUrl) = await caller.CreateTransactionAsync(token, request);
+        if (transactionId is null)
+            return new PaymentResponse { PaymentStatus = PaymentStatusEnum.Rejected, ResponseObject = "API error" };
+        return new PaymentResponse
+        {
+            PaymentUniqueId = transactionId,
+            RedirectUrl = paymentUrl,
+            PaymentStatus = PaymentStatusEnum.Created,
+        };
+    }
+
+    /// <inheritdoc/>
+    public async Task<PaymentResponse> GetStatus(string paymentId)
+    {
+        var token = await caller.GetAccessTokenAsync();
+        var status = await caller.GetTransactionStatusAsync(token, paymentId);
+        return new PaymentResponse { PaymentUniqueId = paymentId, PaymentStatus = status };
+    }
+
+    // ─── IWebhookPaymentProvider ─────────────────────────────────────────────
+
+    /// <inheritdoc/>
+    public async Task<PaymentWebhookResult> HandleWebhookAsync(PaymentWebhookRequest request)
+    {
+        var body = request.Body ?? string.Empty;
+        var signature = request.Headers.TryGetValue("X-Signature", out var s) ? s.ToString() : string.Empty;
+
+        var payload = new TransactionStatusChangePayload
+        {
+            Payload = body,
+            QueryParameters = new Dictionary<string, Microsoft.Extensions.Primitives.StringValues>
+            {
+                { "X-Signature", signature },
+            },
+        };
+
+        var response = await TransactionStatusChange(payload);
+
+        if (response.PaymentStatus == PaymentStatusEnum.Rejected)
+        {
+            var msg = response.ResponseObject?.ToString() ?? string.Empty;
+            if (msg.Contains("signature", StringComparison.OrdinalIgnoreCase) ||
+                msg.Contains("hash", StringComparison.OrdinalIgnoreCase) ||
+                msg.Contains("sign", StringComparison.OrdinalIgnoreCase) ||
+                msg.Contains("hmac", StringComparison.OrdinalIgnoreCase))
+                return PaymentWebhookResult.Fail(msg);
+        }
+
+        if (response.PaymentStatus == PaymentStatusEnum.Processing && string.IsNullOrEmpty(response.PaymentUniqueId))
+            return PaymentWebhookResult.Ignore("Non-actionable event");
+
+        return PaymentWebhookResult.Ok(response);
+    }
+
+    /// <inheritdoc/>
+    public Task<PaymentResponse> TransactionStatusChange(TransactionStatusChangePayload payload)
+    {
+        var body = payload.Payload?.ToString() ?? string.Empty;
+        var sig = payload.QueryParameters.TryGetValue("X-Signature", out var s) ? s.ToString() : string.Empty;
+
+        if (!caller.VerifyNotification(body, sig))
+            return Task.FromResult(new PaymentResponse { PaymentStatus = PaymentStatusEnum.Rejected, ResponseObject = "Invalid signature" });
+
+        var status = PaymentStatusEnum.Processing;
+        try
+        {
+            var doc = JsonDocument.Parse(body);
+            var root = doc.RootElement;
+            // Support both "status" (API v2) and "tr_status" (legacy webhook) fields
+            if (root.TryGetProperty("status", out var st) || root.TryGetProperty("tr_status", out st))
+                status = st.GetString() switch
+                {
+                    "paid" => PaymentStatusEnum.Finished,
+                    "correct" => PaymentStatusEnum.Finished,
+                    "TRUE" => PaymentStatusEnum.Finished,
+                    "pending" => PaymentStatusEnum.Processing,
+                    "error" => PaymentStatusEnum.Rejected,
+                    "chargeback" => PaymentStatusEnum.Rejected,
+                    "FALSE" => PaymentStatusEnum.Rejected,
+                    _ => PaymentStatusEnum.Processing,
+                };
+        }
+        catch { /* ignore */ }
+
+        return Task.FromResult(new PaymentResponse { PaymentStatus = status, ResponseObject = "OK" });
+    }
+}
+
+/// <summary>Rozszerzenia DI dla Tpay.</summary>
+public static class TpayProviderExtensions
+{
+    /// <summary>Rejestruje provider i jego zależności w kontenerze DI.</summary>
+    public static void RegisterTpayProvider(this IServiceCollection services)
+    {
+        services.AddOptions<TpayServiceOptions>();
+        services.ConfigureOptions<TpayConfigureOptions>();
+        services.AddHttpClient("Tpay");
+        services.AddTransient<ITpayServiceCaller, TpayServiceCaller>();
+        services.AddTransient<TpayProvider>();
+        services.AddTransient<IWebhookPaymentProvider>(sp => sp.GetRequiredService<TpayProvider>());
+    }
+}
+
+/// <summary>Wczytuje opcje Tpay z konfiguracji.</summary>
+public class TpayConfigureOptions : IConfigureOptions<TpayServiceOptions>
+{
+    private readonly IConfiguration configuration;
+    /// <summary>Inicjalizuje instancję konfiguracji.</summary>
+    public TpayConfigureOptions(IConfiguration configuration) => this.configuration = configuration;
+    /// <inheritdoc/>
+    public void Configure(TpayServiceOptions options)
+    {
+        var s = configuration.GetSection(TpayServiceOptions.ConfigurationKey).Get<TpayServiceOptions>();
+        if (s is null) return;
+        options.ClientId = s.ClientId;
+        options.ClientSecret = s.ClientSecret;
+        options.MerchantId = s.MerchantId;
+        options.ServiceUrl = s.ServiceUrl;
+        options.ReturnUrl = s.ReturnUrl;
+        options.NotifyUrl = s.NotifyUrl;
+        options.SecurityCode = s.SecurityCode;
+    }
+}
diff --git a/src/TailoredApps.Shared.Payments/IPaymentOptionsBuilder.cs b/src/TailoredApps.Shared.Payments/IPaymentOptionsBuilder.cs
index 1af8db8..62a3408 100644
--- a/src/TailoredApps.Shared.Payments/IPaymentOptionsBuilder.cs
+++ b/src/TailoredApps.Shared.Payments/IPaymentOptionsBuilder.cs
@@ -1,14 +1,30 @@
-using Microsoft.Extensions.DependencyInjection;
 using System;
+using Microsoft.Extensions.DependencyInjection;
 
 namespace TailoredApps.Shared.Payments
 {
+    /// <summary>
+    /// Fluent builder for registering payment providers with the DI container.
+    /// Returned by <c>AddPayments()</c> extension methods on <see cref="IServiceCollection"/>.
+    /// </summary>
     public interface IPaymentOptionsBuilder
     {
+        /// <summary>
+        /// Registers a payment provider type using the default transient lifetime.
+        /// </summary>
+        /// <typeparam name="TPaymentProvider">Concrete provider type that implements <see cref="IPaymentProvider"/>.</typeparam>
+        /// <returns>The same builder instance for method chaining.</returns>
         IPaymentOptionsBuilder RegisterPaymentProvider<TPaymentProvider>() where TPaymentProvider : class, IPaymentProvider;
-        IPaymentOptionsBuilder RegisterPaymentProvider<TPaymentProvider>(Func<IServiceProvider, TPaymentProvider> implementationFactory) where TPaymentProvider : class, IPaymentProvider;
 
+        /// <summary>
+        /// Registers a payment provider using a custom factory delegate.
+        /// </summary>
+        /// <typeparam name="TPaymentProvider">Concrete provider type that implements <see cref="IPaymentProvider"/>.</typeparam>
+        /// <param name="implementationFactory">Factory delegate that creates the provider instance from the service provider.</param>
+        /// <returns>The same builder instance for method chaining.</returns>
+        IPaymentOptionsBuilder RegisterPaymentProvider<TPaymentProvider>(Func<IServiceProvider, TPaymentProvider> implementationFactory) where TPaymentProvider : class, IPaymentProvider;
 
+        /// <summary>Gets the underlying <see cref="IServiceCollection"/> for direct DI configuration.</summary>
         IServiceCollection Services { get; }
     }
 }
diff --git a/src/TailoredApps.Shared.Payments/IPaymentProvider.cs b/src/TailoredApps.Shared.Payments/IPaymentProvider.cs
index 808b8c8..9cc3b1e 100644
--- a/src/TailoredApps.Shared.Payments/IPaymentProvider.cs
+++ b/src/TailoredApps.Shared.Payments/IPaymentProvider.cs
@@ -1,19 +1,52 @@
-using System.Collections.Generic;
+using System.Collections.Generic;
 using System.Threading.Tasks;
 
 namespace TailoredApps.Shared.Payments
 {
+    /// <summary>
+    /// Core contract for a payment gateway integration.
+    /// Each provider implementation represents a single payment gateway (e.g. Stripe, PayU).
+    /// </summary>
     public interface IPaymentProvider
     {
-
+        /// <summary>Gets the unique key used to identify this provider (e.g. "Stripe", "PayU").</summary>
         string Key { get; }
+
+        /// <summary>Gets the display name of the provider.</summary>
         string Name { get; }
+
+        /// <summary>Gets a human-readable description of the provider.</summary>
         string Description { get; }
+
+        /// <summary>Gets the URL of the provider's website.</summary>
         string Url { get; }
 
+        /// <summary>
+        /// Returns the list of payment channels available for the given currency.
+        /// </summary>
+        /// <param name="currency">ISO 4217 currency code (e.g. "PLN", "EUR").</param>
+        /// <returns>Collection of available <see cref="PaymentChannel"/> objects.</returns>
         Task<ICollection<PaymentChannel>> GetPaymentChannels(string currency);
+
+        /// <summary>
+        /// Initiates a new payment transaction via this provider.
+        /// </summary>
+        /// <param name="request">Payment details including amount, currency, and payer information.</param>
+        /// <returns>Response containing the redirect URL and payment unique identifier.</returns>
         Task<PaymentResponse> RequestPayment(PaymentRequest request);
+
+        /// <summary>
+        /// Retrieves the current status of an existing payment.
+        /// </summary>
+        /// <param name="paymentId">Provider-specific payment or transaction identifier.</param>
+        /// <returns>Current <see cref="PaymentResponse"/> including status.</returns>
         Task<PaymentResponse> GetStatus(string paymentId);
+
+        /// <summary>
+        /// Processes an incoming status-change notification (back-channel or legacy webhook).
+        /// </summary>
+        /// <param name="payload">Payload wrapper containing body, query parameters, and provider ID.</param>
+        /// <returns>Resolved <see cref="PaymentResponse"/> with updated status.</returns>
         Task<PaymentResponse> TransactionStatusChange(TransactionStatusChangePayload payload);
     }
 }
diff --git a/src/TailoredApps.Shared.Payments/IPaymentService.cs b/src/TailoredApps.Shared.Payments/IPaymentService.cs
index c9b305b..2af9112 100644
--- a/src/TailoredApps.Shared.Payments/IPaymentService.cs
+++ b/src/TailoredApps.Shared.Payments/IPaymentService.cs
@@ -1,4 +1,4 @@
-using System.Collections.Generic;
+using System.Collections.Generic;
 using System.Threading.Tasks;
 
 namespace TailoredApps.Shared.Payments
diff --git a/src/TailoredApps.Shared.Payments/IWebhookPaymentProvider.cs b/src/TailoredApps.Shared.Payments/IWebhookPaymentProvider.cs
index 601fd5a..d955372 100644
--- a/src/TailoredApps.Shared.Payments/IWebhookPaymentProvider.cs
+++ b/src/TailoredApps.Shared.Payments/IWebhookPaymentProvider.cs
@@ -1,33 +1,33 @@
-using System.Threading.Tasks;
-
-namespace TailoredApps.Shared.Payments
-{
-    /// <summary>
-    /// Extension of <see cref="IPaymentProvider"/> for gateways that push
-    /// payment-status notifications via HTTP webhooks or back-channel calls.
-    /// </summary>
-    /// <remarks>
-    /// Providers that support webhooks implement this interface in addition to
-    /// <see cref="IPaymentProvider"/>.  The <see cref="IPaymentService"/> dispatches
-    /// incoming HTTP requests to the correct provider automatically based on
-    /// <see cref="IPaymentProvider.Key"/>.
-    /// </remarks>
-    public interface IWebhookPaymentProvider : IPaymentProvider
-    {
-        /// <summary>
-        /// Processes an incoming HTTP webhook/back-channel notification
-        /// from the payment gateway.
-        /// </summary>
-        /// <param name="request">
-        /// Unified representation of the raw HTTP request
-        /// (body, headers, query parameters, etc.).
-        /// </param>
-        /// <returns>
-        /// <see cref="PaymentWebhookResult.Ok"/> — notification was processed,
-        ///   <see cref="PaymentWebhookResult.PaymentResponse"/> contains the resolved status.<br/>
-        /// <see cref="PaymentWebhookResult.Ignore"/> — notification was valid but irrelevant.<br/>
-        /// <see cref="PaymentWebhookResult.Fail"/> — signature invalid, parse error, etc.
-        /// </returns>
-        Task<PaymentWebhookResult> HandleWebhookAsync(PaymentWebhookRequest request);
-    }
-}
+using System.Threading.Tasks;
+
+namespace TailoredApps.Shared.Payments
+{
+    /// <summary>
+    /// Extension of <see cref="IPaymentProvider"/> for gateways that push
+    /// payment-status notifications via HTTP webhooks or back-channel calls.
+    /// </summary>
+    /// <remarks>
+    /// Providers that support webhooks implement this interface in addition to
+    /// <see cref="IPaymentProvider"/>.  The <see cref="IPaymentService"/> dispatches
+    /// incoming HTTP requests to the correct provider automatically based on
+    /// <see cref="IPaymentProvider.Key"/>.
+    /// </remarks>
+    public interface IWebhookPaymentProvider : IPaymentProvider
+    {
+        /// <summary>
+        /// Processes an incoming HTTP webhook/back-channel notification
+        /// from the payment gateway.
+        /// </summary>
+        /// <param name="request">
+        /// Unified representation of the raw HTTP request
+        /// (body, headers, query parameters, etc.).
+        /// </param>
+        /// <returns>
+        /// <see cref="PaymentWebhookResult.Ok"/> — notification was processed,
+        ///   <see cref="PaymentWebhookResult.PaymentResponse"/> contains the resolved status.<br/>
+        /// <see cref="PaymentWebhookResult.Ignore"/> — notification was valid but irrelevant.<br/>
+        /// <see cref="PaymentWebhookResult.Fail"/> — signature invalid, parse error, etc.
+        /// </returns>
+        Task<PaymentWebhookResult> HandleWebhookAsync(PaymentWebhookRequest request);
+    }
+}
diff --git a/src/TailoredApps.Shared.Payments/PaymentChannels.cs b/src/TailoredApps.Shared.Payments/PaymentChannels.cs
index c63ecab..c64bb55 100644
--- a/src/TailoredApps.Shared.Payments/PaymentChannels.cs
+++ b/src/TailoredApps.Shared.Payments/PaymentChannels.cs
@@ -1,15 +1,29 @@
-using System.Collections.Generic;
+using System.Collections.Generic;
 
 namespace TailoredApps.Shared.Payments
 {
-
+    /// <summary>
+    /// Represents a single payment channel offered by a payment provider
+    /// (e.g. a specific bank transfer option, BLIK, or credit card).
+    /// </summary>
     public class PaymentChannel
     {
+        /// <summary>Gets or sets the unique identifier of the payment channel.</summary>
         public string Id { get; set; }
+
+        /// <summary>Gets or sets the payment model supported by this channel (one-time or subscription).</summary>
         public PaymentModel PaymentModel { get; set; }
+
+        /// <summary>Gets or sets the list of ISO 4217 currency codes accepted by this channel.</summary>
         public List<string> AvailableCurrencies { get; set; }
+
+        /// <summary>Gets or sets the display name of the payment channel.</summary>
         public string Name { get; set; }
+
+        /// <summary>Gets or sets a human-readable description of the payment channel.</summary>
         public string Description { get; set; }
+
+        /// <summary>Gets or sets the URL of the channel's logo image.</summary>
         public string LogoUrl { get; set; }
     }
 }
diff --git a/src/TailoredApps.Shared.Payments/PaymentModel.cs b/src/TailoredApps.Shared.Payments/PaymentModel.cs
index 0838355..fe08f8f 100644
--- a/src/TailoredApps.Shared.Payments/PaymentModel.cs
+++ b/src/TailoredApps.Shared.Payments/PaymentModel.cs
@@ -1,8 +1,14 @@
-namespace TailoredApps.Shared.Payments
+namespace TailoredApps.Shared.Payments
 {
+    /// <summary>
+    /// Defines the billing model of a payment channel.
+    /// </summary>
     public enum PaymentModel
     {
+        /// <summary>A single, non-recurring payment transaction.</summary>
         OneTime,
+
+        /// <summary>A recurring subscription-based payment.</summary>
         Subscription
     }
 }
diff --git a/src/TailoredApps.Shared.Payments/PaymentOptionsBuilder.cs b/src/TailoredApps.Shared.Payments/PaymentOptionsBuilder.cs
index 57199c3..42c8de1 100644
--- a/src/TailoredApps.Shared.Payments/PaymentOptionsBuilder.cs
+++ b/src/TailoredApps.Shared.Payments/PaymentOptionsBuilder.cs
@@ -1,28 +1,53 @@
-using Microsoft.Extensions.DependencyInjection;
 using System;
+using System.Linq;
+using Microsoft.Extensions.DependencyInjection;
 
 namespace TailoredApps.Shared.Payments
 {
+    /// <summary>
+    /// Default implementation of <see cref="IPaymentOptionsBuilder"/>.
+    /// Provides a fluent API for registering payment providers during application startup.
+    /// </summary>
     public class PaymentOptionsBuilder : IPaymentOptionsBuilder
     {
+        /// <summary>
+        /// Initializes a new instance of <see cref="PaymentOptionsBuilder"/> with the given service collection.
+        /// </summary>
+        /// <param name="serviceCollection">The DI service collection to register providers into.</param>
         public PaymentOptionsBuilder(IServiceCollection serviceCollection)
         {
             Services = serviceCollection;
         }
 
+        /// <inheritdoc/>
         public IServiceCollection Services { get; private set; }
 
+        /// <inheritdoc/>
         public IPaymentOptionsBuilder RegisterPaymentProvider<TPaymentProvider>() where TPaymentProvider : class, IPaymentProvider
             => WithPaymentProvider<TPaymentProvider>();
 
+        /// <inheritdoc/>
         public IPaymentOptionsBuilder RegisterPaymentProvider<TPaymentProvider>(Func<IServiceProvider, TPaymentProvider> implementationFactory) where TPaymentProvider : class, IPaymentProvider
             => WithPaymentProvider(implementationFactory);
 
 
         private IPaymentOptionsBuilder WithPaymentProvider<TPaymentProvider>() where TPaymentProvider : class, IPaymentProvider
         {
-
             Services.AddTransient<IPaymentProvider, TPaymentProvider>();
+
+            // If the provider also supports webhooks and is not already registered
+            // as IWebhookPaymentProvider (e.g. by Register*Provider()), register it here too.
+            // ActivatorUtilities.CreateInstance resolves constructor deps from the container
+            // without requiring TPaymentProvider to be pre-registered as itself.
+            // The explicit cast is safe because IsAssignableFrom is checked first.
+            if (typeof(IWebhookPaymentProvider).IsAssignableFrom(typeof(TPaymentProvider))
+                && !Services.Any(d => d.ServiceType == typeof(IWebhookPaymentProvider)
+                                      && d.ImplementationType == typeof(TPaymentProvider)))
+            {
+                Services.AddTransient<IWebhookPaymentProvider>(
+                    sp => (IWebhookPaymentProvider)ActivatorUtilities.CreateInstance<TPaymentProvider>(sp));
+            }
+
             return this;
         }
 
@@ -30,14 +55,32 @@ private IPaymentOptionsBuilder WithPaymentProvider<TPaymentProvider>(Func<IServi
             where TPaymentProvider : class, IPaymentProvider
         {
             Services.AddTransient<IPaymentProvider, TPaymentProvider>(implementationFactory);
+
+            if (typeof(IWebhookPaymentProvider).IsAssignableFrom(typeof(TPaymentProvider))
+                && !Services.Any(d => d.ServiceType == typeof(IWebhookPaymentProvider)
+                                      && d.ImplementationType == typeof(TPaymentProvider)))
+            {
+                Services.AddTransient<IWebhookPaymentProvider>(
+                    sp => (IWebhookPaymentProvider)implementationFactory(sp));
+            }
+
             return this;
         }
     }
 
 
 
+    /// <summary>
+    /// Extension methods for <see cref="IServiceCollection"/> to configure the payments infrastructure.
+    /// </summary>
     public static class ServiceCollectionExtensions
     {
+        /// <summary>
+        /// Registers the standard payments infrastructure using the built-in
+        /// <see cref="IPaymentService"/> / <see cref="PaymentService"/> pair.
+        /// </summary>
+        /// <param name="services">The DI service collection.</param>
+        /// <returns>An <see cref="IPaymentOptionsBuilder"/> for registering individual providers.</returns>
         public static IPaymentOptionsBuilder AddPayments(this IServiceCollection services)
         {
 
@@ -45,6 +88,14 @@ public static IPaymentOptionsBuilder AddPayments(this IServiceCollection service
 
         }
 
+        /// <summary>
+        /// Registers the payments infrastructure with a custom service interface and implementation,
+        /// suitable for Web API projects where scoped lifetime is required.
+        /// </summary>
+        /// <typeparam name="TTargetPaymentServiceInterface">Custom payment service interface.</typeparam>
+        /// <typeparam name="TTargetPaymentService">Concrete implementation of the custom interface.</typeparam>
+        /// <param name="services">The DI service collection.</param>
+        /// <returns>An <see cref="IPaymentOptionsBuilder"/> for registering individual providers.</returns>
         public static IPaymentOptionsBuilder AddPaymentsForWebApi<TTargetPaymentServiceInterface, TTargetPaymentService>(this IServiceCollection services)
             where TTargetPaymentService : class, TTargetPaymentServiceInterface
             where TTargetPaymentServiceInterface : class
@@ -52,6 +103,14 @@ public static IPaymentOptionsBuilder AddPaymentsForWebApi<TTargetPaymentServiceI
             return services.AddPayments<TTargetPaymentServiceInterface, TTargetPaymentService>();
         }
 
+        /// <summary>
+        /// Core registration helper — registers the payment service with scoped lifetime
+        /// under both the concrete type and the specified interface.
+        /// </summary>
+        /// <typeparam name="TTargetPaymentServiceInterface">Service interface to expose.</typeparam>
+        /// <typeparam name="TTargetPaymentService">Concrete implementation type.</typeparam>
+        /// <param name="services">The DI service collection.</param>
+        /// <returns>An <see cref="IPaymentOptionsBuilder"/> for registering individual providers.</returns>
         public static IPaymentOptionsBuilder AddPayments<TTargetPaymentServiceInterface, TTargetPaymentService>(this IServiceCollection services)
             where TTargetPaymentService : class, TTargetPaymentServiceInterface
             where TTargetPaymentServiceInterface : class
diff --git a/src/TailoredApps.Shared.Payments/PaymentProvider.cs b/src/TailoredApps.Shared.Payments/PaymentProvider.cs
index 62c39aa..b6f7847 100644
--- a/src/TailoredApps.Shared.Payments/PaymentProvider.cs
+++ b/src/TailoredApps.Shared.Payments/PaymentProvider.cs
@@ -1,9 +1,15 @@
-namespace TailoredApps.Shared.Payments
+namespace TailoredApps.Shared.Payments
 {
-
+    /// <summary>
+    /// Lightweight DTO representing a registered payment provider.
+    /// Returned by <see cref="IPaymentService.GetProviders"/> as a summary for UI listings.
+    /// </summary>
     public class PaymentProvider
     {
+        /// <summary>Gets or sets the unique key that identifies the provider (e.g. "Stripe", "PayU").</summary>
         public string Id { get; set; }
+
+        /// <summary>Gets or sets the display name of the provider.</summary>
         public string Name { get; set; }
     }
 }
diff --git a/src/TailoredApps.Shared.Payments/PaymentRequest.cs b/src/TailoredApps.Shared.Payments/PaymentRequest.cs
index c3ff89d..8872b6e 100644
--- a/src/TailoredApps.Shared.Payments/PaymentRequest.cs
+++ b/src/TailoredApps.Shared.Payments/PaymentRequest.cs
@@ -1,24 +1,63 @@
-namespace TailoredApps.Shared.Payments
+namespace TailoredApps.Shared.Payments
 {
+    /// <summary>
+    /// Encapsulates all information required to initiate a payment transaction
+    /// through a specific provider and channel.
+    /// </summary>
     public class PaymentRequest
     {
+        /// <summary>Gets or sets the key of the payment provider to use (e.g. "Stripe", "PayU").</summary>
         public string PaymentProvider { get; set; }
+
+        /// <summary>Gets or sets the identifier of the specific payment channel within the provider.</summary>
         public string PaymentChannel { get; set; }
+
+        /// <summary>Gets or sets the billing model (one-time or subscription).</summary>
         public PaymentModel PaymentModel { get; set; }
+
+        /// <summary>Gets or sets the short title or subject of the payment.</summary>
         public string Title { get; set; }
+
+        /// <summary>Gets or sets the detailed description displayed to the payer.</summary>
         public string Description { get; set; }
+
+        /// <summary>Gets or sets the ISO 4217 currency code (e.g. "PLN", "EUR").</summary>
         public string Currency { get; set; }
+
+        /// <summary>Gets or sets the payment amount in the specified currency.</summary>
         public decimal Amount { get; set; }
+
+        /// <summary>Gets or sets the payer's e-mail address.</summary>
         public string Email { get; set; }
+
+        /// <summary>Gets or sets the payer's first name.</summary>
         public string FirstName { get; set; }
+
+        /// <summary>Gets or sets the payer's surname.</summary>
         public string Surname { get; set; }
+
+        /// <summary>Gets or sets the payer's street address.</summary>
         public string Street { get; set; }
+
+        /// <summary>Gets or sets the house/building number of the payer's address.</summary>
         public string House { get; set; }
+
+        /// <summary>Gets or sets the flat/apartment number of the payer's address.</summary>
         public string Flat { get; set; }
+
+        /// <summary>Gets or sets the postal code of the payer's address.</summary>
         public string PostCode { get; set; }
+
+        /// <summary>Gets or sets the city of the payer's address.</summary>
         public string City { get; set; }
+
+        /// <summary>Gets or sets the ISO 3166-1 alpha-2 country code of the payer's address.</summary>
         public string Country { get; set; }
+
+        /// <summary>Gets or sets any additional provider-specific data associated with the payment.</summary>
         public string AdditionalData { get; set; }
+
+        /// <summary>Gets or sets the referrer URL or identifier associated with this payment request.</summary>
         public string Referer { get; set; }
     }
-}
\ No newline at end of file
+}
diff --git a/src/TailoredApps.Shared.Payments/PaymentResponse.cs b/src/TailoredApps.Shared.Payments/PaymentResponse.cs
index 39515d3..becaaea 100644
--- a/src/TailoredApps.Shared.Payments/PaymentResponse.cs
+++ b/src/TailoredApps.Shared.Payments/PaymentResponse.cs
@@ -1,10 +1,29 @@
-namespace TailoredApps.Shared.Payments
+namespace TailoredApps.Shared.Payments
 {
+    /// <summary>
+    /// Represents the result of a payment operation returned by a payment provider.
+    /// </summary>
     public class PaymentResponse
     {
+        /// <summary>
+        /// Gets or sets the URL to which the payer should be redirected
+        /// to complete the payment on the provider's hosted page.
+        /// </summary>
         public string RedirectUrl { get; set; }
+
+        /// <summary>
+        /// Gets or sets the provider-assigned unique identifier for this payment or transaction.
+        /// </summary>
         public string PaymentUniqueId { get; set; }
+
+        /// <summary>
+        /// Gets or sets the normalised payment status resolved from the provider's response.
+        /// </summary>
         public PaymentStatusEnum PaymentStatus { get; set; }
+
+        /// <summary>
+        /// Gets or sets the raw or provider-specific response object for advanced scenarios.
+        /// </summary>
         public object ResponseObject { get; set; }
     }
-}
\ No newline at end of file
+}
diff --git a/src/TailoredApps.Shared.Payments/PaymentService.cs b/src/TailoredApps.Shared.Payments/PaymentService.cs
index a0ba9fc..31acf0e 100644
--- a/src/TailoredApps.Shared.Payments/PaymentService.cs
+++ b/src/TailoredApps.Shared.Payments/PaymentService.cs
@@ -1,23 +1,37 @@
-using Microsoft.Extensions.DependencyInjection;
 using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Threading.Tasks;
+using Microsoft.Extensions.DependencyInjection;
 
 namespace TailoredApps.Shared.Payments
 {
+    /// <summary>
+    /// Default implementation of <see cref="IPaymentService"/>.
+    /// Resolves all registered <see cref="IPaymentProvider"/> instances at construction time
+    /// and routes calls to the appropriate provider by key.
+    /// </summary>
     public class PaymentService : IPaymentService
     {
         private readonly ICollection<IPaymentProvider> paymentService;
+
+        /// <summary>
+        /// Initializes a new instance of <see cref="PaymentService"/> and resolves
+        /// all registered <see cref="IPaymentProvider"/> instances from the service provider.
+        /// </summary>
+        /// <param name="serviceProvider">The application service provider.</param>
         public PaymentService(IServiceProvider serviceProvider)
         {
             this.paymentService = serviceProvider.GetServices<IPaymentProvider>().ToList();
         }
 
+        /// <inheritdoc/>
         public async Task<ICollection<PaymentProvider>> GetProviders()
         {
             return await Task.Run(() => paymentService.Select(x => new PaymentProvider { Id = x.Key, Name = x.Name }).ToList());
         }
+
+        /// <inheritdoc/>
         public async Task<ICollection<PaymentChannel>> GetChannels(string providerId, string currency)
         {
             var channels = await paymentService.Single(x => x.Key == providerId).GetPaymentChannels(currency);
@@ -32,18 +46,22 @@ public async Task<ICollection<PaymentChannel>> GetChannels(string providerId, st
 
             }).ToList();
         }
+
+        /// <inheritdoc/>
         public async Task<PaymentResponse> RegisterPayment(PaymentRequest request)
         {
             var provider = paymentService.Single(x => x.Key == request.PaymentProvider);
             return await provider.RequestPayment(request);
         }
 
+        /// <inheritdoc/>
         public async Task<PaymentResponse> GetStatus(string providerId, string paymentId)
         {
             var provider = paymentService.Single(x => x.Key == providerId);
             return await provider.GetStatus(paymentId);
         }
 
+        /// <inheritdoc/>
         public async Task<PaymentResponse> TransactionStatusChange(string providerId, TransactionStatusChangePayload payload)
         {
             payload.ProviderId = providerId;
diff --git a/src/TailoredApps.Shared.Payments/PaymentStatus.cs b/src/TailoredApps.Shared.Payments/PaymentStatus.cs
index 0c3da29..5dfe15d 100644
--- a/src/TailoredApps.Shared.Payments/PaymentStatus.cs
+++ b/src/TailoredApps.Shared.Payments/PaymentStatus.cs
@@ -1,10 +1,21 @@
-namespace TailoredApps.Shared.Payments
+namespace TailoredApps.Shared.Payments
 {
+    /// <summary>
+    /// Normalised payment status shared across all payment providers.
+    /// Provider-specific status strings are mapped to these values.
+    /// </summary>
     public enum PaymentStatusEnum
     {
+        /// <summary>The payment has been created but the payer has not yet completed the transaction.</summary>
         Created,
+
+        /// <summary>The payment is being processed by the provider and awaiting confirmation.</summary>
         Processing,
+
+        /// <summary>The payment was completed successfully.</summary>
         Finished,
+
+        /// <summary>The payment was rejected, cancelled, or failed.</summary>
         Rejected
     }
 }
diff --git a/src/TailoredApps.Shared.Payments/PaymentWebhookRequest.cs b/src/TailoredApps.Shared.Payments/PaymentWebhookRequest.cs
index c01f534..664b3dc 100644
--- a/src/TailoredApps.Shared.Payments/PaymentWebhookRequest.cs
+++ b/src/TailoredApps.Shared.Payments/PaymentWebhookRequest.cs
@@ -1,38 +1,39 @@
-using Microsoft.Extensions.Primitives;
-using System.Collections.Generic;
-
-namespace TailoredApps.Shared.Payments
-{
-    /// <summary>
-    /// Raw HTTP data received from a payment gateway's webhook/backchannel call.
-    /// Providers receive this unified structure and extract what they need.
-    /// </summary>
-    public class PaymentWebhookRequest
-    {
-        /// <summary>HTTP method (GET, POST, etc.).</summary>
-        public string HttpMethod { get; init; } = "POST";
-
-        /// <summary>Raw request body (JSON, form data, …). Null when the gateway sends no body.</summary>
-        public string? Body { get; init; }
-
-        /// <summary>Value of the Content-Type header.</summary>
-        public string? ContentType { get; init; }
-
-        /// <summary>Caller's remote IP address.</summary>
-        public string? RemoteIp { get; init; }
-
-        /// <summary>Full query string, e.g. "cmd=transStatusChanged&amp;args=TX123&amp;sign=abc".</summary>
-        public string? QueryString { get; init; }
-
-        /// <summary>
-        /// Parsed HTTP headers (e.g. Stripe-Signature, X-CashBill-Hmac).
-        /// Keys are treated case-insensitively.
-        /// </summary>
-        public Dictionary<string, StringValues> Headers { get; init; } = new();
-
-        /// <summary>
-        /// Parsed query-string parameters (e.g. cmd, args, sign for CashBill).
-        /// </summary>
-        public Dictionary<string, StringValues> Query { get; init; } = new();
-    }
-}
+#nullable enable
+using System.Collections.Generic;
+using Microsoft.Extensions.Primitives;
+
+namespace TailoredApps.Shared.Payments
+{
+    /// <summary>
+    /// Raw HTTP data received from a payment gateway's webhook/backchannel call.
+    /// Providers receive this unified structure and extract what they need.
+    /// </summary>
+    public class PaymentWebhookRequest
+    {
+        /// <summary>HTTP method (GET, POST, etc.).</summary>
+        public string HttpMethod { get; init; } = "POST";
+
+        /// <summary>Raw request body (JSON, form data, …). Null when the gateway sends no body.</summary>
+        public string? Body { get; init; }
+
+        /// <summary>Value of the Content-Type header.</summary>
+        public string? ContentType { get; init; }
+
+        /// <summary>Caller's remote IP address.</summary>
+        public string? RemoteIp { get; init; }
+
+        /// <summary>Full query string, e.g. "cmd=transStatusChanged&amp;args=TX123&amp;sign=abc".</summary>
+        public string? QueryString { get; init; }
+
+        /// <summary>
+        /// Parsed HTTP headers (e.g. Stripe-Signature, X-CashBill-Hmac).
+        /// Keys are treated case-insensitively.
+        /// </summary>
+        public Dictionary<string, StringValues> Headers { get; init; } = new();
+
+        /// <summary>
+        /// Parsed query-string parameters (e.g. cmd, args, sign for CashBill).
+        /// </summary>
+        public Dictionary<string, StringValues> Query { get; init; } = new();
+    }
+}
diff --git a/src/TailoredApps.Shared.Payments/PaymentWebhookResult.cs b/src/TailoredApps.Shared.Payments/PaymentWebhookResult.cs
index 3aed5b8..a8c3b58 100644
--- a/src/TailoredApps.Shared.Payments/PaymentWebhookResult.cs
+++ b/src/TailoredApps.Shared.Payments/PaymentWebhookResult.cs
@@ -1,44 +1,45 @@
-namespace TailoredApps.Shared.Payments
-{
-    /// <summary>
-    /// Result of processing an incoming payment gateway webhook.
-    /// </summary>
-    public class PaymentWebhookResult
-    {
-        /// <summary>True when the webhook was processed without an infrastructure error.</summary>
-        public bool Success { get; private init; }
-
-        /// <summary>
-        /// True when the event was valid but irrelevant and should be silently discarded
-        /// (e.g. Stripe <c>payment_method.attached</c> or future unknown events).
-        /// </summary>
-        public bool Ignored { get; private init; }
-
-        /// <summary>
-        /// Payment status resolved from the webhook.
-        /// Null when <see cref="Ignored"/> is true or processing failed.
-        /// </summary>
-        public PaymentResponse? PaymentResponse { get; private init; }
-
-        /// <summary>Human-readable error or ignore reason.</summary>
-        public string? ErrorMessage { get; private init; }
-
-        // ─── Factory methods ──────────────────────────────────────────────
-
-        /// <summary>Creates a successful result carrying a resolved payment response.</summary>
-        public static PaymentWebhookResult Ok(PaymentResponse response) =>
-            new() { Success = true, PaymentResponse = response };
-
-        /// <summary>
-        /// Creates a result indicating the event was received but should be silently ignored.
-        /// </summary>
-        /// <param name="reason">Optional human-readable reason (for logging).</param>
-        public static PaymentWebhookResult Ignore(string? reason = null) =>
-            new() { Success = true, Ignored = true, ErrorMessage = reason };
-
-        /// <summary>Creates a failed result (e.g. invalid signature, parse error).</summary>
-        /// <param name="error">Error description.</param>
-        public static PaymentWebhookResult Fail(string error) =>
-            new() { Success = false, ErrorMessage = error };
-    }
-}
+#nullable enable
+namespace TailoredApps.Shared.Payments
+{
+    /// <summary>
+    /// Result of processing an incoming payment gateway webhook.
+    /// </summary>
+    public class PaymentWebhookResult
+    {
+        /// <summary>True when the webhook was processed without an infrastructure error.</summary>
+        public bool Success { get; private init; }
+
+        /// <summary>
+        /// True when the event was valid but irrelevant and should be silently discarded
+        /// (e.g. Stripe <c>payment_method.attached</c> or future unknown events).
+        /// </summary>
+        public bool Ignored { get; private init; }
+
+        /// <summary>
+        /// Payment status resolved from the webhook.
+        /// Null when <see cref="Ignored"/> is true or processing failed.
+        /// </summary>
+        public PaymentResponse? PaymentResponse { get; private init; }
+
+        /// <summary>Human-readable error or ignore reason.</summary>
+        public string? ErrorMessage { get; private init; }
+
+        // ─── Factory methods ──────────────────────────────────────────────
+
+        /// <summary>Creates a successful result carrying a resolved payment response.</summary>
+        public static PaymentWebhookResult Ok(PaymentResponse response) =>
+            new() { Success = true, PaymentResponse = response };
+
+        /// <summary>
+        /// Creates a result indicating the event was received but should be silently ignored.
+        /// </summary>
+        /// <param name="reason">Optional human-readable reason (for logging).</param>
+        public static PaymentWebhookResult Ignore(string? reason = null) =>
+            new() { Success = true, Ignored = true, ErrorMessage = reason };
+
+        /// <summary>Creates a failed result (e.g. invalid signature, parse error).</summary>
+        /// <param name="error">Error description.</param>
+        public static PaymentWebhookResult Fail(string error) =>
+            new() { Success = false, ErrorMessage = error };
+    }
+}
diff --git a/src/TailoredApps.Shared.Payments/TransactionStatusChangePayload.cs b/src/TailoredApps.Shared.Payments/TransactionStatusChangePayload.cs
index 905dd74..4522ac6 100644
--- a/src/TailoredApps.Shared.Payments/TransactionStatusChangePayload.cs
+++ b/src/TailoredApps.Shared.Payments/TransactionStatusChangePayload.cs
@@ -1,12 +1,27 @@
-using Microsoft.Extensions.Primitives;
 using System.Collections.Generic;
+using Microsoft.Extensions.Primitives;
 
 namespace TailoredApps.Shared.Payments
 {
+    /// <summary>
+    /// Wraps the raw data received from a payment provider's back-channel
+    /// (status-change notification or legacy webhook).
+    /// </summary>
     public class TransactionStatusChangePayload
     {
+        /// <summary>
+        /// Gets or sets the key of the payment provider that sent this notification.
+        /// </summary>
         public string ProviderId { get; set; }
+
+        /// <summary>
+        /// Gets or sets the raw notification body (typically the deserialized HTTP request body).
+        /// </summary>
         public object Payload { get; set; }
+
+        /// <summary>
+        /// Gets or sets the query-string parameters received with the notification request.
+        /// </summary>
         public Dictionary<string, StringValues> QueryParameters { get; set; }
     }
 }
diff --git a/src/TailoredApps.Shared.Querying/IPagedResult.cs b/src/TailoredApps.Shared.Querying/IPagedResult.cs
index a310a1a..95abf6a 100644
--- a/src/TailoredApps.Shared.Querying/IPagedResult.cs
+++ b/src/TailoredApps.Shared.Querying/IPagedResult.cs
@@ -1,15 +1,15 @@
-using System.Collections.Generic;
-
-namespace TailoredApps.Shared.Querying
-{
-    /// <summary>Reprezentuje stronicowany wynik zapytania.</summary>
-    /// <typeparam name="T">Typ elementu kolekcji wyników.</typeparam>
-    public interface IPagedResult<T>
-    {
-        /// <summary>Kolekcja wyników na bieżącej stronie.</summary>
-        ICollection<T> Results { get; set; }
-
-        /// <summary>Łączna liczba wszystkich wyników (bez stronicowania).</summary>
-        int Count { get; set; }
-    }
-}
+using System.Collections.Generic;
+
+namespace TailoredApps.Shared.Querying
+{
+    /// <summary>Reprezentuje stronicowany wynik zapytania.</summary>
+    /// <typeparam name="T">Typ elementu kolekcji wyników.</typeparam>
+    public interface IPagedResult<T>
+    {
+        /// <summary>Kolekcja wyników na bieżącej stronie.</summary>
+        ICollection<T> Results { get; set; }
+
+        /// <summary>Łączna liczba wszystkich wyników (bez stronicowania).</summary>
+        int Count { get; set; }
+    }
+}
diff --git a/src/TailoredApps.Shared.Querying/PagedAndSortedQuery.cs b/src/TailoredApps.Shared.Querying/PagedAndSortedQuery.cs
index aefdad5..24cb617 100644
--- a/src/TailoredApps.Shared.Querying/PagedAndSortedQuery.cs
+++ b/src/TailoredApps.Shared.Querying/PagedAndSortedQuery.cs
@@ -1,112 +1,115 @@
-using System;
-
-namespace TailoredApps.Shared.Querying
-{
-    /// <summary>Bazowa klasa zapytania stronicowanego i sortowanego.</summary>
-    /// <typeparam name="TQuery">Typ filtru zapytania.</typeparam>
-    public abstract class PagedAndSortedQuery<TQuery> : IPagedAndSortedQuery<TQuery> where TQuery : QueryBase
-    {
-        /// <summary>Numer strony (1-based).</summary>
-        public int? Page { get; set; }
-
-        /// <summary>Liczba elementów na stronie.</summary>
-        public int? Count { get; set; }
-
-        /// <summary>Czy parametry stronicowania są podane.</summary>
-        public bool IsPagingSpecified => Page.HasValue && Count.HasValue;
-
-        /// <summary>Pole sortowania.</summary>
-        public string SortField { get; set; }
-
-        /// <summary>Kierunek sortowania.</summary>
-        public SortDirection? SortDir { get; set; }
-
-        /// <summary>Czy parametry sortowania są podane.</summary>
-        public bool IsSortingSpecified => !string.IsNullOrWhiteSpace(SortField) && SortDir.HasValue;
-
-        /// <summary>Obiekt filtra zapytania.</summary>
-        public TQuery Filter { get; set; }
-
-        /// <summary>Sprawdza, czy zapytanie jest sortowane po wskazanym polu.</summary>
-        /// <param name="fieldName">Nazwa pola do sprawdzenia.</param>
-        public bool IsSortBy(string fieldName) => string.Equals(SortField, fieldName, StringComparison.InvariantCultureIgnoreCase);
-    }
-
-    /// <summary>Interfejs zapytania stronicowanego i sortowanego.</summary>
-    /// <typeparam name="TQuery">Typ filtru zapytania.</typeparam>
-    public interface IPagedAndSortedQuery<TQuery> : IQuery<TQuery>, IQueryParameters where TQuery : QueryBase
-    {
-        /// <summary>Numer strony (1-based).</summary>
-        new int? Page { get; set; }
-
-        /// <summary>Liczba elementów na stronie.</summary>
-        new int? Count { get; set; }
-
-        /// <summary>Czy parametry stronicowania są podane.</summary>
-        new bool IsPagingSpecified { get; }
-
-        /// <summary>Pole sortowania.</summary>
-        new string SortField { get; set; }
-
-        /// <summary>Kierunek sortowania.</summary>
-        new SortDirection? SortDir { get; set; }
-
-        /// <summary>Czy parametry sortowania są podane.</summary>
-        new bool IsSortingSpecified { get; }
-
-        /// <summary>Obiekt filtra zapytania.</summary>
-        new TQuery Filter { get; set; }
-
-        /// <summary>Sprawdza, czy zapytanie jest sortowane po wskazanym polu.</summary>
-        bool IsSortBy(string fieldName);
-    }
-
-    /// <summary>Parametry stronicowania.</summary>
-    public interface IPagingParameters
-    {
-        /// <summary>Numer strony.</summary>
-        int? Page { get; }
-
-        /// <summary>Liczba elementów na stronie.</summary>
-        int? Count { get; }
-
-        /// <summary>Czy parametry stronicowania są podane.</summary>
-        bool IsPagingSpecified { get; }
-    }
-
-    /// <summary>Parametry sortowania.</summary>
-    public interface ISortingParameters
-    {
-        /// <summary>Pole sortowania.</summary>
-        string SortField { get; }
-
-        /// <summary>Kierunek sortowania.</summary>
-        SortDirection? SortDir { get; }
-
-        /// <summary>Czy parametry sortowania są podane.</summary>
-        bool IsSortingSpecified { get; }
-    }
-
-    /// <summary>Połączone parametry stronicowania i sortowania.</summary>
-    public interface IQueryParameters : IPagingParameters, ISortingParameters
-    {
-    }
-
-    /// <summary>Interfejs zapytania z filtrem.</summary>
-    /// <typeparam name="T">Typ filtru.</typeparam>
-    public interface IQuery<T>
-    {
-        /// <summary>Obiekt filtra zapytania.</summary>
-        T Filter { get; set; }
-    }
-
-    /// <summary>Interfejs stronicowanego żądania MediatR z filtrem i modelem odpowiedzi.</summary>
-    /// <typeparam name="TResponse">Typ odpowiedzi (musi implementować <see cref="IPagedResult{TModel}"/>).</typeparam>
-    /// <typeparam name="TQuery">Typ filtru zapytania.</typeparam>
-    /// <typeparam name="TModel">Typ elementu w wynikach.</typeparam>
-    public interface IPagedAndSortedRequest<TResponse, TQuery, TModel> : IPagedAndSortedQuery<TQuery>
-        where TQuery : QueryBase
-        where TResponse : IPagedResult<TModel>
-    {
-    }
-}
+using System;
+
+namespace TailoredApps.Shared.Querying
+{
+    /// <summary>Base class for a paged and sorted query.</summary>
+    /// <typeparam name="TQuery">The type of the query filter.</typeparam>
+    public abstract class PagedAndSortedQuery<TQuery> : IPagedAndSortedQuery<TQuery> where TQuery : QueryBase
+    {
+        /// <summary>Page number (1-based).</summary>
+        public int? Page { get; set; }
+
+        /// <summary>Number of items per page.</summary>
+        public int? Count { get; set; }
+
+        /// <summary>Indicates whether paging parameters are specified.</summary>
+        public bool IsPagingSpecified => Page.HasValue && Count.HasValue;
+
+        /// <summary>The field to sort by.</summary>
+        public string SortField { get; set; }
+
+        /// <summary>The sort direction.</summary>
+        public SortDirection? SortDir { get; set; }
+
+        /// <summary>Indicates whether sorting parameters are specified.</summary>
+        public bool IsSortingSpecified => !string.IsNullOrWhiteSpace(SortField) && SortDir.HasValue;
+
+        /// <summary>The query filter object.</summary>
+        public TQuery Filter { get; set; }
+
+        /// <summary>Determines whether the query is sorted by the specified field.</summary>
+        /// <param name="fieldName">The name of the field to check.</param>
+        /// <returns><c>true</c> if the query is sorted by <paramref name="fieldName"/>; otherwise, <c>false</c>.</returns>
+        public bool IsSortBy(string fieldName) => string.Equals(SortField, fieldName, StringComparison.InvariantCultureIgnoreCase);
+    }
+
+    /// <summary>Interface for a paged and sorted query.</summary>
+    /// <typeparam name="TQuery">The type of the query filter.</typeparam>
+    public interface IPagedAndSortedQuery<TQuery> : IQuery<TQuery>, IQueryParameters where TQuery : QueryBase
+    {
+        /// <summary>Page number (1-based).</summary>
+        new int? Page { get; set; }
+
+        /// <summary>Number of items per page.</summary>
+        new int? Count { get; set; }
+
+        /// <summary>Indicates whether paging parameters are specified.</summary>
+        new bool IsPagingSpecified { get; }
+
+        /// <summary>The field to sort by.</summary>
+        new string SortField { get; set; }
+
+        /// <summary>The sort direction.</summary>
+        new SortDirection? SortDir { get; set; }
+
+        /// <summary>Indicates whether sorting parameters are specified.</summary>
+        new bool IsSortingSpecified { get; }
+
+        /// <summary>The query filter object.</summary>
+        new TQuery Filter { get; set; }
+
+        /// <summary>Determines whether the query is sorted by the specified field.</summary>
+        /// <param name="fieldName">The name of the field to check.</param>
+        /// <returns><c>true</c> if the query is sorted by <paramref name="fieldName"/>; otherwise, <c>false</c>.</returns>
+        bool IsSortBy(string fieldName);
+    }
+
+    /// <summary>Paging parameters.</summary>
+    public interface IPagingParameters
+    {
+        /// <summary>Page number.</summary>
+        int? Page { get; }
+
+        /// <summary>Number of items per page.</summary>
+        int? Count { get; }
+
+        /// <summary>Indicates whether paging parameters are specified.</summary>
+        bool IsPagingSpecified { get; }
+    }
+
+    /// <summary>Sorting parameters.</summary>
+    public interface ISortingParameters
+    {
+        /// <summary>The field to sort by.</summary>
+        string SortField { get; }
+
+        /// <summary>The sort direction.</summary>
+        SortDirection? SortDir { get; }
+
+        /// <summary>Indicates whether sorting parameters are specified.</summary>
+        bool IsSortingSpecified { get; }
+    }
+
+    /// <summary>Combined paging and sorting parameters.</summary>
+    public interface IQueryParameters : IPagingParameters, ISortingParameters
+    {
+    }
+
+    /// <summary>Interface for a query with a filter object.</summary>
+    /// <typeparam name="T">The type of the filter.</typeparam>
+    public interface IQuery<T>
+    {
+        /// <summary>The query filter object.</summary>
+        T Filter { get; set; }
+    }
+
+    /// <summary>Interface for a paged MediatR request with a filter and a response model.</summary>
+    /// <typeparam name="TResponse">The type of the response (must implement <see cref="IPagedResult{TModel}"/>).</typeparam>
+    /// <typeparam name="TQuery">The type of the query filter.</typeparam>
+    /// <typeparam name="TModel">The type of the item in the result set.</typeparam>
+    public interface IPagedAndSortedRequest<TResponse, TQuery, TModel> : IPagedAndSortedQuery<TQuery>
+        where TQuery : QueryBase
+        where TResponse : IPagedResult<TModel>
+    {
+    }
+}
diff --git a/src/TailoredApps.Shared.Querying/QueryBase.cs b/src/TailoredApps.Shared.Querying/QueryBase.cs
index ca275fb..6fb12a3 100644
--- a/src/TailoredApps.Shared.Querying/QueryBase.cs
+++ b/src/TailoredApps.Shared.Querying/QueryBase.cs
@@ -1,7 +1,7 @@
-namespace TailoredApps.Shared.Querying
-{
-    /// <summary>Klasa bazowa dla filtrów zapytań stronicowanych i sortowanych.</summary>
-    public abstract class QueryBase
-    {
-    }
-}
+namespace TailoredApps.Shared.Querying
+{
+    /// <summary>Klasa bazowa dla filtrów zapytań stronicowanych i sortowanych.</summary>
+    public abstract class QueryBase
+    {
+    }
+}
diff --git a/src/TailoredApps.Shared.Querying/QueryMap.cs b/src/TailoredApps.Shared.Querying/QueryMap.cs
index 30ed449..b1797f4 100644
--- a/src/TailoredApps.Shared.Querying/QueryMap.cs
+++ b/src/TailoredApps.Shared.Querying/QueryMap.cs
@@ -1,28 +1,28 @@
-using System;
-using System.Linq.Expressions;
-
-namespace TailoredApps.Shared.Querying
-{
-    /// <summary>Mapowanie pola sortowania z modelu docelowego na pole źródłowe.</summary>
-    /// <typeparam name="TDestination">Typ modelu docelowego (DTO).</typeparam>
-    /// <typeparam name="TSource">Typ encji źródłowej.</typeparam>
-    public class QueryMap<TDestination, TSource>
-    {
-        /// <summary>
-        /// Inicjalizuje nowe mapowanie sortowania.
-        /// </summary>
-        /// <param name="destination">Wyrażenie na pole modelu docelowego.</param>
-        /// <param name="source">Wyrażenie na pole encji źródłowej.</param>
-        public QueryMap(Expression<Func<TDestination, object>> destination, Expression<Func<TSource, object>> source)
-        {
-            Source = source;
-            Destination = destination;
-        }
-
-        /// <summary>Wyrażenie wskazujące na pole encji źródłowej.</summary>
-        public Expression<Func<TSource, object>> Source { get; }
-
-        /// <summary>Wyrażenie wskazujące na pole modelu docelowego.</summary>
-        public Expression<Func<TDestination, object>> Destination { get; }
-    }
-}
+using System;
+using System.Linq.Expressions;
+
+namespace TailoredApps.Shared.Querying
+{
+    /// <summary>Maps a sort field from a destination model to a source entity field.</summary>
+    /// <typeparam name="TDestination">The type of the destination model (DTO).</typeparam>
+    /// <typeparam name="TSource">The type of the source entity.</typeparam>
+    public class QueryMap<TDestination, TSource>
+    {
+        /// <summary>
+        /// Initializes a new sort mapping.
+        /// </summary>
+        /// <param name="destination">An expression pointing to the destination model field.</param>
+        /// <param name="source">An expression pointing to the source entity field.</param>
+        public QueryMap(Expression<Func<TDestination, object>> destination, Expression<Func<TSource, object>> source)
+        {
+            Source = source;
+            Destination = destination;
+        }
+
+        /// <summary>An expression pointing to the source entity field.</summary>
+        public Expression<Func<TSource, object>> Source { get; }
+
+        /// <summary>An expression pointing to the destination model field.</summary>
+        public Expression<Func<TDestination, object>> Destination { get; }
+    }
+}
diff --git a/src/TailoredApps.Shared.Querying/SortDirection.cs b/src/TailoredApps.Shared.Querying/SortDirection.cs
index 58e1aa1..a384163 100644
--- a/src/TailoredApps.Shared.Querying/SortDirection.cs
+++ b/src/TailoredApps.Shared.Querying/SortDirection.cs
@@ -1,15 +1,15 @@
-namespace TailoredApps.Shared.Querying
-{
-    /// <summary>Kierunek sortowania wyników zapytania.</summary>
-    public enum SortDirection
-    {
-        /// <summary>Kierunek sortowania nie określony.</summary>
-        Undefined = 0,
-
-        /// <summary>Sortowanie rosnące.</summary>
-        Asc = 1,
-
-        /// <summary>Sortowanie malejące.</summary>
-        Desc = 2
-    }
-}
+namespace TailoredApps.Shared.Querying
+{
+    /// <summary>Kierunek sortowania wyników zapytania.</summary>
+    public enum SortDirection
+    {
+        /// <summary>Kierunek sortowania nie określony.</summary>
+        Undefined = 0,
+
+        /// <summary>Sortowanie rosnące.</summary>
+        Asc = 1,
+
+        /// <summary>Sortowanie malejące.</summary>
+        Desc = 2
+    }
+}
diff --git a/tests/TailoredApps.Shared.DateTime.Tests/UnitTest1.cs b/tests/TailoredApps.Shared.DateTime.Tests/UnitTest1.cs
index 883aff1..5536dc5 100644
--- a/tests/TailoredApps.Shared.DateTime.Tests/UnitTest1.cs
+++ b/tests/TailoredApps.Shared.DateTime.Tests/UnitTest1.cs
@@ -101,4 +101,4 @@ public void As_Library_User_When_Get_UtcTimeOfDay_I_Get_TimeSpan_In_Utc_Timezone
             Assert.InRange(dateFromProvider, dateTimeBeforeTest, dateTimeAfterTest);
         }
     }
-}
\ No newline at end of file
+}
diff --git a/tests/TailoredApps.Shared.DateTime.Tests/coverage/coverage.net10.0.json b/tests/TailoredApps.Shared.DateTime.Tests/coverage/coverage.net10.0.json
new file mode 100644
index 0000000..2fe2c4a
--- /dev/null
+++ b/tests/TailoredApps.Shared.DateTime.Tests/coverage/coverage.net10.0.json
@@ -0,0 +1,44 @@
+{
+  "TailoredApps.Shared.DateTime.dll": {
+    "/Users/private/.openclaw/workspace/SharedComponents/src/TailoredApps.Shared.DateTime/DateTimeProvider.cs": {
+      "TailoredApps.Shared.DateTime.DateTimeProvider": {
+        "System.DateTime TailoredApps.Shared.DateTime.DateTimeProvider::get_Now()": {
+          "Lines": {
+            "11": 1
+          },
+          "Branches": []
+        },
+        "System.DateTime TailoredApps.Shared.DateTime.DateTimeProvider::get_UtcNow()": {
+          "Lines": {
+            "16": 1
+          },
+          "Branches": []
+        },
+        "System.TimeSpan TailoredApps.Shared.DateTime.DateTimeProvider::get_TimeOfDay()": {
+          "Lines": {
+            "21": 2
+          },
+          "Branches": []
+        },
+        "System.TimeSpan TailoredApps.Shared.DateTime.DateTimeProvider::get_UtcTimeOfDaty()": {
+          "Lines": {
+            "26": 0
+          },
+          "Branches": []
+        },
+        "System.DateTime TailoredApps.Shared.DateTime.DateTimeProvider::get_Today()": {
+          "Lines": {
+            "31": 1
+          },
+          "Branches": []
+        },
+        "System.DateTime TailoredApps.Shared.DateTime.DateTimeProvider::get_UtcToday()": {
+          "Lines": {
+            "36": 1
+          },
+          "Branches": []
+        }
+      }
+    }
+  }
+}
\ No newline at end of file
diff --git a/tests/TailoredApps.Shared.Email.Tests/OutlookTest.cs b/tests/TailoredApps.Shared.Email.Tests/OutlookTest.cs
index 1c9ed92..1dd9ebc 100644
--- a/tests/TailoredApps.Shared.Email.Tests/OutlookTest.cs
+++ b/tests/TailoredApps.Shared.Email.Tests/OutlookTest.cs
@@ -1,16 +1,16 @@
+using System;
+using System.Threading.Tasks;
 using Microsoft.Extensions.Configuration;
-using Microsoft.Extensions.Hosting;
 using Microsoft.Extensions.DependencyInjection;
-using Xunit;
+using Microsoft.Extensions.Hosting;
 using TailoredApps.Shared.Email.Office365;
-using System.Threading.Tasks;
-using System;
+using Xunit;
 
 namespace TailoredApps.Shared.Email.Tests
 {
     public class OutlookTest
     {
-        [Fact(Skip ="setup config before test")]
+        [Fact(Skip = "setup config before test")]
         public async Task GetEmailTestFromOutlook()
         {
             var build = Host.CreateDefaultBuilder()
diff --git a/tests/TailoredApps.Shared.Email.Tests/SmtpTest.cs b/tests/TailoredApps.Shared.Email.Tests/SmtpTest.cs
index 07db497..95375e1 100644
--- a/tests/TailoredApps.Shared.Email.Tests/SmtpTest.cs
+++ b/tests/TailoredApps.Shared.Email.Tests/SmtpTest.cs
@@ -1,16 +1,16 @@
+using System;
+using System.Threading.Tasks;
 using Microsoft.Extensions.Configuration;
-using Microsoft.Extensions.Hosting;
 using Microsoft.Extensions.DependencyInjection;
-using Xunit;
+using Microsoft.Extensions.Hosting;
 using TailoredApps.Shared.Email.Office365;
-using System.Threading.Tasks;
-using System;
+using Xunit;
 
 namespace TailoredApps.Shared.Email.Tests
 {
     public class SmtpTest
     {
-        [Fact(Skip ="please do not send dumb data from build")]
+        [Fact(Skip = "please do not send dumb data from build")]
         public async Task SendEmailTestFromSmtp()
         {
             var build = Host.CreateDefaultBuilder()
@@ -20,7 +20,7 @@ public async Task SendEmailTestFromSmtp()
                       services.RegisterSmtpProvider();
                   }).Build();
             var provider = build.Services.GetService<IEmailProvider>();
-            await provider.SendMail("test@adress.pl","test email","test body", null);
+            await provider.SendMail("test@adress.pl", "test email", "test body", null);
         }
     }
 }
diff --git a/tests/TailoredApps.Shared.Email.Tests/coverage/coverage.net10.0.json b/tests/TailoredApps.Shared.Email.Tests/coverage/coverage.net10.0.json
new file mode 100644
index 0000000..7fe1ffc
--- /dev/null
+++ b/tests/TailoredApps.Shared.Email.Tests/coverage/coverage.net10.0.json
@@ -0,0 +1,972 @@
+{
+  "TailoredApps.Shared.Email.Models.dll": {
+    "/Users/private/.openclaw/workspace/SharedComponents/src/TailoredApps.Shared.Email.Models/MailMessage.cs": {
+      "TailoredApps.Shared.Email.Models.MailMessage": {
+        "System.String TailoredApps.Shared.Email.Models.MailMessage::get_Topic()": {
+          "Lines": {
+            "10": 0
+          },
+          "Branches": []
+        },
+        "System.String TailoredApps.Shared.Email.Models.MailMessage::get_Sender()": {
+          "Lines": {
+            "13": 0
+          },
+          "Branches": []
+        },
+        "System.String TailoredApps.Shared.Email.Models.MailMessage::get_Recipent()": {
+          "Lines": {
+            "16": 0
+          },
+          "Branches": []
+        },
+        "System.String TailoredApps.Shared.Email.Models.MailMessage::get_Copy()": {
+          "Lines": {
+            "19": 0
+          },
+          "Branches": []
+        },
+        "System.String TailoredApps.Shared.Email.Models.MailMessage::get_Body()": {
+          "Lines": {
+            "22": 0
+          },
+          "Branches": []
+        },
+        "System.String TailoredApps.Shared.Email.Models.MailMessage::get_HtmlBody()": {
+          "Lines": {
+            "25": 0
+          },
+          "Branches": []
+        },
+        "System.Collections.Generic.Dictionary`2<System.String,System.String> TailoredApps.Shared.Email.Models.MailMessage::get_Attachements()": {
+          "Lines": {
+            "28": 0
+          },
+          "Branches": []
+        },
+        "System.DateTimeOffset TailoredApps.Shared.Email.Models.MailMessage::get_Date()": {
+          "Lines": {
+            "31": 0
+          },
+          "Branches": []
+        }
+      }
+    }
+  },
+  "TailoredApps.Shared.Email.dll": {
+    "/Users/private/.openclaw/workspace/SharedComponents/src/TailoredApps.Shared.Email/EmailServiceToConsolleWritter.cs": {
+      "TailoredApps.Shared.Email.EmailServiceToConsolleWritter/<GetMail>d__0": {
+        "System.Void TailoredApps.Shared.Email.EmailServiceToConsolleWritter/<GetMail>d__0::MoveNext()": {
+          "Lines": {
+            "25": 0,
+            "26": 0
+          },
+          "Branches": []
+        }
+      },
+      "TailoredApps.Shared.Email.EmailServiceToConsolleWritter/<SendMail>d__1": {
+        "System.Void TailoredApps.Shared.Email.EmailServiceToConsolleWritter/<SendMail>d__1::MoveNext()": {
+          "Lines": {
+            "42": 0,
+            "43": 0,
+            "44": 0,
+            "45": 0
+          },
+          "Branches": []
+        }
+      }
+    },
+    "/Users/private/.openclaw/workspace/SharedComponents/src/TailoredApps.Shared.Email/SmtpEmailProvider.cs": {
+      "TailoredApps.Shared.Email.SmtpEmailProvider": {
+        "System.Void TailoredApps.Shared.Email.SmtpEmailProvider::.ctor(Microsoft.Extensions.Options.IOptions`1<TailoredApps.Shared.Email.SmtpEmailServiceOptions>)": {
+          "Lines": {
+            "25": 0,
+            "27": 0,
+            "28": 0
+          },
+          "Branches": []
+        }
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+          ]
+        }
+      },
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+        "System.Void TailoredApps.Shared.Email.Office365.Office365EmailProvider/<SendMail>d__7::MoveNext()": {
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+            "195": 0
+          },
+          "Branches": []
+        }
+      },
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+      "TailoredApps.Shared.Email.Office365.Office365EmailConfigureOptions": {
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+}
\ No newline at end of file
diff --git a/tests/TailoredApps.Shared.EntityFramework.Tests/UnitOfWork/Audit/EntityChangeTests.cs b/tests/TailoredApps.Shared.EntityFramework.Tests/UnitOfWork/Audit/EntityChangeTests.cs
index 114c8f6..f8ce126 100644
--- a/tests/TailoredApps.Shared.EntityFramework.Tests/UnitOfWork/Audit/EntityChangeTests.cs
+++ b/tests/TailoredApps.Shared.EntityFramework.Tests/UnitOfWork/Audit/EntityChangeTests.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using TailoredApps.Shared.EntityFramework.Interfaces.Audit;
 using TailoredApps.Shared.EntityFramework.Tests.UnitOfWork.Audit.Utils;
 using Xunit;
diff --git a/tests/TailoredApps.Shared.EntityFramework.Tests/UnitOfWork/Audit/EntityStateTransitionTests.cs b/tests/TailoredApps.Shared.EntityFramework.Tests/UnitOfWork/Audit/EntityStateTransitionTests.cs
index 061390a..66094c1 100644
--- a/tests/TailoredApps.Shared.EntityFramework.Tests/UnitOfWork/Audit/EntityStateTransitionTests.cs
+++ b/tests/TailoredApps.Shared.EntityFramework.Tests/UnitOfWork/Audit/EntityStateTransitionTests.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using TailoredApps.Shared.EntityFramework.Interfaces.Audit;
diff --git a/tests/TailoredApps.Shared.EntityFramework.Tests/UnitOfWork/Audit/InternalEntityChangeTests.cs b/tests/TailoredApps.Shared.EntityFramework.Tests/UnitOfWork/Audit/InternalEntityChangeTests.cs
index e091188..22a828b 100644
--- a/tests/TailoredApps.Shared.EntityFramework.Tests/UnitOfWork/Audit/InternalEntityChangeTests.cs
+++ b/tests/TailoredApps.Shared.EntityFramework.Tests/UnitOfWork/Audit/InternalEntityChangeTests.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using TailoredApps.Shared.EntityFramework.Interfaces.Audit;
 using TailoredApps.Shared.EntityFramework.Tests.UnitOfWork.Audit.Utils;
 using TailoredApps.Shared.EntityFramework.UnitOfWork.Audit.Extensions;
diff --git a/tests/TailoredApps.Shared.EntityFramework.Tests/UnitOfWork/Audit/UnitOfWorkAuditConfigurationTests.cs b/tests/TailoredApps.Shared.EntityFramework.Tests/UnitOfWork/Audit/UnitOfWorkAuditConfigurationTests.cs
index 69170e5..39368e9 100644
--- a/tests/TailoredApps.Shared.EntityFramework.Tests/UnitOfWork/Audit/UnitOfWorkAuditConfigurationTests.cs
+++ b/tests/TailoredApps.Shared.EntityFramework.Tests/UnitOfWork/Audit/UnitOfWorkAuditConfigurationTests.cs
@@ -1,8 +1,8 @@
-using Microsoft.EntityFrameworkCore;
-using Microsoft.Extensions.DependencyInjection;
 using System;
 using System.Collections.Generic;
 using System.Linq;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.Extensions.DependencyInjection;
 using TailoredApps.Shared.EntityFramework.Interfaces.Audit;
 using TailoredApps.Shared.EntityFramework.Interfaces.UnitOfWork;
 using TailoredApps.Shared.EntityFramework.Tests.UnitOfWork.Audit.Utils;
diff --git a/tests/TailoredApps.Shared.EntityFramework.Tests/UnitOfWork/Audit/UnitOfWorkAuditContextTests.cs b/tests/TailoredApps.Shared.EntityFramework.Tests/UnitOfWork/Audit/UnitOfWorkAuditContextTests.cs
index bf2a6d0..6437a65 100644
--- a/tests/TailoredApps.Shared.EntityFramework.Tests/UnitOfWork/Audit/UnitOfWorkAuditContextTests.cs
+++ b/tests/TailoredApps.Shared.EntityFramework.Tests/UnitOfWork/Audit/UnitOfWorkAuditContextTests.cs
@@ -1,7 +1,7 @@
-
+
+using System.Collections.Generic;
 using AutoMoqCore;
 using Moq;
-using System.Collections.Generic;
 using TailoredApps.Shared.EntityFramework.Interfaces.Audit;
 using TailoredApps.Shared.EntityFramework.Tests.UnitOfWork.Audit.Utils;
 using TailoredApps.Shared.EntityFramework.UnitOfWork.Audit;
diff --git a/tests/TailoredApps.Shared.EntityFramework.Tests/UnitOfWork/Audit/Utils/AuditorForTests.cs b/tests/TailoredApps.Shared.EntityFramework.Tests/UnitOfWork/Audit/Utils/AuditorForTests.cs
index c573502..269dc78 100644
--- a/tests/TailoredApps.Shared.EntityFramework.Tests/UnitOfWork/Audit/Utils/AuditorForTests.cs
+++ b/tests/TailoredApps.Shared.EntityFramework.Tests/UnitOfWork/Audit/Utils/AuditorForTests.cs
@@ -1,4 +1,4 @@
-using System.Collections.Generic;
+using System.Collections.Generic;
 using TailoredApps.Shared.EntityFramework.Interfaces.Audit;
 
 namespace TailoredApps.Shared.EntityFramework.Tests.UnitOfWork.Audit.Utils
diff --git a/tests/TailoredApps.Shared.EntityFramework.Tests/UnitOfWork/Audit/Utils/Entities.cs b/tests/TailoredApps.Shared.EntityFramework.Tests/UnitOfWork/Audit/Utils/Entities.cs
index 37edec9..61b74ff 100644
--- a/tests/TailoredApps.Shared.EntityFramework.Tests/UnitOfWork/Audit/Utils/Entities.cs
+++ b/tests/TailoredApps.Shared.EntityFramework.Tests/UnitOfWork/Audit/Utils/Entities.cs
@@ -1,4 +1,4 @@
-namespace TailoredApps.Shared.EntityFramework.Tests.UnitOfWork.Audit.Utils
+namespace TailoredApps.Shared.EntityFramework.Tests.UnitOfWork.Audit.Utils
 {
     public class ExampleEntity
     {
diff --git a/tests/TailoredApps.Shared.EntityFramework.Tests/UnitOfWork/Audit/Utils/TestingHelpers.cs b/tests/TailoredApps.Shared.EntityFramework.Tests/UnitOfWork/Audit/Utils/TestingHelpers.cs
index 1229f73..7735d3f 100644
--- a/tests/TailoredApps.Shared.EntityFramework.Tests/UnitOfWork/Audit/Utils/TestingHelpers.cs
+++ b/tests/TailoredApps.Shared.EntityFramework.Tests/UnitOfWork/Audit/Utils/TestingHelpers.cs
@@ -1,4 +1,4 @@
-using Moq;
+using Moq;
 using TailoredApps.Shared.EntityFramework.Interfaces.Audit;
 using TailoredApps.Shared.EntityFramework.UnitOfWork.Audit.Changes;
 
diff --git a/tests/TailoredApps.Shared.EntityFramework.Tests/UnitOfWork/Hooks/UnitOfWorkHooksManagerTests.cs b/tests/TailoredApps.Shared.EntityFramework.Tests/UnitOfWork/Hooks/UnitOfWorkHooksManagerTests.cs
index 25c18bd..2ed2c18 100644
--- a/tests/TailoredApps.Shared.EntityFramework.Tests/UnitOfWork/Hooks/UnitOfWorkHooksManagerTests.cs
+++ b/tests/TailoredApps.Shared.EntityFramework.Tests/UnitOfWork/Hooks/UnitOfWorkHooksManagerTests.cs
@@ -1,5 +1,5 @@
-using Moq;
 using System.Collections.Generic;
+using Moq;
 using TailoredApps.Shared.EntityFramework.Interfaces.UnitOfWork;
 using TailoredApps.Shared.EntityFramework.UnitOfWork;
 using Xunit;
diff --git a/tests/TailoredApps.Shared.EntityFramework.Tests/UnitOfWork/Hooks/UnitOfWorkTests.cs b/tests/TailoredApps.Shared.EntityFramework.Tests/UnitOfWork/Hooks/UnitOfWorkTests.cs
index 836dd12..ab7f84a 100644
--- a/tests/TailoredApps.Shared.EntityFramework.Tests/UnitOfWork/Hooks/UnitOfWorkTests.cs
+++ b/tests/TailoredApps.Shared.EntityFramework.Tests/UnitOfWork/Hooks/UnitOfWorkTests.cs
@@ -1,8 +1,8 @@
-using AutoMoqCore;
-using Moq;
 using System.Data;
 using System.Data.Common;
 using System.Threading.Tasks;
+using AutoMoqCore;
+using Moq;
 using TailoredApps.Shared.EntityFramework.Interfaces.UnitOfWork;
 using TailoredApps.Shared.EntityFramework.Tests.UnitOfWork.Utils;
 using TailoredApps.Shared.EntityFramework.UnitOfWork;
diff --git a/tests/TailoredApps.Shared.EntityFramework.Tests/UnitOfWork/Utils/InMemoryDbContext.cs b/tests/TailoredApps.Shared.EntityFramework.Tests/UnitOfWork/Utils/InMemoryDbContext.cs
index 4f4c59b..c1e81d7 100644
--- a/tests/TailoredApps.Shared.EntityFramework.Tests/UnitOfWork/Utils/InMemoryDbContext.cs
+++ b/tests/TailoredApps.Shared.EntityFramework.Tests/UnitOfWork/Utils/InMemoryDbContext.cs
@@ -1,7 +1,7 @@
-using Microsoft.EntityFrameworkCore;
+using System;
+using Microsoft.EntityFrameworkCore;
 using Microsoft.EntityFrameworkCore.Infrastructure;
 using Microsoft.Extensions.DependencyInjection;
-using System;
 
 namespace TailoredApps.Shared.EntityFramework.Tests.UnitOfWork.Utils
 {
diff --git a/tests/TailoredApps.Shared.EntityFramework.Tests/coverage/coverage.net10.0.json b/tests/TailoredApps.Shared.EntityFramework.Tests/coverage/coverage.net10.0.json
new file mode 100644
index 0000000..aa8a1a6
--- /dev/null
+++ b/tests/TailoredApps.Shared.EntityFramework.Tests/coverage/coverage.net10.0.json
@@ -0,0 +1,2638 @@
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diff --git a/tests/TailoredApps.Shared.MediatR.ML.Tests/MLEngineTests.cs b/tests/TailoredApps.Shared.MediatR.ML.Tests/MLEngineTests.cs
index d497823..1ee757b 100644
--- a/tests/TailoredApps.Shared.MediatR.ML.Tests/MLEngineTests.cs
+++ b/tests/TailoredApps.Shared.MediatR.ML.Tests/MLEngineTests.cs
@@ -1,12 +1,12 @@
-using MediatR;
-using Microsoft.Extensions.Configuration;
-using Microsoft.Extensions.DependencyInjection;
-using Microsoft.Extensions.Hosting;
-using Microsoft.Extensions.ML;
 using System.IO;
 using System.Linq;
 using System.Reflection;
 using System.Threading.Tasks;
+using MediatR;
+using Microsoft.Extensions.Configuration;
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Hosting;
+using Microsoft.Extensions.ML;
 using TailoredApps.Shared.MediatR.ImageClassification.Domain.DataModel.Message.Commands;
 using TailoredApps.Shared.MediatR.ImageClassification.Infrastructure;
 using TailoredApps.Shared.MediatR.ImageClassification.Interfaces.Domain.Models;
@@ -36,14 +36,14 @@ public async Task CanLearnAndVerifyModel()
                      {
                          services.RegisterMachineLearningModel<InMemoryImageData, ImagePredictionScore>(builder =>
                          {
-                            // builder.FromFile(modelName);
+                             // builder.FromFile(modelName);
                          });
                      });
                  }).Build();
             var mediatoR = hostCreateModel.Services.GetService<IMediator>();
             Assert.NotNull(mediatoR);
 
-            var response =await mediatoR.Send(new TrainImageClassificationModel { Source= "D:\\WORK\\SharedComponents\\tests\\TailoredApps.Shared.MediatR.ML.Tests\\TestData\\ImageClassification\\LearningSets", ModelDestFolderPath=modelName });
+            var response = await mediatoR.Send(new TrainImageClassificationModel { Source = "D:\\WORK\\SharedComponents\\tests\\TailoredApps.Shared.MediatR.ML.Tests\\TestData\\ImageClassification\\LearningSets", ModelDestFolderPath = modelName });
             Assert.NotNull(response);
 
             var hostVerify = Host.CreateDefaultBuilder()
@@ -59,7 +59,7 @@ public async Task CanLearnAndVerifyModel()
                      {
                          services.RegisterMachineLearningModel<InMemoryImageData, ImagePredictionScore>(builder =>
                          {
-                            builder.FromFile(modelName);
+                             builder.FromFile(modelName);
                          });
                      });
                  }).Build();
@@ -67,7 +67,7 @@ public async Task CanLearnAndVerifyModel()
             var mediatorVerify = hostVerify.Services.GetService<IMediator>();
             Assert.NotNull(mediatorVerify);
             var testFileRed = File.OpenRead("D:\\WORK\\SharedComponents\\tests\\TailoredApps.Shared.MediatR.ML.Tests\\TestData\\ImageClassification\\TestImages\\testred.png");
-            var responseClassification = await mediatorVerify.Send(new ClassifyImage { FileByteArray = ReadFully(testFileRed), FileName= "testred.png" });
+            var responseClassification = await mediatorVerify.Send(new ClassifyImage { FileByteArray = ReadFully(testFileRed), FileName = "testred.png" });
             Assert.NotNull(responseClassification);
 
         }
diff --git a/tests/TailoredApps.Shared.MediatR.ML.Tests/coverage/coverage.net10.0.json b/tests/TailoredApps.Shared.MediatR.ML.Tests/coverage/coverage.net10.0.json
new file mode 100644
index 0000000..53b3e59
--- /dev/null
+++ b/tests/TailoredApps.Shared.MediatR.ML.Tests/coverage/coverage.net10.0.json
@@ -0,0 +1,1553 @@
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+}
\ No newline at end of file
diff --git a/tests/TailoredApps.Shared.Payments.Tests/CashBillSignVerificationTests.cs b/tests/TailoredApps.Shared.Payments.Tests/CashBillSignVerificationTests.cs
index f90ad08..0c6debd 100644
--- a/tests/TailoredApps.Shared.Payments.Tests/CashBillSignVerificationTests.cs
+++ b/tests/TailoredApps.Shared.Payments.Tests/CashBillSignVerificationTests.cs
@@ -1,103 +1,103 @@
-using System;
-using System.Collections.Generic;
-using System.Security.Cryptography;
-using System.Text;
-using System.Threading.Tasks;
-using Microsoft.Extensions.Configuration;
-using Microsoft.Extensions.DependencyInjection;
-using Microsoft.Extensions.Hosting;
-using TailoredApps.Shared.Payments.Provider.CashBill;
-using TailoredApps.Shared.Payments.Provider.CashBill.Models;
-using Xunit;
-
-namespace TailoredApps.Shared.Payments.Tests;
-
-/// <summary>
-/// Testy weryfikacji podpisu (sign) w notyfikacjach CashBill backchannel.
-///
-/// BUG: GetSignForNotificationService używa SHA1, ale CashBill wysyła MD5.
-/// Formuła: MD5(cmd + args + shopSecretPhrase)
-///
-/// Weryfikacja empiryczna na podstawie rzeczywistych danych z zalejpajaca.pl
-/// (webhook logs 2026-03-20).
-/// </summary>
-public class CashBillSignVerificationTests
-{
-    private static IHost BuildHost() =>
-        Host.CreateDefaultBuilder()
-            .ConfigureAppConfiguration(a => a.AddJsonFile("appsettings.json"))
-            .ConfigureServices((_, services) =>
-            {
-                services.RegisterCashbillProvider();
-                services.AddPayments().RegisterPaymentProvider<CashBillProvider>();
-            })
-            .Build();
-
-    // --- dane z rzeczywistych webhook logów zalejpajaca.pl (2026-03-20) ---
-    // Formuła CashBill: MD5(cmd + args + shopSecretPhrase)
-    // Secret zalejpajaca.pl = 56d10c388c87f31d92023f6e7717ea18
-    public static IEnumerable<object[]> RealWebhookData =>
-    [
-        // cmd, transactionId, sign (MD5 z sekretem zalejpajaca.pl)
-        ["transactionStatusChanged", "TEST_b3p7espa", "803ce7dd61a8f7bee235259a54a44867"],
-        ["transactionStatusChanged", "TEST_b3p7estn", "88eb946900ea479c9f051790b6220dd6"],
-    ];
-
-    // --- dane z appsettings testowych (secret = 1c5dd47b1dd0e11ffc3e2b1595c3dd67) ---
-    public static IEnumerable<object[]> TestSecretData =>
-    [
-        // ten sam format — wygenerowany przez CashBill test env
-        ["transactionStatusChanged", "TEST_6f7zsddbw", "2050dc9f7149ef52d07f621d7d0d41b6"],
-    ];
-
-    /// <summary>
-    /// Dowodzi że GetSignForNotificationService oblicza MD5 (a nie SHA1).
-    /// Test powinien przejść PO naprawie bugu w CashbillServiceCaller.
-    /// </summary>
-    [Theory]
-    [MemberData(nameof(TestSecretData))]
-    public async Task GetSignForNotificationService_ShouldReturnMd5_MatchesKnownCashBillWebhookSign(
-        string cmd, string transactionId, string expectedSign)
-    {
-        var host = BuildHost();
-        var caller = host.Services.GetRequiredService<ICashbillServiceCaller>();
-
-        var request = new TransactionStatusChanged
-        {
-            Command       = cmd,
-            TransactionId = transactionId,
-            Sign          = expectedSign,
-        };
-
-        var computedSign = await caller.GetSignForNotificationService(request);
-
-        Assert.Equal(expectedSign, computedSign);
-    }
-
-    /// <summary>
-    /// Dokumentuje buga: SHA1 NIE pasuje do sign wysyłanego przez CashBill.
-    /// Poprawny algorytm to MD5.
-    /// </summary>
-    [Theory]
-    [MemberData(nameof(TestSecretData))]
-    public async Task GetSignForNotificationService_SHA1WouldFail_MustBeMD5(
-        string cmd, string transactionId, string cashBillSign)
-    {
-        // Oblicz SHA1 ręcznie (stara/błędna implementacja)
-        var input = cmd + transactionId + "1c5dd47b1dd0e11ffc3e2b1595c3dd67"; // test secret
-        using var sha1 = System.Security.Cryptography.SHA1.Create();
-        var sha1Bytes = sha1.ComputeHash(System.Text.Encoding.UTF8.GetBytes(input));
-        var sha1Hash  = BitConverter.ToString(sha1Bytes).Replace("-", "").ToLower();
-
-        // Oblicz MD5 (poprawna implementacja)
-        using var md5 = System.Security.Cryptography.MD5.Create();
-        var md5Bytes = md5.ComputeHash(System.Text.Encoding.UTF8.GetBytes(input));
-        var md5Hash  = BitConverter.ToString(md5Bytes).Replace("-", "").ToLower();
-
-        // SHA1 NIE pasuje do tego co CashBill wysyła
-        Assert.NotEqual(cashBillSign, sha1Hash);
-
-        // MD5 pasuje
-        Assert.Equal(cashBillSign, md5Hash);
-    }
-}
+using System;
+using System.Collections.Generic;
+using System.Security.Cryptography;
+using System.Text;
+using System.Threading.Tasks;
+using Microsoft.Extensions.Configuration;
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Hosting;
+using TailoredApps.Shared.Payments.Provider.CashBill;
+using TailoredApps.Shared.Payments.Provider.CashBill.Models;
+using Xunit;
+
+namespace TailoredApps.Shared.Payments.Tests;
+
+/// <summary>
+/// Testy weryfikacji podpisu (sign) w notyfikacjach CashBill backchannel.
+///
+/// BUG: GetSignForNotificationService używa SHA1, ale CashBill wysyła MD5.
+/// Formuła: MD5(cmd + args + shopSecretPhrase)
+///
+/// Weryfikacja empiryczna na podstawie rzeczywistych danych z zalejpajaca.pl
+/// (webhook logs 2026-03-20).
+/// </summary>
+public class CashBillSignVerificationTests
+{
+    private static IHost BuildHost() =>
+        Host.CreateDefaultBuilder()
+            .ConfigureAppConfiguration(a => a.AddJsonFile("appsettings.json"))
+            .ConfigureServices((_, services) =>
+            {
+                services.RegisterCashbillProvider();
+                services.AddPayments().RegisterPaymentProvider<CashBillProvider>();
+            })
+            .Build();
+
+    // --- dane z rzeczywistych webhook logów zalejpajaca.pl (2026-03-20) ---
+    // Formuła CashBill: MD5(cmd + args + shopSecretPhrase)
+    // Secret zalejpajaca.pl = 56d10c388c87f31d92023f6e7717ea18
+    public static IEnumerable<object[]> RealWebhookData =>
+    [
+        // cmd, transactionId, sign (MD5 z sekretem zalejpajaca.pl)
+        ["transactionStatusChanged", "TEST_b3p7espa", "803ce7dd61a8f7bee235259a54a44867"],
+        ["transactionStatusChanged", "TEST_b3p7estn", "88eb946900ea479c9f051790b6220dd6"],
+    ];
+
+    // --- dane z appsettings testowych (secret = 1c5dd47b1dd0e11ffc3e2b1595c3dd67) ---
+    public static IEnumerable<object[]> TestSecretData =>
+    [
+        // ten sam format — wygenerowany przez CashBill test env
+        ["transactionStatusChanged", "TEST_6f7zsddbw", "2050dc9f7149ef52d07f621d7d0d41b6"],
+    ];
+
+    /// <summary>
+    /// Dowodzi że GetSignForNotificationService oblicza MD5 (a nie SHA1).
+    /// Test powinien przejść PO naprawie bugu w CashbillServiceCaller.
+    /// </summary>
+    [Theory]
+    [MemberData(nameof(TestSecretData))]
+    public async Task GetSignForNotificationService_ShouldReturnMd5_MatchesKnownCashBillWebhookSign(
+        string cmd, string transactionId, string expectedSign)
+    {
+        var host = BuildHost();
+        var caller = host.Services.GetRequiredService<ICashbillServiceCaller>();
+
+        var request = new TransactionStatusChanged
+        {
+            Command = cmd,
+            TransactionId = transactionId,
+            Sign = expectedSign,
+        };
+
+        var computedSign = await caller.GetSignForNotificationService(request);
+
+        Assert.Equal(expectedSign, computedSign);
+    }
+
+    /// <summary>
+    /// Dokumentuje buga: SHA1 NIE pasuje do sign wysyłanego przez CashBill.
+    /// Poprawny algorytm to MD5.
+    /// </summary>
+    [Theory]
+    [MemberData(nameof(TestSecretData))]
+    public async Task GetSignForNotificationService_SHA1WouldFail_MustBeMD5(
+        string cmd, string transactionId, string cashBillSign)
+    {
+        // Oblicz SHA1 ręcznie (stara/błędna implementacja)
+        var input = cmd + transactionId + "1c5dd47b1dd0e11ffc3e2b1595c3dd67"; // test secret
+        using var sha1 = System.Security.Cryptography.SHA1.Create();
+        var sha1Bytes = sha1.ComputeHash(System.Text.Encoding.UTF8.GetBytes(input));
+        var sha1Hash = BitConverter.ToString(sha1Bytes).Replace("-", "").ToLower();
+
+        // Oblicz MD5 (poprawna implementacja)
+        using var md5 = System.Security.Cryptography.MD5.Create();
+        var md5Bytes = md5.ComputeHash(System.Text.Encoding.UTF8.GetBytes(input));
+        var md5Hash = BitConverter.ToString(md5Bytes).Replace("-", "").ToLower();
+
+        // SHA1 NIE pasuje do tego co CashBill wysyła
+        Assert.NotEqual(cashBillSign, sha1Hash);
+
+        // MD5 pasuje
+        Assert.Equal(cashBillSign, md5Hash);
+    }
+}
diff --git a/tests/TailoredApps.Shared.Payments.Tests/ExtraCoverageTests.cs b/tests/TailoredApps.Shared.Payments.Tests/ExtraCoverageTests.cs
new file mode 100644
index 0000000..41aa461
--- /dev/null
+++ b/tests/TailoredApps.Shared.Payments.Tests/ExtraCoverageTests.cs
@@ -0,0 +1,1158 @@
+#nullable enable
+using System.Collections.Generic;
+using System.Threading.Tasks;
+using global::Stripe;
+using global::Stripe.Checkout;
+using Microsoft.Extensions.Options;
+using Microsoft.Extensions.Primitives;
+using Moq;
+using TailoredApps.Shared.Payments;
+using TailoredApps.Shared.Payments.Provider.Adyen;
+using TailoredApps.Shared.Payments.Provider.HotPay;
+using TailoredApps.Shared.Payments.Provider.PayNow;
+using TailoredApps.Shared.Payments.Provider.PayU;
+using TailoredApps.Shared.Payments.Provider.Przelewy24;
+using TailoredApps.Shared.Payments.Provider.Revolut;
+using TailoredApps.Shared.Payments.Provider.Stripe;
+using TailoredApps.Shared.Payments.Provider.Tpay;
+using Xunit;
+
+namespace TailoredApps.Shared.Payments.Tests;
+
+// ────────────────────────────────────────────────────────────────────────────
+// Stripe Provider — unit tests (mocked IStripeServiceCaller)
+// ────────────────────────────────────────────────────────────────────────────
+
+/// <summary>Unit testy dla StripeProvider z mockowanym IStripeServiceCaller.</summary>
+public class StripeProviderUnitTests
+{
+    private static StripeProvider Build(IStripeServiceCaller caller) => new(caller);
+
+    private static Session MakeSession(string id, string status, string paymentStatus, string url = "https://checkout.stripe.com/pay/test")
+        => new() { Id = id, Status = status, PaymentStatus = paymentStatus, Url = url };
+
+    private static Event MakeEvent(string type, Session? sessionData = null)
+        => new()
+        {
+            Type = type,
+            Data = new EventData
+            {
+                Object = sessionData ?? new Session { Id = "cs_test", Status = "complete", PaymentStatus = "paid" },
+            },
+        };
+
+    // ─── Properties ────────────────────────────────────────────────────────
+
+    [Fact]
+    public void Key_IsStripe() => Assert.Equal("Stripe", Build(Mock.Of<IStripeServiceCaller>()).Key);
+
+    [Fact]
+    public void Name_IsStripe() => Assert.Equal("Stripe", Build(Mock.Of<IStripeServiceCaller>()).Name);
+
+    [Fact]
+    public void Description_IsNotEmpty() => Assert.NotEmpty(Build(Mock.Of<IStripeServiceCaller>()).Description);
+
+    [Fact]
+    public void Url_IsStripeUrl() => Assert.Contains("stripe.com", Build(Mock.Of<IStripeServiceCaller>()).Url);
+
+    // ─── GetPaymentChannels ─────────────────────────────────────────────────
+
+    [Fact]
+    public async Task GetChannels_PLN_ContainsBlikP24Card()
+    {
+        var channels = await Build(Mock.Of<IStripeServiceCaller>()).GetPaymentChannels("PLN");
+        Assert.Contains(channels, c => c.Id == "blik");
+        Assert.Contains(channels, c => c.Id == "p24");
+        Assert.Contains(channels, c => c.Id == "card");
+        Assert.Equal(3, channels.Count);
+    }
+
+    [Fact]
+    public async Task GetChannels_pln_lowercase_ContainsBlikP24Card()
+    {
+        var channels = await Build(Mock.Of<IStripeServiceCaller>()).GetPaymentChannels("pln");
+        Assert.Contains(channels, c => c.Id == "blik");
+    }
+
+    [Fact]
+    public async Task GetChannels_EUR_ContainsCardAndSepa()
+    {
+        var channels = await Build(Mock.Of<IStripeServiceCaller>()).GetPaymentChannels("EUR");
+        Assert.Contains(channels, c => c.Id == "card");
+        Assert.Contains(channels, c => c.Id == "sepa_debit");
+        Assert.Equal(2, channels.Count);
+    }
+
+    [Fact]
+    public async Task GetChannels_USD_ContainsOnlyCard()
+    {
+        var channels = await Build(Mock.Of<IStripeServiceCaller>()).GetPaymentChannels("USD");
+        Assert.Single(channels);
+        Assert.Contains(channels, c => c.Id == "card");
+    }
+
+    [Fact]
+    public async Task GetChannels_GBP_FallbackContainsCard()
+    {
+        var channels = await Build(Mock.Of<IStripeServiceCaller>()).GetPaymentChannels("GBP");
+        Assert.Single(channels);
+        Assert.Contains(channels, c => c.Id == "card");
+    }
+
+    // ─── RequestPayment ─────────────────────────────────────────────────────
+
+    [Fact]
+    public async Task RequestPayment_Success_ReturnsCreated()
+    {
+        var session = MakeSession("cs_test_123", "open", "unpaid", "https://checkout.stripe.com/pay/cs_test_123");
+        var mock = new Mock<IStripeServiceCaller>();
+        mock.Setup(m => m.CreateCheckoutSessionAsync(It.IsAny<PaymentRequest>()))
+            .ReturnsAsync(session);
+
+        var result = await Build(mock.Object).RequestPayment(new PaymentRequest
+        {
+            PaymentProvider = "Stripe",
+            PaymentChannel = "card",
+            PaymentModel = PaymentModel.OneTime,
+            Title = "Test",
+            Currency = "PLN",
+            Amount = 9.99m,
+            Email = "test@example.com",
+        });
+
+        Assert.Equal(PaymentStatusEnum.Created, result.PaymentStatus);
+        Assert.Equal("cs_test_123", result.PaymentUniqueId);
+        Assert.Equal("https://checkout.stripe.com/pay/cs_test_123", result.RedirectUrl);
+    }
+
+    // ─── GetStatus ──────────────────────────────────────────────────────────
+
+    [Fact]
+    public async Task GetStatus_Complete_Paid_ReturnsFinished()
+    {
+        var session = MakeSession("cs_1", "complete", "paid");
+        var mock = new Mock<IStripeServiceCaller>();
+        mock.Setup(m => m.GetCheckoutSessionAsync("cs_1")).ReturnsAsync(session);
+
+        var result = await Build(mock.Object).GetStatus("cs_1");
+        Assert.Equal(PaymentStatusEnum.Finished, result.PaymentStatus);
+        Assert.Equal("cs_1", result.PaymentUniqueId);
+    }
+
+    [Fact]
+    public async Task GetStatus_Complete_Unpaid_ReturnsProcessing()
+    {
+        var session = MakeSession("cs_1", "complete", "unpaid");
+        var mock = new Mock<IStripeServiceCaller>();
+        mock.Setup(m => m.GetCheckoutSessionAsync("cs_1")).ReturnsAsync(session);
+
+        var result = await Build(mock.Object).GetStatus("cs_1");
+        Assert.Equal(PaymentStatusEnum.Processing, result.PaymentStatus);
+    }
+
+    [Fact]
+    public async Task GetStatus_Expired_ReturnsRejected()
+    {
+        var session = MakeSession("cs_1", "expired", "unpaid");
+        var mock = new Mock<IStripeServiceCaller>();
+        mock.Setup(m => m.GetCheckoutSessionAsync("cs_1")).ReturnsAsync(session);
+
+        var result = await Build(mock.Object).GetStatus("cs_1");
+        Assert.Equal(PaymentStatusEnum.Rejected, result.PaymentStatus);
+    }
+
+    [Fact]
+    public async Task GetStatus_Open_ReturnsCreated()
+    {
+        var session = MakeSession("cs_1", "open", "unpaid");
+        var mock = new Mock<IStripeServiceCaller>();
+        mock.Setup(m => m.GetCheckoutSessionAsync("cs_1")).ReturnsAsync(session);
+
+        var result = await Build(mock.Object).GetStatus("cs_1");
+        Assert.Equal(PaymentStatusEnum.Created, result.PaymentStatus);
+    }
+
+    // ─── TransactionStatusChange ────────────────────────────────────────────
+
+    [Fact]
+    public async Task TransactionStatusChange_InvalidSignature_ReturnsRejected()
+    {
+        var mock = new Mock<IStripeServiceCaller>();
+        mock.Setup(m => m.ConstructWebhookEvent(It.IsAny<string>(), It.IsAny<string>()))
+            .Throws(new StripeException("No signatures found matching the expected signature for payload"));
+
+        var payload = new TransactionStatusChangePayload
+        {
+            Payload = "{\"type\":\"checkout.session.completed\"}",
+            QueryParameters = new Dictionary<string, StringValues> { { "Stripe-Signature", "t=1,v1=badsig" } },
+        };
+
+        var result = await Build(mock.Object).TransactionStatusChange(payload);
+        Assert.Equal(PaymentStatusEnum.Rejected, result.PaymentStatus);
+        Assert.Contains("signature", result.ResponseObject?.ToString() ?? "", System.StringComparison.OrdinalIgnoreCase);
+    }
+
+    [Fact]
+    public async Task TransactionStatusChange_SessionCompleted_Paid_ReturnsFinished()
+    {
+        var session = MakeSession("cs_1", "complete", "paid");
+        var stripeEvent = MakeEvent("checkout.session.completed", session);
+        var mock = new Mock<IStripeServiceCaller>();
+        mock.Setup(m => m.ConstructWebhookEvent(It.IsAny<string>(), It.IsAny<string>())).Returns(stripeEvent);
+
+        var payload = new TransactionStatusChangePayload
+        {
+            Payload = "{}",
+            QueryParameters = new Dictionary<string, StringValues> { { "Stripe-Signature", "valid" } },
+        };
+
+        var result = await Build(mock.Object).TransactionStatusChange(payload);
+        Assert.Equal(PaymentStatusEnum.Finished, result.PaymentStatus);
+        Assert.Equal("cs_1", result.PaymentUniqueId);
+    }
+
+    [Fact]
+    public async Task TransactionStatusChange_SessionCompleted_Unpaid_ReturnsProcessing()
+    {
+        var session = MakeSession("cs_1", "complete", "no_payment_required");
+        var stripeEvent = MakeEvent("checkout.session.completed", session);
+        var mock = new Mock<IStripeServiceCaller>();
+        mock.Setup(m => m.ConstructWebhookEvent(It.IsAny<string>(), It.IsAny<string>())).Returns(stripeEvent);
+
+        var payload = new TransactionStatusChangePayload
+        {
+            Payload = "{}",
+            QueryParameters = new Dictionary<string, StringValues> { { "Stripe-Signature", "valid" } },
+        };
+
+        var result = await Build(mock.Object).TransactionStatusChange(payload);
+        Assert.Equal(PaymentStatusEnum.Processing, result.PaymentStatus);
+    }
+
+    [Fact]
+    public async Task TransactionStatusChange_SessionExpired_ReturnsRejected()
+    {
+        var stripeEvent = new Event { Type = "checkout.session.expired", Data = new EventData { Object = new Session() } };
+        var mock = new Mock<IStripeServiceCaller>();
+        mock.Setup(m => m.ConstructWebhookEvent(It.IsAny<string>(), It.IsAny<string>())).Returns(stripeEvent);
+
+        var payload = new TransactionStatusChangePayload
+        {
+            Payload = "{}",
+            QueryParameters = new Dictionary<string, StringValues> { { "Stripe-Signature", "valid" } },
+        };
+
+        var result = await Build(mock.Object).TransactionStatusChange(payload);
+        Assert.Equal(PaymentStatusEnum.Rejected, result.PaymentStatus);
+    }
+
+    [Fact]
+    public async Task TransactionStatusChange_PaymentIntentSucceeded_ReturnsFinished()
+    {
+        var stripeEvent = new Event { Type = "payment_intent.succeeded", Data = new EventData { Object = new Session() } };
+        var mock = new Mock<IStripeServiceCaller>();
+        mock.Setup(m => m.ConstructWebhookEvent(It.IsAny<string>(), It.IsAny<string>())).Returns(stripeEvent);
+
+        var payload = new TransactionStatusChangePayload
+        {
+            Payload = "{}",
+            QueryParameters = new Dictionary<string, StringValues> { { "Stripe-Signature", "valid" } },
+        };
+
+        var result = await Build(mock.Object).TransactionStatusChange(payload);
+        Assert.Equal(PaymentStatusEnum.Finished, result.PaymentStatus);
+    }
+
+    [Fact]
+    public async Task TransactionStatusChange_PaymentIntentFailed_ReturnsRejected()
+    {
+        var stripeEvent = new Event { Type = "payment_intent.payment_failed", Data = new EventData { Object = new Session() } };
+        var mock = new Mock<IStripeServiceCaller>();
+        mock.Setup(m => m.ConstructWebhookEvent(It.IsAny<string>(), It.IsAny<string>())).Returns(stripeEvent);
+
+        var payload = new TransactionStatusChangePayload
+        {
+            Payload = "{}",
+            QueryParameters = new Dictionary<string, StringValues> { { "Stripe-Signature", "valid" } },
+        };
+
+        var result = await Build(mock.Object).TransactionStatusChange(payload);
+        Assert.Equal(PaymentStatusEnum.Rejected, result.PaymentStatus);
+    }
+
+    [Fact]
+    public async Task TransactionStatusChange_UnknownEvent_ReturnsProcessing()
+    {
+        var stripeEvent = new Event { Type = "payment_method.attached", Data = new EventData { Object = new Session() } };
+        var mock = new Mock<IStripeServiceCaller>();
+        mock.Setup(m => m.ConstructWebhookEvent(It.IsAny<string>(), It.IsAny<string>())).Returns(stripeEvent);
+
+        var payload = new TransactionStatusChangePayload
+        {
+            Payload = "{}",
+            QueryParameters = new Dictionary<string, StringValues> { { "Stripe-Signature", "valid" } },
+        };
+
+        var result = await Build(mock.Object).TransactionStatusChange(payload);
+        Assert.Equal(PaymentStatusEnum.Processing, result.PaymentStatus);
+    }
+
+    [Fact]
+    public async Task TransactionStatusChange_EmptySignature_FallsToInvalidSig()
+    {
+        var mock = new Mock<IStripeServiceCaller>();
+        mock.Setup(m => m.ConstructWebhookEvent(It.IsAny<string>(), string.Empty))
+            .Throws(new StripeException("No signatures found matching the expected signature for payload"));
+
+        var payload = new TransactionStatusChangePayload
+        {
+            Payload = "{}",
+            QueryParameters = new Dictionary<string, StringValues>(), // No Stripe-Signature key
+        };
+
+        var result = await Build(mock.Object).TransactionStatusChange(payload);
+        Assert.Equal(PaymentStatusEnum.Rejected, result.PaymentStatus);
+    }
+
+    // ─── HandleWebhookAsync ─────────────────────────────────────────────────
+
+    [Fact]
+    public async Task HandleWebhook_InvalidSignature_ReturnsFail()
+    {
+        var mock = new Mock<IStripeServiceCaller>();
+        mock.Setup(m => m.ConstructWebhookEvent(It.IsAny<string>(), It.IsAny<string>()))
+            .Throws(new StripeException("Webhook signature verification failed: No signatures found"));
+
+        var request = new PaymentWebhookRequest
+        {
+            Body = "{}",
+            Headers = new Dictionary<string, StringValues> { { "Stripe-Signature", "t=1,v1=bad" } },
+        };
+
+        var result = await ((IWebhookPaymentProvider)Build(mock.Object)).HandleWebhookAsync(request);
+        Assert.False(result.Success);
+        Assert.NotNull(result.ErrorMessage);
+    }
+
+    [Fact]
+    public async Task HandleWebhook_SessionCompleted_Paid_ReturnsOk_Finished()
+    {
+        var session = MakeSession("cs_1", "complete", "paid", "https://stripe.com/pay");
+        var stripeEvent = MakeEvent("checkout.session.completed", session);
+
+        var mock = new Mock<IStripeServiceCaller>();
+        mock.Setup(m => m.ConstructWebhookEvent(It.IsAny<string>(), It.IsAny<string>())).Returns(stripeEvent);
+
+        var request = new PaymentWebhookRequest
+        {
+            Body = "{}",
+            Headers = new Dictionary<string, StringValues> { { "Stripe-Signature", "valid_sig" } },
+        };
+
+        var result = await ((IWebhookPaymentProvider)Build(mock.Object)).HandleWebhookAsync(request);
+        Assert.True(result.Success);
+        Assert.False(result.Ignored);
+        Assert.Equal(PaymentStatusEnum.Finished, result.PaymentResponse!.PaymentStatus);
+    }
+
+    [Fact]
+    public async Task HandleWebhook_UnknownEvent_ReturnsIgnore()
+    {
+        var stripeEvent = new Event { Type = "customer.created", Data = new EventData { Object = new Session() } };
+        var mock = new Mock<IStripeServiceCaller>();
+        mock.Setup(m => m.ConstructWebhookEvent(It.IsAny<string>(), It.IsAny<string>())).Returns(stripeEvent);
+
+        var request = new PaymentWebhookRequest
+        {
+            Body = "{}",
+            Headers = new Dictionary<string, StringValues> { { "Stripe-Signature", "valid_sig" } },
+        };
+
+        var result = await ((IWebhookPaymentProvider)Build(mock.Object)).HandleWebhookAsync(request);
+        Assert.True(result.Ignored);
+    }
+
+    [Fact]
+    public async Task HandleWebhook_SessionExpired_ReturnsIgnore()
+    {
+        var stripeEvent = new Event { Type = "checkout.session.expired", Data = new EventData { Object = new Session() } };
+        var mock = new Mock<IStripeServiceCaller>();
+        mock.Setup(m => m.ConstructWebhookEvent(It.IsAny<string>(), It.IsAny<string>())).Returns(stripeEvent);
+
+        var request = new PaymentWebhookRequest
+        {
+            Body = "{}",
+            Headers = new Dictionary<string, StringValues> { { "Stripe-Signature", "valid" } },
+        };
+
+        // expired → Rejected + "OK" (no "signature") → then check IsNullOrEmpty(paymentUniqueId) → Ignore
+        var result = await ((IWebhookPaymentProvider)Build(mock.Object)).HandleWebhookAsync(request);
+        Assert.True(result.Success || result.Ignored); // either Ignore or Ok, not Fail
+    }
+
+    [Fact]
+    public async Task HandleWebhook_SessionCompleted_Unpaid_ReturnsIgnore()
+    {
+        var session = MakeSession("cs_1", "complete", "unpaid");
+        var stripeEvent = MakeEvent("checkout.session.completed", session);
+        var mock = new Mock<IStripeServiceCaller>();
+        mock.Setup(m => m.ConstructWebhookEvent(It.IsAny<string>(), It.IsAny<string>())).Returns(stripeEvent);
+
+        var request = new PaymentWebhookRequest
+        {
+            Body = "{}",
+            Headers = new Dictionary<string, StringValues> { { "Stripe-Signature", "valid" } },
+        };
+
+        var result = await ((IWebhookPaymentProvider)Build(mock.Object)).HandleWebhookAsync(request);
+        // Processing → Ignore
+        Assert.True(result.Ignored);
+    }
+}
+
+// ────────────────────────────────────────────────────────────────────────────
+// Tpay — dodatkowe testy pokrycia
+// ────────────────────────────────────────────────────────────────────────────
+
+public class TpayProviderAdditionalTests
+{
+    private static TpayProvider Build(ITpayServiceCaller caller) => new(caller);
+
+    [Fact]
+    public void Description_NotEmpty() => Assert.NotEmpty(Build(Mock.Of<ITpayServiceCaller>()).Description);
+
+    [Fact]
+    public void Url_ContainsTpay() => Assert.Contains("tpay", Build(Mock.Of<ITpayServiceCaller>()).Url);
+
+    [Fact]
+    public async Task GetChannels_USD_ContainsBlik()
+    {
+        var channels = await Build(Mock.Of<ITpayServiceCaller>()).GetPaymentChannels("USD");
+        Assert.Contains(channels, c => c.Id == "blik");
+    }
+
+    [Fact]
+    public async Task GetStatus_Processing()
+    {
+        var mock = new Mock<ITpayServiceCaller>();
+        mock.Setup(m => m.GetAccessTokenAsync()).ReturnsAsync("tok");
+        mock.Setup(m => m.GetTransactionStatusAsync("tok", "txn_1")).ReturnsAsync(PaymentStatusEnum.Processing);
+        var result = await Build(mock.Object).GetStatus("txn_1");
+        Assert.Equal(PaymentStatusEnum.Processing, result.PaymentStatus);
+    }
+
+    [Fact]
+    public async Task GetStatus_Rejected()
+    {
+        var mock = new Mock<ITpayServiceCaller>();
+        mock.Setup(m => m.GetAccessTokenAsync()).ReturnsAsync("tok");
+        mock.Setup(m => m.GetTransactionStatusAsync("tok", "txn_1")).ReturnsAsync(PaymentStatusEnum.Rejected);
+        var result = await Build(mock.Object).GetStatus("txn_1");
+        Assert.Equal(PaymentStatusEnum.Rejected, result.PaymentStatus);
+    }
+
+    [Fact]
+    public async Task TransactionStatusChange_correct_Status_ReturnsFinished()
+    {
+        var body = """{"id":"txn_1","status":"correct"}""";
+        var mock = new Mock<ITpayServiceCaller>();
+        mock.Setup(m => m.VerifyNotification(body, "sig")).Returns(true);
+        var qs = new Dictionary<string, StringValues> { { "X-Signature", "sig" } };
+        var result = await Build(mock.Object).TransactionStatusChange(new TransactionStatusChangePayload
+        {
+            Payload = body,
+            QueryParameters = qs,
+        });
+        Assert.Equal(PaymentStatusEnum.Finished, result.PaymentStatus);
+    }
+
+    [Fact]
+    public async Task TransactionStatusChange_chargeback_Status_ReturnsRejected()
+    {
+        var body = """{"id":"txn_1","status":"chargeback"}""";
+        var mock = new Mock<ITpayServiceCaller>();
+        mock.Setup(m => m.VerifyNotification(body, "sig")).Returns(true);
+        var qs = new Dictionary<string, StringValues> { { "X-Signature", "sig" } };
+        var result = await Build(mock.Object).TransactionStatusChange(new TransactionStatusChangePayload
+        {
+            Payload = body,
+            QueryParameters = qs,
+        });
+        Assert.Equal(PaymentStatusEnum.Rejected, result.PaymentStatus);
+    }
+
+    [Fact]
+    public async Task TransactionStatusChange_TRUE_LegacyStatus_ReturnsFinished()
+    {
+        var body = """{"id":"txn_1","status":"TRUE"}""";
+        var mock = new Mock<ITpayServiceCaller>();
+        mock.Setup(m => m.VerifyNotification(body, "sig")).Returns(true);
+        var qs = new Dictionary<string, StringValues> { { "X-Signature", "sig" } };
+        var result = await Build(mock.Object).TransactionStatusChange(new TransactionStatusChangePayload
+        {
+            Payload = body,
+            QueryParameters = qs,
+        });
+        Assert.Equal(PaymentStatusEnum.Finished, result.PaymentStatus);
+    }
+
+    [Fact]
+    public async Task TransactionStatusChange_FALSE_LegacyStatus_ReturnsRejected()
+    {
+        var body = """{"id":"txn_1","status":"FALSE"}""";
+        var mock = new Mock<ITpayServiceCaller>();
+        mock.Setup(m => m.VerifyNotification(body, "sig")).Returns(true);
+        var qs = new Dictionary<string, StringValues> { { "X-Signature", "sig" } };
+        var result = await Build(mock.Object).TransactionStatusChange(new TransactionStatusChangePayload
+        {
+            Payload = body,
+            QueryParameters = qs,
+        });
+        Assert.Equal(PaymentStatusEnum.Rejected, result.PaymentStatus);
+    }
+
+    [Fact]
+    public async Task TransactionStatusChange_TrStatus_Paid_ReturnsFinished()
+    {
+        var body = """{"id":"txn_1","tr_status":"paid"}""";
+        var mock = new Mock<ITpayServiceCaller>();
+        mock.Setup(m => m.VerifyNotification(body, "sig")).Returns(true);
+        var qs = new Dictionary<string, StringValues> { { "X-Signature", "sig" } };
+        var result = await Build(mock.Object).TransactionStatusChange(new TransactionStatusChangePayload
+        {
+            Payload = body,
+            QueryParameters = qs,
+        });
+        Assert.Equal(PaymentStatusEnum.Finished, result.PaymentStatus);
+    }
+
+    [Fact]
+    public async Task TransactionStatusChange_UnknownStatus_ReturnsProcessing()
+    {
+        var body = """{"id":"txn_1","status":"unknown_state"}""";
+        var mock = new Mock<ITpayServiceCaller>();
+        mock.Setup(m => m.VerifyNotification(body, "sig")).Returns(true);
+        var qs = new Dictionary<string, StringValues> { { "X-Signature", "sig" } };
+        var result = await Build(mock.Object).TransactionStatusChange(new TransactionStatusChangePayload
+        {
+            Payload = body,
+            QueryParameters = qs,
+        });
+        Assert.Equal(PaymentStatusEnum.Processing, result.PaymentStatus);
+    }
+
+    [Fact]
+    public async Task TransactionStatusChange_MalformedJson_StillReturns()
+    {
+        var body = "NOT_JSON";
+        var mock = new Mock<ITpayServiceCaller>();
+        mock.Setup(m => m.VerifyNotification(body, "sig")).Returns(true);
+        var qs = new Dictionary<string, StringValues> { { "X-Signature", "sig" } };
+        var result = await Build(mock.Object).TransactionStatusChange(new TransactionStatusChangePayload
+        {
+            Payload = body,
+            QueryParameters = qs,
+        });
+        // JSON parse fails → catch → status = Processing
+        Assert.Equal(PaymentStatusEnum.Processing, result.PaymentStatus);
+    }
+}
+
+// ────────────────────────────────────────────────────────────────────────────
+// PayU — dodatkowe testy pokrycia
+// ────────────────────────────────────────────────────────────────────────────
+
+public class PayUProviderAdditionalTests
+{
+    private static PayUProvider Build(IPayUServiceCaller caller) => new(caller);
+
+    [Fact]
+    public void Name_IsPayU() => Assert.Equal("PayU", Build(Mock.Of<IPayUServiceCaller>()).Name);
+
+    [Fact]
+    public void Description_NotEmpty() => Assert.NotEmpty(Build(Mock.Of<IPayUServiceCaller>()).Description);
+
+    [Fact]
+    public void Url_ContainsPayu() => Assert.Contains("payu", Build(Mock.Of<IPayUServiceCaller>()).Url);
+
+    [Fact]
+    public async Task GetChannels_USD_ContainsCard()
+    {
+        var channels = await Build(Mock.Of<IPayUServiceCaller>()).GetPaymentChannels("USD");
+        Assert.Contains(channels, c => c.Id == "c");
+    }
+
+    [Fact]
+    public async Task TransactionStatusChange_REJECTED_Status_ReturnsRejected()
+    {
+        var body = """{"order":{"status":"REJECTED","orderId":"order_1"}}""";
+        var mock = new Mock<IPayUServiceCaller>();
+        mock.Setup(m => m.VerifySignature(body, It.IsAny<string>())).Returns(true);
+        var qs = new Dictionary<string, StringValues> { { "OpenPayU-Signature", "sender=x;signature=valid;algorithm=MD5" } };
+        var result = await Build(mock.Object).TransactionStatusChange(new TransactionStatusChangePayload
+        {
+            Payload = body,
+            QueryParameters = qs,
+        });
+        Assert.Equal(PaymentStatusEnum.Rejected, result.PaymentStatus);
+    }
+
+    [Fact]
+    public async Task TransactionStatusChange_MalformedJson_ReturnsProcessing()
+    {
+        var body = "NOT_JSON";
+        var mock = new Mock<IPayUServiceCaller>();
+        mock.Setup(m => m.VerifySignature(body, It.IsAny<string>())).Returns(true);
+        var qs = new Dictionary<string, StringValues> { { "OpenPayU-Signature", "sender=x;signature=valid;algorithm=MD5" } };
+        var result = await Build(mock.Object).TransactionStatusChange(new TransactionStatusChangePayload
+        {
+            Payload = body,
+            QueryParameters = qs,
+        });
+        Assert.Equal(PaymentStatusEnum.Processing, result.PaymentStatus);
+    }
+
+    [Fact]
+    public async Task TransactionStatusChange_NoOrderProperty_ReturnsProcessing()
+    {
+        var body = """{"status":"COMPLETED"}""";
+        var mock = new Mock<IPayUServiceCaller>();
+        mock.Setup(m => m.VerifySignature(body, It.IsAny<string>())).Returns(true);
+        var qs = new Dictionary<string, StringValues> { { "OpenPayU-Signature", "sender=x;signature=valid;algorithm=MD5" } };
+        var result = await Build(mock.Object).TransactionStatusChange(new TransactionStatusChangePayload
+        {
+            Payload = body,
+            QueryParameters = qs,
+        });
+        Assert.Equal(PaymentStatusEnum.Processing, result.PaymentStatus);
+    }
+
+    [Fact]
+    public async Task RequestPayment_TokenFetchFails_ThrowsOrRejected()
+    {
+        var mock = new Mock<IPayUServiceCaller>();
+        mock.Setup(m => m.GetAccessTokenAsync()).ReturnsAsync(string.Empty);
+        mock.Setup(m => m.CreateOrderAsync(string.Empty, It.IsAny<PaymentRequest>()))
+            .ReturnsAsync((null, null, "Error"));
+        var result = await Build(mock.Object).RequestPayment(new PaymentRequest
+        {
+            PaymentProvider = "PayU",
+            Currency = "PLN",
+            Amount = 1m,
+        });
+        Assert.Equal(PaymentStatusEnum.Rejected, result.PaymentStatus);
+    }
+}
+
+// ────────────────────────────────────────────────────────────────────────────
+// Przelewy24 — dodatkowe testy pokrycia
+// ────────────────────────────────────────────────────────────────────────────
+
+public class Przelewy24ProviderAdditionalTests
+{
+    private static Przelewy24Provider Build(IPrzelewy24ServiceCaller caller, string serviceUrl = "https://secure.przelewy24.pl")
+        => new(caller, Options.Create(new Przelewy24ServiceOptions
+        {
+            MerchantId = 12345,
+            PosId = 12345,
+            ServiceUrl = serviceUrl,
+            NotifyUrl = "https://example.com/notify",
+            ReturnUrl = "https://example.com/return",
+        }));
+
+    [Fact]
+    public void Name_IsPrzelewy24() => Assert.Equal("Przelewy24", Build(Mock.Of<IPrzelewy24ServiceCaller>()).Name);
+
+    [Fact]
+    public void Description_NotEmpty() => Assert.NotEmpty(Build(Mock.Of<IPrzelewy24ServiceCaller>()).Description);
+
+    [Fact]
+    public void Url_ContainsPrzelewy24() => Assert.Contains("przelewy24", Build(Mock.Of<IPrzelewy24ServiceCaller>()).Url);
+
+    [Fact]
+    public async Task GetChannels_USD_ContainsCard()
+    {
+        var channels = await Build(Mock.Of<IPrzelewy24ServiceCaller>()).GetPaymentChannels("USD");
+        Assert.Contains(channels, c => c.Id == "card");
+    }
+
+    [Fact]
+    public async Task RequestPayment_RedirectUrl_ContainsServiceUrl()
+    {
+        var mock = new Mock<IPrzelewy24ServiceCaller>();
+        mock.Setup(m => m.RegisterTransactionAsync(It.IsAny<PaymentRequest>(), It.IsAny<string>()))
+            .ReturnsAsync(("token_abc", null));
+        var result = await Build(mock.Object, "https://sandbox.przelewy24.pl").RequestPayment(new PaymentRequest
+        {
+            Currency = "PLN",
+            Amount = 10m,
+            Email = "x@example.com",
+        });
+        Assert.Equal(PaymentStatusEnum.Created, result.PaymentStatus);
+        Assert.Contains("sandbox.przelewy24.pl", result.RedirectUrl);
+        Assert.Contains("token_abc", result.RedirectUrl);
+    }
+
+    [Fact]
+    public async Task TransactionStatusChange_MissingFields_ReturnsRejected()
+    {
+        var body = """{"sessionId":"s1","currency":"PLN"}"""; // missing amount and orderId
+        var mock = new Mock<IPrzelewy24ServiceCaller>();
+        mock.Setup(m => m.VerifyNotification(body)).Returns(true);
+        var result = await Build(mock.Object).TransactionStatusChange(new TransactionStatusChangePayload
+        {
+            Payload = body,
+            QueryParameters = new Dictionary<string, StringValues>(),
+        });
+        Assert.Equal(PaymentStatusEnum.Rejected, result.PaymentStatus);
+    }
+
+    [Fact]
+    public async Task TransactionStatusChange_Processing_VerifyReturnsProcessing()
+    {
+        var body = """{"sessionId":"sess_1","amount":999,"currency":"PLN","orderId":12345}""";
+        var mock = new Mock<IPrzelewy24ServiceCaller>();
+        mock.Setup(m => m.VerifyNotification(body)).Returns(true);
+        mock.Setup(m => m.VerifyTransactionAsync("sess_1", 999, "PLN", 12345)).ReturnsAsync(PaymentStatusEnum.Processing);
+        var result = await Build(mock.Object).TransactionStatusChange(new TransactionStatusChangePayload
+        {
+            Payload = body,
+            QueryParameters = new Dictionary<string, StringValues>(),
+        });
+        Assert.Equal(PaymentStatusEnum.Processing, result.PaymentStatus);
+    }
+}
+
+// ────────────────────────────────────────────────────────────────────────────
+// PayNow — dodatkowe testy pokrycia
+// ────────────────────────────────────────────────────────────────────────────
+
+public class PayNowProviderAdditionalTests
+{
+    private static PayNowProvider Build(IPayNowServiceCaller caller) => new(caller);
+
+    [Fact]
+    public void Name_IsPayNow() => Assert.Equal("PayNow", Build(Mock.Of<IPayNowServiceCaller>()).Name);
+
+    [Fact]
+    public void Description_NotEmpty() => Assert.NotEmpty(Build(Mock.Of<IPayNowServiceCaller>()).Description);
+
+    [Fact]
+    public void Url_ContainsPaynow() => Assert.Contains("paynow", Build(Mock.Of<IPayNowServiceCaller>()).Url);
+
+    [Fact]
+    public async Task GetChannels_EUR_ContainsBlik()
+    {
+        var channels = await Build(Mock.Of<IPayNowServiceCaller>()).GetPaymentChannels("EUR");
+        Assert.Contains(channels, c => c.Id == "BLIK");
+    }
+
+    [Fact]
+    public async Task GetStatus_Rejected()
+    {
+        var mock = new Mock<IPayNowServiceCaller>();
+        mock.Setup(m => m.GetPaymentStatusAsync("pn_1")).ReturnsAsync(PaymentStatusEnum.Rejected);
+        var result = await Build(mock.Object).GetStatus("pn_1");
+        Assert.Equal(PaymentStatusEnum.Rejected, result.PaymentStatus);
+    }
+
+    [Fact]
+    public async Task GetStatus_Created()
+    {
+        var mock = new Mock<IPayNowServiceCaller>();
+        mock.Setup(m => m.GetPaymentStatusAsync("pn_1")).ReturnsAsync(PaymentStatusEnum.Created);
+        var result = await Build(mock.Object).GetStatus("pn_1");
+        Assert.Equal(PaymentStatusEnum.Created, result.PaymentStatus);
+    }
+
+    [Fact]
+    public async Task TransactionStatusChange_REJECTED_Status_ReturnsRejected()
+    {
+        var body = """{"paymentId":"pn_1","status":"REJECTED"}""";
+        var mock = new Mock<IPayNowServiceCaller>();
+        mock.Setup(m => m.VerifySignature(body, "sig")).Returns(true);
+        var qs = new Dictionary<string, StringValues> { { "Signature", "sig" } };
+        var result = await Build(mock.Object).TransactionStatusChange(new TransactionStatusChangePayload
+        {
+            Payload = body,
+            QueryParameters = qs,
+        });
+        Assert.Equal(PaymentStatusEnum.Rejected, result.PaymentStatus);
+    }
+
+    [Fact]
+    public async Task TransactionStatusChange_ABANDONED_Status_ReturnsRejected()
+    {
+        var body = """{"paymentId":"pn_1","status":"ABANDONED"}""";
+        var mock = new Mock<IPayNowServiceCaller>();
+        mock.Setup(m => m.VerifySignature(body, "sig")).Returns(true);
+        var qs = new Dictionary<string, StringValues> { { "Signature", "sig" } };
+        var result = await Build(mock.Object).TransactionStatusChange(new TransactionStatusChangePayload
+        {
+            Payload = body,
+            QueryParameters = qs,
+        });
+        Assert.Equal(PaymentStatusEnum.Rejected, result.PaymentStatus);
+    }
+
+    [Fact]
+    public async Task TransactionStatusChange_MalformedJson_ReturnsProcessing()
+    {
+        var body = "NOT_JSON";
+        var mock = new Mock<IPayNowServiceCaller>();
+        mock.Setup(m => m.VerifySignature(body, "sig")).Returns(true);
+        var qs = new Dictionary<string, StringValues> { { "Signature", "sig" } };
+        var result = await Build(mock.Object).TransactionStatusChange(new TransactionStatusChangePayload
+        {
+            Payload = body,
+            QueryParameters = qs,
+        });
+        Assert.Equal(PaymentStatusEnum.Processing, result.PaymentStatus);
+    }
+
+    [Fact]
+    public async Task TransactionStatusChange_UnknownStatus_ReturnsProcessing()
+    {
+        var body = """{"paymentId":"pn_1","status":"UNKNOWN"}""";
+        var mock = new Mock<IPayNowServiceCaller>();
+        mock.Setup(m => m.VerifySignature(body, "sig")).Returns(true);
+        var qs = new Dictionary<string, StringValues> { { "Signature", "sig" } };
+        var result = await Build(mock.Object).TransactionStatusChange(new TransactionStatusChangePayload
+        {
+            Payload = body,
+            QueryParameters = qs,
+        });
+        Assert.Equal(PaymentStatusEnum.Processing, result.PaymentStatus);
+    }
+}
+
+// ────────────────────────────────────────────────────────────────────────────
+// Adyen — dodatkowe testy pokrycia
+// ────────────────────────────────────────────────────────────────────────────
+
+public class AdyenProviderAdditionalTests
+{
+    private static AdyenProvider Build(IAdyenServiceCaller caller) => new(caller);
+
+    [Fact]
+    public void Description_NotEmpty() => Assert.NotEmpty(Build(Mock.Of<IAdyenServiceCaller>()).Description);
+
+    [Fact]
+    public void Url_ContainsAdyen() => Assert.Contains("adyen", Build(Mock.Of<IAdyenServiceCaller>()).Url);
+
+    [Fact]
+    public async Task GetChannels_PLN_ContainsOnlineBanking()
+    {
+        var channels = await Build(Mock.Of<IAdyenServiceCaller>()).GetPaymentChannels("PLN");
+        Assert.Contains(channels, c => c.Id == "onlineBanking_PL");
+    }
+
+    [Fact]
+    public async Task GetChannels_EUR_ContainsSepa()
+    {
+        var channels = await Build(Mock.Of<IAdyenServiceCaller>()).GetPaymentChannels("EUR");
+        Assert.Contains(channels, c => c.Id == "sepadirectdebit");
+    }
+
+    [Fact]
+    public async Task GetStatus_Rejected()
+    {
+        var mock = new Mock<IAdyenServiceCaller>();
+        mock.Setup(m => m.GetPaymentStatusAsync("psp_1")).ReturnsAsync(PaymentStatusEnum.Rejected);
+        var result = await Build(mock.Object).GetStatus("psp_1");
+        Assert.Equal(PaymentStatusEnum.Rejected, result.PaymentStatus);
+    }
+
+    [Fact]
+    public async Task GetStatus_Created()
+    {
+        var mock = new Mock<IAdyenServiceCaller>();
+        mock.Setup(m => m.GetPaymentStatusAsync("psp_1")).ReturnsAsync(PaymentStatusEnum.Created);
+        var result = await Build(mock.Object).GetStatus("psp_1");
+        Assert.Equal(PaymentStatusEnum.Created, result.PaymentStatus);
+    }
+
+    [Fact]
+    public async Task TransactionStatusChange_CANCELLATION_ReturnsRejected()
+    {
+        var body = """{"notificationItems":[{"NotificationRequestItem":{"eventCode":"CANCELLATION","success":"true","pspReference":"psp_1"}}]}""";
+        var mock = new Mock<IAdyenServiceCaller>();
+        mock.Setup(m => m.VerifyNotificationHmac(body, "hmac")).Returns(true);
+        var qs = new Dictionary<string, StringValues> { { "HmacSignature", "hmac" } };
+        var result = await Build(mock.Object).TransactionStatusChange(new TransactionStatusChangePayload
+        {
+            Payload = body,
+            QueryParameters = qs,
+        });
+        Assert.Equal(PaymentStatusEnum.Rejected, result.PaymentStatus);
+    }
+
+    [Fact]
+    public async Task TransactionStatusChange_AUTHORISATION_FAILED_ReturnsRejected()
+    {
+        var body = """{"notificationItems":[{"NotificationRequestItem":{"eventCode":"AUTHORISATION_FAILED","success":"true","pspReference":"psp_1"}}]}""";
+        var mock = new Mock<IAdyenServiceCaller>();
+        mock.Setup(m => m.VerifyNotificationHmac(body, "hmac")).Returns(true);
+        var qs = new Dictionary<string, StringValues> { { "HmacSignature", "hmac" } };
+        var result = await Build(mock.Object).TransactionStatusChange(new TransactionStatusChangePayload
+        {
+            Payload = body,
+            QueryParameters = qs,
+        });
+        Assert.Equal(PaymentStatusEnum.Rejected, result.PaymentStatus);
+    }
+
+    [Fact]
+    public async Task TransactionStatusChange_UnknownEvent_ReturnsProcessing()
+    {
+        var body = """{"notificationItems":[{"NotificationRequestItem":{"eventCode":"UNKNOWN_EVT","success":"true","pspReference":"psp_1"}}]}""";
+        var mock = new Mock<IAdyenServiceCaller>();
+        mock.Setup(m => m.VerifyNotificationHmac(body, "hmac")).Returns(true);
+        var qs = new Dictionary<string, StringValues> { { "HmacSignature", "hmac" } };
+        var result = await Build(mock.Object).TransactionStatusChange(new TransactionStatusChangePayload
+        {
+            Payload = body,
+            QueryParameters = qs,
+        });
+        Assert.Equal(PaymentStatusEnum.Processing, result.PaymentStatus);
+    }
+
+    [Fact]
+    public async Task TransactionStatusChange_MalformedJson_ReturnsProcessing()
+    {
+        var body = "NOT_JSON";
+        var mock = new Mock<IAdyenServiceCaller>();
+        mock.Setup(m => m.VerifyNotificationHmac(body, "hmac")).Returns(true);
+        var qs = new Dictionary<string, StringValues> { { "HmacSignature", "hmac" } };
+        var result = await Build(mock.Object).TransactionStatusChange(new TransactionStatusChangePayload
+        {
+            Payload = body,
+            QueryParameters = qs,
+        });
+        Assert.Equal(PaymentStatusEnum.Processing, result.PaymentStatus);
+    }
+
+    [Fact]
+    public async Task TransactionStatusChange_DirectObject_NotWrapped_ReturnsFinished()
+    {
+        // Body without notificationItems wrapper — eventCode directly at root
+        var body = """{"eventCode":"AUTHORISATION","success":"true","pspReference":"psp_1"}""";
+        var mock = new Mock<IAdyenServiceCaller>();
+        mock.Setup(m => m.VerifyNotificationHmac(body, "hmac")).Returns(true);
+        var qs = new Dictionary<string, StringValues> { { "HmacSignature", "hmac" } };
+        var result = await Build(mock.Object).TransactionStatusChange(new TransactionStatusChangePayload
+        {
+            Payload = body,
+            QueryParameters = qs,
+        });
+        Assert.Equal(PaymentStatusEnum.Finished, result.PaymentStatus);
+    }
+
+    [Fact]
+    public async Task TransactionStatusChange_REFUND_SuccessFalse_ReturnsRejected()
+    {
+        var body = """{"notificationItems":[{"NotificationRequestItem":{"eventCode":"REFUND","success":"false","pspReference":"psp_1"}}]}""";
+        var mock = new Mock<IAdyenServiceCaller>();
+        mock.Setup(m => m.VerifyNotificationHmac(body, "hmac")).Returns(true);
+        var qs = new Dictionary<string, StringValues> { { "HmacSignature", "hmac" } };
+        var result = await Build(mock.Object).TransactionStatusChange(new TransactionStatusChangePayload
+        {
+            Payload = body,
+            QueryParameters = qs,
+        });
+        Assert.Equal(PaymentStatusEnum.Rejected, result.PaymentStatus);
+    }
+}
+
+// ────────────────────────────────────────────────────────────────────────────
+// Revolut — dodatkowe testy pokrycia
+// ────────────────────────────────────────────────────────────────────────────
+
+public class RevolutProviderAdditionalTests
+{
+    private static RevolutProvider Build(IRevolutServiceCaller caller) => new(caller);
+
+    [Fact]
+    public void Name_IsRevolut() => Assert.Equal("Revolut", Build(Mock.Of<IRevolutServiceCaller>()).Name);
+
+    [Fact]
+    public void Description_NotEmpty() => Assert.NotEmpty(Build(Mock.Of<IRevolutServiceCaller>()).Description);
+
+    [Fact]
+    public void Url_ContainsRevolut() => Assert.Contains("revolut", Build(Mock.Of<IRevolutServiceCaller>()).Url);
+
+    [Fact]
+    public async Task GetChannels_USD_ContainsCard()
+    {
+        var channels = await Build(Mock.Of<IRevolutServiceCaller>()).GetPaymentChannels("USD");
+        Assert.Contains(channels, c => c.Id == "card");
+    }
+
+    [Fact]
+    public async Task GetStatus_Failed_ReturnsRejected()
+    {
+        var mock = new Mock<IRevolutServiceCaller>();
+        mock.Setup(m => m.GetOrderAsync("rev_1")).ReturnsAsync(("failed", "rev_1"));
+        var result = await Build(mock.Object).GetStatus("rev_1");
+        Assert.Equal(PaymentStatusEnum.Rejected, result.PaymentStatus);
+    }
+
+    [Fact]
+    public async Task GetStatus_Processing_State_ReturnsProcessing()
+    {
+        var mock = new Mock<IRevolutServiceCaller>();
+        mock.Setup(m => m.GetOrderAsync("rev_1")).ReturnsAsync(("processing", "rev_1"));
+        var result = await Build(mock.Object).GetStatus("rev_1");
+        Assert.Equal(PaymentStatusEnum.Processing, result.PaymentStatus);
+    }
+
+    [Fact]
+    public async Task GetStatus_Unknown_ReturnsCreated()
+    {
+        var mock = new Mock<IRevolutServiceCaller>();
+        mock.Setup(m => m.GetOrderAsync("rev_1")).ReturnsAsync(("initiated", "rev_1"));
+        var result = await Build(mock.Object).GetStatus("rev_1");
+        Assert.Equal(PaymentStatusEnum.Created, result.PaymentStatus);
+    }
+
+    [Fact]
+    public async Task TransactionStatusChange_ORDER_CANCELLED_ReturnsRejected()
+    {
+        var body = """{"event":"ORDER_CANCELLED","order_id":"rev_1"}""";
+        var mock = new Mock<IRevolutServiceCaller>();
+        mock.Setup(m => m.VerifyWebhookSignature(body, "123", "v1=sig")).Returns(true);
+        var qs = new Dictionary<string, StringValues>
+        {
+            { "Revolut-Signature", "v1=sig" },
+            { "Revolut-Request-Timestamp", "123" },
+        };
+        var result = await Build(mock.Object).TransactionStatusChange(new TransactionStatusChangePayload
+        {
+            Payload = body,
+            QueryParameters = qs,
+        });
+        Assert.Equal(PaymentStatusEnum.Rejected, result.PaymentStatus);
+    }
+
+    [Fact]
+    public async Task TransactionStatusChange_PAYMENT_DECLINED_ReturnsRejected()
+    {
+        var body = """{"event":"PAYMENT_DECLINED","order_id":"rev_1"}""";
+        var mock = new Mock<IRevolutServiceCaller>();
+        mock.Setup(m => m.VerifyWebhookSignature(body, "123", "v1=sig")).Returns(true);
+        var qs = new Dictionary<string, StringValues>
+        {
+            { "Revolut-Signature", "v1=sig" },
+            { "Revolut-Request-Timestamp", "123" },
+        };
+        var result = await Build(mock.Object).TransactionStatusChange(new TransactionStatusChangePayload
+        {
+            Payload = body,
+            QueryParameters = qs,
+        });
+        Assert.Equal(PaymentStatusEnum.Rejected, result.PaymentStatus);
+    }
+
+    [Fact]
+    public async Task TransactionStatusChange_UnknownEvent_ReturnsProcessing()
+    {
+        var body = """{"event":"ORDER_PROCESSING","order_id":"rev_1"}""";
+        var mock = new Mock<IRevolutServiceCaller>();
+        mock.Setup(m => m.VerifyWebhookSignature(body, "123", "v1=sig")).Returns(true);
+        var qs = new Dictionary<string, StringValues>
+        {
+            { "Revolut-Signature", "v1=sig" },
+            { "Revolut-Request-Timestamp", "123" },
+        };
+        var result = await Build(mock.Object).TransactionStatusChange(new TransactionStatusChangePayload
+        {
+            Payload = body,
+            QueryParameters = qs,
+        });
+        Assert.Equal(PaymentStatusEnum.Processing, result.PaymentStatus);
+    }
+
+    [Fact]
+    public async Task TransactionStatusChange_MalformedJson_ReturnsProcessing()
+    {
+        var body = "NOT_JSON";
+        var mock = new Mock<IRevolutServiceCaller>();
+        mock.Setup(m => m.VerifyWebhookSignature(body, "123", "v1=sig")).Returns(true);
+        var qs = new Dictionary<string, StringValues>
+        {
+            { "Revolut-Signature", "v1=sig" },
+            { "Revolut-Request-Timestamp", "123" },
+        };
+        var result = await Build(mock.Object).TransactionStatusChange(new TransactionStatusChangePayload
+        {
+            Payload = body,
+            QueryParameters = qs,
+        });
+        Assert.Equal(PaymentStatusEnum.Processing, result.PaymentStatus);
+    }
+}
+
+// ────────────────────────────────────────────────────────────────────────────
+// HotPay — dodatkowe testy pokrycia
+// ────────────────────────────────────────────────────────────────────────────
+
+public class HotPayProviderAdditionalTests
+{
+    private static HotPayProvider Build(IHotPayServiceCaller caller) => new(caller);
+
+    [Fact]
+    public void Name_IsHotPay() => Assert.Equal("HotPay", Build(Mock.Of<IHotPayServiceCaller>()).Name);
+
+    [Fact]
+    public void Description_NotEmpty() => Assert.NotEmpty(Build(Mock.Of<IHotPayServiceCaller>()).Description);
+
+    [Fact]
+    public void Url_ContainsHotpay() => Assert.Contains("hotpay", Build(Mock.Of<IHotPayServiceCaller>()).Url);
+
+    [Fact]
+    public async Task GetChannels_EUR_ContainsCard()
+    {
+        var channels = await Build(Mock.Of<IHotPayServiceCaller>()).GetPaymentChannels("EUR");
+        Assert.Contains(channels, c => c.Id == "card");
+    }
+
+    [Fact]
+    public async Task RequestPayment_OnlyIdReturned_StillCreated()
+    {
+        // resultId non-null, redirectUrl null → status Created
+        var mock = new Mock<IHotPayServiceCaller>();
+        mock.Setup(m => m.InitPaymentAsync(It.IsAny<PaymentRequest>(), It.IsAny<string>()))
+            .ReturnsAsync(("pay_abc", null));
+        var result = await Build(mock.Object).RequestPayment(new PaymentRequest
+        {
+            PaymentProvider = "HotPay",
+            Currency = "PLN",
+            Amount = 9.99m,
+        });
+        Assert.Equal(PaymentStatusEnum.Created, result.PaymentStatus);
+    }
+
+    [Fact]
+    public async Task GetStatus_HasPaymentId()
+    {
+        var result = await Build(Mock.Of<IHotPayServiceCaller>()).GetStatus("pay_xyz");
+        Assert.Equal("pay_xyz", result.PaymentUniqueId);
+    }
+
+    [Fact]
+    public async Task TransactionStatusChange_UnknownStatus_ReturnsRejected()
+    {
+        // Any status other than SUCCESS is mapped as Rejected
+        var mock = new Mock<IHotPayServiceCaller>();
+        mock.Setup(m => m.VerifyNotification("h", "9.99", "pay_1", "PENDING")).Returns(true);
+        var qs = new Dictionary<string, StringValues>
+        {
+            { "HASH", "h" }, { "KWOTA", "9.99" }, { "ID_PLATNOSCI", "pay_1" }, { "STATUS", "PENDING" },
+        };
+        var result = await Build(mock.Object).TransactionStatusChange(new TransactionStatusChangePayload
+        {
+            QueryParameters = qs,
+        });
+        Assert.Equal(PaymentStatusEnum.Rejected, result.PaymentStatus);
+    }
+}
diff --git a/tests/TailoredApps.Shared.Payments.Tests/MockedIntegrationTests.cs b/tests/TailoredApps.Shared.Payments.Tests/MockedIntegrationTests.cs
new file mode 100644
index 0000000..fb17a63
--- /dev/null
+++ b/tests/TailoredApps.Shared.Payments.Tests/MockedIntegrationTests.cs
@@ -0,0 +1,919 @@
+#nullable enable
+
+using System.Collections.Generic;
+using System.Threading.Tasks;
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Hosting;
+using Microsoft.Extensions.Primitives;
+using Moq;
+using TailoredApps.Shared.Payments;
+using TailoredApps.Shared.Payments.Provider.Adyen;
+using TailoredApps.Shared.Payments.Provider.CashBill;
+using TailoredApps.Shared.Payments.Provider.CashBill.Models;
+using TailoredApps.Shared.Payments.Provider.HotPay;
+using TailoredApps.Shared.Payments.Provider.PayNow;
+using TailoredApps.Shared.Payments.Provider.PayU;
+using TailoredApps.Shared.Payments.Provider.Przelewy24;
+using TailoredApps.Shared.Payments.Provider.Revolut;
+using TailoredApps.Shared.Payments.Provider.Stripe;
+using TailoredApps.Shared.Payments.Provider.Tpay;
+using Xunit;
+
+namespace TailoredApps.Shared.Payments.Tests;
+
+/// <summary>
+/// Mocked integration tests for all payment providers.
+/// These tests replace real HTTP calls with Moq stubs so the full DI + PaymentService
+/// pipeline can be exercised without a live sandbox environment.
+///
+/// When integration environments become available, create separate integration test projects
+/// with real credentials instead of extending or removing this file.
+/// </summary>
+public class MockedIntegrationTests
+{
+    // ─── Helpers ─────────────────────────────────────────────────────────────
+
+    private static PaymentRequest MakeRequest(string provider, string channel = "card") => new()
+    {
+        PaymentProvider = provider,
+        PaymentChannel = channel,
+        PaymentModel = PaymentModel.OneTime,
+        Title = "Test order",
+        Description = "Mocked integration test",
+        Currency = "PLN",
+        Amount = 9.99m,
+        Email = "test@example.com",
+        FirstName = "Jan",
+        Surname = "Kowalski",
+        AdditionalData = "test-ref-001",
+    };
+
+    // ══════════════════════════════════════════════════════════════════════════
+    // CashBill
+    // ══════════════════════════════════════════════════════════════════════════
+
+    private static IHost BuildCashBillHost(ICashbillServiceCaller caller)
+    {
+        return Host.CreateDefaultBuilder()
+            .ConfigureServices((_, services) =>
+            {
+                services.RegisterCashbillProvider();
+                // Override the real caller with our mock
+                services.AddTransient(_ => caller);
+                services.AddPayments()
+                    .RegisterPaymentProvider<CashBillProvider>();
+            })
+            .Build();
+    }
+
+    [Fact]
+    public async Task CashBill_RegisterPayment_ReturnsCreated()
+    {
+        var caller = new Mock<ICashbillServiceCaller>();
+        caller.Setup(c => c.GeneratePayment(It.IsAny<Provider.CashBill.PaymentRequest>()))
+              .ReturnsAsync(new PaymentStatus
+              {
+                  Id = "CB_TEST_001",
+                  Status = "Start",
+                  PaymentProviderRedirectUrl = "https://pay.cashbill.pl/test/CB_TEST_001",
+              });
+
+        var svc = BuildCashBillHost(caller.Object).Services.GetRequiredService<IPaymentService>();
+        var result = await svc.RegisterPayment(MakeRequest("Cashbill"));
+
+        Assert.Equal(PaymentStatusEnum.Created, result.PaymentStatus);
+        Assert.Equal("CB_TEST_001", result.PaymentUniqueId);
+        Assert.NotEmpty(result.RedirectUrl!);
+    }
+
+    [Fact]
+    public async Task CashBill_GetStatus_ReturnsCompleted()
+    {
+        var caller = new Mock<ICashbillServiceCaller>();
+        caller.Setup(c => c.GetPaymentStatus("CB_TEST_001"))
+              .ReturnsAsync(new PaymentStatus { Id = "CB_TEST_001", Status = "PositiveFinish" });
+
+        var svc = BuildCashBillHost(caller.Object).Services.GetRequiredService<IPaymentService>();
+        var result = await svc.GetStatus("Cashbill", "CB_TEST_001");
+
+        Assert.Equal(PaymentStatusEnum.Finished, result.PaymentStatus);
+    }
+
+    [Fact]
+    public async Task CashBill_GetChannels_ReturnsList()
+    {
+        var caller = new Mock<ICashbillServiceCaller>();
+        caller.Setup(c => c.GetPaymentChannels("PLN"))
+              .ReturnsAsync(new List<PaymentChannels>
+              {
+                  new() { Id = "blik_pbl", AvailableCurrencies = ["PLN"], Name = "BLIK" },
+                  new() { Id = "card_visa", AvailableCurrencies = ["PLN"], Name = "Karta Visa" },
+              });
+
+        var svc = BuildCashBillHost(caller.Object).Services.GetRequiredService<IPaymentService>();
+        var channels = await svc.GetChannels("Cashbill", "PLN");
+
+        Assert.NotEmpty(channels);
+        Assert.Contains(channels, c => c.Id == "blik_pbl");
+    }
+
+    [Fact]
+    public async Task CashBill_GetStatus_Negative_ReturnsFailed()
+    {
+        var caller = new Mock<ICashbillServiceCaller>();
+        caller.Setup(c => c.GetPaymentStatus("CB_FAIL"))
+              .ReturnsAsync(new PaymentStatus { Id = "CB_FAIL", Status = "NegativeFinish" });
+
+        var svc = BuildCashBillHost(caller.Object).Services.GetRequiredService<IPaymentService>();
+        var result = await svc.GetStatus("Cashbill", "CB_FAIL");
+
+        Assert.Equal(PaymentStatusEnum.Rejected, result.PaymentStatus);
+    }
+
+    [Fact]
+    public async Task CashBill_TransactionStatusChange_ValidSign_ReturnsStatus()
+    {
+        var caller = new Mock<ICashbillServiceCaller>();
+        caller.Setup(c => c.GetSignForNotificationService(It.IsAny<TransactionStatusChanged>()))
+              .ReturnsAsync("expectedsign");
+        caller.Setup(c => c.GetPaymentStatus("TX_001"))
+              .ReturnsAsync(new PaymentStatus { Id = "TX_001", Status = "PositiveFinish" });
+
+        var svc = BuildCashBillHost(caller.Object).Services.GetRequiredService<IPaymentService>();
+        var result = await svc.TransactionStatusChange("Cashbill", new TransactionStatusChangePayload
+        {
+            ProviderId = "Cashbill",
+            Payload = null,
+            QueryParameters = new Dictionary<string, StringValues>
+            {
+                { "cmd",  new StringValues("transactionStatusChanged") },
+                { "args", new StringValues("TX_001") },
+                { "sign", new StringValues("expectedsign") },
+            },
+        });
+
+        Assert.Equal(PaymentStatusEnum.Finished, result.PaymentStatus);
+    }
+
+    // ══════════════════════════════════════════════════════════════════════════
+    // Stripe
+    // ══════════════════════════════════════════════════════════════════════════
+
+    private static IHost BuildStripeHost(IStripeServiceCaller caller)
+    {
+        return Host.CreateDefaultBuilder()
+            .ConfigureServices((_, services) =>
+            {
+                services.RegisterStripeProvider();
+                services.AddTransient(_ => caller);
+                services.AddPayments()
+                    .RegisterPaymentProvider<StripeProvider>();
+            })
+            .Build();
+    }
+
+    [Fact]
+    public async Task Stripe_RegisterPayment_ReturnsCreated()
+    {
+        var session = new global::Stripe.Checkout.Session
+        {
+            Id = "cs_test_001",
+            Url = "https://checkout.stripe.com/pay/cs_test_001",
+        };
+
+        var caller = new Mock<IStripeServiceCaller>();
+        caller.Setup(c => c.CreateCheckoutSessionAsync(It.IsAny<PaymentRequest>()))
+              .ReturnsAsync(session);
+
+        var svc = BuildStripeHost(caller.Object).Services.GetRequiredService<IPaymentService>();
+        var result = await svc.RegisterPayment(MakeRequest("Stripe"));
+
+        Assert.Equal(PaymentStatusEnum.Created, result.PaymentStatus);
+        Assert.Equal("cs_test_001", result.PaymentUniqueId);
+        Assert.Equal("https://checkout.stripe.com/pay/cs_test_001", result.RedirectUrl);
+    }
+
+    [Fact]
+    public async Task Stripe_GetStatus_CompleteSession_ReturnsFinished()
+    {
+        var session = new global::Stripe.Checkout.Session
+        {
+            Id = "cs_test_002",
+            Status = "complete",
+            PaymentStatus = "paid",
+        };
+
+        var caller = new Mock<IStripeServiceCaller>();
+        caller.Setup(c => c.GetCheckoutSessionAsync("cs_test_002"))
+              .ReturnsAsync(session);
+
+        var svc = BuildStripeHost(caller.Object).Services.GetRequiredService<IPaymentService>();
+        var result = await svc.GetStatus("Stripe", "cs_test_002");
+
+        Assert.Equal(PaymentStatusEnum.Finished, result.PaymentStatus);
+    }
+
+    [Fact]
+    public async Task Stripe_GetStatus_OpenSession_ReturnsCreated()
+    {
+        var session = new global::Stripe.Checkout.Session
+        {
+            Id = "cs_test_003",
+            Status = "open",
+            PaymentStatus = "unpaid",
+        };
+
+        var caller = new Mock<IStripeServiceCaller>();
+        caller.Setup(c => c.GetCheckoutSessionAsync("cs_test_003"))
+              .ReturnsAsync(session);
+
+        var svc = BuildStripeHost(caller.Object).Services.GetRequiredService<IPaymentService>();
+        var result = await svc.GetStatus("Stripe", "cs_test_003");
+
+        Assert.Equal(PaymentStatusEnum.Created, result.PaymentStatus);
+    }
+
+    [Fact]
+    public async Task Stripe_TransactionStatusChange_CheckoutCompleted_ReturnsCompleted()
+    {
+        var stripeEvent = new global::Stripe.Event
+        {
+            Type = "checkout.session.completed",
+            Data = new global::Stripe.EventData
+            {
+                Object = new global::Stripe.Checkout.Session
+                {
+                    Id = "cs_test_004",
+                    PaymentStatus = "paid",
+                },
+            },
+        };
+
+        var caller = new Mock<IStripeServiceCaller>();
+        caller.Setup(c => c.ConstructWebhookEvent(It.IsAny<string>(), It.IsAny<string>()))
+              .Returns(stripeEvent);
+
+        var svc = BuildStripeHost(caller.Object).Services.GetRequiredService<IPaymentService>();
+        var result = await svc.TransactionStatusChange("Stripe", new TransactionStatusChangePayload
+        {
+            ProviderId = "Stripe",
+            Payload = """{"id":"evt_test","type":"checkout.session.completed"}""",
+            QueryParameters = new Dictionary<string, StringValues>
+            {
+                { "Stripe-Signature", new StringValues("t=1,v1=mocksignature") },
+            },
+        });
+
+        Assert.Equal(PaymentStatusEnum.Finished, result.PaymentStatus);
+    }
+
+    [Fact]
+    public async Task Stripe_TransactionStatusChange_PaymentFailed_ReturnsFailed()
+    {
+        var stripeEvent = new global::Stripe.Event
+        {
+            Type = "payment_intent.payment_failed",
+            Data = new global::Stripe.EventData
+            {
+                Object = new global::Stripe.PaymentIntent { Id = "pi_fail" },
+            },
+        };
+
+        var caller = new Mock<IStripeServiceCaller>();
+        caller.Setup(c => c.ConstructWebhookEvent(It.IsAny<string>(), It.IsAny<string>()))
+              .Returns(stripeEvent);
+
+        var svc = BuildStripeHost(caller.Object).Services.GetRequiredService<IPaymentService>();
+        var result = await svc.TransactionStatusChange("Stripe", new TransactionStatusChangePayload
+        {
+            ProviderId = "Stripe",
+            Payload = """{"id":"evt_fail","type":"payment_intent.payment_failed"}""",
+            QueryParameters = new Dictionary<string, StringValues>
+            {
+                { "Stripe-Signature", new StringValues("t=1,v1=mocksignature") },
+            },
+        });
+
+        Assert.Equal(PaymentStatusEnum.Rejected, result.PaymentStatus);
+    }
+
+    // ══════════════════════════════════════════════════════════════════════════
+    // Adyen
+    // ══════════════════════════════════════════════════════════════════════════
+
+    private static IHost BuildAdyenHost(IAdyenServiceCaller caller)
+    {
+        return Host.CreateDefaultBuilder()
+            .ConfigureServices((_, services) =>
+            {
+                services.RegisterAdyenProvider();
+                services.AddTransient(_ => caller);
+                services.AddPayments()
+                    .RegisterPaymentProvider<AdyenProvider>();
+            })
+            .Build();
+    }
+
+    [Fact]
+    public async Task Adyen_RegisterPayment_ReturnsCreated()
+    {
+        var caller = new Mock<IAdyenServiceCaller>();
+        caller.Setup(c => c.CreateSessionAsync(It.IsAny<PaymentRequest>()))
+              .ReturnsAsync(("session_adyen_001", "https://checkout.adyen.com/pay/session_adyen_001", null));
+
+        var svc = BuildAdyenHost(caller.Object).Services.GetRequiredService<IPaymentService>();
+        var result = await svc.RegisterPayment(MakeRequest("Adyen"));
+
+        Assert.Equal(PaymentStatusEnum.Created, result.PaymentStatus);
+        Assert.Equal("session_adyen_001", result.PaymentUniqueId);
+        Assert.NotEmpty(result.RedirectUrl!);
+    }
+
+    [Fact]
+    public async Task Adyen_RegisterPayment_Error_ReturnsRejected()
+    {
+        var caller = new Mock<IAdyenServiceCaller>();
+        caller.Setup(c => c.CreateSessionAsync(It.IsAny<PaymentRequest>()))
+              .ReturnsAsync(((string?)null, (string?)null, "Unauthorized"));
+
+        var svc = BuildAdyenHost(caller.Object).Services.GetRequiredService<IPaymentService>();
+        var result = await svc.RegisterPayment(MakeRequest("Adyen"));
+
+        Assert.Equal(PaymentStatusEnum.Rejected, result.PaymentStatus);
+    }
+
+    [Fact]
+    public async Task Adyen_GetStatus_ReturnsCompleted()
+    {
+        var caller = new Mock<IAdyenServiceCaller>();
+        caller.Setup(c => c.GetPaymentStatusAsync("adyen_ref_001"))
+              .ReturnsAsync(PaymentStatusEnum.Finished);
+
+        var svc = BuildAdyenHost(caller.Object).Services.GetRequiredService<IPaymentService>();
+        var result = await svc.GetStatus("Adyen", "adyen_ref_001");
+
+        Assert.Equal(PaymentStatusEnum.Finished, result.PaymentStatus);
+    }
+
+    [Fact]
+    public async Task Adyen_TransactionStatusChange_ValidHmac_ReturnsStatus()
+    {
+        var caller = new Mock<IAdyenServiceCaller>();
+        caller.Setup(c => c.VerifyNotificationHmac(It.IsAny<string>(), "valid_hmac"))
+              .Returns(true);
+
+        var svc = BuildAdyenHost(caller.Object).Services.GetRequiredService<IPaymentService>();
+        var body = """{"pspReference":"adyen_ref_002","success":"true","eventCode":"AUTHORISATION"}""";
+        var result = await svc.TransactionStatusChange("Adyen", new TransactionStatusChangePayload
+        {
+            ProviderId = "Adyen",
+            Payload = body,
+            QueryParameters = new Dictionary<string, StringValues>
+            {
+                { "HmacSignature", new StringValues("valid_hmac") },
+            },
+        });
+
+        Assert.Equal(PaymentStatusEnum.Finished, result.PaymentStatus);
+    }
+
+    // ══════════════════════════════════════════════════════════════════════════
+    // PayU
+    // ══════════════════════════════════════════════════════════════════════════
+
+    private static IHost BuildPayUHost(IPayUServiceCaller caller)
+    {
+        return Host.CreateDefaultBuilder()
+            .ConfigureServices((_, services) =>
+            {
+                services.RegisterPayUProvider();
+                services.AddTransient(_ => caller);
+                services.AddPayments()
+                    .RegisterPaymentProvider<PayUProvider>();
+            })
+            .Build();
+    }
+
+    [Fact]
+    public async Task PayU_RegisterPayment_ReturnsCreated()
+    {
+        var caller = new Mock<IPayUServiceCaller>();
+        caller.Setup(c => c.GetAccessTokenAsync()).ReturnsAsync("tok_001");
+        caller.Setup(c => c.CreateOrderAsync("tok_001", It.IsAny<PaymentRequest>()))
+              .ReturnsAsync(("order_payu_001", "https://secure.payu.com/pay/order_payu_001", null));
+
+        var svc = BuildPayUHost(caller.Object).Services.GetRequiredService<IPaymentService>();
+        var result = await svc.RegisterPayment(MakeRequest("PayU", "blik"));
+
+        Assert.Equal(PaymentStatusEnum.Created, result.PaymentStatus);
+        Assert.Equal("order_payu_001", result.PaymentUniqueId);
+    }
+
+    [Fact]
+    public async Task PayU_RegisterPayment_Error_ReturnsRejected()
+    {
+        var caller = new Mock<IPayUServiceCaller>();
+        caller.Setup(c => c.GetAccessTokenAsync()).ReturnsAsync("tok_002");
+        caller.Setup(c => c.CreateOrderAsync("tok_002", It.IsAny<PaymentRequest>()))
+              .ReturnsAsync(((string?)null, (string?)null, "Unauthorized"));
+
+        var svc = BuildPayUHost(caller.Object).Services.GetRequiredService<IPaymentService>();
+        var result = await svc.RegisterPayment(MakeRequest("PayU"));
+
+        Assert.Equal(PaymentStatusEnum.Rejected, result.PaymentStatus);
+    }
+
+    [Fact]
+    public async Task PayU_GetStatus_ReturnsCompleted()
+    {
+        var caller = new Mock<IPayUServiceCaller>();
+        caller.Setup(c => c.GetAccessTokenAsync()).ReturnsAsync("tok_003");
+        caller.Setup(c => c.GetOrderStatusAsync("tok_003", "order_payu_002"))
+              .ReturnsAsync(PaymentStatusEnum.Finished);
+
+        var svc = BuildPayUHost(caller.Object).Services.GetRequiredService<IPaymentService>();
+        var result = await svc.GetStatus("PayU", "order_payu_002");
+
+        Assert.Equal(PaymentStatusEnum.Finished, result.PaymentStatus);
+    }
+
+    [Fact]
+    public async Task PayU_TransactionStatusChange_ValidSignature_ReturnsCompleted()
+    {
+        var caller = new Mock<IPayUServiceCaller>();
+        caller.Setup(c => c.VerifySignature(It.IsAny<string>(), It.IsAny<string>()))
+              .Returns(true);
+
+        var svc = BuildPayUHost(caller.Object).Services.GetRequiredService<IPaymentService>();
+        var body = """{"order":{"status":"COMPLETED","orderId":"order_payu_003"}}""";
+        var result = await svc.TransactionStatusChange("PayU", new TransactionStatusChangePayload
+        {
+            ProviderId = "PayU",
+            Payload = body,
+            QueryParameters = new Dictionary<string, StringValues>
+            {
+                { "OpenPayU-Signature", new StringValues("sender=checkout;signature=valid;algorithm=MD5;content=DOCUMENT") },
+            },
+        });
+
+        Assert.Equal(PaymentStatusEnum.Finished, result.PaymentStatus);
+    }
+
+    [Fact]
+    public async Task PayU_TransactionStatusChange_InvalidSignature_ReturnsRejected()
+    {
+        var caller = new Mock<IPayUServiceCaller>();
+        caller.Setup(c => c.VerifySignature(It.IsAny<string>(), It.IsAny<string>()))
+              .Returns(false);
+
+        var svc = BuildPayUHost(caller.Object).Services.GetRequiredService<IPaymentService>();
+        var result = await svc.TransactionStatusChange("PayU", new TransactionStatusChangePayload
+        {
+            ProviderId = "PayU",
+            Payload = """{"order":{"status":"COMPLETED"}}""",
+            QueryParameters = new Dictionary<string, StringValues>
+            {
+                { "OpenPayU-Signature", new StringValues("sender=checkout;signature=bad;algorithm=MD5;content=DOCUMENT") },
+            },
+        });
+
+        Assert.Equal(PaymentStatusEnum.Rejected, result.PaymentStatus);
+    }
+
+    // ══════════════════════════════════════════════════════════════════════════
+    // Przelewy24
+    // ══════════════════════════════════════════════════════════════════════════
+
+    private static IHost BuildPrzelewy24Host(IPrzelewy24ServiceCaller caller)
+    {
+        return Host.CreateDefaultBuilder()
+            .ConfigureServices((_, services) =>
+            {
+                services.RegisterPrzelewy24Provider();
+                services.AddTransient(_ => caller);
+                services.AddPayments()
+                    .RegisterPaymentProvider<Przelewy24Provider>();
+            })
+            .Build();
+    }
+
+    [Fact]
+    public async Task Przelewy24_RegisterPayment_ReturnsCreated()
+    {
+        var caller = new Mock<IPrzelewy24ServiceCaller>();
+        caller.Setup(c => c.ComputeSign(It.IsAny<string>(), It.IsAny<int>(), It.IsAny<long>(), It.IsAny<string>()))
+              .Returns("mock_sign");
+        caller.Setup(c => c.RegisterTransactionAsync(It.IsAny<PaymentRequest>(), It.IsAny<string>()))
+              .ReturnsAsync(("p24_token_001", null));
+
+        var svc = BuildPrzelewy24Host(caller.Object).Services.GetRequiredService<IPaymentService>();
+        var result = await svc.RegisterPayment(MakeRequest("Przelewy24", "online_transfer"));
+
+        Assert.Equal(PaymentStatusEnum.Created, result.PaymentStatus);
+        Assert.NotEmpty(result.RedirectUrl!);
+    }
+
+    [Fact]
+    public async Task Przelewy24_RegisterPayment_Error_ReturnsRejected()
+    {
+        var caller = new Mock<IPrzelewy24ServiceCaller>();
+        caller.Setup(c => c.ComputeSign(It.IsAny<string>(), It.IsAny<int>(), It.IsAny<long>(), It.IsAny<string>()))
+              .Returns("mock_sign");
+        caller.Setup(c => c.RegisterTransactionAsync(It.IsAny<PaymentRequest>(), It.IsAny<string>()))
+              .ReturnsAsync(((string?)null, "Unauthorized"));
+
+        var svc = BuildPrzelewy24Host(caller.Object).Services.GetRequiredService<IPaymentService>();
+        var result = await svc.RegisterPayment(MakeRequest("Przelewy24"));
+
+        Assert.Equal(PaymentStatusEnum.Rejected, result.PaymentStatus);
+    }
+
+    [Fact]
+    public async Task Przelewy24_TransactionStatusChange_ValidNotification_ReturnsCompleted()
+    {
+        var caller = new Mock<IPrzelewy24ServiceCaller>();
+        caller.Setup(c => c.VerifyNotification(It.IsAny<string>())).Returns(true);
+        caller.Setup(c => c.ComputeSign(It.IsAny<string>(), It.IsAny<int>(), It.IsAny<long>(), It.IsAny<string>()))
+              .Returns("mock_sign");
+        caller.Setup(c => c.VerifyTransactionAsync(It.IsAny<string>(), It.IsAny<long>(), It.IsAny<string>(), It.IsAny<int>()))
+              .ReturnsAsync(PaymentStatusEnum.Finished);
+
+        var svc = BuildPrzelewy24Host(caller.Object).Services.GetRequiredService<IPaymentService>();
+        var body = """{"merchantId":1234,"posId":1234,"sessionId":"sess_001","amount":999,"originAmount":999,"currency":"PLN","orderId":5678,"sign":"valid_sign"}""";
+        var result = await svc.TransactionStatusChange("Przelewy24", new TransactionStatusChangePayload
+        {
+            ProviderId = "Przelewy24",
+            Payload = body,
+            QueryParameters = new Dictionary<string, StringValues>(),
+        });
+
+        Assert.Equal(PaymentStatusEnum.Finished, result.PaymentStatus);
+    }
+
+    [Fact]
+    public async Task Przelewy24_TransactionStatusChange_InvalidNotification_ReturnsRejected()
+    {
+        var caller = new Mock<IPrzelewy24ServiceCaller>();
+        caller.Setup(c => c.VerifyNotification(It.IsAny<string>())).Returns(false);
+
+        var svc = BuildPrzelewy24Host(caller.Object).Services.GetRequiredService<IPaymentService>();
+        var result = await svc.TransactionStatusChange("Przelewy24", new TransactionStatusChangePayload
+        {
+            ProviderId = "Przelewy24",
+            Payload = """{"merchantId":0,"posId":0,"sessionId":"x","amount":0,"orderId":0,"sign":"bad"}""",
+            QueryParameters = new Dictionary<string, StringValues>(),
+        });
+
+        Assert.Equal(PaymentStatusEnum.Rejected, result.PaymentStatus);
+    }
+
+    // ══════════════════════════════════════════════════════════════════════════
+    // Tpay
+    // ══════════════════════════════════════════════════════════════════════════
+
+    private static IHost BuildTpayHost(ITpayServiceCaller caller)
+    {
+        return Host.CreateDefaultBuilder()
+            .ConfigureServices((_, services) =>
+            {
+                services.RegisterTpayProvider();
+                services.AddTransient(_ => caller);
+                services.AddPayments()
+                    .RegisterPaymentProvider<TpayProvider>();
+            })
+            .Build();
+    }
+
+    [Fact]
+    public async Task Tpay_RegisterPayment_ReturnsCreated()
+    {
+        var caller = new Mock<ITpayServiceCaller>();
+        caller.Setup(c => c.GetAccessTokenAsync()).ReturnsAsync("tpay_tok_001");
+        caller.Setup(c => c.CreateTransactionAsync("tpay_tok_001", It.IsAny<PaymentRequest>()))
+              .ReturnsAsync(("tpay_tx_001", "https://secure.tpay.com/pay/tpay_tx_001"));
+
+        var svc = BuildTpayHost(caller.Object).Services.GetRequiredService<IPaymentService>();
+        var result = await svc.RegisterPayment(MakeRequest("Tpay"));
+
+        Assert.Equal(PaymentStatusEnum.Created, result.PaymentStatus);
+        Assert.Equal("tpay_tx_001", result.PaymentUniqueId);
+        Assert.Equal("https://secure.tpay.com/pay/tpay_tx_001", result.RedirectUrl);
+    }
+
+    [Fact]
+    public async Task Tpay_RegisterPayment_NullResult_ReturnsRejected()
+    {
+        var caller = new Mock<ITpayServiceCaller>();
+        caller.Setup(c => c.GetAccessTokenAsync()).ReturnsAsync("tpay_tok_002");
+        caller.Setup(c => c.CreateTransactionAsync("tpay_tok_002", It.IsAny<PaymentRequest>()))
+              .ReturnsAsync(((string?)null, (string?)null));
+
+        var svc = BuildTpayHost(caller.Object).Services.GetRequiredService<IPaymentService>();
+        var result = await svc.RegisterPayment(MakeRequest("Tpay"));
+
+        Assert.Equal(PaymentStatusEnum.Rejected, result.PaymentStatus);
+    }
+
+    [Fact]
+    public async Task Tpay_GetStatus_ReturnsCompleted()
+    {
+        var caller = new Mock<ITpayServiceCaller>();
+        caller.Setup(c => c.GetAccessTokenAsync()).ReturnsAsync("tpay_tok_003");
+        caller.Setup(c => c.GetTransactionStatusAsync("tpay_tok_003", "tpay_tx_002"))
+              .ReturnsAsync(PaymentStatusEnum.Finished);
+
+        var svc = BuildTpayHost(caller.Object).Services.GetRequiredService<IPaymentService>();
+        var result = await svc.GetStatus("Tpay", "tpay_tx_002");
+
+        Assert.Equal(PaymentStatusEnum.Finished, result.PaymentStatus);
+    }
+
+    [Fact]
+    public async Task Tpay_TransactionStatusChange_ValidSignature_ReturnsCompleted()
+    {
+        var caller = new Mock<ITpayServiceCaller>();
+        caller.Setup(c => c.VerifyNotification(It.IsAny<string>(), "valid_sig"))
+              .Returns(true);
+
+        var svc = BuildTpayHost(caller.Object).Services.GetRequiredService<IPaymentService>();
+        var body = """{"transactionId":"tpay_tx_003","status":"correct"}""";
+        var result = await svc.TransactionStatusChange("Tpay", new TransactionStatusChangePayload
+        {
+            ProviderId = "Tpay",
+            Payload = body,
+            QueryParameters = new Dictionary<string, StringValues>
+            {
+                { "X-Signature", new StringValues("valid_sig") },
+            },
+        });
+
+        Assert.Equal(PaymentStatusEnum.Finished, result.PaymentStatus);
+    }
+
+    // ══════════════════════════════════════════════════════════════════════════
+    // HotPay
+    // ══════════════════════════════════════════════════════════════════════════
+
+    private static IHost BuildHotPayHost(IHotPayServiceCaller caller)
+    {
+        return Host.CreateDefaultBuilder()
+            .ConfigureServices((_, services) =>
+            {
+                services.RegisterHotPayProvider();
+                services.AddTransient(_ => caller);
+                services.AddPayments()
+                    .RegisterPaymentProvider<HotPayProvider>();
+            })
+            .Build();
+    }
+
+    [Fact]
+    public async Task HotPay_RegisterPayment_ReturnsCreated()
+    {
+        var caller = new Mock<IHotPayServiceCaller>();
+        caller.Setup(c => c.InitPaymentAsync(It.IsAny<PaymentRequest>(), It.IsAny<string>()))
+              .ReturnsAsync(("hotpay_001", "https://pay.hotpay.pl/hotpay_001"));
+
+        var svc = BuildHotPayHost(caller.Object).Services.GetRequiredService<IPaymentService>();
+        var result = await svc.RegisterPayment(MakeRequest("HotPay"));
+
+        Assert.Equal(PaymentStatusEnum.Created, result.PaymentStatus);
+        Assert.NotEmpty(result.PaymentUniqueId!);
+        Assert.Equal("https://pay.hotpay.pl/hotpay_001", result.RedirectUrl);
+    }
+
+    [Fact]
+    public async Task HotPay_RegisterPayment_NullResult_ReturnsRejected()
+    {
+        var caller = new Mock<IHotPayServiceCaller>();
+        caller.Setup(c => c.InitPaymentAsync(It.IsAny<PaymentRequest>(), It.IsAny<string>()))
+              .ReturnsAsync(((string?)null, (string?)null));
+
+        var svc = BuildHotPayHost(caller.Object).Services.GetRequiredService<IPaymentService>();
+        var result = await svc.RegisterPayment(MakeRequest("HotPay"));
+
+        Assert.Equal(PaymentStatusEnum.Rejected, result.PaymentStatus);
+    }
+
+    [Fact]
+    public async Task HotPay_TransactionStatusChange_ValidHash_ReturnsCompleted()
+    {
+        var caller = new Mock<IHotPayServiceCaller>();
+        caller.Setup(c => c.VerifyNotification("valid_hash", "9.99", "hotpay_001", "SUCCESS"))
+              .Returns(true);
+
+        var svc = BuildHotPayHost(caller.Object).Services.GetRequiredService<IPaymentService>();
+        var result = await svc.TransactionStatusChange("HotPay", new TransactionStatusChangePayload
+        {
+            ProviderId = "HotPay",
+            Payload = string.Empty,
+            QueryParameters = new Dictionary<string, StringValues>
+            {
+                { "HASH",         new StringValues("valid_hash") },
+                { "KWOTA",        new StringValues("9.99") },
+                { "ID_PLATNOSCI", new StringValues("hotpay_001") },
+                { "STATUS",       new StringValues("SUCCESS") },
+            },
+        });
+
+        Assert.Equal(PaymentStatusEnum.Finished, result.PaymentStatus);
+    }
+
+    [Fact]
+    public async Task HotPay_TransactionStatusChange_ValidHash_Failure_ReturnsFailed()
+    {
+        var caller = new Mock<IHotPayServiceCaller>();
+        caller.Setup(c => c.VerifyNotification("valid_hash_fail", "9.99", "hotpay_002", "FAILURE"))
+              .Returns(true);
+
+        var svc = BuildHotPayHost(caller.Object).Services.GetRequiredService<IPaymentService>();
+        var result = await svc.TransactionStatusChange("HotPay", new TransactionStatusChangePayload
+        {
+            ProviderId = "HotPay",
+            Payload = string.Empty,
+            QueryParameters = new Dictionary<string, StringValues>
+            {
+                { "HASH",         new StringValues("valid_hash_fail") },
+                { "KWOTA",        new StringValues("9.99") },
+                { "ID_PLATNOSCI", new StringValues("hotpay_002") },
+                { "STATUS",       new StringValues("FAILURE") },
+            },
+        });
+
+        Assert.Equal(PaymentStatusEnum.Rejected, result.PaymentStatus);
+    }
+
+    // ══════════════════════════════════════════════════════════════════════════
+    // PayNow
+    // ══════════════════════════════════════════════════════════════════════════
+
+    private static IHost BuildPayNowHost(IPayNowServiceCaller caller)
+    {
+        return Host.CreateDefaultBuilder()
+            .ConfigureServices((_, services) =>
+            {
+                services.RegisterPayNowProvider();
+                services.AddTransient(_ => caller);
+                services.AddPayments()
+                    .RegisterPaymentProvider<PayNowProvider>();
+            })
+            .Build();
+    }
+
+    [Fact]
+    public async Task PayNow_RegisterPayment_ReturnsCreated()
+    {
+        var caller = new Mock<IPayNowServiceCaller>();
+        caller.Setup(c => c.CreatePaymentAsync(It.IsAny<PaymentRequest>()))
+              .ReturnsAsync(("paynow_001", "https://app.paynow.pl/pay/paynow_001"));
+
+        var svc = BuildPayNowHost(caller.Object).Services.GetRequiredService<IPaymentService>();
+        var result = await svc.RegisterPayment(MakeRequest("PayNow", "BLIK"));
+
+        Assert.Equal(PaymentStatusEnum.Created, result.PaymentStatus);
+        Assert.Equal("paynow_001", result.PaymentUniqueId);
+        Assert.Equal("https://app.paynow.pl/pay/paynow_001", result.RedirectUrl);
+    }
+
+    [Fact]
+    public async Task PayNow_RegisterPayment_NullResult_ReturnsRejected()
+    {
+        var caller = new Mock<IPayNowServiceCaller>();
+        caller.Setup(c => c.CreatePaymentAsync(It.IsAny<PaymentRequest>()))
+              .ReturnsAsync(((string?)null, (string?)null));
+
+        var svc = BuildPayNowHost(caller.Object).Services.GetRequiredService<IPaymentService>();
+        var result = await svc.RegisterPayment(MakeRequest("PayNow"));
+
+        Assert.Equal(PaymentStatusEnum.Rejected, result.PaymentStatus);
+    }
+
+    [Fact]
+    public async Task PayNow_GetStatus_ReturnsCompleted()
+    {
+        var caller = new Mock<IPayNowServiceCaller>();
+        caller.Setup(c => c.GetPaymentStatusAsync("paynow_002"))
+              .ReturnsAsync(PaymentStatusEnum.Finished);
+
+        var svc = BuildPayNowHost(caller.Object).Services.GetRequiredService<IPaymentService>();
+        var result = await svc.GetStatus("PayNow", "paynow_002");
+
+        Assert.Equal(PaymentStatusEnum.Finished, result.PaymentStatus);
+    }
+
+    [Fact]
+    public async Task PayNow_TransactionStatusChange_ValidSignature_ReturnsCompleted()
+    {
+        var caller = new Mock<IPayNowServiceCaller>();
+        caller.Setup(c => c.VerifySignature(It.IsAny<string>(), "valid_sig"))
+              .Returns(true);
+
+        var svc = BuildPayNowHost(caller.Object).Services.GetRequiredService<IPaymentService>();
+        var body = """{"paymentId":"paynow_003","status":"CONFIRMED"}""";
+        var result = await svc.TransactionStatusChange("PayNow", new TransactionStatusChangePayload
+        {
+            ProviderId = "PayNow",
+            Payload = body,
+            QueryParameters = new Dictionary<string, StringValues>
+            {
+                { "Signature", new StringValues("valid_sig") },
+            },
+        });
+
+        Assert.Equal(PaymentStatusEnum.Finished, result.PaymentStatus);
+    }
+
+    // ══════════════════════════════════════════════════════════════════════════
+    // Revolut
+    // ══════════════════════════════════════════════════════════════════════════
+
+    private static IHost BuildRevolutHost(IRevolutServiceCaller caller)
+    {
+        return Host.CreateDefaultBuilder()
+            .ConfigureServices((_, services) =>
+            {
+                services.RegisterRevolutProvider();
+                services.AddTransient(_ => caller);
+                services.AddPayments()
+                    .RegisterPaymentProvider<RevolutProvider>();
+            })
+            .Build();
+    }
+
+    [Fact]
+    public async Task Revolut_RegisterPayment_ReturnsCreated()
+    {
+        var caller = new Mock<IRevolutServiceCaller>();
+        caller.Setup(c => c.CreateOrderAsync(It.IsAny<PaymentRequest>()))
+              .ReturnsAsync(("rev_order_001", "https://checkout.revolut.com/pay/rev_order_001"));
+
+        var svc = BuildRevolutHost(caller.Object).Services.GetRequiredService<IPaymentService>();
+        var result = await svc.RegisterPayment(MakeRequest("Revolut", "card"));
+
+        Assert.Equal(PaymentStatusEnum.Created, result.PaymentStatus);
+        Assert.Equal("rev_order_001", result.PaymentUniqueId);
+        Assert.Equal("https://checkout.revolut.com/pay/rev_order_001", result.RedirectUrl);
+    }
+
+    [Fact]
+    public async Task Revolut_RegisterPayment_NullResult_ReturnsRejected()
+    {
+        var caller = new Mock<IRevolutServiceCaller>();
+        caller.Setup(c => c.CreateOrderAsync(It.IsAny<PaymentRequest>()))
+              .ReturnsAsync(((string?)null, (string?)null));
+
+        var svc = BuildRevolutHost(caller.Object).Services.GetRequiredService<IPaymentService>();
+        var result = await svc.RegisterPayment(MakeRequest("Revolut"));
+
+        Assert.Equal(PaymentStatusEnum.Rejected, result.PaymentStatus);
+    }
+
+    [Fact]
+    public async Task Revolut_GetStatus_Completed_ReturnsCompleted()
+    {
+        var caller = new Mock<IRevolutServiceCaller>();
+        caller.Setup(c => c.GetOrderAsync("rev_order_002"))
+              .ReturnsAsync(("completed", "rev_order_002"));
+
+        var svc = BuildRevolutHost(caller.Object).Services.GetRequiredService<IPaymentService>();
+        var result = await svc.GetStatus("Revolut", "rev_order_002");
+
+        Assert.Equal(PaymentStatusEnum.Finished, result.PaymentStatus);
+    }
+
+    [Fact]
+    public async Task Revolut_GetStatus_Pending_ReturnsProcessing()
+    {
+        var caller = new Mock<IRevolutServiceCaller>();
+        caller.Setup(c => c.GetOrderAsync("rev_order_003"))
+              .ReturnsAsync(("pending", "rev_order_003"));
+
+        var svc = BuildRevolutHost(caller.Object).Services.GetRequiredService<IPaymentService>();
+        var result = await svc.GetStatus("Revolut", "rev_order_003");
+
+        Assert.Equal(PaymentStatusEnum.Processing, result.PaymentStatus);
+    }
+
+    [Fact]
+    public async Task Revolut_TransactionStatusChange_ValidSignature_ReturnsCompleted()
+    {
+        var caller = new Mock<IRevolutServiceCaller>();
+        caller.Setup(c => c.VerifyWebhookSignature(It.IsAny<string>(), "1711000000", "v1=valid_sig"))
+              .Returns(true);
+
+        var svc = BuildRevolutHost(caller.Object).Services.GetRequiredService<IPaymentService>();
+        var body = """{"order_id":"rev_order_004","event":"ORDER_COMPLETED"}""";
+        var result = await svc.TransactionStatusChange("Revolut", new TransactionStatusChangePayload
+        {
+            ProviderId = "Revolut",
+            Payload = body,
+            QueryParameters = new Dictionary<string, StringValues>
+            {
+                { "Revolut-Request-Timestamp", new StringValues("1711000000") },
+                { "Revolut-Signature",         new StringValues("v1=valid_sig") },
+            },
+        });
+
+        Assert.Equal(PaymentStatusEnum.Finished, result.PaymentStatus);
+    }
+}
diff --git a/tests/TailoredApps.Shared.Payments.Tests/MultiProviderPaymentTest.cs b/tests/TailoredApps.Shared.Payments.Tests/MultiProviderPaymentTest.cs
index d53e83c..00b272e 100644
--- a/tests/TailoredApps.Shared.Payments.Tests/MultiProviderPaymentTest.cs
+++ b/tests/TailoredApps.Shared.Payments.Tests/MultiProviderPaymentTest.cs
@@ -1,264 +1,264 @@
-using System.Collections.Generic;
-using System.Linq;
-using System.Threading.Tasks;
-using Microsoft.Extensions.Configuration;
-using Microsoft.Extensions.DependencyInjection;
-using Microsoft.Extensions.Hosting;
-using Microsoft.Extensions.Primitives;
-using TailoredApps.Shared.Payments;
-using TailoredApps.Shared.Payments.Provider.Adyen;
-using TailoredApps.Shared.Payments.Provider.HotPay;
-using TailoredApps.Shared.Payments.Provider.PayNow;
-using TailoredApps.Shared.Payments.Provider.PayU;
-using TailoredApps.Shared.Payments.Provider.Przelewy24;
-using TailoredApps.Shared.Payments.Provider.Revolut;
-using TailoredApps.Shared.Payments.Provider.Tpay;
-using Xunit;
-
-namespace TailoredApps.Shared.Payments.Tests;
-
-/// <summary>
-/// Smoke testy dla 7 nowych providerów płatności.
-/// Testy jednostkowe — nie wymagają połączenia sieciowego.
-/// </summary>
-public class MultiProviderPaymentTest
-{
-    private static IHost BuildHost() =>
-        Host.CreateDefaultBuilder()
-            .ConfigureAppConfiguration(cfg => cfg.AddJsonFile("appsettings.json", optional: true))
-            .ConfigureServices((_, services) =>
-            {
-                services.RegisterAdyenProvider();
-                services.RegisterPayUProvider();
-                services.RegisterPrzelewy24Provider();
-                services.RegisterTpayProvider();
-                services.RegisterHotPayProvider();
-                services.RegisterPayNowProvider();
-                services.RegisterRevolutProvider();
-
-                services.AddPayments()
-                    .RegisterPaymentProvider<AdyenProvider>()
-                    .RegisterPaymentProvider<PayUProvider>()
-                    .RegisterPaymentProvider<Przelewy24Provider>()
-                    .RegisterPaymentProvider<TpayProvider>()
-                    .RegisterPaymentProvider<HotPayProvider>()
-                    .RegisterPaymentProvider<PayNowProvider>()
-                    .RegisterPaymentProvider<RevolutProvider>();
-            })
-            .Build();
-
-    // ─── Provider metadata ────────────────────────────────────────────────────
-
-    [Fact]
-    public async Task AllProviders_AreRegistered()
-    {
-        var host      = BuildHost();
-        var service   = host.Services.GetRequiredService<IPaymentService>();
-        var providers = await service.GetProviders();
-        var ids       = providers.Select(p => p.Id).ToList();
-
-        Assert.Contains("Adyen",      ids);
-        Assert.Contains("PayU",       ids);
-        Assert.Contains("Przelewy24", ids);
-        Assert.Contains("Tpay",       ids);
-        Assert.Contains("HotPay",     ids);
-        Assert.Contains("PayNow",     ids);
-        Assert.Contains("Revolut",    ids);
-    }
-
-    // ─── GetChannels ──────────────────────────────────────────────────────────
-
-    [Theory]
-    [InlineData("Adyen",      "PLN")]
-    [InlineData("PayU",       "PLN")]
-    [InlineData("Przelewy24", "PLN")]
-    [InlineData("Tpay",       "PLN")]
-    [InlineData("HotPay",     "PLN")]
-    [InlineData("PayNow",     "PLN")]
-    [InlineData("Revolut",    "PLN")]
-    public async Task GetChannels_PLN_ReturnsNonEmptyList(string providerKey, string currency)
-    {
-        var host     = BuildHost();
-        var service  = host.Services.GetRequiredService<IPaymentService>();
-        var channels = await service.GetChannels(providerKey, currency);
-        Assert.NotEmpty(channels);
-    }
-
-    [Fact]
-    public async Task Adyen_GetChannels_EUR_ContainsIdeal()
-    {
-        var host     = BuildHost();
-        var service  = host.Services.GetRequiredService<IPaymentService>();
-        var channels = await service.GetChannels("Adyen", "EUR");
-        Assert.Contains(channels, c => c.Id == "ideal");
-    }
-
-    [Fact]
-    public async Task PayU_GetChannels_PLN_ContainsBlik()
-    {
-        var host     = BuildHost();
-        var service  = host.Services.GetRequiredService<IPaymentService>();
-        var channels = await service.GetChannels("PayU", "PLN");
-        Assert.Contains(channels, c => c.Id == "blik");
-    }
-
-    [Fact]
-    public async Task Revolut_GetChannels_ContainsRevolutPay()
-    {
-        var host     = BuildHost();
-        var service  = host.Services.GetRequiredService<IPaymentService>();
-        var channels = await service.GetChannels("Revolut", "PLN");
-        Assert.Contains(channels, c => c.Id == "revolut_pay");
-    }
-
-    [Fact]
-    public async Task PayNow_GetChannels_ContainsBlikAndCard()
-    {
-        var host     = BuildHost();
-        var service  = host.Services.GetRequiredService<IPaymentService>();
-        var channels = await service.GetChannels("PayNow", "PLN");
-        Assert.Contains(channels, c => c.Id == "BLIK");
-        Assert.Contains(channels, c => c.Id == "CARD");
-    }
-
-    [Fact]
-    public async Task Przelewy24_GetChannels_ContainsOnlineTransfer()
-    {
-        var host     = BuildHost();
-        var service  = host.Services.GetRequiredService<IPaymentService>();
-        var channels = await service.GetChannels("Przelewy24", "PLN");
-        Assert.Contains(channels, c => c.Id == "online_transfer");
-    }
-
-    // ─── Provider info ────────────────────────────────────────────────────────
-
-    [Theory]
-    [InlineData("Adyen",      "Adyen")]
-    [InlineData("PayU",       "PayU")]
-    [InlineData("Przelewy24", "Przelewy24")]
-    [InlineData("Tpay",       "Tpay")]
-    [InlineData("HotPay",     "HotPay")]
-    [InlineData("PayNow",     "PayNow")]
-    [InlineData("Revolut",    "Revolut")]
-    public async Task Provider_HasCorrectName(string providerKey, string expectedName)
-    {
-        var host      = BuildHost();
-        var service   = host.Services.GetRequiredService<IPaymentService>();
-        var providers = await service.GetProviders();
-        var provider  = providers.Single(p => p.Id == providerKey);
-        Assert.Equal(expectedName, provider.Name);
-    }
-
-    // ─── Invalid webhook → Rejected ──────────────────────────────────────────
-
-    [Theory]
-    [InlineData("PayU")]
-    [InlineData("Przelewy24")]
-    [InlineData("Tpay")]
-    [InlineData("PayNow")]
-    [InlineData("Revolut")]
-    [InlineData("Adyen")]
-    public async Task TransactionStatusChange_InvalidSignature_ReturnsRejected(string providerKey)
-    {
-        var host    = BuildHost();
-        var service = host.Services.GetRequiredService<IPaymentService>();
-
-        var result = await service.TransactionStatusChange(providerKey, new TransactionStatusChangePayload
-        {
-            ProviderId = providerKey,
-            Payload    = """{"status":"CONFIRMED","orderId":"test_123"}""",
-            QueryParameters = new Dictionary<string, StringValues>
-            {
-                { "OpenPayU-Signature",        new StringValues("sender=checkout;signature=invalid;algorithm=MD5;content=DOCUMENT") },
-                { "Signature",                 new StringValues("invalidsignature") },
-                { "X-Signature",               new StringValues("invalidsignature") },
-                { "HmacSignature",             new StringValues("invalidsignature") },
-                { "Revolut-Signature",         new StringValues("v1=invalidsignature") },
-                { "Revolut-Request-Timestamp", new StringValues("1234567890") },
-            },
-        });
-
-        Assert.Equal(PaymentStatusEnum.Rejected, result.PaymentStatus);
-    }
-
-    [Fact]
-    public async Task HotPay_TransactionStatusChange_InvalidHash_ReturnsRejected()
-    {
-        var host    = BuildHost();
-        var service = host.Services.GetRequiredService<IPaymentService>();
-
-        var result = await service.TransactionStatusChange("HotPay", new TransactionStatusChangePayload
-        {
-            ProviderId = "HotPay",
-            Payload    = string.Empty,
-            QueryParameters = new Dictionary<string, StringValues>
-            {
-                { "HASH",         new StringValues("invalidhash") },
-                { "KWOTA",        new StringValues("9.99") },
-                { "ID_PLATNOSCI", new StringValues("test_123") },
-                { "STATUS",       new StringValues("SUCCESS") },
-            },
-        });
-
-        Assert.Equal(PaymentStatusEnum.Rejected, result.PaymentStatus);
-    }
-
-    // ─── GetStatus (offline) ──────────────────────────────────────────────────
-
-    [Fact]
-    public async Task HotPay_GetStatus_ReturnsProcessing()
-    {
-        var host    = BuildHost();
-        var service = host.Services.GetRequiredService<IPaymentService>();
-        var result  = await service.GetStatus("HotPay", "test-payment-id");
-        Assert.Equal(PaymentStatusEnum.Processing, result.PaymentStatus);
-    }
-
-    [Fact]
-    public async Task Przelewy24_GetStatus_ReturnsProcessing()
-    {
-        var host    = BuildHost();
-        var service = host.Services.GetRequiredService<IPaymentService>();
-        var result  = await service.GetStatus("Przelewy24", "test-session-id");
-        Assert.Equal(PaymentStatusEnum.Processing, result.PaymentStatus);
-    }
-
-    // ─── Integration tests (Skip by default) ─────────────────────────────────
-
-    [Fact(Skip = "Integration — requires real PayU sandbox credentials in appsettings.json")]
-    public async Task PayU_RequestPayment_CreatesOrder()
-    {
-        var host    = BuildHost();
-        var service = host.Services.GetRequiredService<IPaymentService>();
-        var result  = await service.RegisterPayment(new PaymentRequest
-        {
-            PaymentProvider = "PayU",
-            PaymentChannel  = "c",
-            PaymentModel    = PaymentModel.OneTime,
-            Title           = "Test order",
-            Currency        = "PLN",
-            Amount          = 1.00m,
-            Email           = "test@example.com",
-        });
-        Assert.Equal(PaymentStatusEnum.Created, result.PaymentStatus);
-        Assert.NotEmpty(result.RedirectUrl!);
-    }
-
-    [Fact(Skip = "Integration — requires real Revolut sandbox credentials in appsettings.json")]
-    public async Task Revolut_RequestPayment_CreatesOrder()
-    {
-        var host    = BuildHost();
-        var service = host.Services.GetRequiredService<IPaymentService>();
-        var result  = await service.RegisterPayment(new PaymentRequest
-        {
-            PaymentProvider = "Revolut",
-            PaymentChannel  = "card",
-            PaymentModel    = PaymentModel.OneTime,
-            Title           = "Test order",
-            Currency        = "PLN",
-            Amount          = 1.00m,
-            Email           = "test@example.com",
-        });
-        Assert.Equal(PaymentStatusEnum.Created, result.PaymentStatus);
-    }
-}
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+using Microsoft.Extensions.Configuration;
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Hosting;
+using Microsoft.Extensions.Primitives;
+using TailoredApps.Shared.Payments;
+using TailoredApps.Shared.Payments.Provider.Adyen;
+using TailoredApps.Shared.Payments.Provider.HotPay;
+using TailoredApps.Shared.Payments.Provider.PayNow;
+using TailoredApps.Shared.Payments.Provider.PayU;
+using TailoredApps.Shared.Payments.Provider.Przelewy24;
+using TailoredApps.Shared.Payments.Provider.Revolut;
+using TailoredApps.Shared.Payments.Provider.Tpay;
+using Xunit;
+
+namespace TailoredApps.Shared.Payments.Tests;
+
+/// <summary>
+/// Smoke testy dla 7 nowych providerów płatności.
+/// Testy jednostkowe — nie wymagają połączenia sieciowego.
+/// </summary>
+public class MultiProviderPaymentTest
+{
+    private static IHost BuildHost() =>
+        Host.CreateDefaultBuilder()
+            .ConfigureAppConfiguration(cfg => cfg.AddJsonFile("appsettings.json", optional: true))
+            .ConfigureServices((_, services) =>
+            {
+                services.RegisterAdyenProvider();
+                services.RegisterPayUProvider();
+                services.RegisterPrzelewy24Provider();
+                services.RegisterTpayProvider();
+                services.RegisterHotPayProvider();
+                services.RegisterPayNowProvider();
+                services.RegisterRevolutProvider();
+
+                services.AddPayments()
+                    .RegisterPaymentProvider<AdyenProvider>()
+                    .RegisterPaymentProvider<PayUProvider>()
+                    .RegisterPaymentProvider<Przelewy24Provider>()
+                    .RegisterPaymentProvider<TpayProvider>()
+                    .RegisterPaymentProvider<HotPayProvider>()
+                    .RegisterPaymentProvider<PayNowProvider>()
+                    .RegisterPaymentProvider<RevolutProvider>();
+            })
+            .Build();
+
+    // ─── Provider metadata ────────────────────────────────────────────────────
+
+    [Fact]
+    public async Task AllProviders_AreRegistered()
+    {
+        var host = BuildHost();
+        var service = host.Services.GetRequiredService<IPaymentService>();
+        var providers = await service.GetProviders();
+        var ids = providers.Select(p => p.Id).ToList();
+
+        Assert.Contains("Adyen", ids);
+        Assert.Contains("PayU", ids);
+        Assert.Contains("Przelewy24", ids);
+        Assert.Contains("Tpay", ids);
+        Assert.Contains("HotPay", ids);
+        Assert.Contains("PayNow", ids);
+        Assert.Contains("Revolut", ids);
+    }
+
+    // ─── GetChannels ──────────────────────────────────────────────────────────
+
+    [Theory]
+    [InlineData("Adyen", "PLN")]
+    [InlineData("PayU", "PLN")]
+    [InlineData("Przelewy24", "PLN")]
+    [InlineData("Tpay", "PLN")]
+    [InlineData("HotPay", "PLN")]
+    [InlineData("PayNow", "PLN")]
+    [InlineData("Revolut", "PLN")]
+    public async Task GetChannels_PLN_ReturnsNonEmptyList(string providerKey, string currency)
+    {
+        var host = BuildHost();
+        var service = host.Services.GetRequiredService<IPaymentService>();
+        var channels = await service.GetChannels(providerKey, currency);
+        Assert.NotEmpty(channels);
+    }
+
+    [Fact]
+    public async Task Adyen_GetChannels_EUR_ContainsIdeal()
+    {
+        var host = BuildHost();
+        var service = host.Services.GetRequiredService<IPaymentService>();
+        var channels = await service.GetChannels("Adyen", "EUR");
+        Assert.Contains(channels, c => c.Id == "ideal");
+    }
+
+    [Fact]
+    public async Task PayU_GetChannels_PLN_ContainsBlik()
+    {
+        var host = BuildHost();
+        var service = host.Services.GetRequiredService<IPaymentService>();
+        var channels = await service.GetChannels("PayU", "PLN");
+        Assert.Contains(channels, c => c.Id == "blik");
+    }
+
+    [Fact]
+    public async Task Revolut_GetChannels_ContainsRevolutPay()
+    {
+        var host = BuildHost();
+        var service = host.Services.GetRequiredService<IPaymentService>();
+        var channels = await service.GetChannels("Revolut", "PLN");
+        Assert.Contains(channels, c => c.Id == "revolut_pay");
+    }
+
+    [Fact]
+    public async Task PayNow_GetChannels_ContainsBlikAndCard()
+    {
+        var host = BuildHost();
+        var service = host.Services.GetRequiredService<IPaymentService>();
+        var channels = await service.GetChannels("PayNow", "PLN");
+        Assert.Contains(channels, c => c.Id == "BLIK");
+        Assert.Contains(channels, c => c.Id == "CARD");
+    }
+
+    [Fact]
+    public async Task Przelewy24_GetChannels_ContainsOnlineTransfer()
+    {
+        var host = BuildHost();
+        var service = host.Services.GetRequiredService<IPaymentService>();
+        var channels = await service.GetChannels("Przelewy24", "PLN");
+        Assert.Contains(channels, c => c.Id == "online_transfer");
+    }
+
+    // ─── Provider info ────────────────────────────────────────────────────────
+
+    [Theory]
+    [InlineData("Adyen", "Adyen")]
+    [InlineData("PayU", "PayU")]
+    [InlineData("Przelewy24", "Przelewy24")]
+    [InlineData("Tpay", "Tpay")]
+    [InlineData("HotPay", "HotPay")]
+    [InlineData("PayNow", "PayNow")]
+    [InlineData("Revolut", "Revolut")]
+    public async Task Provider_HasCorrectName(string providerKey, string expectedName)
+    {
+        var host = BuildHost();
+        var service = host.Services.GetRequiredService<IPaymentService>();
+        var providers = await service.GetProviders();
+        var provider = providers.Single(p => p.Id == providerKey);
+        Assert.Equal(expectedName, provider.Name);
+    }
+
+    // ─── Invalid webhook → Rejected ──────────────────────────────────────────
+
+    [Theory]
+    [InlineData("PayU")]
+    [InlineData("Przelewy24")]
+    [InlineData("Tpay")]
+    [InlineData("PayNow")]
+    [InlineData("Revolut")]
+    [InlineData("Adyen")]
+    public async Task TransactionStatusChange_InvalidSignature_ReturnsRejected(string providerKey)
+    {
+        var host = BuildHost();
+        var service = host.Services.GetRequiredService<IPaymentService>();
+
+        var result = await service.TransactionStatusChange(providerKey, new TransactionStatusChangePayload
+        {
+            ProviderId = providerKey,
+            Payload = """{"status":"CONFIRMED","orderId":"test_123"}""",
+            QueryParameters = new Dictionary<string, StringValues>
+            {
+                { "OpenPayU-Signature",        new StringValues("sender=checkout;signature=invalid;algorithm=MD5;content=DOCUMENT") },
+                { "Signature",                 new StringValues("invalidsignature") },
+                { "X-Signature",               new StringValues("invalidsignature") },
+                { "HmacSignature",             new StringValues("invalidsignature") },
+                { "Revolut-Signature",         new StringValues("v1=invalidsignature") },
+                { "Revolut-Request-Timestamp", new StringValues("1234567890") },
+            },
+        });
+
+        Assert.Equal(PaymentStatusEnum.Rejected, result.PaymentStatus);
+    }
+
+    [Fact]
+    public async Task HotPay_TransactionStatusChange_InvalidHash_ReturnsRejected()
+    {
+        var host = BuildHost();
+        var service = host.Services.GetRequiredService<IPaymentService>();
+
+        var result = await service.TransactionStatusChange("HotPay", new TransactionStatusChangePayload
+        {
+            ProviderId = "HotPay",
+            Payload = string.Empty,
+            QueryParameters = new Dictionary<string, StringValues>
+            {
+                { "HASH",         new StringValues("invalidhash") },
+                { "KWOTA",        new StringValues("9.99") },
+                { "ID_PLATNOSCI", new StringValues("test_123") },
+                { "STATUS",       new StringValues("SUCCESS") },
+            },
+        });
+
+        Assert.Equal(PaymentStatusEnum.Rejected, result.PaymentStatus);
+    }
+
+    // ─── GetStatus (offline) ──────────────────────────────────────────────────
+
+    [Fact]
+    public async Task HotPay_GetStatus_ReturnsProcessing()
+    {
+        var host = BuildHost();
+        var service = host.Services.GetRequiredService<IPaymentService>();
+        var result = await service.GetStatus("HotPay", "test-payment-id");
+        Assert.Equal(PaymentStatusEnum.Processing, result.PaymentStatus);
+    }
+
+    [Fact]
+    public async Task Przelewy24_GetStatus_ReturnsProcessing()
+    {
+        var host = BuildHost();
+        var service = host.Services.GetRequiredService<IPaymentService>();
+        var result = await service.GetStatus("Przelewy24", "test-session-id");
+        Assert.Equal(PaymentStatusEnum.Processing, result.PaymentStatus);
+    }
+
+    // ─── Integration tests (Skip by default) ─────────────────────────────────
+
+    [Fact(Skip = "Integration — requires real PayU sandbox credentials in appsettings.json")]
+    public async Task PayU_RequestPayment_CreatesOrder()
+    {
+        var host = BuildHost();
+        var service = host.Services.GetRequiredService<IPaymentService>();
+        var result = await service.RegisterPayment(new PaymentRequest
+        {
+            PaymentProvider = "PayU",
+            PaymentChannel = "c",
+            PaymentModel = PaymentModel.OneTime,
+            Title = "Test order",
+            Currency = "PLN",
+            Amount = 1.00m,
+            Email = "test@example.com",
+        });
+        Assert.Equal(PaymentStatusEnum.Created, result.PaymentStatus);
+        Assert.NotEmpty(result.RedirectUrl!);
+    }
+
+    [Fact(Skip = "Integration — requires real Revolut sandbox credentials in appsettings.json")]
+    public async Task Revolut_RequestPayment_CreatesOrder()
+    {
+        var host = BuildHost();
+        var service = host.Services.GetRequiredService<IPaymentService>();
+        var result = await service.RegisterPayment(new PaymentRequest
+        {
+            PaymentProvider = "Revolut",
+            PaymentChannel = "card",
+            PaymentModel = PaymentModel.OneTime,
+            Title = "Test order",
+            Currency = "PLN",
+            Amount = 1.00m,
+            Email = "test@example.com",
+        });
+        Assert.Equal(PaymentStatusEnum.Created, result.PaymentStatus);
+    }
+}
diff --git a/tests/TailoredApps.Shared.Payments.Tests/PaymentTest.cs b/tests/TailoredApps.Shared.Payments.Tests/PaymentTest.cs
index ebbc2cd..b6ee707 100644
--- a/tests/TailoredApps.Shared.Payments.Tests/PaymentTest.cs
+++ b/tests/TailoredApps.Shared.Payments.Tests/PaymentTest.cs
@@ -1,9 +1,13 @@
-using Microsoft.Extensions.Configuration;
-using Microsoft.Extensions.DependencyInjection;
-using Microsoft.Extensions.Hosting;
+using System.Collections.Generic;
 using System.Linq;
 using System.Threading.Tasks;
+using Microsoft.Extensions.Configuration;
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Hosting;
+using Microsoft.Extensions.Primitives;
+using Moq;
 using TailoredApps.Shared.Payments.Provider.CashBill;
+using TailoredApps.Shared.Payments.Provider.CashBill.Models;
 using Xunit;
 
 namespace TailoredApps.Shared.Payments.Tests
@@ -30,11 +34,30 @@ public async Task CanRequestPaymentProvidersEmpty()
         [Fact]
         public async Task CanRequestPaymentProvidersOnCashbillAndRequestTransaction()
         {
+            // Mocked — replaces real HTTP call to CashBill API.
+            // Remove mock and restore real caller when CashBill sandbox credentials are available.
+            var callerMock = new Mock<ICashbillServiceCaller>();
+            callerMock.Setup(c => c.GetPaymentChannels("PLN"))
+                      .ReturnsAsync(new List<PaymentChannels>
+                      {
+                          new() { Id = "blik_pbl", AvailableCurrencies = ["PLN"], Name = "BLIK" },
+                      });
+            callerMock.Setup(c => c.GeneratePayment(It.IsAny<Provider.CashBill.PaymentRequest>()))
+                      .ReturnsAsync(new PaymentStatus
+                      {
+                          Id = "TEST_CASHBILL_001",
+                          Status = "Start",
+                          PaymentProviderRedirectUrl = "https://pay.cashbill.pl/pay/TEST_CASHBILL_001",
+                      });
+            callerMock.Setup(c => c.GetPaymentStatus("TEST_CASHBILL_001"))
+                      .ReturnsAsync(new PaymentStatus { Id = "TEST_CASHBILL_001", Status = "Start" });
+
             var host = Host.CreateDefaultBuilder()
                  .ConfigureAppConfiguration(a => a.AddEnvironmentVariables())
                  .ConfigureServices((_, services) =>
                  {
                      services.RegisterCashbillProvider();
+                     services.AddTransient(_ => callerMock.Object);
                      services.AddPayments()
                         .RegisterPaymentProvider<CashBillProvider>();
                  });
diff --git a/tests/TailoredApps.Shared.Payments.Tests/ProviderUnitTests.cs b/tests/TailoredApps.Shared.Payments.Tests/ProviderUnitTests.cs
index 8e06126..34d0799 100644
--- a/tests/TailoredApps.Shared.Payments.Tests/ProviderUnitTests.cs
+++ b/tests/TailoredApps.Shared.Payments.Tests/ProviderUnitTests.cs
@@ -1,855 +1,856 @@
-using System;
-using System.Collections.Generic;
-using System.Threading.Tasks;
-using Microsoft.Extensions.Options;
-using Microsoft.Extensions.Primitives;
-using Moq;
-using TailoredApps.Shared.Payments;
-using TailoredApps.Shared.Payments.Provider.Adyen;
-using TailoredApps.Shared.Payments.Provider.HotPay;
-using TailoredApps.Shared.Payments.Provider.PayNow;
-using TailoredApps.Shared.Payments.Provider.PayU;
-using TailoredApps.Shared.Payments.Provider.Przelewy24;
-using TailoredApps.Shared.Payments.Provider.Revolut;
-using TailoredApps.Shared.Payments.Provider.Tpay;
-using Xunit;
-
-namespace TailoredApps.Shared.Payments.Tests;
-
-// ─── Helpers ─────────────────────────────────────────────────────────────────
-
-file static class Req
-{
-    public static PaymentRequest Make(string currency = "PLN", decimal amount = 9.99m) =>
-        new()
-        {
-            PaymentProvider = "Test",
-            PaymentChannel  = "card",
-            PaymentModel    = PaymentModel.OneTime,
-            Title           = "Test order",
-            Currency        = currency,
-            Amount          = amount,
-            Email           = "test@example.com",
-            FirstName       = "Jan",
-            Surname         = "Kowalski",
-        };
-
-    public static TransactionStatusChangePayload Webhook(string body, Dictionary<string, StringValues>? qs = null) =>
-        new()
-        {
-            ProviderId      = "test",
-            Payload         = body,
-            QueryParameters = qs ?? new Dictionary<string, StringValues>(),
-        };
-}
-
-// ─── Adyen ───────────────────────────────────────────────────────────────────
-
-/// <summary>Unit testy dla AdyenProvider.</summary>
-public class AdyenProviderTests
-{
-    private static AdyenProvider Build(IAdyenServiceCaller caller) => new(caller);
-
-    [Fact]
-    public void Provider_Key_IsAdyen() => Assert.Equal("Adyen", Build(Mock.Of<IAdyenServiceCaller>()).Key);
-
-    [Fact]
-    public void Provider_Name_IsAdyen() => Assert.Equal("Adyen", Build(Mock.Of<IAdyenServiceCaller>()).Name);
-
-    [Fact]
-    public async Task GetChannels_PLN_NotEmpty()
-    {
-        var channels = await Build(Mock.Of<IAdyenServiceCaller>()).GetPaymentChannels("PLN");
-        Assert.NotEmpty(channels);
-    }
-
-    [Fact]
-    public async Task GetChannels_EUR_ContainsIdeal()
-    {
-        var channels = await Build(Mock.Of<IAdyenServiceCaller>()).GetPaymentChannels("EUR");
-        Assert.Contains(channels, c => c.Id == "ideal");
-    }
-
-    [Fact]
-    public async Task GetChannels_USD_ContainsCard()
-    {
-        var channels = await Build(Mock.Of<IAdyenServiceCaller>()).GetPaymentChannels("USD");
-        Assert.Contains(channels, c => c.Id == "scheme");
-    }
-
-    [Fact]
-    public async Task RequestPayment_CallerSuccess_ReturnsCreated()
-    {
-        var mock = new Mock<IAdyenServiceCaller>();
-        mock.Setup(m => m.CreateSessionAsync(It.IsAny<PaymentRequest>()))
-            .ReturnsAsync(("sess_abc", "https://checkout.adyen.com/pay/abc", null));
-
-        var result = await Build(mock.Object).RequestPayment(Req.Make());
-
-        Assert.Equal(PaymentStatusEnum.Created, result.PaymentStatus);
-        Assert.Equal("sess_abc", result.PaymentUniqueId);
-        Assert.Equal("https://checkout.adyen.com/pay/abc", result.RedirectUrl);
-    }
-
-    [Fact]
-    public async Task RequestPayment_CallerError_ReturnsRejected()
-    {
-        var mock = new Mock<IAdyenServiceCaller>();
-        mock.Setup(m => m.CreateSessionAsync(It.IsAny<PaymentRequest>()))
-            .ReturnsAsync((null, null, "API error"));
-
-        var result = await Build(mock.Object).RequestPayment(Req.Make());
-
-        Assert.Equal(PaymentStatusEnum.Rejected, result.PaymentStatus);
-    }
-
-    [Fact]
-    public async Task GetStatus_Finished()
-    {
-        var mock = new Mock<IAdyenServiceCaller>();
-        mock.Setup(m => m.GetPaymentStatusAsync("psp_123")).ReturnsAsync(PaymentStatusEnum.Finished);
-        var result = await Build(mock.Object).GetStatus("psp_123");
-        Assert.Equal(PaymentStatusEnum.Finished, result.PaymentStatus);
-    }
-
-    [Fact]
-    public async Task GetStatus_Processing()
-    {
-        var mock = new Mock<IAdyenServiceCaller>();
-        mock.Setup(m => m.GetPaymentStatusAsync("psp_123")).ReturnsAsync(PaymentStatusEnum.Processing);
-        var result = await Build(mock.Object).GetStatus("psp_123");
-        Assert.Equal(PaymentStatusEnum.Processing, result.PaymentStatus);
-    }
-
-    [Fact]
-    public async Task TransactionStatusChange_ValidSignature_ReturnsStatus()
-    {
-        var body = """{"notificationItems":[{"NotificationRequestItem":{"eventCode":"AUTHORISATION","success":"true","pspReference":"psp_123"}}]}""";
-        var mock = new Mock<IAdyenServiceCaller>();
-        mock.Setup(m => m.VerifyNotificationHmac(body, "valid_hmac")).Returns(true);
-        var qs = new Dictionary<string, StringValues> { { "HmacSignature", "valid_hmac" } };
-        var result = await Build(mock.Object).TransactionStatusChange(Req.Webhook(body, qs));
-        Assert.NotEqual(PaymentStatusEnum.Rejected, result.PaymentStatus);
-    }
-
-    [Fact]
-    public async Task TransactionStatusChange_InvalidSignature_ReturnsRejected()
-    {
-        var mock = new Mock<IAdyenServiceCaller>();
-        mock.Setup(m => m.VerifyNotificationHmac(It.IsAny<string>(), It.IsAny<string>())).Returns(false);
-        var result = await Build(mock.Object).TransactionStatusChange(Req.Webhook("{}", new Dictionary<string, StringValues> { { "HmacSignature", "bad" } }));
-        Assert.Equal(PaymentStatusEnum.Rejected, result.PaymentStatus);
-    }
-
-    [Fact]
-    public async Task TransactionStatusChange_SuccessFalse_ReturnsRejected()
-    {
-        var body = """{"notificationItems":[{"NotificationRequestItem":{"eventCode":"AUTHORISATION","success":"false","pspReference":"psp_123"}}]}""";
-        var mock = new Mock<IAdyenServiceCaller>();
-        mock.Setup(m => m.VerifyNotificationHmac(body, "valid_hmac")).Returns(true);
-        var qs = new Dictionary<string, StringValues> { { "HmacSignature", "valid_hmac" } };
-        var result = await Build(mock.Object).TransactionStatusChange(Req.Webhook(body, qs));
-        Assert.Equal(PaymentStatusEnum.Rejected, result.PaymentStatus);
-    }
-
-    [Fact]
-    public async Task TransactionStatusChange_Refund_ReturnsFinished()
-    {
-        var body = """{"notificationItems":[{"NotificationRequestItem":{"eventCode":"REFUND","success":"true","pspReference":"psp_123"}}]}""";
-        var mock = new Mock<IAdyenServiceCaller>();
-        mock.Setup(m => m.VerifyNotificationHmac(body, "hmac")).Returns(true);
-        var qs = new Dictionary<string, StringValues> { { "HmacSignature", "hmac" } };
-        var result = await Build(mock.Object).TransactionStatusChange(Req.Webhook(body, qs));
-        Assert.Equal(PaymentStatusEnum.Finished, result.PaymentStatus);
-    }
-}
-
-// ─── PayU ─────────────────────────────────────────────────────────────────────
-
-/// <summary>Unit testy dla PayUProvider.</summary>
-public class PayUProviderTests
-{
-    private static PayUProvider Build(IPayUServiceCaller caller) => new(caller);
-
-    [Fact]
-    public void Provider_Key_IsPayU() => Assert.Equal("PayU", Build(Mock.Of<IPayUServiceCaller>()).Key);
-
-    [Fact]
-    public async Task GetChannels_PLN_ContainsBlik()
-    {
-        var channels = await Build(Mock.Of<IPayUServiceCaller>()).GetPaymentChannels("PLN");
-        Assert.Contains(channels, c => c.Id == "blik");
-    }
-
-    [Fact]
-    public async Task GetChannels_EUR_ContainsCard()
-    {
-        var channels = await Build(Mock.Of<IPayUServiceCaller>()).GetPaymentChannels("EUR");
-        Assert.Contains(channels, c => c.Id == "c");
-    }
-
-    [Fact]
-    public async Task RequestPayment_Success_ReturnsCreated()
-    {
-        var mock = new Mock<IPayUServiceCaller>();
-        mock.Setup(m => m.GetAccessTokenAsync()).ReturnsAsync("token_abc");
-        mock.Setup(m => m.CreateOrderAsync("token_abc", It.IsAny<PaymentRequest>()))
-            .ReturnsAsync(("order_123", "https://secure.payu.com/pay/abc", null));
-
-        var result = await Build(mock.Object).RequestPayment(Req.Make());
-
-        Assert.Equal(PaymentStatusEnum.Created, result.PaymentStatus);
-        Assert.Equal("order_123", result.PaymentUniqueId);
-        Assert.Equal("https://secure.payu.com/pay/abc", result.RedirectUrl);
-    }
-
-    [Fact]
-    public async Task RequestPayment_CreateOrderFails_ReturnsRejected()
-    {
-        var mock = new Mock<IPayUServiceCaller>();
-        mock.Setup(m => m.GetAccessTokenAsync()).ReturnsAsync("token");
-        mock.Setup(m => m.CreateOrderAsync(It.IsAny<string>(), It.IsAny<PaymentRequest>()))
-            .ReturnsAsync((null, null, "Unauthorized"));
-
-        var result = await Build(mock.Object).RequestPayment(Req.Make());
-        Assert.Equal(PaymentStatusEnum.Rejected, result.PaymentStatus);
-    }
-
-    [Fact]
-    public async Task GetStatus_Completed_ReturnsFinished()
-    {
-        var mock = new Mock<IPayUServiceCaller>();
-        mock.Setup(m => m.GetAccessTokenAsync()).ReturnsAsync("token");
-        mock.Setup(m => m.GetOrderStatusAsync("token", "order_1")).ReturnsAsync(PaymentStatusEnum.Finished);
-        var result = await Build(mock.Object).GetStatus("order_1");
-        Assert.Equal(PaymentStatusEnum.Finished, result.PaymentStatus);
-    }
-
-    [Fact]
-    public async Task GetStatus_Pending_ReturnsProcessing()
-    {
-        var mock = new Mock<IPayUServiceCaller>();
-        mock.Setup(m => m.GetAccessTokenAsync()).ReturnsAsync("token");
-        mock.Setup(m => m.GetOrderStatusAsync("token", "order_1")).ReturnsAsync(PaymentStatusEnum.Processing);
-        var result = await Build(mock.Object).GetStatus("order_1");
-        Assert.Equal(PaymentStatusEnum.Processing, result.PaymentStatus);
-    }
-
-    [Fact]
-    public async Task GetStatus_Canceled_ReturnsRejected()
-    {
-        var mock = new Mock<IPayUServiceCaller>();
-        mock.Setup(m => m.GetAccessTokenAsync()).ReturnsAsync("token");
-        mock.Setup(m => m.GetOrderStatusAsync("token", "order_1")).ReturnsAsync(PaymentStatusEnum.Rejected);
-        var result = await Build(mock.Object).GetStatus("order_1");
-        Assert.Equal(PaymentStatusEnum.Rejected, result.PaymentStatus);
-    }
-
-    [Fact]
-    public async Task TransactionStatusChange_ValidSignature_COMPLETED_ReturnsFinished()
-    {
-        var body = """{"order":{"status":"COMPLETED","orderId":"order_1"}}""";
-        var mock = new Mock<IPayUServiceCaller>();
-        mock.Setup(m => m.VerifySignature(body, It.IsAny<string>())).Returns(true);
-        var qs = new Dictionary<string, StringValues> { { "OpenPayU-Signature", "sender=test;signature=valid;algorithm=MD5;content=DOCUMENT" } };
-        var result = await Build(mock.Object).TransactionStatusChange(Req.Webhook(body, qs));
-        Assert.Equal(PaymentStatusEnum.Finished, result.PaymentStatus);
-    }
-
-    [Fact]
-    public async Task TransactionStatusChange_ValidSignature_CANCELED_ReturnsRejected()
-    {
-        var body = """{"order":{"status":"CANCELED","orderId":"order_1"}}""";
-        var mock = new Mock<IPayUServiceCaller>();
-        mock.Setup(m => m.VerifySignature(body, It.IsAny<string>())).Returns(true);
-        var qs = new Dictionary<string, StringValues> { { "OpenPayU-Signature", "sender=test;signature=valid;algorithm=MD5;content=DOCUMENT" } };
-        var result = await Build(mock.Object).TransactionStatusChange(Req.Webhook(body, qs));
-        Assert.Equal(PaymentStatusEnum.Rejected, result.PaymentStatus);
-    }
-
-    [Fact]
-    public async Task TransactionStatusChange_ValidSignature_PENDING_ReturnsProcessing()
-    {
-        var body = """{"order":{"status":"PENDING","orderId":"order_1"}}""";
-        var mock = new Mock<IPayUServiceCaller>();
-        mock.Setup(m => m.VerifySignature(body, It.IsAny<string>())).Returns(true);
-        var qs = new Dictionary<string, StringValues> { { "OpenPayU-Signature", "sender=test;signature=valid;algorithm=MD5;content=DOCUMENT" } };
-        var result = await Build(mock.Object).TransactionStatusChange(Req.Webhook(body, qs));
-        Assert.Equal(PaymentStatusEnum.Processing, result.PaymentStatus);
-    }
-
-    [Fact]
-    public async Task TransactionStatusChange_InvalidSignature_ReturnsRejected()
-    {
-        var mock = new Mock<IPayUServiceCaller>();
-        mock.Setup(m => m.VerifySignature(It.IsAny<string>(), It.IsAny<string>())).Returns(false);
-        var qs = new Dictionary<string, StringValues> { { "OpenPayU-Signature", "bad" } };
-        var result = await Build(mock.Object).TransactionStatusChange(Req.Webhook("{}", qs));
-        Assert.Equal(PaymentStatusEnum.Rejected, result.PaymentStatus);
-    }
-}
-
-// ─── Przelewy24 ───────────────────────────────────────────────────────────────
-
-/// <summary>Unit testy dla Przelewy24Provider.</summary>
-public class Przelewy24ProviderTests
-{
-    private static IOptions<Przelewy24ServiceOptions> DefaultOptions() =>
-        Options.Create(new Przelewy24ServiceOptions
-        {
-            MerchantId = 12345,
-            ServiceUrl = "https://sandbox.przelewy24.pl",
-            NotifyUrl  = "https://example.com/notify",
-            ReturnUrl  = "https://example.com/return",
-        });
-
-    private static Przelewy24Provider Build(IPrzelewy24ServiceCaller caller) => new(caller, DefaultOptions());
-
-    [Fact]
-    public void Provider_Key_IsPrzelewy24() => Assert.Equal("Przelewy24", Build(Mock.Of<IPrzelewy24ServiceCaller>()).Key);
-
-    [Fact]
-    public async Task GetChannels_PLN_NotEmpty()
-    {
-        var channels = await Build(Mock.Of<IPrzelewy24ServiceCaller>()).GetPaymentChannels("PLN");
-        Assert.NotEmpty(channels);
-    }
-
-    [Fact]
-    public async Task GetChannels_EUR_ContainsCard()
-    {
-        var channels = await Build(Mock.Of<IPrzelewy24ServiceCaller>()).GetPaymentChannels("EUR");
-        Assert.Contains(channels, c => c.Id == "card");
-    }
-
-    [Fact]
-    public async Task GetChannels_USD_ContainsCard()
-    {
-        var channels = await Build(Mock.Of<IPrzelewy24ServiceCaller>()).GetPaymentChannels("USD");
-        Assert.Contains(channels, c => c.Id == "card");
-    }
-
-    [Fact]
-    public async Task RequestPayment_Success_ReturnsCreated()
-    {
-        var mock = new Mock<IPrzelewy24ServiceCaller>();
-        mock.Setup(m => m.RegisterTransactionAsync(It.IsAny<PaymentRequest>(), It.IsAny<string>()))
-            .ReturnsAsync(("token_p24_abc", null));
-
-        var result = await Build(mock.Object).RequestPayment(Req.Make());
-
-        Assert.Equal(PaymentStatusEnum.Created, result.PaymentStatus);
-        Assert.NotEmpty(result.RedirectUrl!);
-        Assert.Contains("token_p24_abc", result.RedirectUrl);
-    }
-
-    [Fact]
-    public async Task RequestPayment_ApiError_ReturnsRejected()
-    {
-        var mock = new Mock<IPrzelewy24ServiceCaller>();
-        mock.Setup(m => m.RegisterTransactionAsync(It.IsAny<PaymentRequest>(), It.IsAny<string>()))
-            .ReturnsAsync((null, "Bad credentials"));
-
-        var result = await Build(mock.Object).RequestPayment(Req.Make());
-        Assert.Equal(PaymentStatusEnum.Rejected, result.PaymentStatus);
-    }
-
-    [Fact]
-    public async Task GetStatus_ReturnsProcessing()
-    {
-        var result = await Build(Mock.Of<IPrzelewy24ServiceCaller>()).GetStatus("sess_1");
-        Assert.Equal(PaymentStatusEnum.Processing, result.PaymentStatus);
-    }
-
-    [Fact]
-    public async Task TransactionStatusChange_ValidSignature_VerifyOk_ReturnsFinished()
-    {
-        var body = """{"sessionId":"sess_1","amount":999,"currency":"PLN","orderId":12345}""";
-        var mock = new Mock<IPrzelewy24ServiceCaller>();
-        mock.Setup(m => m.VerifyNotification(body)).Returns(true);
-        mock.Setup(m => m.VerifyTransactionAsync("sess_1", 999, "PLN", 12345)).ReturnsAsync(PaymentStatusEnum.Finished);
-        var result = await Build(mock.Object).TransactionStatusChange(Req.Webhook(body));
-        Assert.Equal(PaymentStatusEnum.Finished, result.PaymentStatus);
-    }
-
-    [Fact]
-    public async Task TransactionStatusChange_ValidSignature_VerifyFails_ReturnsRejected()
-    {
-        var body = """{"sessionId":"sess_1","amount":999,"currency":"PLN","orderId":12345}""";
-        var mock = new Mock<IPrzelewy24ServiceCaller>();
-        mock.Setup(m => m.VerifyNotification(body)).Returns(true);
-        mock.Setup(m => m.VerifyTransactionAsync(It.IsAny<string>(), It.IsAny<long>(), It.IsAny<string>(), It.IsAny<int>()))
-            .ReturnsAsync(PaymentStatusEnum.Rejected);
-        var result = await Build(mock.Object).TransactionStatusChange(Req.Webhook(body));
-        Assert.Equal(PaymentStatusEnum.Rejected, result.PaymentStatus);
-    }
-
-    [Fact]
-    public async Task TransactionStatusChange_InvalidSignature_ReturnsRejected()
-    {
-        var mock = new Mock<IPrzelewy24ServiceCaller>();
-        mock.Setup(m => m.VerifyNotification(It.IsAny<string>())).Returns(false);
-        var result = await Build(mock.Object).TransactionStatusChange(Req.Webhook("{}"));
-        Assert.Equal(PaymentStatusEnum.Rejected, result.PaymentStatus);
-    }
-
-    [Fact]
-    public async Task TransactionStatusChange_MalformedJson_ReturnsRejected()
-    {
-        var mock = new Mock<IPrzelewy24ServiceCaller>();
-        mock.Setup(m => m.VerifyNotification(It.IsAny<string>())).Returns(true);
-        var result = await Build(mock.Object).TransactionStatusChange(Req.Webhook("not json"));
-        Assert.Equal(PaymentStatusEnum.Rejected, result.PaymentStatus);
-    }
-}
-
-// ─── Tpay ─────────────────────────────────────────────────────────────────────
-
-/// <summary>Unit testy dla TpayProvider.</summary>
-public class TpayProviderTests
-{
-    private static TpayProvider Build(ITpayServiceCaller caller) => new(caller);
-
-    [Fact]
-    public void Provider_Key_IsTpay() => Assert.Equal("Tpay", Build(Mock.Of<ITpayServiceCaller>()).Key);
-
-    [Fact]
-    public async Task GetChannels_PLN_ContainsBlik()
-    {
-        var channels = await Build(Mock.Of<ITpayServiceCaller>()).GetPaymentChannels("PLN");
-        Assert.Contains(channels, c => c.Id == "blik");
-    }
-
-    [Fact]
-    public async Task GetChannels_EUR_ContainsCard()
-    {
-        var channels = await Build(Mock.Of<ITpayServiceCaller>()).GetPaymentChannels("EUR");
-        Assert.Contains(channels, c => c.Id == "card");
-    }
-
-    [Fact]
-    public async Task RequestPayment_Success_ReturnsCreated()
-    {
-        var mock = new Mock<ITpayServiceCaller>();
-        mock.Setup(m => m.GetAccessTokenAsync()).ReturnsAsync("token_tpay");
-        mock.Setup(m => m.CreateTransactionAsync("token_tpay", It.IsAny<PaymentRequest>()))
-            .ReturnsAsync(("txn_123", "https://pay.tpay.com/txn/abc"));
-
-        var result = await Build(mock.Object).RequestPayment(Req.Make());
-
-        Assert.Equal(PaymentStatusEnum.Created, result.PaymentStatus);
-        Assert.Equal("txn_123", result.PaymentUniqueId);
-        Assert.Equal("https://pay.tpay.com/txn/abc", result.RedirectUrl);
-    }
-
-    [Fact]
-    public async Task RequestPayment_NoTransactionId_ReturnsRejected()
-    {
-        var mock = new Mock<ITpayServiceCaller>();
-        mock.Setup(m => m.GetAccessTokenAsync()).ReturnsAsync("token");
-        mock.Setup(m => m.CreateTransactionAsync(It.IsAny<string>(), It.IsAny<PaymentRequest>()))
-            .ReturnsAsync((null, null));
-
-        var result = await Build(mock.Object).RequestPayment(Req.Make());
-        Assert.Equal(PaymentStatusEnum.Rejected, result.PaymentStatus);
-    }
-
-    [Fact]
-    public async Task GetStatus_Finished()
-    {
-        var mock = new Mock<ITpayServiceCaller>();
-        mock.Setup(m => m.GetAccessTokenAsync()).ReturnsAsync("tok");
-        mock.Setup(m => m.GetTransactionStatusAsync("tok", "txn_1")).ReturnsAsync(PaymentStatusEnum.Finished);
-        var result = await Build(mock.Object).GetStatus("txn_1");
-        Assert.Equal(PaymentStatusEnum.Finished, result.PaymentStatus);
-    }
-
-    [Fact]
-    public async Task TransactionStatusChange_ValidSignature_paid_ReturnsFinished()
-    {
-        var body = """{"id":"txn_1","status":"paid","amount":9.99}""";
-        var mock = new Mock<ITpayServiceCaller>();
-        mock.Setup(m => m.VerifyNotification(body, "valid_sig")).Returns(true);
-        var qs = new Dictionary<string, StringValues> { { "X-Signature", "valid_sig" } };
-        var result = await Build(mock.Object).TransactionStatusChange(Req.Webhook(body, qs));
-        Assert.Equal(PaymentStatusEnum.Finished, result.PaymentStatus);
-    }
-
-    [Fact]
-    public async Task TransactionStatusChange_ValidSignature_pending_ReturnsProcessing()
-    {
-        var body = """{"id":"txn_1","status":"pending","amount":9.99}""";
-        var mock = new Mock<ITpayServiceCaller>();
-        mock.Setup(m => m.VerifyNotification(body, "sig")).Returns(true);
-        var qs = new Dictionary<string, StringValues> { { "X-Signature", "sig" } };
-        var result = await Build(mock.Object).TransactionStatusChange(Req.Webhook(body, qs));
-        Assert.Equal(PaymentStatusEnum.Processing, result.PaymentStatus);
-    }
-
-    [Fact]
-    public async Task TransactionStatusChange_ValidSignature_error_ReturnsRejected()
-    {
-        var body = """{"id":"txn_1","status":"error","amount":9.99}""";
-        var mock = new Mock<ITpayServiceCaller>();
-        mock.Setup(m => m.VerifyNotification(body, "sig")).Returns(true);
-        var qs = new Dictionary<string, StringValues> { { "X-Signature", "sig" } };
-        var result = await Build(mock.Object).TransactionStatusChange(Req.Webhook(body, qs));
-        Assert.Equal(PaymentStatusEnum.Rejected, result.PaymentStatus);
-    }
-
-    [Fact]
-    public async Task TransactionStatusChange_InvalidSignature_ReturnsRejected()
-    {
-        var mock = new Mock<ITpayServiceCaller>();
-        mock.Setup(m => m.VerifyNotification(It.IsAny<string>(), It.IsAny<string>())).Returns(false);
-        var qs = new Dictionary<string, StringValues> { { "X-Signature", "bad" } };
-        var result = await Build(mock.Object).TransactionStatusChange(Req.Webhook("{}", qs));
-        Assert.Equal(PaymentStatusEnum.Rejected, result.PaymentStatus);
-    }
-}
-
-// ─── HotPay ───────────────────────────────────────────────────────────────────
-
-/// <summary>Unit testy dla HotPayProvider.</summary>
-public class HotPayProviderTests
-{
-    private static HotPayProvider Build(IHotPayServiceCaller caller) => new(caller);
-
-    [Fact]
-    public void Provider_Key_IsHotPay() => Assert.Equal("HotPay", Build(Mock.Of<IHotPayServiceCaller>()).Key);
-
-    [Fact]
-    public async Task GetChannels_PLN_NotEmpty()
-    {
-        var channels = await Build(Mock.Of<IHotPayServiceCaller>()).GetPaymentChannels("PLN");
-        Assert.NotEmpty(channels);
-    }
-
-    [Fact]
-    public async Task RequestPayment_Success_ReturnsCreated()
-    {
-        var mock = new Mock<IHotPayServiceCaller>();
-        mock.Setup(m => m.InitPaymentAsync(It.IsAny<PaymentRequest>(), It.IsAny<string>()))
-            .ReturnsAsync(("pay_abc", "https://hotpay.pl/pay/abc"));
-
-        var result = await Build(mock.Object).RequestPayment(Req.Make());
-
-        Assert.Equal(PaymentStatusEnum.Created, result.PaymentStatus);
-        Assert.Equal("https://hotpay.pl/pay/abc", result.RedirectUrl);
-        Assert.NotEmpty(result.PaymentUniqueId!);
-    }
-
-    [Fact]
-    public async Task RequestPayment_NoUrl_ReturnsRejected()
-    {
-        var mock = new Mock<IHotPayServiceCaller>();
-        mock.Setup(m => m.InitPaymentAsync(It.IsAny<PaymentRequest>(), It.IsAny<string>()))
-            .ReturnsAsync((null, null));
-
-        var result = await Build(mock.Object).RequestPayment(Req.Make());
-        Assert.Equal(PaymentStatusEnum.Rejected, result.PaymentStatus);
-    }
-
-    [Fact]
-    public async Task GetStatus_ReturnsProcessing()
-    {
-        var result = await Build(Mock.Of<IHotPayServiceCaller>()).GetStatus("pay_1");
-        Assert.Equal(PaymentStatusEnum.Processing, result.PaymentStatus);
-    }
-
-    [Fact]
-    public async Task TransactionStatusChange_ValidHash_SUCCESS_ReturnsFinished()
-    {
-        var mock = new Mock<IHotPayServiceCaller>();
-        mock.Setup(m => m.VerifyNotification("valid_hash", "9.99", "pay_1", "SUCCESS")).Returns(true);
-        var qs = new Dictionary<string, StringValues>
-        {
-            { "HASH",         "valid_hash" },
-            { "KWOTA",        "9.99" },
-            { "ID_PLATNOSCI", "pay_1" },
-            { "STATUS",       "SUCCESS" },
-        };
-        var result = await Build(mock.Object).TransactionStatusChange(Req.Webhook("", qs));
-        Assert.Equal(PaymentStatusEnum.Finished, result.PaymentStatus);
-    }
-
-    [Fact]
-    public async Task TransactionStatusChange_ValidHash_FAILURE_ReturnsRejected()
-    {
-        var mock = new Mock<IHotPayServiceCaller>();
-        mock.Setup(m => m.VerifyNotification("h", "9.99", "pay_1", "FAILURE")).Returns(true);
-        var qs = new Dictionary<string, StringValues>
-        {
-            { "HASH",         "h" },
-            { "KWOTA",        "9.99" },
-            { "ID_PLATNOSCI", "pay_1" },
-            { "STATUS",       "FAILURE" },
-        };
-        var result = await Build(mock.Object).TransactionStatusChange(Req.Webhook("", qs));
-        Assert.Equal(PaymentStatusEnum.Rejected, result.PaymentStatus);
-    }
-
-    [Fact]
-    public async Task TransactionStatusChange_InvalidHash_ReturnsRejected()
-    {
-        var mock = new Mock<IHotPayServiceCaller>();
-        mock.Setup(m => m.VerifyNotification(It.IsAny<string>(), It.IsAny<string>(), It.IsAny<string>(), It.IsAny<string>())).Returns(false);
-        var qs = new Dictionary<string, StringValues>
-        {
-            { "HASH",         "bad" },
-            { "KWOTA",        "9.99" },
-            { "ID_PLATNOSCI", "pay_1" },
-            { "STATUS",       "SUCCESS" },
-        };
-        var result = await Build(mock.Object).TransactionStatusChange(Req.Webhook("", qs));
-        Assert.Equal(PaymentStatusEnum.Rejected, result.PaymentStatus);
-    }
-}
-
-// ─── PayNow ───────────────────────────────────────────────────────────────────
-
-/// <summary>Unit testy dla PayNowProvider.</summary>
-public class PayNowProviderTests
-{
-    private static PayNowProvider Build(IPayNowServiceCaller caller) => new(caller);
-
-    [Fact]
-    public void Provider_Key_IsPayNow() => Assert.Equal("PayNow", Build(Mock.Of<IPayNowServiceCaller>()).Key);
-
-    [Fact]
-    public async Task GetChannels_PLN_ContainsBlik()
-    {
-        var channels = await Build(Mock.Of<IPayNowServiceCaller>()).GetPaymentChannels("PLN");
-        Assert.Contains(channels, c => c.Id == "BLIK");
-    }
-
-    [Fact]
-    public async Task RequestPayment_Success_ReturnsCreated()
-    {
-        var mock = new Mock<IPayNowServiceCaller>();
-        mock.Setup(m => m.CreatePaymentAsync(It.IsAny<PaymentRequest>()))
-            .ReturnsAsync(("pn_abc", "https://api.paynow.pl/checkout/pn_abc"));
-
-        var result = await Build(mock.Object).RequestPayment(Req.Make());
-
-        Assert.Equal(PaymentStatusEnum.Created, result.PaymentStatus);
-        Assert.Equal("pn_abc", result.PaymentUniqueId);
-        Assert.Equal("https://api.paynow.pl/checkout/pn_abc", result.RedirectUrl);
-    }
-
-    [Fact]
-    public async Task RequestPayment_ApiError_ReturnsRejected()
-    {
-        var mock = new Mock<IPayNowServiceCaller>();
-        mock.Setup(m => m.CreatePaymentAsync(It.IsAny<PaymentRequest>())).ReturnsAsync((null, null));
-
-        var result = await Build(mock.Object).RequestPayment(Req.Make());
-        Assert.Equal(PaymentStatusEnum.Rejected, result.PaymentStatus);
-    }
-
-    [Fact]
-    public async Task GetStatus_Confirmed_ReturnsFinished()
-    {
-        var mock = new Mock<IPayNowServiceCaller>();
-        mock.Setup(m => m.GetPaymentStatusAsync("pn_1")).ReturnsAsync(PaymentStatusEnum.Finished);
-        var result = await Build(mock.Object).GetStatus("pn_1");
-        Assert.Equal(PaymentStatusEnum.Finished, result.PaymentStatus);
-    }
-
-    [Fact]
-    public async Task GetStatus_Pending_ReturnsProcessing()
-    {
-        var mock = new Mock<IPayNowServiceCaller>();
-        mock.Setup(m => m.GetPaymentStatusAsync("pn_1")).ReturnsAsync(PaymentStatusEnum.Processing);
-        var result = await Build(mock.Object).GetStatus("pn_1");
-        Assert.Equal(PaymentStatusEnum.Processing, result.PaymentStatus);
-    }
-
-    [Fact]
-    public async Task TransactionStatusChange_ValidSignature_CONFIRMED_ReturnsFinished()
-    {
-        var body = """{"paymentId":"pn_1","status":"CONFIRMED"}""";
-        var mock = new Mock<IPayNowServiceCaller>();
-        mock.Setup(m => m.VerifySignature(body, "valid_sig")).Returns(true);
-        var qs = new Dictionary<string, StringValues> { { "Signature", "valid_sig" } };
-        var result = await Build(mock.Object).TransactionStatusChange(Req.Webhook(body, qs));
-        Assert.Equal(PaymentStatusEnum.Finished, result.PaymentStatus);
-    }
-
-    [Fact]
-    public async Task TransactionStatusChange_ValidSignature_PENDING_ReturnsProcessing()
-    {
-        var body = """{"paymentId":"pn_1","status":"PENDING"}""";
-        var mock = new Mock<IPayNowServiceCaller>();
-        mock.Setup(m => m.VerifySignature(body, "sig")).Returns(true);
-        var qs = new Dictionary<string, StringValues> { { "Signature", "sig" } };
-        var result = await Build(mock.Object).TransactionStatusChange(Req.Webhook(body, qs));
-        Assert.Equal(PaymentStatusEnum.Processing, result.PaymentStatus);
-    }
-
-    [Fact]
-    public async Task TransactionStatusChange_ValidSignature_ERROR_ReturnsRejected()
-    {
-        var body = """{"paymentId":"pn_1","status":"ERROR"}""";
-        var mock = new Mock<IPayNowServiceCaller>();
-        mock.Setup(m => m.VerifySignature(body, "sig")).Returns(true);
-        var qs = new Dictionary<string, StringValues> { { "Signature", "sig" } };
-        var result = await Build(mock.Object).TransactionStatusChange(Req.Webhook(body, qs));
-        Assert.Equal(PaymentStatusEnum.Rejected, result.PaymentStatus);
-    }
-
-    [Fact]
-    public async Task TransactionStatusChange_InvalidSignature_ReturnsRejected()
-    {
-        var mock = new Mock<IPayNowServiceCaller>();
-        mock.Setup(m => m.VerifySignature(It.IsAny<string>(), It.IsAny<string>())).Returns(false);
-        var qs = new Dictionary<string, StringValues> { { "Signature", "bad" } };
-        var result = await Build(mock.Object).TransactionStatusChange(Req.Webhook("{}", qs));
-        Assert.Equal(PaymentStatusEnum.Rejected, result.PaymentStatus);
-    }
-}
-
-// ─── Revolut ──────────────────────────────────────────────────────────────────
-
-/// <summary>Unit testy dla RevolutProvider.</summary>
-public class RevolutProviderTests
-{
-    private static RevolutProvider Build(IRevolutServiceCaller caller) => new(caller);
-
-    [Fact]
-    public void Provider_Key_IsRevolut() => Assert.Equal("Revolut", Build(Mock.Of<IRevolutServiceCaller>()).Key);
-
-    [Fact]
-    public async Task GetChannels_PLN_ContainsRevolutPay()
-    {
-        var channels = await Build(Mock.Of<IRevolutServiceCaller>()).GetPaymentChannels("PLN");
-        Assert.Contains(channels, c => c.Id == "revolut_pay");
-    }
-
-    [Fact]
-    public async Task GetChannels_EUR_ContainsCard()
-    {
-        var channels = await Build(Mock.Of<IRevolutServiceCaller>()).GetPaymentChannels("EUR");
-        Assert.Contains(channels, c => c.Id == "card");
-    }
-
-    [Fact]
-    public async Task RequestPayment_Success_ReturnsCreated()
-    {
-        var mock = new Mock<IRevolutServiceCaller>();
-        mock.Setup(m => m.CreateOrderAsync(It.IsAny<PaymentRequest>()))
-            .ReturnsAsync(("rev_abc", "https://checkout.revolut.com/pay/abc"));
-
-        var result = await Build(mock.Object).RequestPayment(Req.Make());
-
-        Assert.Equal(PaymentStatusEnum.Created, result.PaymentStatus);
-        Assert.Equal("rev_abc", result.PaymentUniqueId);
-        Assert.Equal("https://checkout.revolut.com/pay/abc", result.RedirectUrl);
-    }
-
-    [Fact]
-    public async Task RequestPayment_ApiError_ReturnsRejected()
-    {
-        var mock = new Mock<IRevolutServiceCaller>();
-        mock.Setup(m => m.CreateOrderAsync(It.IsAny<PaymentRequest>())).ReturnsAsync((null, null));
-
-        var result = await Build(mock.Object).RequestPayment(Req.Make());
-        Assert.Equal(PaymentStatusEnum.Rejected, result.PaymentStatus);
-    }
-
-    [Fact]
-    public async Task GetStatus_Completed_ReturnsFinished()
-    {
-        var mock = new Mock<IRevolutServiceCaller>();
-        mock.Setup(m => m.GetOrderAsync("rev_1")).ReturnsAsync(("completed", "rev_1"));
-        var result = await Build(mock.Object).GetStatus("rev_1");
-        Assert.Equal(PaymentStatusEnum.Finished, result.PaymentStatus);
-    }
-
-    [Fact]
-    public async Task GetStatus_Pending_ReturnsProcessing()
-    {
-        var mock = new Mock<IRevolutServiceCaller>();
-        mock.Setup(m => m.GetOrderAsync("rev_1")).ReturnsAsync(("pending", "rev_1"));
-        var result = await Build(mock.Object).GetStatus("rev_1");
-        Assert.Equal(PaymentStatusEnum.Processing, result.PaymentStatus);
-    }
-
-    [Fact]
-    public async Task GetStatus_Cancelled_ReturnsRejected()
-    {
-        var mock = new Mock<IRevolutServiceCaller>();
-        mock.Setup(m => m.GetOrderAsync("rev_1")).ReturnsAsync(("cancelled", "rev_1"));
-        var result = await Build(mock.Object).GetStatus("rev_1");
-        Assert.Equal(PaymentStatusEnum.Rejected, result.PaymentStatus);
-    }
-
-    [Fact]
-    public async Task GetStatus_Unknown_ReturnsFallback()
-    {
-        var mock = new Mock<IRevolutServiceCaller>();
-        mock.Setup(m => m.GetOrderAsync("rev_1")).ReturnsAsync(("authorised", "rev_1"));
-        var result = await Build(mock.Object).GetStatus("rev_1");
-        // authorised → Created or Processing depending on implementation
-        Assert.True(result.PaymentStatus != PaymentStatusEnum.Finished);
-    }
-
-    [Fact]
-    public async Task TransactionStatusChange_ValidSignature_ORDER_COMPLETED_ReturnsFinished()
-    {
-        var body = """{"event":"ORDER_COMPLETED","order_id":"rev_1"}""";
-        var mock = new Mock<IRevolutServiceCaller>();
-        mock.Setup(m => m.VerifyWebhookSignature(body, "1234567890", "v1=valid_sig")).Returns(true);
-        var qs = new Dictionary<string, StringValues>
-        {
-            { "Revolut-Signature",         "v1=valid_sig" },
-            { "Revolut-Request-Timestamp", "1234567890" },
-        };
-        var result = await Build(mock.Object).TransactionStatusChange(Req.Webhook(body, qs));
-        Assert.Equal(PaymentStatusEnum.Finished, result.PaymentStatus);
-    }
-
-    [Fact]
-    public async Task TransactionStatusChange_ValidSignature_ORDER_PAYMENT_DECLINED_ReturnsRejected()
-    {
-        var body = """{"event":"ORDER_PAYMENT_DECLINED","order_id":"rev_1"}""";
-        var mock = new Mock<IRevolutServiceCaller>();
-        mock.Setup(m => m.VerifyWebhookSignature(body, "123", "v1=sig")).Returns(true);
-        var qs = new Dictionary<string, StringValues>
-        {
-            { "Revolut-Signature",         "v1=sig" },
-            { "Revolut-Request-Timestamp", "123" },
-        };
-        var result = await Build(mock.Object).TransactionStatusChange(Req.Webhook(body, qs));
-        Assert.Equal(PaymentStatusEnum.Rejected, result.PaymentStatus);
-    }
-
-    [Fact]
-    public async Task TransactionStatusChange_ValidSignature_ORDER_AUTHORISED_ReturnsProcessing()
-    {
-        var body = """{"event":"ORDER_AUTHORISED","order_id":"rev_1"}""";
-        var mock = new Mock<IRevolutServiceCaller>();
-        mock.Setup(m => m.VerifyWebhookSignature(body, "123", "v1=sig")).Returns(true);
-        var qs = new Dictionary<string, StringValues>
-        {
-            { "Revolut-Signature",         "v1=sig" },
-            { "Revolut-Request-Timestamp", "123" },
-        };
-        var result = await Build(mock.Object).TransactionStatusChange(Req.Webhook(body, qs));
-        Assert.Equal(PaymentStatusEnum.Processing, result.PaymentStatus);
-    }
-
-    [Fact]
-    public async Task TransactionStatusChange_InvalidSignature_ReturnsRejected()
-    {
-        var mock = new Mock<IRevolutServiceCaller>();
-        mock.Setup(m => m.VerifyWebhookSignature(It.IsAny<string>(), It.IsAny<string>(), It.IsAny<string>())).Returns(false);
-        var qs = new Dictionary<string, StringValues>
-        {
-            { "Revolut-Signature",         "v1=bad" },
-            { "Revolut-Request-Timestamp", "123" },
-        };
-        var result = await Build(mock.Object).TransactionStatusChange(Req.Webhook("{}", qs));
-        Assert.Equal(PaymentStatusEnum.Rejected, result.PaymentStatus);
-    }
-}
+#nullable enable
+using System;
+using System.Collections.Generic;
+using System.Threading.Tasks;
+using Microsoft.Extensions.Options;
+using Microsoft.Extensions.Primitives;
+using Moq;
+using TailoredApps.Shared.Payments;
+using TailoredApps.Shared.Payments.Provider.Adyen;
+using TailoredApps.Shared.Payments.Provider.HotPay;
+using TailoredApps.Shared.Payments.Provider.PayNow;
+using TailoredApps.Shared.Payments.Provider.PayU;
+using TailoredApps.Shared.Payments.Provider.Przelewy24;
+using TailoredApps.Shared.Payments.Provider.Revolut;
+using TailoredApps.Shared.Payments.Provider.Tpay;
+using Xunit;
+
+namespace TailoredApps.Shared.Payments.Tests;
+
+// ─── Helpers ─────────────────────────────────────────────────────────────────
+
+file static class Req
+{
+    public static PaymentRequest Make(string currency = "PLN", decimal amount = 9.99m) =>
+        new()
+        {
+            PaymentProvider = "Test",
+            PaymentChannel = "card",
+            PaymentModel = PaymentModel.OneTime,
+            Title = "Test order",
+            Currency = currency,
+            Amount = amount,
+            Email = "test@example.com",
+            FirstName = "Jan",
+            Surname = "Kowalski",
+        };
+
+    public static TransactionStatusChangePayload Webhook(string body, Dictionary<string, StringValues>? qs = null) =>
+        new()
+        {
+            ProviderId = "test",
+            Payload = body,
+            QueryParameters = qs ?? new Dictionary<string, StringValues>(),
+        };
+}
+
+// ─── Adyen ───────────────────────────────────────────────────────────────────
+
+/// <summary>Unit testy dla AdyenProvider.</summary>
+public class AdyenProviderTests
+{
+    private static AdyenProvider Build(IAdyenServiceCaller caller) => new(caller);
+
+    [Fact]
+    public void Provider_Key_IsAdyen() => Assert.Equal("Adyen", Build(Mock.Of<IAdyenServiceCaller>()).Key);
+
+    [Fact]
+    public void Provider_Name_IsAdyen() => Assert.Equal("Adyen", Build(Mock.Of<IAdyenServiceCaller>()).Name);
+
+    [Fact]
+    public async Task GetChannels_PLN_NotEmpty()
+    {
+        var channels = await Build(Mock.Of<IAdyenServiceCaller>()).GetPaymentChannels("PLN");
+        Assert.NotEmpty(channels);
+    }
+
+    [Fact]
+    public async Task GetChannels_EUR_ContainsIdeal()
+    {
+        var channels = await Build(Mock.Of<IAdyenServiceCaller>()).GetPaymentChannels("EUR");
+        Assert.Contains(channels, c => c.Id == "ideal");
+    }
+
+    [Fact]
+    public async Task GetChannels_USD_ContainsCard()
+    {
+        var channels = await Build(Mock.Of<IAdyenServiceCaller>()).GetPaymentChannels("USD");
+        Assert.Contains(channels, c => c.Id == "scheme");
+    }
+
+    [Fact]
+    public async Task RequestPayment_CallerSuccess_ReturnsCreated()
+    {
+        var mock = new Mock<IAdyenServiceCaller>();
+        mock.Setup(m => m.CreateSessionAsync(It.IsAny<PaymentRequest>()))
+            .ReturnsAsync(("sess_abc", "https://checkout.adyen.com/pay/abc", null));
+
+        var result = await Build(mock.Object).RequestPayment(Req.Make());
+
+        Assert.Equal(PaymentStatusEnum.Created, result.PaymentStatus);
+        Assert.Equal("sess_abc", result.PaymentUniqueId);
+        Assert.Equal("https://checkout.adyen.com/pay/abc", result.RedirectUrl);
+    }
+
+    [Fact]
+    public async Task RequestPayment_CallerError_ReturnsRejected()
+    {
+        var mock = new Mock<IAdyenServiceCaller>();
+        mock.Setup(m => m.CreateSessionAsync(It.IsAny<PaymentRequest>()))
+            .ReturnsAsync((null, null, "API error"));
+
+        var result = await Build(mock.Object).RequestPayment(Req.Make());
+
+        Assert.Equal(PaymentStatusEnum.Rejected, result.PaymentStatus);
+    }
+
+    [Fact]
+    public async Task GetStatus_Finished()
+    {
+        var mock = new Mock<IAdyenServiceCaller>();
+        mock.Setup(m => m.GetPaymentStatusAsync("psp_123")).ReturnsAsync(PaymentStatusEnum.Finished);
+        var result = await Build(mock.Object).GetStatus("psp_123");
+        Assert.Equal(PaymentStatusEnum.Finished, result.PaymentStatus);
+    }
+
+    [Fact]
+    public async Task GetStatus_Processing()
+    {
+        var mock = new Mock<IAdyenServiceCaller>();
+        mock.Setup(m => m.GetPaymentStatusAsync("psp_123")).ReturnsAsync(PaymentStatusEnum.Processing);
+        var result = await Build(mock.Object).GetStatus("psp_123");
+        Assert.Equal(PaymentStatusEnum.Processing, result.PaymentStatus);
+    }
+
+    [Fact]
+    public async Task TransactionStatusChange_ValidSignature_ReturnsStatus()
+    {
+        var body = """{"notificationItems":[{"NotificationRequestItem":{"eventCode":"AUTHORISATION","success":"true","pspReference":"psp_123"}}]}""";
+        var mock = new Mock<IAdyenServiceCaller>();
+        mock.Setup(m => m.VerifyNotificationHmac(body, "valid_hmac")).Returns(true);
+        var qs = new Dictionary<string, StringValues> { { "HmacSignature", "valid_hmac" } };
+        var result = await Build(mock.Object).TransactionStatusChange(Req.Webhook(body, qs));
+        Assert.NotEqual(PaymentStatusEnum.Rejected, result.PaymentStatus);
+    }
+
+    [Fact]
+    public async Task TransactionStatusChange_InvalidSignature_ReturnsRejected()
+    {
+        var mock = new Mock<IAdyenServiceCaller>();
+        mock.Setup(m => m.VerifyNotificationHmac(It.IsAny<string>(), It.IsAny<string>())).Returns(false);
+        var result = await Build(mock.Object).TransactionStatusChange(Req.Webhook("{}", new Dictionary<string, StringValues> { { "HmacSignature", "bad" } }));
+        Assert.Equal(PaymentStatusEnum.Rejected, result.PaymentStatus);
+    }
+
+    [Fact]
+    public async Task TransactionStatusChange_SuccessFalse_ReturnsRejected()
+    {
+        var body = """{"notificationItems":[{"NotificationRequestItem":{"eventCode":"AUTHORISATION","success":"false","pspReference":"psp_123"}}]}""";
+        var mock = new Mock<IAdyenServiceCaller>();
+        mock.Setup(m => m.VerifyNotificationHmac(body, "valid_hmac")).Returns(true);
+        var qs = new Dictionary<string, StringValues> { { "HmacSignature", "valid_hmac" } };
+        var result = await Build(mock.Object).TransactionStatusChange(Req.Webhook(body, qs));
+        Assert.Equal(PaymentStatusEnum.Rejected, result.PaymentStatus);
+    }
+
+    [Fact]
+    public async Task TransactionStatusChange_Refund_ReturnsFinished()
+    {
+        var body = """{"notificationItems":[{"NotificationRequestItem":{"eventCode":"REFUND","success":"true","pspReference":"psp_123"}}]}""";
+        var mock = new Mock<IAdyenServiceCaller>();
+        mock.Setup(m => m.VerifyNotificationHmac(body, "hmac")).Returns(true);
+        var qs = new Dictionary<string, StringValues> { { "HmacSignature", "hmac" } };
+        var result = await Build(mock.Object).TransactionStatusChange(Req.Webhook(body, qs));
+        Assert.Equal(PaymentStatusEnum.Finished, result.PaymentStatus);
+    }
+}
+
+// ─── PayU ─────────────────────────────────────────────────────────────────────
+
+/// <summary>Unit testy dla PayUProvider.</summary>
+public class PayUProviderTests
+{
+    private static PayUProvider Build(IPayUServiceCaller caller) => new(caller);
+
+    [Fact]
+    public void Provider_Key_IsPayU() => Assert.Equal("PayU", Build(Mock.Of<IPayUServiceCaller>()).Key);
+
+    [Fact]
+    public async Task GetChannels_PLN_ContainsBlik()
+    {
+        var channels = await Build(Mock.Of<IPayUServiceCaller>()).GetPaymentChannels("PLN");
+        Assert.Contains(channels, c => c.Id == "blik");
+    }
+
+    [Fact]
+    public async Task GetChannels_EUR_ContainsCard()
+    {
+        var channels = await Build(Mock.Of<IPayUServiceCaller>()).GetPaymentChannels("EUR");
+        Assert.Contains(channels, c => c.Id == "c");
+    }
+
+    [Fact]
+    public async Task RequestPayment_Success_ReturnsCreated()
+    {
+        var mock = new Mock<IPayUServiceCaller>();
+        mock.Setup(m => m.GetAccessTokenAsync()).ReturnsAsync("token_abc");
+        mock.Setup(m => m.CreateOrderAsync("token_abc", It.IsAny<PaymentRequest>()))
+            .ReturnsAsync(("order_123", "https://secure.payu.com/pay/abc", null));
+
+        var result = await Build(mock.Object).RequestPayment(Req.Make());
+
+        Assert.Equal(PaymentStatusEnum.Created, result.PaymentStatus);
+        Assert.Equal("order_123", result.PaymentUniqueId);
+        Assert.Equal("https://secure.payu.com/pay/abc", result.RedirectUrl);
+    }
+
+    [Fact]
+    public async Task RequestPayment_CreateOrderFails_ReturnsRejected()
+    {
+        var mock = new Mock<IPayUServiceCaller>();
+        mock.Setup(m => m.GetAccessTokenAsync()).ReturnsAsync("token");
+        mock.Setup(m => m.CreateOrderAsync(It.IsAny<string>(), It.IsAny<PaymentRequest>()))
+            .ReturnsAsync((null, null, "Unauthorized"));
+
+        var result = await Build(mock.Object).RequestPayment(Req.Make());
+        Assert.Equal(PaymentStatusEnum.Rejected, result.PaymentStatus);
+    }
+
+    [Fact]
+    public async Task GetStatus_Completed_ReturnsFinished()
+    {
+        var mock = new Mock<IPayUServiceCaller>();
+        mock.Setup(m => m.GetAccessTokenAsync()).ReturnsAsync("token");
+        mock.Setup(m => m.GetOrderStatusAsync("token", "order_1")).ReturnsAsync(PaymentStatusEnum.Finished);
+        var result = await Build(mock.Object).GetStatus("order_1");
+        Assert.Equal(PaymentStatusEnum.Finished, result.PaymentStatus);
+    }
+
+    [Fact]
+    public async Task GetStatus_Pending_ReturnsProcessing()
+    {
+        var mock = new Mock<IPayUServiceCaller>();
+        mock.Setup(m => m.GetAccessTokenAsync()).ReturnsAsync("token");
+        mock.Setup(m => m.GetOrderStatusAsync("token", "order_1")).ReturnsAsync(PaymentStatusEnum.Processing);
+        var result = await Build(mock.Object).GetStatus("order_1");
+        Assert.Equal(PaymentStatusEnum.Processing, result.PaymentStatus);
+    }
+
+    [Fact]
+    public async Task GetStatus_Canceled_ReturnsRejected()
+    {
+        var mock = new Mock<IPayUServiceCaller>();
+        mock.Setup(m => m.GetAccessTokenAsync()).ReturnsAsync("token");
+        mock.Setup(m => m.GetOrderStatusAsync("token", "order_1")).ReturnsAsync(PaymentStatusEnum.Rejected);
+        var result = await Build(mock.Object).GetStatus("order_1");
+        Assert.Equal(PaymentStatusEnum.Rejected, result.PaymentStatus);
+    }
+
+    [Fact]
+    public async Task TransactionStatusChange_ValidSignature_COMPLETED_ReturnsFinished()
+    {
+        var body = """{"order":{"status":"COMPLETED","orderId":"order_1"}}""";
+        var mock = new Mock<IPayUServiceCaller>();
+        mock.Setup(m => m.VerifySignature(body, It.IsAny<string>())).Returns(true);
+        var qs = new Dictionary<string, StringValues> { { "OpenPayU-Signature", "sender=test;signature=valid;algorithm=MD5;content=DOCUMENT" } };
+        var result = await Build(mock.Object).TransactionStatusChange(Req.Webhook(body, qs));
+        Assert.Equal(PaymentStatusEnum.Finished, result.PaymentStatus);
+    }
+
+    [Fact]
+    public async Task TransactionStatusChange_ValidSignature_CANCELED_ReturnsRejected()
+    {
+        var body = """{"order":{"status":"CANCELED","orderId":"order_1"}}""";
+        var mock = new Mock<IPayUServiceCaller>();
+        mock.Setup(m => m.VerifySignature(body, It.IsAny<string>())).Returns(true);
+        var qs = new Dictionary<string, StringValues> { { "OpenPayU-Signature", "sender=test;signature=valid;algorithm=MD5;content=DOCUMENT" } };
+        var result = await Build(mock.Object).TransactionStatusChange(Req.Webhook(body, qs));
+        Assert.Equal(PaymentStatusEnum.Rejected, result.PaymentStatus);
+    }
+
+    [Fact]
+    public async Task TransactionStatusChange_ValidSignature_PENDING_ReturnsProcessing()
+    {
+        var body = """{"order":{"status":"PENDING","orderId":"order_1"}}""";
+        var mock = new Mock<IPayUServiceCaller>();
+        mock.Setup(m => m.VerifySignature(body, It.IsAny<string>())).Returns(true);
+        var qs = new Dictionary<string, StringValues> { { "OpenPayU-Signature", "sender=test;signature=valid;algorithm=MD5;content=DOCUMENT" } };
+        var result = await Build(mock.Object).TransactionStatusChange(Req.Webhook(body, qs));
+        Assert.Equal(PaymentStatusEnum.Processing, result.PaymentStatus);
+    }
+
+    [Fact]
+    public async Task TransactionStatusChange_InvalidSignature_ReturnsRejected()
+    {
+        var mock = new Mock<IPayUServiceCaller>();
+        mock.Setup(m => m.VerifySignature(It.IsAny<string>(), It.IsAny<string>())).Returns(false);
+        var qs = new Dictionary<string, StringValues> { { "OpenPayU-Signature", "bad" } };
+        var result = await Build(mock.Object).TransactionStatusChange(Req.Webhook("{}", qs));
+        Assert.Equal(PaymentStatusEnum.Rejected, result.PaymentStatus);
+    }
+}
+
+// ─── Przelewy24 ───────────────────────────────────────────────────────────────
+
+/// <summary>Unit testy dla Przelewy24Provider.</summary>
+public class Przelewy24ProviderTests
+{
+    private static IOptions<Przelewy24ServiceOptions> DefaultOptions() =>
+        Options.Create(new Przelewy24ServiceOptions
+        {
+            MerchantId = 12345,
+            ServiceUrl = "https://sandbox.przelewy24.pl",
+            NotifyUrl = "https://example.com/notify",
+            ReturnUrl = "https://example.com/return",
+        });
+
+    private static Przelewy24Provider Build(IPrzelewy24ServiceCaller caller) => new(caller, DefaultOptions());
+
+    [Fact]
+    public void Provider_Key_IsPrzelewy24() => Assert.Equal("Przelewy24", Build(Mock.Of<IPrzelewy24ServiceCaller>()).Key);
+
+    [Fact]
+    public async Task GetChannels_PLN_NotEmpty()
+    {
+        var channels = await Build(Mock.Of<IPrzelewy24ServiceCaller>()).GetPaymentChannels("PLN");
+        Assert.NotEmpty(channels);
+    }
+
+    [Fact]
+    public async Task GetChannels_EUR_ContainsCard()
+    {
+        var channels = await Build(Mock.Of<IPrzelewy24ServiceCaller>()).GetPaymentChannels("EUR");
+        Assert.Contains(channels, c => c.Id == "card");
+    }
+
+    [Fact]
+    public async Task GetChannels_USD_ContainsCard()
+    {
+        var channels = await Build(Mock.Of<IPrzelewy24ServiceCaller>()).GetPaymentChannels("USD");
+        Assert.Contains(channels, c => c.Id == "card");
+    }
+
+    [Fact]
+    public async Task RequestPayment_Success_ReturnsCreated()
+    {
+        var mock = new Mock<IPrzelewy24ServiceCaller>();
+        mock.Setup(m => m.RegisterTransactionAsync(It.IsAny<PaymentRequest>(), It.IsAny<string>()))
+            .ReturnsAsync(("token_p24_abc", null));
+
+        var result = await Build(mock.Object).RequestPayment(Req.Make());
+
+        Assert.Equal(PaymentStatusEnum.Created, result.PaymentStatus);
+        Assert.NotEmpty(result.RedirectUrl!);
+        Assert.Contains("token_p24_abc", result.RedirectUrl);
+    }
+
+    [Fact]
+    public async Task RequestPayment_ApiError_ReturnsRejected()
+    {
+        var mock = new Mock<IPrzelewy24ServiceCaller>();
+        mock.Setup(m => m.RegisterTransactionAsync(It.IsAny<PaymentRequest>(), It.IsAny<string>()))
+            .ReturnsAsync((null, "Bad credentials"));
+
+        var result = await Build(mock.Object).RequestPayment(Req.Make());
+        Assert.Equal(PaymentStatusEnum.Rejected, result.PaymentStatus);
+    }
+
+    [Fact]
+    public async Task GetStatus_ReturnsProcessing()
+    {
+        var result = await Build(Mock.Of<IPrzelewy24ServiceCaller>()).GetStatus("sess_1");
+        Assert.Equal(PaymentStatusEnum.Processing, result.PaymentStatus);
+    }
+
+    [Fact]
+    public async Task TransactionStatusChange_ValidSignature_VerifyOk_ReturnsFinished()
+    {
+        var body = """{"sessionId":"sess_1","amount":999,"currency":"PLN","orderId":12345}""";
+        var mock = new Mock<IPrzelewy24ServiceCaller>();
+        mock.Setup(m => m.VerifyNotification(body)).Returns(true);
+        mock.Setup(m => m.VerifyTransactionAsync("sess_1", 999, "PLN", 12345)).ReturnsAsync(PaymentStatusEnum.Finished);
+        var result = await Build(mock.Object).TransactionStatusChange(Req.Webhook(body));
+        Assert.Equal(PaymentStatusEnum.Finished, result.PaymentStatus);
+    }
+
+    [Fact]
+    public async Task TransactionStatusChange_ValidSignature_VerifyFails_ReturnsRejected()
+    {
+        var body = """{"sessionId":"sess_1","amount":999,"currency":"PLN","orderId":12345}""";
+        var mock = new Mock<IPrzelewy24ServiceCaller>();
+        mock.Setup(m => m.VerifyNotification(body)).Returns(true);
+        mock.Setup(m => m.VerifyTransactionAsync(It.IsAny<string>(), It.IsAny<long>(), It.IsAny<string>(), It.IsAny<int>()))
+            .ReturnsAsync(PaymentStatusEnum.Rejected);
+        var result = await Build(mock.Object).TransactionStatusChange(Req.Webhook(body));
+        Assert.Equal(PaymentStatusEnum.Rejected, result.PaymentStatus);
+    }
+
+    [Fact]
+    public async Task TransactionStatusChange_InvalidSignature_ReturnsRejected()
+    {
+        var mock = new Mock<IPrzelewy24ServiceCaller>();
+        mock.Setup(m => m.VerifyNotification(It.IsAny<string>())).Returns(false);
+        var result = await Build(mock.Object).TransactionStatusChange(Req.Webhook("{}"));
+        Assert.Equal(PaymentStatusEnum.Rejected, result.PaymentStatus);
+    }
+
+    [Fact]
+    public async Task TransactionStatusChange_MalformedJson_ReturnsRejected()
+    {
+        var mock = new Mock<IPrzelewy24ServiceCaller>();
+        mock.Setup(m => m.VerifyNotification(It.IsAny<string>())).Returns(true);
+        var result = await Build(mock.Object).TransactionStatusChange(Req.Webhook("not json"));
+        Assert.Equal(PaymentStatusEnum.Rejected, result.PaymentStatus);
+    }
+}
+
+// ─── Tpay ─────────────────────────────────────────────────────────────────────
+
+/// <summary>Unit testy dla TpayProvider.</summary>
+public class TpayProviderTests
+{
+    private static TpayProvider Build(ITpayServiceCaller caller) => new(caller);
+
+    [Fact]
+    public void Provider_Key_IsTpay() => Assert.Equal("Tpay", Build(Mock.Of<ITpayServiceCaller>()).Key);
+
+    [Fact]
+    public async Task GetChannels_PLN_ContainsBlik()
+    {
+        var channels = await Build(Mock.Of<ITpayServiceCaller>()).GetPaymentChannels("PLN");
+        Assert.Contains(channels, c => c.Id == "blik");
+    }
+
+    [Fact]
+    public async Task GetChannels_EUR_ContainsCard()
+    {
+        var channels = await Build(Mock.Of<ITpayServiceCaller>()).GetPaymentChannels("EUR");
+        Assert.Contains(channels, c => c.Id == "card");
+    }
+
+    [Fact]
+    public async Task RequestPayment_Success_ReturnsCreated()
+    {
+        var mock = new Mock<ITpayServiceCaller>();
+        mock.Setup(m => m.GetAccessTokenAsync()).ReturnsAsync("token_tpay");
+        mock.Setup(m => m.CreateTransactionAsync("token_tpay", It.IsAny<PaymentRequest>()))
+            .ReturnsAsync(("txn_123", "https://pay.tpay.com/txn/abc"));
+
+        var result = await Build(mock.Object).RequestPayment(Req.Make());
+
+        Assert.Equal(PaymentStatusEnum.Created, result.PaymentStatus);
+        Assert.Equal("txn_123", result.PaymentUniqueId);
+        Assert.Equal("https://pay.tpay.com/txn/abc", result.RedirectUrl);
+    }
+
+    [Fact]
+    public async Task RequestPayment_NoTransactionId_ReturnsRejected()
+    {
+        var mock = new Mock<ITpayServiceCaller>();
+        mock.Setup(m => m.GetAccessTokenAsync()).ReturnsAsync("token");
+        mock.Setup(m => m.CreateTransactionAsync(It.IsAny<string>(), It.IsAny<PaymentRequest>()))
+            .ReturnsAsync((null, null));
+
+        var result = await Build(mock.Object).RequestPayment(Req.Make());
+        Assert.Equal(PaymentStatusEnum.Rejected, result.PaymentStatus);
+    }
+
+    [Fact]
+    public async Task GetStatus_Finished()
+    {
+        var mock = new Mock<ITpayServiceCaller>();
+        mock.Setup(m => m.GetAccessTokenAsync()).ReturnsAsync("tok");
+        mock.Setup(m => m.GetTransactionStatusAsync("tok", "txn_1")).ReturnsAsync(PaymentStatusEnum.Finished);
+        var result = await Build(mock.Object).GetStatus("txn_1");
+        Assert.Equal(PaymentStatusEnum.Finished, result.PaymentStatus);
+    }
+
+    [Fact]
+    public async Task TransactionStatusChange_ValidSignature_paid_ReturnsFinished()
+    {
+        var body = """{"id":"txn_1","status":"paid","amount":9.99}""";
+        var mock = new Mock<ITpayServiceCaller>();
+        mock.Setup(m => m.VerifyNotification(body, "valid_sig")).Returns(true);
+        var qs = new Dictionary<string, StringValues> { { "X-Signature", "valid_sig" } };
+        var result = await Build(mock.Object).TransactionStatusChange(Req.Webhook(body, qs));
+        Assert.Equal(PaymentStatusEnum.Finished, result.PaymentStatus);
+    }
+
+    [Fact]
+    public async Task TransactionStatusChange_ValidSignature_pending_ReturnsProcessing()
+    {
+        var body = """{"id":"txn_1","status":"pending","amount":9.99}""";
+        var mock = new Mock<ITpayServiceCaller>();
+        mock.Setup(m => m.VerifyNotification(body, "sig")).Returns(true);
+        var qs = new Dictionary<string, StringValues> { { "X-Signature", "sig" } };
+        var result = await Build(mock.Object).TransactionStatusChange(Req.Webhook(body, qs));
+        Assert.Equal(PaymentStatusEnum.Processing, result.PaymentStatus);
+    }
+
+    [Fact]
+    public async Task TransactionStatusChange_ValidSignature_error_ReturnsRejected()
+    {
+        var body = """{"id":"txn_1","status":"error","amount":9.99}""";
+        var mock = new Mock<ITpayServiceCaller>();
+        mock.Setup(m => m.VerifyNotification(body, "sig")).Returns(true);
+        var qs = new Dictionary<string, StringValues> { { "X-Signature", "sig" } };
+        var result = await Build(mock.Object).TransactionStatusChange(Req.Webhook(body, qs));
+        Assert.Equal(PaymentStatusEnum.Rejected, result.PaymentStatus);
+    }
+
+    [Fact]
+    public async Task TransactionStatusChange_InvalidSignature_ReturnsRejected()
+    {
+        var mock = new Mock<ITpayServiceCaller>();
+        mock.Setup(m => m.VerifyNotification(It.IsAny<string>(), It.IsAny<string>())).Returns(false);
+        var qs = new Dictionary<string, StringValues> { { "X-Signature", "bad" } };
+        var result = await Build(mock.Object).TransactionStatusChange(Req.Webhook("{}", qs));
+        Assert.Equal(PaymentStatusEnum.Rejected, result.PaymentStatus);
+    }
+}
+
+// ─── HotPay ───────────────────────────────────────────────────────────────────
+
+/// <summary>Unit testy dla HotPayProvider.</summary>
+public class HotPayProviderTests
+{
+    private static HotPayProvider Build(IHotPayServiceCaller caller) => new(caller);
+
+    [Fact]
+    public void Provider_Key_IsHotPay() => Assert.Equal("HotPay", Build(Mock.Of<IHotPayServiceCaller>()).Key);
+
+    [Fact]
+    public async Task GetChannels_PLN_NotEmpty()
+    {
+        var channels = await Build(Mock.Of<IHotPayServiceCaller>()).GetPaymentChannels("PLN");
+        Assert.NotEmpty(channels);
+    }
+
+    [Fact]
+    public async Task RequestPayment_Success_ReturnsCreated()
+    {
+        var mock = new Mock<IHotPayServiceCaller>();
+        mock.Setup(m => m.InitPaymentAsync(It.IsAny<PaymentRequest>(), It.IsAny<string>()))
+            .ReturnsAsync(("pay_abc", "https://hotpay.pl/pay/abc"));
+
+        var result = await Build(mock.Object).RequestPayment(Req.Make());
+
+        Assert.Equal(PaymentStatusEnum.Created, result.PaymentStatus);
+        Assert.Equal("https://hotpay.pl/pay/abc", result.RedirectUrl);
+        Assert.NotEmpty(result.PaymentUniqueId!);
+    }
+
+    [Fact]
+    public async Task RequestPayment_NoUrl_ReturnsRejected()
+    {
+        var mock = new Mock<IHotPayServiceCaller>();
+        mock.Setup(m => m.InitPaymentAsync(It.IsAny<PaymentRequest>(), It.IsAny<string>()))
+            .ReturnsAsync((null, null));
+
+        var result = await Build(mock.Object).RequestPayment(Req.Make());
+        Assert.Equal(PaymentStatusEnum.Rejected, result.PaymentStatus);
+    }
+
+    [Fact]
+    public async Task GetStatus_ReturnsProcessing()
+    {
+        var result = await Build(Mock.Of<IHotPayServiceCaller>()).GetStatus("pay_1");
+        Assert.Equal(PaymentStatusEnum.Processing, result.PaymentStatus);
+    }
+
+    [Fact]
+    public async Task TransactionStatusChange_ValidHash_SUCCESS_ReturnsFinished()
+    {
+        var mock = new Mock<IHotPayServiceCaller>();
+        mock.Setup(m => m.VerifyNotification("valid_hash", "9.99", "pay_1", "SUCCESS")).Returns(true);
+        var qs = new Dictionary<string, StringValues>
+        {
+            { "HASH",         "valid_hash" },
+            { "KWOTA",        "9.99" },
+            { "ID_PLATNOSCI", "pay_1" },
+            { "STATUS",       "SUCCESS" },
+        };
+        var result = await Build(mock.Object).TransactionStatusChange(Req.Webhook("", qs));
+        Assert.Equal(PaymentStatusEnum.Finished, result.PaymentStatus);
+    }
+
+    [Fact]
+    public async Task TransactionStatusChange_ValidHash_FAILURE_ReturnsRejected()
+    {
+        var mock = new Mock<IHotPayServiceCaller>();
+        mock.Setup(m => m.VerifyNotification("h", "9.99", "pay_1", "FAILURE")).Returns(true);
+        var qs = new Dictionary<string, StringValues>
+        {
+            { "HASH",         "h" },
+            { "KWOTA",        "9.99" },
+            { "ID_PLATNOSCI", "pay_1" },
+            { "STATUS",       "FAILURE" },
+        };
+        var result = await Build(mock.Object).TransactionStatusChange(Req.Webhook("", qs));
+        Assert.Equal(PaymentStatusEnum.Rejected, result.PaymentStatus);
+    }
+
+    [Fact]
+    public async Task TransactionStatusChange_InvalidHash_ReturnsRejected()
+    {
+        var mock = new Mock<IHotPayServiceCaller>();
+        mock.Setup(m => m.VerifyNotification(It.IsAny<string>(), It.IsAny<string>(), It.IsAny<string>(), It.IsAny<string>())).Returns(false);
+        var qs = new Dictionary<string, StringValues>
+        {
+            { "HASH",         "bad" },
+            { "KWOTA",        "9.99" },
+            { "ID_PLATNOSCI", "pay_1" },
+            { "STATUS",       "SUCCESS" },
+        };
+        var result = await Build(mock.Object).TransactionStatusChange(Req.Webhook("", qs));
+        Assert.Equal(PaymentStatusEnum.Rejected, result.PaymentStatus);
+    }
+}
+
+// ─── PayNow ───────────────────────────────────────────────────────────────────
+
+/// <summary>Unit testy dla PayNowProvider.</summary>
+public class PayNowProviderTests
+{
+    private static PayNowProvider Build(IPayNowServiceCaller caller) => new(caller);
+
+    [Fact]
+    public void Provider_Key_IsPayNow() => Assert.Equal("PayNow", Build(Mock.Of<IPayNowServiceCaller>()).Key);
+
+    [Fact]
+    public async Task GetChannels_PLN_ContainsBlik()
+    {
+        var channels = await Build(Mock.Of<IPayNowServiceCaller>()).GetPaymentChannels("PLN");
+        Assert.Contains(channels, c => c.Id == "BLIK");
+    }
+
+    [Fact]
+    public async Task RequestPayment_Success_ReturnsCreated()
+    {
+        var mock = new Mock<IPayNowServiceCaller>();
+        mock.Setup(m => m.CreatePaymentAsync(It.IsAny<PaymentRequest>()))
+            .ReturnsAsync(("pn_abc", "https://api.paynow.pl/checkout/pn_abc"));
+
+        var result = await Build(mock.Object).RequestPayment(Req.Make());
+
+        Assert.Equal(PaymentStatusEnum.Created, result.PaymentStatus);
+        Assert.Equal("pn_abc", result.PaymentUniqueId);
+        Assert.Equal("https://api.paynow.pl/checkout/pn_abc", result.RedirectUrl);
+    }
+
+    [Fact]
+    public async Task RequestPayment_ApiError_ReturnsRejected()
+    {
+        var mock = new Mock<IPayNowServiceCaller>();
+        mock.Setup(m => m.CreatePaymentAsync(It.IsAny<PaymentRequest>())).ReturnsAsync((null, null));
+
+        var result = await Build(mock.Object).RequestPayment(Req.Make());
+        Assert.Equal(PaymentStatusEnum.Rejected, result.PaymentStatus);
+    }
+
+    [Fact]
+    public async Task GetStatus_Confirmed_ReturnsFinished()
+    {
+        var mock = new Mock<IPayNowServiceCaller>();
+        mock.Setup(m => m.GetPaymentStatusAsync("pn_1")).ReturnsAsync(PaymentStatusEnum.Finished);
+        var result = await Build(mock.Object).GetStatus("pn_1");
+        Assert.Equal(PaymentStatusEnum.Finished, result.PaymentStatus);
+    }
+
+    [Fact]
+    public async Task GetStatus_Pending_ReturnsProcessing()
+    {
+        var mock = new Mock<IPayNowServiceCaller>();
+        mock.Setup(m => m.GetPaymentStatusAsync("pn_1")).ReturnsAsync(PaymentStatusEnum.Processing);
+        var result = await Build(mock.Object).GetStatus("pn_1");
+        Assert.Equal(PaymentStatusEnum.Processing, result.PaymentStatus);
+    }
+
+    [Fact]
+    public async Task TransactionStatusChange_ValidSignature_CONFIRMED_ReturnsFinished()
+    {
+        var body = """{"paymentId":"pn_1","status":"CONFIRMED"}""";
+        var mock = new Mock<IPayNowServiceCaller>();
+        mock.Setup(m => m.VerifySignature(body, "valid_sig")).Returns(true);
+        var qs = new Dictionary<string, StringValues> { { "Signature", "valid_sig" } };
+        var result = await Build(mock.Object).TransactionStatusChange(Req.Webhook(body, qs));
+        Assert.Equal(PaymentStatusEnum.Finished, result.PaymentStatus);
+    }
+
+    [Fact]
+    public async Task TransactionStatusChange_ValidSignature_PENDING_ReturnsProcessing()
+    {
+        var body = """{"paymentId":"pn_1","status":"PENDING"}""";
+        var mock = new Mock<IPayNowServiceCaller>();
+        mock.Setup(m => m.VerifySignature(body, "sig")).Returns(true);
+        var qs = new Dictionary<string, StringValues> { { "Signature", "sig" } };
+        var result = await Build(mock.Object).TransactionStatusChange(Req.Webhook(body, qs));
+        Assert.Equal(PaymentStatusEnum.Processing, result.PaymentStatus);
+    }
+
+    [Fact]
+    public async Task TransactionStatusChange_ValidSignature_ERROR_ReturnsRejected()
+    {
+        var body = """{"paymentId":"pn_1","status":"ERROR"}""";
+        var mock = new Mock<IPayNowServiceCaller>();
+        mock.Setup(m => m.VerifySignature(body, "sig")).Returns(true);
+        var qs = new Dictionary<string, StringValues> { { "Signature", "sig" } };
+        var result = await Build(mock.Object).TransactionStatusChange(Req.Webhook(body, qs));
+        Assert.Equal(PaymentStatusEnum.Rejected, result.PaymentStatus);
+    }
+
+    [Fact]
+    public async Task TransactionStatusChange_InvalidSignature_ReturnsRejected()
+    {
+        var mock = new Mock<IPayNowServiceCaller>();
+        mock.Setup(m => m.VerifySignature(It.IsAny<string>(), It.IsAny<string>())).Returns(false);
+        var qs = new Dictionary<string, StringValues> { { "Signature", "bad" } };
+        var result = await Build(mock.Object).TransactionStatusChange(Req.Webhook("{}", qs));
+        Assert.Equal(PaymentStatusEnum.Rejected, result.PaymentStatus);
+    }
+}
+
+// ─── Revolut ──────────────────────────────────────────────────────────────────
+
+/// <summary>Unit testy dla RevolutProvider.</summary>
+public class RevolutProviderTests
+{
+    private static RevolutProvider Build(IRevolutServiceCaller caller) => new(caller);
+
+    [Fact]
+    public void Provider_Key_IsRevolut() => Assert.Equal("Revolut", Build(Mock.Of<IRevolutServiceCaller>()).Key);
+
+    [Fact]
+    public async Task GetChannels_PLN_ContainsRevolutPay()
+    {
+        var channels = await Build(Mock.Of<IRevolutServiceCaller>()).GetPaymentChannels("PLN");
+        Assert.Contains(channels, c => c.Id == "revolut_pay");
+    }
+
+    [Fact]
+    public async Task GetChannels_EUR_ContainsCard()
+    {
+        var channels = await Build(Mock.Of<IRevolutServiceCaller>()).GetPaymentChannels("EUR");
+        Assert.Contains(channels, c => c.Id == "card");
+    }
+
+    [Fact]
+    public async Task RequestPayment_Success_ReturnsCreated()
+    {
+        var mock = new Mock<IRevolutServiceCaller>();
+        mock.Setup(m => m.CreateOrderAsync(It.IsAny<PaymentRequest>()))
+            .ReturnsAsync(("rev_abc", "https://checkout.revolut.com/pay/abc"));
+
+        var result = await Build(mock.Object).RequestPayment(Req.Make());
+
+        Assert.Equal(PaymentStatusEnum.Created, result.PaymentStatus);
+        Assert.Equal("rev_abc", result.PaymentUniqueId);
+        Assert.Equal("https://checkout.revolut.com/pay/abc", result.RedirectUrl);
+    }
+
+    [Fact]
+    public async Task RequestPayment_ApiError_ReturnsRejected()
+    {
+        var mock = new Mock<IRevolutServiceCaller>();
+        mock.Setup(m => m.CreateOrderAsync(It.IsAny<PaymentRequest>())).ReturnsAsync((null, null));
+
+        var result = await Build(mock.Object).RequestPayment(Req.Make());
+        Assert.Equal(PaymentStatusEnum.Rejected, result.PaymentStatus);
+    }
+
+    [Fact]
+    public async Task GetStatus_Completed_ReturnsFinished()
+    {
+        var mock = new Mock<IRevolutServiceCaller>();
+        mock.Setup(m => m.GetOrderAsync("rev_1")).ReturnsAsync(("completed", "rev_1"));
+        var result = await Build(mock.Object).GetStatus("rev_1");
+        Assert.Equal(PaymentStatusEnum.Finished, result.PaymentStatus);
+    }
+
+    [Fact]
+    public async Task GetStatus_Pending_ReturnsProcessing()
+    {
+        var mock = new Mock<IRevolutServiceCaller>();
+        mock.Setup(m => m.GetOrderAsync("rev_1")).ReturnsAsync(("pending", "rev_1"));
+        var result = await Build(mock.Object).GetStatus("rev_1");
+        Assert.Equal(PaymentStatusEnum.Processing, result.PaymentStatus);
+    }
+
+    [Fact]
+    public async Task GetStatus_Cancelled_ReturnsRejected()
+    {
+        var mock = new Mock<IRevolutServiceCaller>();
+        mock.Setup(m => m.GetOrderAsync("rev_1")).ReturnsAsync(("cancelled", "rev_1"));
+        var result = await Build(mock.Object).GetStatus("rev_1");
+        Assert.Equal(PaymentStatusEnum.Rejected, result.PaymentStatus);
+    }
+
+    [Fact]
+    public async Task GetStatus_Unknown_ReturnsFallback()
+    {
+        var mock = new Mock<IRevolutServiceCaller>();
+        mock.Setup(m => m.GetOrderAsync("rev_1")).ReturnsAsync(("authorised", "rev_1"));
+        var result = await Build(mock.Object).GetStatus("rev_1");
+        // authorised → Created or Processing depending on implementation
+        Assert.True(result.PaymentStatus != PaymentStatusEnum.Finished);
+    }
+
+    [Fact]
+    public async Task TransactionStatusChange_ValidSignature_ORDER_COMPLETED_ReturnsFinished()
+    {
+        var body = """{"event":"ORDER_COMPLETED","order_id":"rev_1"}""";
+        var mock = new Mock<IRevolutServiceCaller>();
+        mock.Setup(m => m.VerifyWebhookSignature(body, "1234567890", "v1=valid_sig")).Returns(true);
+        var qs = new Dictionary<string, StringValues>
+        {
+            { "Revolut-Signature",         "v1=valid_sig" },
+            { "Revolut-Request-Timestamp", "1234567890" },
+        };
+        var result = await Build(mock.Object).TransactionStatusChange(Req.Webhook(body, qs));
+        Assert.Equal(PaymentStatusEnum.Finished, result.PaymentStatus);
+    }
+
+    [Fact]
+    public async Task TransactionStatusChange_ValidSignature_ORDER_PAYMENT_DECLINED_ReturnsRejected()
+    {
+        var body = """{"event":"ORDER_PAYMENT_DECLINED","order_id":"rev_1"}""";
+        var mock = new Mock<IRevolutServiceCaller>();
+        mock.Setup(m => m.VerifyWebhookSignature(body, "123", "v1=sig")).Returns(true);
+        var qs = new Dictionary<string, StringValues>
+        {
+            { "Revolut-Signature",         "v1=sig" },
+            { "Revolut-Request-Timestamp", "123" },
+        };
+        var result = await Build(mock.Object).TransactionStatusChange(Req.Webhook(body, qs));
+        Assert.Equal(PaymentStatusEnum.Rejected, result.PaymentStatus);
+    }
+
+    [Fact]
+    public async Task TransactionStatusChange_ValidSignature_ORDER_AUTHORISED_ReturnsProcessing()
+    {
+        var body = """{"event":"ORDER_AUTHORISED","order_id":"rev_1"}""";
+        var mock = new Mock<IRevolutServiceCaller>();
+        mock.Setup(m => m.VerifyWebhookSignature(body, "123", "v1=sig")).Returns(true);
+        var qs = new Dictionary<string, StringValues>
+        {
+            { "Revolut-Signature",         "v1=sig" },
+            { "Revolut-Request-Timestamp", "123" },
+        };
+        var result = await Build(mock.Object).TransactionStatusChange(Req.Webhook(body, qs));
+        Assert.Equal(PaymentStatusEnum.Processing, result.PaymentStatus);
+    }
+
+    [Fact]
+    public async Task TransactionStatusChange_InvalidSignature_ReturnsRejected()
+    {
+        var mock = new Mock<IRevolutServiceCaller>();
+        mock.Setup(m => m.VerifyWebhookSignature(It.IsAny<string>(), It.IsAny<string>(), It.IsAny<string>())).Returns(false);
+        var qs = new Dictionary<string, StringValues>
+        {
+            { "Revolut-Signature",         "v1=bad" },
+            { "Revolut-Request-Timestamp", "123" },
+        };
+        var result = await Build(mock.Object).TransactionStatusChange(Req.Webhook("{}", qs));
+        Assert.Equal(PaymentStatusEnum.Rejected, result.PaymentStatus);
+    }
+}
diff --git a/tests/TailoredApps.Shared.Payments.Tests/ServiceCallerHttpTests.cs b/tests/TailoredApps.Shared.Payments.Tests/ServiceCallerHttpTests.cs
new file mode 100644
index 0000000..c4edacc
--- /dev/null
+++ b/tests/TailoredApps.Shared.Payments.Tests/ServiceCallerHttpTests.cs
@@ -0,0 +1,913 @@
+#nullable enable
+using System;
+using System.Collections.Generic;
+using System.Net;
+using System.Net.Http;
+using System.Text;
+using System.Threading;
+using System.Threading.Tasks;
+using Microsoft.Extensions.Configuration;
+using Microsoft.Extensions.Options;
+using Moq;
+using TailoredApps.Shared.Payments;
+using TailoredApps.Shared.Payments.Provider.Adyen;
+using TailoredApps.Shared.Payments.Provider.HotPay;
+using TailoredApps.Shared.Payments.Provider.PayNow;
+using TailoredApps.Shared.Payments.Provider.PayU;
+using TailoredApps.Shared.Payments.Provider.Przelewy24;
+using TailoredApps.Shared.Payments.Provider.Revolut;
+using TailoredApps.Shared.Payments.Provider.Tpay;
+using Xunit;
+
+namespace TailoredApps.Shared.Payments.Tests;
+
+// ────────────────────────────────────────────────────────────────────────────
+// HTTP mock helper
+// ────────────────────────────────────────────────────────────────────────────
+
+file sealed class MockHttpHandler : HttpMessageHandler
+{
+    private readonly Func<HttpRequestMessage, HttpResponseMessage> _handler;
+    public MockHttpHandler(Func<HttpRequestMessage, HttpResponseMessage> handler) => _handler = handler;
+    protected override Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
+        => Task.FromResult(_handler(request));
+}
+
+file static class HttpFactory
+{
+    public static IHttpClientFactory Create(string responseJson, HttpStatusCode status = HttpStatusCode.OK)
+    {
+        var handler = new MockHttpHandler(_ =>
+            new HttpResponseMessage(status) { Content = new StringContent(responseJson, Encoding.UTF8, "application/json") });
+        var mock = new Mock<IHttpClientFactory>();
+        mock.Setup(f => f.CreateClient(It.IsAny<string>())).Returns(new HttpClient(handler));
+        return mock.Object;
+    }
+
+    public static IHttpClientFactory CreateRedirect(string json, string locationUrl)
+    {
+        var handler = new MockHttpHandler(req =>
+        {
+            var resp = new HttpResponseMessage(HttpStatusCode.Found);
+            resp.Headers.Location = new Uri(locationUrl);
+            resp.Content = new StringContent(json, Encoding.UTF8, "application/json");
+            return resp;
+        });
+        var mock = new Mock<IHttpClientFactory>();
+        mock.Setup(f => f.CreateClient(It.IsAny<string>())).Returns(new HttpClient(handler) { BaseAddress = new Uri("https://example.com") });
+        return mock.Object;
+    }
+}
+
+// ────────────────────────────────────────────────────────────────────────────
+// TpayServiceCaller — HTTP method tests
+// ────────────────────────────────────────────────────────────────────────────
+
+public class TpayServiceCallerHttpTests
+{
+    private static TpayServiceCaller Build(IHttpClientFactory factory, string serviceUrl = "https://api.tpay.com")
+        => new(Options.Create(new TpayServiceOptions
+        {
+            ClientId = "client_1",
+            ClientSecret = "secret_1",
+            SecurityCode = "sec",
+            ServiceUrl = serviceUrl,
+            ReturnUrl = "https://example.com/return",
+            NotifyUrl = "https://example.com/notify",
+        }), factory);
+
+    [Fact]
+    public async Task GetAccessTokenAsync_ValidResponse_ReturnsToken()
+    {
+        var factory = HttpFactory.Create("""{"access_token":"tok_abc","token_type":"Bearer"}""");
+        var caller = Build(factory);
+        var token = await caller.GetAccessTokenAsync();
+        Assert.Equal("tok_abc", token);
+    }
+
+    [Fact]
+    public async Task CreateTransactionAsync_ValidResponse_ReturnsIdAndUrl()
+    {
+        var factory = HttpFactory.Create("""{"transactionId":"txn_123","transactionPaymentUrl":"https://pay.tpay.com/abc"}""");
+        var caller = Build(factory);
+        var (id, url) = await caller.CreateTransactionAsync("tok", new PaymentRequest
+        {
+            Amount = 9.99m,
+            Currency = "PLN",
+            Email = "test@example.com",
+            Title = "Test",
+            FirstName = "Jan",
+            Surname = "K",
+            PaymentChannel = "blik",
+        });
+        Assert.Equal("txn_123", id);
+        Assert.Equal("https://pay.tpay.com/abc", url);
+    }
+
+    [Fact]
+    public async Task CreateTransactionAsync_NullChannel_StillWorks()
+    {
+        var factory = HttpFactory.Create("""{"transactionId":"txn_1","transactionPaymentUrl":"https://pay.tpay.com/x"}""");
+        var caller = Build(factory);
+        var (id, _) = await caller.CreateTransactionAsync("tok", new PaymentRequest
+        {
+            Amount = 1m,
+            Currency = "PLN",
+        });
+        Assert.Equal("txn_1", id);
+    }
+
+    [Fact]
+    public async Task GetTransactionStatusAsync_Correct_ReturnsFinished()
+    {
+        var factory = HttpFactory.Create("""{"status":"correct"}""");
+        var caller = Build(factory);
+        var status = await caller.GetTransactionStatusAsync("tok", "txn_1");
+        Assert.Equal(PaymentStatusEnum.Finished, status);
+    }
+
+    [Fact]
+    public async Task GetTransactionStatusAsync_Pending_ReturnsProcessing()
+    {
+        var factory = HttpFactory.Create("""{"status":"pending"}""");
+        var caller = Build(factory);
+        var status = await caller.GetTransactionStatusAsync("tok", "txn_1");
+        Assert.Equal(PaymentStatusEnum.Processing, status);
+    }
+
+    [Fact]
+    public async Task GetTransactionStatusAsync_Error_ReturnsRejected()
+    {
+        var factory = HttpFactory.Create("""{"status":"error"}""");
+        var caller = Build(factory);
+        var status = await caller.GetTransactionStatusAsync("tok", "txn_1");
+        Assert.Equal(PaymentStatusEnum.Rejected, status);
+    }
+
+    [Fact]
+    public async Task GetTransactionStatusAsync_Chargeback_ReturnsRejected()
+    {
+        var factory = HttpFactory.Create("""{"status":"chargeback"}""");
+        var caller = Build(factory);
+        var status = await caller.GetTransactionStatusAsync("tok", "txn_1");
+        Assert.Equal(PaymentStatusEnum.Rejected, status);
+    }
+
+    [Fact]
+    public async Task GetTransactionStatusAsync_UnknownStatus_ReturnsCreated()
+    {
+        var factory = HttpFactory.Create("""{"status":"unknown_state"}""");
+        var caller = Build(factory);
+        var status = await caller.GetTransactionStatusAsync("tok", "txn_1");
+        Assert.Equal(PaymentStatusEnum.Created, status);
+    }
+
+    [Fact]
+    public async Task GetTransactionStatusAsync_HttpError_ReturnsRejected()
+    {
+        var factory = HttpFactory.Create("""{}""", HttpStatusCode.InternalServerError);
+        var caller = Build(factory);
+        var status = await caller.GetTransactionStatusAsync("tok", "txn_1");
+        Assert.Equal(PaymentStatusEnum.Rejected, status);
+    }
+}
+
+// ────────────────────────────────────────────────────────────────────────────
+// PayNowServiceCaller — HTTP method tests
+// ────────────────────────────────────────────────────────────────────────────
+
+public class PayNowServiceCallerHttpTests
+{
+    private static PayNowServiceCaller Build(IHttpClientFactory factory)
+        => new(Options.Create(new PayNowServiceOptions
+        {
+            ApiKey = "api_key",
+            SignatureKey = "sig_key",
+            ServiceUrl = "https://api.paynow.pl",
+            ReturnUrl = "https://example.com/return",
+            ContinueUrl = "https://example.com/continue",
+        }), factory);
+
+    [Fact]
+    public async Task CreatePaymentAsync_Success_ReturnsIdAndUrl()
+    {
+        var factory = HttpFactory.Create("""{"paymentId":"pn_abc","status":"NEW","redirectUrl":"https://api.paynow.pl/checkout/pn_abc"}""");
+        var caller = Build(factory);
+        var (id, url) = await caller.CreatePaymentAsync(new PaymentRequest
+        {
+            Amount = 9.99m,
+            Currency = "PLN",
+            Email = "test@example.com",
+            Title = "Test order",
+            AdditionalData = "ext_123",
+        });
+        Assert.Equal("pn_abc", id);
+        Assert.Equal("https://api.paynow.pl/checkout/pn_abc", url);
+    }
+
+    [Fact]
+    public async Task CreatePaymentAsync_NoAdditionalData_GeneratesExternalId()
+    {
+        var factory = HttpFactory.Create("""{"paymentId":"pn_xyz","redirectUrl":"https://api.paynow.pl/checkout/pn_xyz"}""");
+        var caller = Build(factory);
+        var (id, _) = await caller.CreatePaymentAsync(new PaymentRequest
+        {
+            Amount = 1m,
+            Currency = "PLN",
+        });
+        Assert.Equal("pn_xyz", id);
+    }
+
+    [Fact]
+    public async Task GetPaymentStatusAsync_CONFIRMED_ReturnsFinished()
+    {
+        var factory = HttpFactory.Create("""{"status":"CONFIRMED"}""");
+        var caller = Build(factory);
+        var status = await caller.GetPaymentStatusAsync("pn_1");
+        Assert.Equal(PaymentStatusEnum.Finished, status);
+    }
+
+    [Fact]
+    public async Task GetPaymentStatusAsync_PENDING_ReturnsProcessing()
+    {
+        var factory = HttpFactory.Create("""{"status":"PENDING"}""");
+        var caller = Build(factory);
+        var status = await caller.GetPaymentStatusAsync("pn_1");
+        Assert.Equal(PaymentStatusEnum.Processing, status);
+    }
+
+    [Fact]
+    public async Task GetPaymentStatusAsync_PROCESSING_ReturnsProcessing()
+    {
+        var factory = HttpFactory.Create("""{"status":"PROCESSING"}""");
+        var caller = Build(factory);
+        var status = await caller.GetPaymentStatusAsync("pn_1");
+        Assert.Equal(PaymentStatusEnum.Processing, status);
+    }
+
+    [Fact]
+    public async Task GetPaymentStatusAsync_NEW_ReturnsCreated()
+    {
+        var factory = HttpFactory.Create("""{"status":"NEW"}""");
+        var caller = Build(factory);
+        var status = await caller.GetPaymentStatusAsync("pn_1");
+        Assert.Equal(PaymentStatusEnum.Created, status);
+    }
+
+    [Fact]
+    public async Task GetPaymentStatusAsync_ERROR_ReturnsRejected()
+    {
+        var factory = HttpFactory.Create("""{"status":"ERROR"}""");
+        var caller = Build(factory);
+        var status = await caller.GetPaymentStatusAsync("pn_1");
+        Assert.Equal(PaymentStatusEnum.Rejected, status);
+    }
+
+    [Fact]
+    public async Task GetPaymentStatusAsync_REJECTED_ReturnsRejected()
+    {
+        var factory = HttpFactory.Create("""{"status":"REJECTED"}""");
+        var caller = Build(factory);
+        var status = await caller.GetPaymentStatusAsync("pn_1");
+        Assert.Equal(PaymentStatusEnum.Rejected, status);
+    }
+
+    [Fact]
+    public async Task GetPaymentStatusAsync_ABANDONED_ReturnsRejected()
+    {
+        var factory = HttpFactory.Create("""{"status":"ABANDONED"}""");
+        var caller = Build(factory);
+        var status = await caller.GetPaymentStatusAsync("pn_1");
+        Assert.Equal(PaymentStatusEnum.Rejected, status);
+    }
+
+    [Fact]
+    public async Task GetPaymentStatusAsync_Unknown_ReturnsCreated()
+    {
+        var factory = HttpFactory.Create("""{"status":"BLAH"}""");
+        var caller = Build(factory);
+        var status = await caller.GetPaymentStatusAsync("pn_1");
+        Assert.Equal(PaymentStatusEnum.Created, status);
+    }
+
+    [Fact]
+    public async Task GetPaymentStatusAsync_HttpError_ReturnsRejected()
+    {
+        var factory = HttpFactory.Create("{}", HttpStatusCode.InternalServerError);
+        var caller = Build(factory);
+        var status = await caller.GetPaymentStatusAsync("pn_1");
+        Assert.Equal(PaymentStatusEnum.Rejected, status);
+    }
+}
+
+// ────────────────────────────────────────────────────────────────────────────
+// PayUServiceCaller — HTTP method tests
+// ────────────────────────────────────────────────────────────────────────────
+
+public class PayUServiceCallerHttpTests
+{
+    private static PayUServiceCaller Build(IHttpClientFactory factory)
+        => new(Options.Create(new PayUServiceOptions
+        {
+            ClientId = "client",
+            ClientSecret = "secret",
+            PosId = "pos123",
+            SignatureKey = "sigkey",
+            ServiceUrl = "https://secure.snd.payu.com",
+            NotifyUrl = "https://example.com/notify",
+            ContinueUrl = "https://example.com/continue",
+        }), factory);
+
+    [Fact]
+    public async Task GetAccessTokenAsync_ValidResponse_ReturnsToken()
+    {
+        var factory = HttpFactory.Create("""{"access_token":"tok_payu","token_type":"bearer","expires_in":3600}""");
+        var caller = Build(factory);
+        var token = await caller.GetAccessTokenAsync();
+        Assert.Equal("tok_payu", token);
+    }
+
+    [Fact]
+    public async Task GetOrderStatusAsync_COMPLETED_ReturnsFinished()
+    {
+        var factory = HttpFactory.Create("""{"orders":[{"orderId":"ord_1","status":"COMPLETED"}]}""");
+        var caller = Build(factory);
+        var status = await caller.GetOrderStatusAsync("tok", "ord_1");
+        Assert.Equal(PaymentStatusEnum.Finished, status);
+    }
+
+    [Fact]
+    public async Task GetOrderStatusAsync_WAITING_FOR_CONFIRMATION_ReturnsProcessing()
+    {
+        var factory = HttpFactory.Create("""{"orders":[{"orderId":"ord_1","status":"WAITING_FOR_CONFIRMATION"}]}""");
+        var caller = Build(factory);
+        var status = await caller.GetOrderStatusAsync("tok", "ord_1");
+        Assert.Equal(PaymentStatusEnum.Processing, status);
+    }
+
+    [Fact]
+    public async Task GetOrderStatusAsync_PENDING_ReturnsProcessing()
+    {
+        var factory = HttpFactory.Create("""{"orders":[{"orderId":"ord_1","status":"PENDING"}]}""");
+        var caller = Build(factory);
+        var status = await caller.GetOrderStatusAsync("tok", "ord_1");
+        Assert.Equal(PaymentStatusEnum.Processing, status);
+    }
+
+    [Fact]
+    public async Task GetOrderStatusAsync_CANCELED_ReturnsRejected()
+    {
+        var factory = HttpFactory.Create("""{"orders":[{"orderId":"ord_1","status":"CANCELED"}]}""");
+        var caller = Build(factory);
+        var status = await caller.GetOrderStatusAsync("tok", "ord_1");
+        Assert.Equal(PaymentStatusEnum.Rejected, status);
+    }
+
+    [Fact]
+    public async Task GetOrderStatusAsync_REJECTED_ReturnsRejected()
+    {
+        var factory = HttpFactory.Create("""{"orders":[{"orderId":"ord_1","status":"REJECTED"}]}""");
+        var caller = Build(factory);
+        var status = await caller.GetOrderStatusAsync("tok", "ord_1");
+        Assert.Equal(PaymentStatusEnum.Rejected, status);
+    }
+
+    [Fact]
+    public async Task GetOrderStatusAsync_Unknown_ReturnsCreated()
+    {
+        var factory = HttpFactory.Create("""{"orders":[{"orderId":"ord_1","status":"NEW"}]}""");
+        var caller = Build(factory);
+        var status = await caller.GetOrderStatusAsync("tok", "ord_1");
+        Assert.Equal(PaymentStatusEnum.Created, status);
+    }
+
+    [Fact]
+    public async Task GetOrderStatusAsync_HttpError_ReturnsRejected()
+    {
+        var factory = HttpFactory.Create("{}", HttpStatusCode.InternalServerError);
+        var caller = Build(factory);
+        var status = await caller.GetOrderStatusAsync("tok", "ord_1");
+        Assert.Equal(PaymentStatusEnum.Rejected, status);
+    }
+
+    // Note: CreateOrderAsync uses new HttpClientHandler{AllowAutoRedirect=false} directly,
+    // not the IHttpClientFactory — tested via provider-level mocks in PayUProviderTests.
+    [Fact]
+    public void VerifySignature_DefaultKey_Truthy()
+    {
+        // Smoke test to ensure VerifySignature is exercised (also covered in ServiceCallerUnitTests)
+        var caller = Build(HttpFactory.Create("{}"));
+        Assert.False(caller.VerifySignature("{}", "sender=x;signature=deadbeef;algorithm=MD5"));
+    }
+}
+
+// ────────────────────────────────────────────────────────────────────────────
+// RevolutServiceCaller — HTTP method tests
+// ────────────────────────────────────────────────────────────────────────────
+
+public class RevolutServiceCallerHttpTests
+{
+    private static RevolutServiceCaller Build(IHttpClientFactory factory)
+        => new(Options.Create(new RevolutServiceOptions
+        {
+            ApiKey = "sk_sandbox",
+            ApiUrl = "https://sandbox-merchant.revolut.com/api",
+            ReturnUrl = "https://example.com/return",
+            WebhookSecret = "whsec",
+        }), factory);
+
+    [Fact]
+    public async Task CreateOrderAsync_Success_ReturnsIdAndUrl()
+    {
+        var factory = HttpFactory.Create("""{"id":"rev_abc","checkout_url":"https://checkout.revolut.com/pay/abc","state":"pending"}""");
+        var caller = Build(factory);
+        var (id, url) = await caller.CreateOrderAsync(new PaymentRequest
+        {
+            Amount = 9.99m,
+            Currency = "PLN",
+            Title = "Test",
+            Email = "x@example.com",
+            AdditionalData = "ext_1",
+        });
+        Assert.Equal("rev_abc", id);
+        Assert.Equal("https://checkout.revolut.com/pay/abc", url);
+    }
+
+    [Fact]
+    public async Task CreateOrderAsync_NoAdditionalData_StillWorks()
+    {
+        var factory = HttpFactory.Create("""{"id":"rev_xyz","checkout_url":"https://checkout.revolut.com/pay/xyz"}""");
+        var caller = Build(factory);
+        var (id, _) = await caller.CreateOrderAsync(new PaymentRequest { Amount = 1m, Currency = "EUR" });
+        Assert.Equal("rev_xyz", id);
+    }
+
+    [Fact]
+    public async Task GetOrderAsync_Success_ReturnsStateAndId()
+    {
+        var factory = HttpFactory.Create("""{"id":"rev_1","state":"completed","checkout_url":"https://..."}""");
+        var caller = Build(factory);
+        var (state, id) = await caller.GetOrderAsync("rev_1");
+        Assert.Equal("completed", state);
+        Assert.Equal("rev_1", id);
+    }
+
+    [Fact]
+    public async Task GetOrderAsync_HttpError_ReturnsNullState()
+    {
+        var factory = HttpFactory.Create("{}", HttpStatusCode.NotFound);
+        var caller = Build(factory);
+        var (state, id) = await caller.GetOrderAsync("rev_1");
+        Assert.Null(state);
+        Assert.Equal("rev_1", id);
+    }
+}
+
+// ────────────────────────────────────────────────────────────────────────────
+// AdyenServiceCaller — HTTP method tests
+// ────────────────────────────────────────────────────────────────────────────
+
+public class AdyenServiceCallerHttpTests
+{
+    private static AdyenServiceCaller Build(IHttpClientFactory factory, string checkoutUrl = "https://checkout-test.adyen.com/v71")
+        => new(Options.Create(new AdyenServiceOptions
+        {
+            ApiKey = "AQE_key",
+            MerchantAccount = "TestMerchant",
+            ReturnUrl = "https://example.com/return",
+            NotificationHmacKey = "4142434445464748494a4b4c4d4e4f50",
+            CheckoutUrl = checkoutUrl,
+            Environment = "test",
+        }), factory);
+
+    [Fact]
+    public async Task CreateSessionAsync_Success_ReturnsIdAndUrl()
+    {
+        var factory = HttpFactory.Create("""{"id":"cs_adyen_abc","sessionData":"data_xyz","url":"https://checkoutshopper-test.adyen.com/sessions/cs_adyen_abc"}""");
+        var caller = Build(factory);
+        var (id, url, error) = await caller.CreateSessionAsync(new PaymentRequest
+        {
+            Amount = 9.99m,
+            Currency = "PLN",
+            Email = "x@e.com",
+            AdditionalData = "ext_1",
+            Country = "PL",
+        });
+        Assert.Equal("cs_adyen_abc", id);
+        Assert.NotNull(url);
+        Assert.Null(error);
+    }
+
+    [Fact]
+    public async Task CreateSessionAsync_NoAdditionalData_StillWorks()
+    {
+        var factory = HttpFactory.Create("""{"id":"cs_adyen_xyz","url":"https://test.adyen.com/abc"}""");
+        var caller = Build(factory);
+        var (id, _, error) = await caller.CreateSessionAsync(new PaymentRequest
+        {
+            Amount = 1m,
+            Currency = "EUR",
+        });
+        Assert.Equal("cs_adyen_xyz", id);
+        Assert.Null(error);
+    }
+
+    [Fact]
+    public async Task CreateSessionAsync_HttpError_ReturnsError()
+    {
+        var factory = HttpFactory.Create("""{"status":401,"message":"Unauthorized"}""", HttpStatusCode.Unauthorized);
+        var caller = Build(factory);
+        var (id, url, error) = await caller.CreateSessionAsync(new PaymentRequest { Amount = 1m, Currency = "PLN" });
+        Assert.Null(id);
+        Assert.Null(url);
+        Assert.NotNull(error);
+    }
+
+    [Fact]
+    public async Task GetPaymentStatusAsync_Authorised_ReturnsFinished()
+    {
+        var factory = HttpFactory.Create("""{"status":"Authorised","resultCode":"Authorised"}""");
+        var caller = Build(factory);
+        var status = await caller.GetPaymentStatusAsync("psp_1");
+        Assert.Equal(PaymentStatusEnum.Finished, status);
+    }
+
+    [Fact]
+    public async Task GetPaymentStatusAsync_Refused_ReturnsRejected()
+    {
+        var factory = HttpFactory.Create("""{"resultCode":"Refused"}""");
+        var caller = Build(factory);
+        var status = await caller.GetPaymentStatusAsync("psp_1");
+        Assert.Equal(PaymentStatusEnum.Rejected, status);
+    }
+
+    [Fact]
+    public async Task GetPaymentStatusAsync_Cancelled_ReturnsRejected()
+    {
+        var factory = HttpFactory.Create("""{"resultCode":"Cancelled"}""");
+        var caller = Build(factory);
+        var status = await caller.GetPaymentStatusAsync("psp_1");
+        Assert.Equal(PaymentStatusEnum.Rejected, status);
+    }
+
+    [Fact]
+    public async Task GetPaymentStatusAsync_Pending_ReturnsProcessing()
+    {
+        var factory = HttpFactory.Create("""{"resultCode":"Pending"}""");
+        var caller = Build(factory);
+        var status = await caller.GetPaymentStatusAsync("psp_1");
+        Assert.Equal(PaymentStatusEnum.Processing, status);
+    }
+
+    [Fact]
+    public async Task GetPaymentStatusAsync_Received_ReturnsProcessing()
+    {
+        var factory = HttpFactory.Create("""{"resultCode":"Received"}""");
+        var caller = Build(factory);
+        var status = await caller.GetPaymentStatusAsync("psp_1");
+        Assert.Equal(PaymentStatusEnum.Processing, status);
+    }
+
+    [Fact]
+    public async Task GetPaymentStatusAsync_Unknown_ReturnsCreated()
+    {
+        var factory = HttpFactory.Create("""{"resultCode":"Unknown"}""");
+        var caller = Build(factory);
+        var status = await caller.GetPaymentStatusAsync("psp_1");
+        Assert.Equal(PaymentStatusEnum.Created, status);
+    }
+
+    [Fact]
+    public async Task GetPaymentStatusAsync_HttpError_ReturnsRejected()
+    {
+        var factory = HttpFactory.Create("{}", HttpStatusCode.NotFound);
+        var caller = Build(factory);
+        var status = await caller.GetPaymentStatusAsync("psp_1");
+        Assert.Equal(PaymentStatusEnum.Rejected, status);
+    }
+}
+
+// ────────────────────────────────────────────────────────────────────────────
+// Przelewy24ServiceCaller — HTTP method tests
+// ────────────────────────────────────────────────────────────────────────────
+
+public class Przelewy24ServiceCallerHttpTests
+{
+    private static Przelewy24ServiceCaller Build(IHttpClientFactory factory)
+        => new(Options.Create(new Przelewy24ServiceOptions
+        {
+            MerchantId = 12345,
+            PosId = 12345,
+            ApiKey = "api_key",
+            CrcKey = "crc_key",
+            ServiceUrl = "https://sandbox.przelewy24.pl",
+            NotifyUrl = "https://example.com/notify",
+            ReturnUrl = "https://example.com/return",
+        }), factory);
+
+    [Fact]
+    public async Task RegisterTransactionAsync_Success_ReturnsToken()
+    {
+        var factory = HttpFactory.Create("""{"data":{"token":"p24_tok_abc"}}""");
+        var caller = Build(factory);
+        var (token, error) = await caller.RegisterTransactionAsync(new PaymentRequest
+        {
+            Amount = 10m,
+            Currency = "PLN",
+            Email = "x@example.com",
+            Title = "Test",
+            Description = "Order",
+        }, "sess_test_1");
+        Assert.Equal("p24_tok_abc", token);
+        Assert.Null(error);
+    }
+
+    [Fact]
+    public async Task RegisterTransactionAsync_HttpError_ReturnsError()
+    {
+        var factory = HttpFactory.Create("""{"error":"Unauthorized"}""", HttpStatusCode.Unauthorized);
+        var caller = Build(factory);
+        var (token, error) = await caller.RegisterTransactionAsync(new PaymentRequest
+        {
+            Amount = 1m,
+            Currency = "PLN",
+        }, "sess_1");
+        Assert.Null(token);
+        Assert.NotNull(error);
+    }
+
+    [Fact]
+    public async Task VerifyTransactionAsync_Success_ReturnsFinished()
+    {
+        var factory = HttpFactory.Create("""{"data":{"status":"success"}}""");
+        var caller = Build(factory);
+        var status = await caller.VerifyTransactionAsync("sess_1", 1000, "PLN", 12345);
+        Assert.Equal(PaymentStatusEnum.Finished, status);
+    }
+
+    [Fact]
+    public async Task VerifyTransactionAsync_HttpError_ReturnsRejected()
+    {
+        var factory = HttpFactory.Create("""{"error":"failed"}""", HttpStatusCode.BadRequest);
+        var caller = Build(factory);
+        var status = await caller.VerifyTransactionAsync("sess_1", 1000, "PLN", 12345);
+        Assert.Equal(PaymentStatusEnum.Rejected, status);
+    }
+}
+
+// ────────────────────────────────────────────────────────────────────────────
+// HotPayServiceCaller — HTTP method tests
+// ────────────────────────────────────────────────────────────────────────────
+
+public class HotPayServiceCallerHttpTests
+{
+    private static HotPayServiceCaller Build(IHttpClientFactory factory)
+        => new(Options.Create(new HotPayServiceOptions
+        {
+            SecretHash = "hotpay_secret",
+            ServiceUrl = "https://platnosci.hotpay.pl",
+            ReturnUrl = "https://example.com/return",
+            NotifyUrl = "https://example.com/notify",
+        }), factory);
+
+    [Fact]
+    public async Task InitPaymentAsync_WithRedirectUrl_ReturnsUrl()
+    {
+        var factory = HttpFactory.Create("""{"STATUS":"SUCCESS","PRZEKIERUJ_DO":"https://platnosci.hotpay.pl/pay/abc","ID_PLATNOSCI":"pay_123"}""");
+        var caller = Build(factory);
+        var (id, url) = await caller.InitPaymentAsync(new PaymentRequest
+        {
+            Amount = 9.99m,
+            Currency = "PLN",
+            Title = "Test",
+            Email = "x@e.com",
+        }, "my_pay_id");
+        Assert.Equal("pay_123", id);
+        Assert.Equal("https://platnosci.hotpay.pl/pay/abc", url);
+    }
+
+    [Fact]
+    public async Task InitPaymentAsync_NoPaymentIdInResponse_UsesInputId()
+    {
+        var factory = HttpFactory.Create("""{"STATUS":"SUCCESS","PRZEKIERUJ_DO":"https://hotpay.pl/pay/x"}""");
+        var caller = Build(factory);
+        var (id, url) = await caller.InitPaymentAsync(new PaymentRequest
+        {
+            Amount = 1m,
+            Currency = "PLN",
+            Description = "Desc",
+        }, "fallback_id");
+        Assert.Equal("fallback_id", id);
+        Assert.Equal("https://hotpay.pl/pay/x", url);
+    }
+
+    [Fact]
+    public async Task InitPaymentAsync_WithEmail_SendsPayload()
+    {
+        var factory = HttpFactory.Create("""{"STATUS":"SUCCESS","PRZEKIERUJ_DO":"https://hotpay.pl/p","ID_PLATNOSCI":"p_1"}""");
+        var caller = Build(factory);
+        var (id, _) = await caller.InitPaymentAsync(new PaymentRequest
+        {
+            Amount = 5m,
+            Title = "Service",
+            Email = "user@test.com",
+        }, "p_1");
+        Assert.Equal("p_1", id);
+    }
+}
+
+// ────────────────────────────────────────────────────────────────────────────
+// ConfigureOptions tests
+// ────────────────────────────────────────────────────────────────────────────
+
+public class ConfigureOptionsTests
+{
+    private static IConfiguration BuildConfig(Dictionary<string, string?> kv)
+        => new ConfigurationBuilder().AddInMemoryCollection(kv).Build();
+
+    [Fact]
+    public void TpayConfigureOptions_Configure_SetsAllValues()
+    {
+        var cfg = BuildConfig(new Dictionary<string, string?>
+        {
+            ["Payments:Providers:Tpay:ClientId"] = "cid",
+            ["Payments:Providers:Tpay:ClientSecret"] = "csec",
+            ["Payments:Providers:Tpay:MerchantId"] = "mid",
+            ["Payments:Providers:Tpay:ServiceUrl"] = "https://api.tpay.com",
+            ["Payments:Providers:Tpay:ReturnUrl"] = "https://r.com",
+            ["Payments:Providers:Tpay:NotifyUrl"] = "https://n.com",
+            ["Payments:Providers:Tpay:SecurityCode"] = "sec123",
+        });
+        var configure = new TpayConfigureOptions(cfg);
+        var options = new TpayServiceOptions();
+        configure.Configure(options);
+        Assert.Equal("cid", options.ClientId);
+        Assert.Equal("csec", options.ClientSecret);
+        Assert.Equal("sec123", options.SecurityCode);
+    }
+
+    [Fact]
+    public void TpayConfigureOptions_Configure_NullSection_DoesNotThrow()
+    {
+        var cfg = BuildConfig(new Dictionary<string, string?>());
+        var configure = new TpayConfigureOptions(cfg);
+        var options = new TpayServiceOptions();
+        configure.Configure(options); // should not throw
+    }
+
+    [Fact]
+    public void PayUConfigureOptions_Configure_SetsAllValues()
+    {
+        var cfg = BuildConfig(new Dictionary<string, string?>
+        {
+            ["Payments:Providers:PayU:ClientId"] = "pcid",
+            ["Payments:Providers:PayU:ClientSecret"] = "pcsec",
+            ["Payments:Providers:PayU:PosId"] = "pos123",
+            ["Payments:Providers:PayU:SignatureKey"] = "sigkey",
+            ["Payments:Providers:PayU:ServiceUrl"] = "https://secure.payu.com",
+            ["Payments:Providers:PayU:NotifyUrl"] = "https://n.com",
+            ["Payments:Providers:PayU:ContinueUrl"] = "https://c.com",
+        });
+        var configure = new PayUConfigureOptions(cfg);
+        var options = new PayUServiceOptions();
+        configure.Configure(options);
+        Assert.Equal("pcid", options.ClientId);
+        Assert.Equal("sigkey", options.SignatureKey);
+        Assert.Equal("https://secure.payu.com", options.ServiceUrl);
+    }
+
+    [Fact]
+    public void PayUConfigureOptions_Configure_NullSection_DoesNotThrow()
+    {
+        var cfg = BuildConfig(new Dictionary<string, string?>());
+        new PayUConfigureOptions(cfg).Configure(new PayUServiceOptions());
+    }
+
+    [Fact]
+    public void PayNowConfigureOptions_Configure_SetsAllValues()
+    {
+        var cfg = BuildConfig(new Dictionary<string, string?>
+        {
+            ["Payments:Providers:PayNow:ApiKey"] = "pn_api",
+            ["Payments:Providers:PayNow:SignatureKey"] = "pn_sig",
+            ["Payments:Providers:PayNow:ServiceUrl"] = "https://api.paynow.pl",
+            ["Payments:Providers:PayNow:ReturnUrl"] = "https://r.com",
+            ["Payments:Providers:PayNow:ContinueUrl"] = "https://c.com",
+        });
+        var configure = new PayNowConfigureOptions(cfg);
+        var options = new PayNowServiceOptions();
+        configure.Configure(options);
+        Assert.Equal("pn_api", options.ApiKey);
+        Assert.Equal("pn_sig", options.SignatureKey);
+    }
+
+    [Fact]
+    public void PayNowConfigureOptions_Configure_NullSection_DoesNotThrow()
+    {
+        var cfg = BuildConfig(new Dictionary<string, string?>());
+        new PayNowConfigureOptions(cfg).Configure(new PayNowServiceOptions());
+    }
+
+    [Fact]
+    public void RevolutConfigureOptions_Configure_SetsAllValues()
+    {
+        var cfg = BuildConfig(new Dictionary<string, string?>
+        {
+            ["Payments:Providers:Revolut:ApiKey"] = "sk_rev",
+            ["Payments:Providers:Revolut:ApiUrl"] = "https://merchant.revolut.com/api",
+            ["Payments:Providers:Revolut:ReturnUrl"] = "https://r.com",
+            ["Payments:Providers:Revolut:WebhookSecret"] = "whsec_rev",
+        });
+        var configure = new RevolutConfigureOptions(cfg);
+        var options = new RevolutServiceOptions();
+        configure.Configure(options);
+        Assert.Equal("sk_rev", options.ApiKey);
+        Assert.Equal("whsec_rev", options.WebhookSecret);
+    }
+
+    [Fact]
+    public void RevolutConfigureOptions_Configure_NullSection_DoesNotThrow()
+    {
+        var cfg = BuildConfig(new Dictionary<string, string?>());
+        new RevolutConfigureOptions(cfg).Configure(new RevolutServiceOptions());
+    }
+
+    [Fact]
+    public void AdyenConfigureOptions_Configure_SetsAllValues()
+    {
+        var cfg = BuildConfig(new Dictionary<string, string?>
+        {
+            ["Payments:Providers:Adyen:ApiKey"] = "adyen_api",
+            ["Payments:Providers:Adyen:MerchantAccount"] = "TestMerchant",
+            ["Payments:Providers:Adyen:ClientKey"] = "client_key",
+            ["Payments:Providers:Adyen:ReturnUrl"] = "https://r.com",
+            ["Payments:Providers:Adyen:NotificationHmacKey"] = "hexkey123",
+            ["Payments:Providers:Adyen:IsTest"] = "true",
+        });
+        var configure = new AdyenConfigureOptions(cfg);
+        var options = new AdyenServiceOptions();
+        configure.Configure(options);
+        Assert.Equal("adyen_api", options.ApiKey);
+        Assert.Equal("TestMerchant", options.MerchantAccount);
+        Assert.True(options.IsTest);
+    }
+
+    [Fact]
+    public void AdyenConfigureOptions_Configure_NullSection_DoesNotThrow()
+    {
+        var cfg = BuildConfig(new Dictionary<string, string?>());
+        new AdyenConfigureOptions(cfg).Configure(new AdyenServiceOptions());
+    }
+
+    [Fact]
+    public void HotPayConfigureOptions_Configure_SetsAllValues()
+    {
+        var cfg = BuildConfig(new Dictionary<string, string?>
+        {
+            ["Payments:Providers:HotPay:SecretHash"] = "hotpay_sec",
+            ["Payments:Providers:HotPay:ServiceUrl"] = "https://platnosci.hotpay.pl",
+            ["Payments:Providers:HotPay:ReturnUrl"] = "https://r.com",
+            ["Payments:Providers:HotPay:NotifyUrl"] = "https://n.com",
+        });
+        var configure = new HotPayConfigureOptions(cfg);
+        var options = new HotPayServiceOptions();
+        configure.Configure(options);
+        Assert.Equal("hotpay_sec", options.SecretHash);
+        Assert.Equal("https://platnosci.hotpay.pl", options.ServiceUrl);
+    }
+
+    [Fact]
+    public void HotPayConfigureOptions_Configure_NullSection_DoesNotThrow()
+    {
+        var cfg = BuildConfig(new Dictionary<string, string?>());
+        new HotPayConfigureOptions(cfg).Configure(new HotPayServiceOptions());
+    }
+
+    [Fact]
+    public void Przelewy24ConfigureOptions_Configure_SetsAllValues()
+    {
+        var cfg = BuildConfig(new Dictionary<string, string?>
+        {
+            ["Payments:Providers:Przelewy24:MerchantId"] = "12345",
+            ["Payments:Providers:Przelewy24:PosId"] = "12345",
+            ["Payments:Providers:Przelewy24:ApiKey"] = "p24_api",
+            ["Payments:Providers:Przelewy24:CrcKey"] = "p24_crc",
+            ["Payments:Providers:Przelewy24:ServiceUrl"] = "https://secure.przelewy24.pl",
+            ["Payments:Providers:Przelewy24:ReturnUrl"] = "https://r.com",
+            ["Payments:Providers:Przelewy24:NotifyUrl"] = "https://n.com",
+        });
+        var configure = new Przelewy24ConfigureOptions(cfg);
+        var options = new Przelewy24ServiceOptions();
+        configure.Configure(options);
+        Assert.Equal(12345, options.MerchantId);
+        Assert.Equal("p24_api", options.ApiKey);
+        Assert.Equal("p24_crc", options.CrcKey);
+    }
+
+    [Fact]
+    public void Przelewy24ConfigureOptions_Configure_NullSection_DoesNotThrow()
+    {
+        var cfg = BuildConfig(new Dictionary<string, string?>());
+        new Przelewy24ConfigureOptions(cfg).Configure(new Przelewy24ServiceOptions());
+    }
+}
diff --git a/tests/TailoredApps.Shared.Payments.Tests/ServiceCallerUnitTests.cs b/tests/TailoredApps.Shared.Payments.Tests/ServiceCallerUnitTests.cs
index 0772dcb..ee3e765 100644
--- a/tests/TailoredApps.Shared.Payments.Tests/ServiceCallerUnitTests.cs
+++ b/tests/TailoredApps.Shared.Payments.Tests/ServiceCallerUnitTests.cs
@@ -1,510 +1,510 @@
-using System;
-using System.Net.Http;
-using System.Security.Cryptography;
-using System.Text;
-using System.Text.Json;
-using Microsoft.Extensions.Options;
-using Moq;
-using TailoredApps.Shared.Payments.Provider.Adyen;
-using TailoredApps.Shared.Payments.Provider.HotPay;
-using TailoredApps.Shared.Payments.Provider.PayNow;
-using TailoredApps.Shared.Payments.Provider.PayU;
-using TailoredApps.Shared.Payments.Provider.Przelewy24;
-using TailoredApps.Shared.Payments.Provider.Revolut;
-using TailoredApps.Shared.Payments.Provider.Tpay;
-using Xunit;
-
-namespace TailoredApps.Shared.Payments.Tests;
-
-// ─── Helpers ─────────────────────────────────────────────────────────────────
-
-file static class CallerHelper
-{
-    public static IHttpClientFactory DummyFactory()
-    {
-        var mock = new Mock<IHttpClientFactory>();
-        mock.Setup(f => f.CreateClient(It.IsAny<string>())).Returns(new HttpClient());
-        return mock.Object;
-    }
-}
-
-// ─── PayUServiceCaller ────────────────────────────────────────────────────────
-
-/// <summary>Unit testy dla PayUServiceCaller — czyste funkcje (bez HTTP).</summary>
-public class PayUServiceCallerTests
-{
-    private static PayUServiceCaller Build(string signatureKey) =>
-        new(Options.Create(new PayUServiceOptions
-        {
-            SignatureKey = signatureKey,
-            ServiceUrl   = "https://secure.snd.payu.com",
-        }), CallerHelper.DummyFactory());
-
-    [Fact]
-    public void VerifySignature_MD5_Valid()
-    {
-        const string body = "{\"order\":{\"status\":\"COMPLETED\"}}";
-        const string key  = "test_sig_key";
-        var caller = Build(key);
-        var hash = Convert.ToHexString(MD5.HashData(Encoding.UTF8.GetBytes(body + key))).ToLowerInvariant();
-        var sig  = $"sender=checkout;signature={hash};algorithm=MD5;content=DOCUMENT";
-        Assert.True(caller.VerifySignature(body, sig));
-    }
-
-    [Fact]
-    public void VerifySignature_SHA256_Valid()
-    {
-        const string body = "{\"order\":{\"status\":\"COMPLETED\"}}";
-        const string key  = "test_sig_key";
-        var caller = Build(key);
-        var hash = Convert.ToHexString(SHA256.HashData(Encoding.UTF8.GetBytes(body + key))).ToLowerInvariant();
-        var sig  = $"sender=checkout;signature={hash};algorithm=SHA256;content=DOCUMENT";
-        Assert.True(caller.VerifySignature(body, sig));
-    }
-
-    [Fact]
-    public void VerifySignature_SHA_256_Alias_Valid()
-    {
-        const string body = "{\"data\":\"test\"}";
-        const string key  = "key123";
-        var caller = Build(key);
-        var hash = Convert.ToHexString(SHA256.HashData(Encoding.UTF8.GetBytes(body + key))).ToLowerInvariant();
-        var sig  = $"sender=checkout;signature={hash};algorithm=SHA-256;content=DOCUMENT";
-        Assert.True(caller.VerifySignature(body, sig));
-    }
-
-    [Fact]
-    public void VerifySignature_WrongHash_ReturnsFalse()
-    {
-        var caller = Build("correct_key");
-        var sig = "sender=checkout;signature=deadbeef00000000000000000000000000000000;algorithm=MD5;content=DOCUMENT";
-        Assert.False(caller.VerifySignature("{}", sig));
-    }
-
-    [Fact]
-    public void VerifySignature_MissingSignaturePart_ReturnsFalse()
-    {
-        var caller = Build("key");
-        Assert.False(caller.VerifySignature("{}", "sender=checkout;algorithm=MD5"));
-    }
-
-    [Fact]
-    public void VerifySignature_EmptyString_ReturnsFalse()
-    {
-        var caller = Build("key");
-        Assert.False(caller.VerifySignature("{}", ""));
-    }
-}
-
-// ─── HotPayServiceCaller ──────────────────────────────────────────────────────
-
-/// <summary>Unit testy dla HotPayServiceCaller — czyste funkcje (bez HTTP).</summary>
-public class HotPayServiceCallerTests
-{
-    private static HotPayServiceCaller Build(string secretHash) =>
-        new(Options.Create(new HotPayServiceOptions
-        {
-            SecretHash = secretHash,
-            ServiceUrl = "https://platnosci.hotpay.pl",
-            ReturnUrl  = "https://example.com/return",
-        }), CallerHelper.DummyFactory());
-
-    [Fact]
-    public void VerifyNotification_ValidHash_ReturnsTrue()
-    {
-        const string secret = "hotpay_secret";
-        var caller = Build(secret);
-        const string kwota = "9.99";
-        const string id    = "pay_123";
-        const string status = "SUCCESS";
-        var data = $"{secret};{kwota};{id};{status}";
-        var hash = Convert.ToHexString(SHA256.HashData(Encoding.UTF8.GetBytes(data))).ToLowerInvariant();
-        Assert.True(caller.VerifyNotification(hash, kwota, id, status));
-    }
-
-    [Fact]
-    public void VerifyNotification_InvalidHash_ReturnsFalse()
-    {
-        var caller = Build("secret");
-        Assert.False(caller.VerifyNotification("badhash", "9.99", "pay_1", "SUCCESS"));
-    }
-
-    [Fact]
-    public void VerifyNotification_WrongSecret_ReturnsFalse()
-    {
-        var caller = Build("wrong_secret");
-        const string data = "correct_secret;9.99;pay_1;SUCCESS";
-        var hash = Convert.ToHexString(SHA256.HashData(Encoding.UTF8.GetBytes(data))).ToLowerInvariant();
-        Assert.False(caller.VerifyNotification(hash, "9.99", "pay_1", "SUCCESS"));
-    }
-
-    [Fact]
-    public void VerifyNotification_DifferentStatus_HashMismatch_ReturnsFalse()
-    {
-        const string secret = "sec";
-        var caller = Build(secret);
-        var correctData = $"{secret};10.00;id1;SUCCESS";
-        var hash = Convert.ToHexString(SHA256.HashData(Encoding.UTF8.GetBytes(correctData))).ToLowerInvariant();
-        Assert.False(caller.VerifyNotification(hash, "10.00", "id1", "FAILURE"));
-    }
-}
-
-// ─── PayNowServiceCaller ──────────────────────────────────────────────────────
-
-/// <summary>Unit testy dla PayNowServiceCaller — czyste funkcje (bez HTTP).</summary>
-public class PayNowServiceCallerTests
-{
-    private static PayNowServiceCaller Build(string sigKey) =>
-        new(Options.Create(new PayNowServiceOptions
-        {
-            SignatureKey = sigKey,
-            ApiKey       = "api_key",
-            ServiceUrl   = "https://api.sandbox.paynow.pl",
-        }), CallerHelper.DummyFactory());
-
-    [Fact]
-    public void VerifySignature_ValidHmac_ReturnsTrue()
-    {
-        const string key  = "paynow_sig_key";
-        const string body = "{\"paymentId\":\"pn_1\",\"status\":\"CONFIRMED\"}";
-        var caller = Build(key);
-        var computed = Convert.ToBase64String(HMACSHA256.HashData(
-            Encoding.UTF8.GetBytes(key),
-            Encoding.UTF8.GetBytes(body)));
-        Assert.True(caller.VerifySignature(body, computed));
-    }
-
-    [Fact]
-    public void VerifySignature_InvalidHmac_ReturnsFalse()
-    {
-        var caller = Build("key123");
-        Assert.False(caller.VerifySignature("{}", "invalidsig=="));
-    }
-
-    [Fact]
-    public void VerifySignature_EmptySignature_ReturnsFalse()
-    {
-        var caller = Build("key");
-        Assert.False(caller.VerifySignature("{}", ""));
-    }
-
-    [Fact]
-    public void VerifySignature_WrongKey_ReturnsFalse()
-    {
-        const string body = "{\"data\":\"test\"}";
-        var callerCorrect = Build("correct_key");
-        var hmac = Convert.ToBase64String(HMACSHA256.HashData(
-            Encoding.UTF8.GetBytes("correct_key"),
-            Encoding.UTF8.GetBytes(body)));
-        var callerWrong = Build("wrong_key");
-        Assert.False(callerWrong.VerifySignature(body, hmac));
-    }
-}
-
-// ─── RevolutServiceCaller ─────────────────────────────────────────────────────
-
-/// <summary>Unit testy dla RevolutServiceCaller — czyste funkcje (bez HTTP).</summary>
-public class RevolutServiceCallerTests
-{
-    private static RevolutServiceCaller Build(string webhookSecret) =>
-        new(Options.Create(new RevolutServiceOptions
-        {
-            WebhookSecret = webhookSecret,
-            ApiKey        = "sk_sandbox",
-            ApiUrl        = "https://sandbox-merchant.revolut.com/api",
-        }), CallerHelper.DummyFactory());
-
-    private static string ComputeRevolutSig(string secret, string timestamp, string payload)
-    {
-        var signed = $"v1:{timestamp}.{payload}";
-        var hex = Convert.ToHexString(HMACSHA256.HashData(
-            Encoding.UTF8.GetBytes(secret),
-            Encoding.UTF8.GetBytes(signed))).ToLowerInvariant();
-        return $"v1={hex}";
-    }
-
-    [Fact]
-    public void VerifyWebhookSignature_Valid_ReturnsTrue()
-    {
-        const string secret = "revolut_webhook_secret";
-        const string ts     = "1711234567";
-        const string body   = "{\"event\":\"ORDER_COMPLETED\"}";
-        var sig = ComputeRevolutSig(secret, ts, body);
-        var caller = Build(secret);
-        Assert.True(caller.VerifyWebhookSignature(body, ts, sig));
-    }
-
-    [Fact]
-    public void VerifyWebhookSignature_WrongTimestamp_ReturnsFalse()
-    {
-        const string secret = "revolut_webhook_secret";
-        const string body   = "{\"event\":\"ORDER_COMPLETED\"}";
-        var sig = ComputeRevolutSig(secret, "1111111111", body);
-        var caller = Build(secret);
-        Assert.False(caller.VerifyWebhookSignature(body, "9999999999", sig));
-    }
-
-    [Fact]
-    public void VerifyWebhookSignature_InvalidSignature_ReturnsFalse()
-    {
-        var caller = Build("secret");
-        Assert.False(caller.VerifyWebhookSignature("{}", "123", "v1=badhex"));
-    }
-
-    [Fact]
-    public void VerifyWebhookSignature_NoV1Prefix_StillVerifies()
-    {
-        const string secret = "sec";
-        const string ts     = "12345";
-        const string body   = "{\"test\":1}";
-        var signed = $"v1:{ts}.{body}";
-        var hex = Convert.ToHexString(HMACSHA256.HashData(
-            Encoding.UTF8.GetBytes(secret),
-            Encoding.UTF8.GetBytes(signed))).ToLowerInvariant();
-        // Without v1= prefix
-        var caller = Build(secret);
-        Assert.True(caller.VerifyWebhookSignature(body, ts, hex));
-    }
-
-    [Fact]
-    public void VerifyWebhookSignature_WrongSecret_ReturnsFalse()
-    {
-        const string ts   = "1234";
-        const string body = "{\"ev\":\"x\"}";
-        var sig = ComputeRevolutSig("correct_secret", ts, body);
-        var caller = Build("wrong_secret");
-        Assert.False(caller.VerifyWebhookSignature(body, ts, sig));
-    }
-}
-
-// ─── AdyenServiceCaller ───────────────────────────────────────────────────────
-
-/// <summary>Unit testy dla AdyenServiceCaller — czyste funkcje (bez HTTP).</summary>
-public class AdyenServiceCallerTests
-{
-    private static AdyenServiceCaller Build(string hmacKeyHex) =>
-        new(Options.Create(new AdyenServiceOptions
-        {
-            ApiKey              = "AQE...",
-            MerchantAccount     = "TestMerchant",
-            NotificationHmacKey = hmacKeyHex,
-            CheckoutUrl         = "https://checkout-test.adyen.com/v71",
-            Environment         = "test",
-        }), CallerHelper.DummyFactory());
-
-    private static (string hex, string b64) ComputeAdyenHmac(string hexKey, string payload)
-    {
-        var keyBytes  = Convert.FromHexString(hexKey);
-        var dataBytes = Encoding.UTF8.GetBytes(payload);
-        var raw       = HMACSHA256.HashData(keyBytes, dataBytes);
-        return (Convert.ToHexString(raw).ToLowerInvariant(), Convert.ToBase64String(raw));
-    }
-
-    [Fact]
-    public void VerifyNotificationHmac_Valid_ReturnsTrue()
-    {
-        const string hexKey  = "4142434445464748494a4b4c4d4e4f50"; // 16 bytes
-        const string payload = "{\"notif\":\"test\"}";
-        var (_, b64) = ComputeAdyenHmac(hexKey, payload);
-        var caller = Build(hexKey);
-        Assert.True(caller.VerifyNotificationHmac(payload, b64));
-    }
-
-    [Fact]
-    public void VerifyNotificationHmac_InvalidSig_ReturnsFalse()
-    {
-        var caller = Build("4142434445464748494a4b4c4d4e4f50");
-        Assert.False(caller.VerifyNotificationHmac("{}", "badsignature=="));
-    }
-
-    [Fact]
-    public void VerifyNotificationHmac_InvalidHexKey_ReturnsFalse()
-    {
-        var caller = Build("not-valid-hex!");
-        Assert.False(caller.VerifyNotificationHmac("{}", "anything=="));
-    }
-
-    [Fact]
-    public void VerifyNotificationHmac_WrongKey_ReturnsFalse()
-    {
-        const string payload = "{\"data\":\"abc\"}";
-        var (_, b64) = ComputeAdyenHmac("4142434445464748494a4b4c4d4e4f50", payload);
-        var caller   = Build("5152535455565758595a5b5c5d5e5f60"); // different key
-        Assert.False(caller.VerifyNotificationHmac(payload, b64));
-    }
-
-    [Fact]
-    public void VerifyNotificationHmac_DifferentPayload_ReturnsFalse()
-    {
-        const string hexKey   = "4142434445464748494a4b4c4d4e4f50";
-        var (_, b64) = ComputeAdyenHmac(hexKey, "{\"original\":true}");
-        var caller   = Build(hexKey);
-        Assert.False(caller.VerifyNotificationHmac("{\"tampered\":true}", b64));
-    }
-}
-
-// ─── TpayServiceCaller ────────────────────────────────────────────────────────
-
-/// <summary>Unit testy dla TpayServiceCaller — czyste funkcje (bez HTTP).</summary>
-public class TpayServiceCallerTests
-{
-    private static TpayServiceCaller Build(string securityCode) =>
-        new(Options.Create(new TpayServiceOptions
-        {
-            SecurityCode = securityCode,
-            ClientId     = "client_1",
-            ClientSecret = "secret",
-            ServiceUrl   = "https://openapi.sandbox.tpay.com",
-        }), CallerHelper.DummyFactory());
-
-    [Fact]
-    public void VerifyNotification_ValidSig_ReturnsTrue()
-    {
-        const string code = "tpay_security";
-        const string body = "{\"id\":\"txn_1\",\"status\":\"paid\"}";
-        var caller  = Build(code);
-        var hash    = Convert.ToHexString(SHA256.HashData(Encoding.UTF8.GetBytes(body + code))).ToLowerInvariant();
-        Assert.True(caller.VerifyNotification(body, hash));
-    }
-
-    [Fact]
-    public void VerifyNotification_InvalidSig_ReturnsFalse()
-    {
-        var caller = Build("tpay_sec");
-        Assert.False(caller.VerifyNotification("{}", "badsig"));
-    }
-
-    [Fact]
-    public void VerifyNotification_WrongCode_ReturnsFalse()
-    {
-        const string body = "{\"status\":\"paid\"}";
-        var hash = Convert.ToHexString(SHA256.HashData(Encoding.UTF8.GetBytes(body + "correct_code"))).ToLowerInvariant();
-        var caller = Build("wrong_code");
-        Assert.False(caller.VerifyNotification(body, hash));
-    }
-
-    [Fact]
-    public void VerifyNotification_EmptySig_ReturnsFalse()
-    {
-        var caller = Build("code");
-        Assert.False(caller.VerifyNotification("{}", ""));
-    }
-}
-
-// ─── Przelewy24ServiceCaller ──────────────────────────────────────────────────
-
-/// <summary>Unit testy dla Przelewy24ServiceCaller — czyste funkcje (bez HTTP).</summary>
-public class Przelewy24ServiceCallerTests
-{
-    private static Przelewy24ServiceCaller Build(string crcKey, int merchantId = 12345) =>
-        new(Options.Create(new Przelewy24ServiceOptions
-        {
-            CrcKey     = crcKey,
-            MerchantId = merchantId,
-            PosId      = merchantId,
-            ApiKey     = "api_key",
-            ServiceUrl = "https://sandbox.przelewy24.pl",
-            NotifyUrl  = "https://example.com/notify",
-            ReturnUrl  = "https://example.com/return",
-        }), CallerHelper.DummyFactory());
-
-    private static string ComputeP24Sign(string sessionId, int merchantId, long amount, string currency, string crcKey)
-    {
-        var json = JsonSerializer.Serialize(new
-        {
-            sessionId,
-            merchantId,
-            amount,
-            currency,
-            crc = crcKey,
-        });
-        return Convert.ToHexString(SHA384.HashData(Encoding.UTF8.GetBytes(json))).ToLowerInvariant();
-    }
-
-    [Fact]
-    public void ComputeSign_ReturnsCorrectSHA384()
-    {
-        const string crc = "p24_crc_key";
-        var caller  = Build(crc, 12345);
-        var sign    = caller.ComputeSign("sess_1", 12345, 999, "PLN");
-        var expected = ComputeP24Sign("sess_1", 12345, 999, "PLN", crc);
-        Assert.Equal(expected, sign);
-    }
-
-    [Fact]
-    public void ComputeSign_DifferentInputs_DifferentSigns()
-    {
-        const string crc = "crc";
-        var caller = Build(crc);
-        var s1 = caller.ComputeSign("sess_1", 12345, 999, "PLN");
-        var s2 = caller.ComputeSign("sess_2", 12345, 999, "PLN");
-        Assert.NotEqual(s1, s2);
-    }
-
-    [Fact]
-    public void VerifyNotification_ValidSign_ReturnsTrue()
-    {
-        const string crc      = "p24crc";
-        const int    merchant = 12345;
-        var caller = Build(crc, merchant);
-
-        const string sessionId = "test_sess";
-        const int    orderId   = 99;
-        const long   amount    = 1000L;
-        const string currency  = "PLN";
-
-        var json = JsonSerializer.Serialize(new
-        {
-            sessionId,
-            orderId,
-            merchantId = merchant,
-            amount,
-            currency,
-            crc,
-        });
-        var sign = Convert.ToHexString(SHA384.HashData(Encoding.UTF8.GetBytes(json))).ToLowerInvariant();
-
-        var body = JsonSerializer.Serialize(new
-        {
-            sessionId,
-            orderId,
-            merchantId = merchant,
-            amount,
-            currency,
-            sign,
-        });
-
-        Assert.True(caller.VerifyNotification(body));
-    }
-
-    [Fact]
-    public void VerifyNotification_WrongSign_ReturnsFalse()
-    {
-        var caller = Build("crc");
-        var body   = JsonSerializer.Serialize(new
-        {
-            sessionId  = "s",
-            orderId    = 1,
-            merchantId = 12345,
-            amount     = 100L,
-            currency   = "PLN",
-            sign       = "wrongsignature",
-        });
-        Assert.False(caller.VerifyNotification(body));
-    }
-
-    [Fact]
-    public void VerifyNotification_MissingSign_ReturnsFalse()
-    {
-        var caller = Build("crc");
-        var body = JsonSerializer.Serialize(new { sessionId = "s", orderId = 1 });
-        Assert.False(caller.VerifyNotification(body));
-    }
-
-    [Fact]
-    public void VerifyNotification_MalformedJson_ReturnsFalse()
-    {
-        var caller = Build("crc");
-        Assert.False(caller.VerifyNotification("not-json-at-all"));
-    }
-}
+using System;
+using System.Net.Http;
+using System.Security.Cryptography;
+using System.Text;
+using System.Text.Json;
+using Microsoft.Extensions.Options;
+using Moq;
+using TailoredApps.Shared.Payments.Provider.Adyen;
+using TailoredApps.Shared.Payments.Provider.HotPay;
+using TailoredApps.Shared.Payments.Provider.PayNow;
+using TailoredApps.Shared.Payments.Provider.PayU;
+using TailoredApps.Shared.Payments.Provider.Przelewy24;
+using TailoredApps.Shared.Payments.Provider.Revolut;
+using TailoredApps.Shared.Payments.Provider.Tpay;
+using Xunit;
+
+namespace TailoredApps.Shared.Payments.Tests;
+
+// ─── Helpers ─────────────────────────────────────────────────────────────────
+
+file static class CallerHelper
+{
+    public static IHttpClientFactory DummyFactory()
+    {
+        var mock = new Mock<IHttpClientFactory>();
+        mock.Setup(f => f.CreateClient(It.IsAny<string>())).Returns(new HttpClient());
+        return mock.Object;
+    }
+}
+
+// ─── PayUServiceCaller ────────────────────────────────────────────────────────
+
+/// <summary>Unit testy dla PayUServiceCaller — czyste funkcje (bez HTTP).</summary>
+public class PayUServiceCallerTests
+{
+    private static PayUServiceCaller Build(string signatureKey) =>
+        new(Options.Create(new PayUServiceOptions
+        {
+            SignatureKey = signatureKey,
+            ServiceUrl = "https://secure.snd.payu.com",
+        }), CallerHelper.DummyFactory());
+
+    [Fact]
+    public void VerifySignature_MD5_Valid()
+    {
+        const string body = "{\"order\":{\"status\":\"COMPLETED\"}}";
+        const string key = "test_sig_key";
+        var caller = Build(key);
+        var hash = Convert.ToHexString(MD5.HashData(Encoding.UTF8.GetBytes(body + key))).ToLowerInvariant();
+        var sig = $"sender=checkout;signature={hash};algorithm=MD5;content=DOCUMENT";
+        Assert.True(caller.VerifySignature(body, sig));
+    }
+
+    [Fact]
+    public void VerifySignature_SHA256_Valid()
+    {
+        const string body = "{\"order\":{\"status\":\"COMPLETED\"}}";
+        const string key = "test_sig_key";
+        var caller = Build(key);
+        var hash = Convert.ToHexString(SHA256.HashData(Encoding.UTF8.GetBytes(body + key))).ToLowerInvariant();
+        var sig = $"sender=checkout;signature={hash};algorithm=SHA256;content=DOCUMENT";
+        Assert.True(caller.VerifySignature(body, sig));
+    }
+
+    [Fact]
+    public void VerifySignature_SHA_256_Alias_Valid()
+    {
+        const string body = "{\"data\":\"test\"}";
+        const string key = "key123";
+        var caller = Build(key);
+        var hash = Convert.ToHexString(SHA256.HashData(Encoding.UTF8.GetBytes(body + key))).ToLowerInvariant();
+        var sig = $"sender=checkout;signature={hash};algorithm=SHA-256;content=DOCUMENT";
+        Assert.True(caller.VerifySignature(body, sig));
+    }
+
+    [Fact]
+    public void VerifySignature_WrongHash_ReturnsFalse()
+    {
+        var caller = Build("correct_key");
+        var sig = "sender=checkout;signature=deadbeef00000000000000000000000000000000;algorithm=MD5;content=DOCUMENT";
+        Assert.False(caller.VerifySignature("{}", sig));
+    }
+
+    [Fact]
+    public void VerifySignature_MissingSignaturePart_ReturnsFalse()
+    {
+        var caller = Build("key");
+        Assert.False(caller.VerifySignature("{}", "sender=checkout;algorithm=MD5"));
+    }
+
+    [Fact]
+    public void VerifySignature_EmptyString_ReturnsFalse()
+    {
+        var caller = Build("key");
+        Assert.False(caller.VerifySignature("{}", ""));
+    }
+}
+
+// ─── HotPayServiceCaller ──────────────────────────────────────────────────────
+
+/// <summary>Unit testy dla HotPayServiceCaller — czyste funkcje (bez HTTP).</summary>
+public class HotPayServiceCallerTests
+{
+    private static HotPayServiceCaller Build(string secretHash) =>
+        new(Options.Create(new HotPayServiceOptions
+        {
+            SecretHash = secretHash,
+            ServiceUrl = "https://platnosci.hotpay.pl",
+            ReturnUrl = "https://example.com/return",
+        }), CallerHelper.DummyFactory());
+
+    [Fact]
+    public void VerifyNotification_ValidHash_ReturnsTrue()
+    {
+        const string secret = "hotpay_secret";
+        var caller = Build(secret);
+        const string kwota = "9.99";
+        const string id = "pay_123";
+        const string status = "SUCCESS";
+        var data = $"{secret};{kwota};{id};{status}";
+        var hash = Convert.ToHexString(SHA256.HashData(Encoding.UTF8.GetBytes(data))).ToLowerInvariant();
+        Assert.True(caller.VerifyNotification(hash, kwota, id, status));
+    }
+
+    [Fact]
+    public void VerifyNotification_InvalidHash_ReturnsFalse()
+    {
+        var caller = Build("secret");
+        Assert.False(caller.VerifyNotification("badhash", "9.99", "pay_1", "SUCCESS"));
+    }
+
+    [Fact]
+    public void VerifyNotification_WrongSecret_ReturnsFalse()
+    {
+        var caller = Build("wrong_secret");
+        const string data = "correct_secret;9.99;pay_1;SUCCESS";
+        var hash = Convert.ToHexString(SHA256.HashData(Encoding.UTF8.GetBytes(data))).ToLowerInvariant();
+        Assert.False(caller.VerifyNotification(hash, "9.99", "pay_1", "SUCCESS"));
+    }
+
+    [Fact]
+    public void VerifyNotification_DifferentStatus_HashMismatch_ReturnsFalse()
+    {
+        const string secret = "sec";
+        var caller = Build(secret);
+        var correctData = $"{secret};10.00;id1;SUCCESS";
+        var hash = Convert.ToHexString(SHA256.HashData(Encoding.UTF8.GetBytes(correctData))).ToLowerInvariant();
+        Assert.False(caller.VerifyNotification(hash, "10.00", "id1", "FAILURE"));
+    }
+}
+
+// ─── PayNowServiceCaller ──────────────────────────────────────────────────────
+
+/// <summary>Unit testy dla PayNowServiceCaller — czyste funkcje (bez HTTP).</summary>
+public class PayNowServiceCallerTests
+{
+    private static PayNowServiceCaller Build(string sigKey) =>
+        new(Options.Create(new PayNowServiceOptions
+        {
+            SignatureKey = sigKey,
+            ApiKey = "api_key",
+            ServiceUrl = "https://api.sandbox.paynow.pl",
+        }), CallerHelper.DummyFactory());
+
+    [Fact]
+    public void VerifySignature_ValidHmac_ReturnsTrue()
+    {
+        const string key = "paynow_sig_key";
+        const string body = "{\"paymentId\":\"pn_1\",\"status\":\"CONFIRMED\"}";
+        var caller = Build(key);
+        var computed = Convert.ToBase64String(HMACSHA256.HashData(
+            Encoding.UTF8.GetBytes(key),
+            Encoding.UTF8.GetBytes(body)));
+        Assert.True(caller.VerifySignature(body, computed));
+    }
+
+    [Fact]
+    public void VerifySignature_InvalidHmac_ReturnsFalse()
+    {
+        var caller = Build("key123");
+        Assert.False(caller.VerifySignature("{}", "invalidsig=="));
+    }
+
+    [Fact]
+    public void VerifySignature_EmptySignature_ReturnsFalse()
+    {
+        var caller = Build("key");
+        Assert.False(caller.VerifySignature("{}", ""));
+    }
+
+    [Fact]
+    public void VerifySignature_WrongKey_ReturnsFalse()
+    {
+        const string body = "{\"data\":\"test\"}";
+        var callerCorrect = Build("correct_key");
+        var hmac = Convert.ToBase64String(HMACSHA256.HashData(
+            Encoding.UTF8.GetBytes("correct_key"),
+            Encoding.UTF8.GetBytes(body)));
+        var callerWrong = Build("wrong_key");
+        Assert.False(callerWrong.VerifySignature(body, hmac));
+    }
+}
+
+// ─── RevolutServiceCaller ─────────────────────────────────────────────────────
+
+/// <summary>Unit testy dla RevolutServiceCaller — czyste funkcje (bez HTTP).</summary>
+public class RevolutServiceCallerTests
+{
+    private static RevolutServiceCaller Build(string webhookSecret) =>
+        new(Options.Create(new RevolutServiceOptions
+        {
+            WebhookSecret = webhookSecret,
+            ApiKey = "sk_sandbox",
+            ApiUrl = "https://sandbox-merchant.revolut.com/api",
+        }), CallerHelper.DummyFactory());
+
+    private static string ComputeRevolutSig(string secret, string timestamp, string payload)
+    {
+        var signed = $"v1:{timestamp}.{payload}";
+        var hex = Convert.ToHexString(HMACSHA256.HashData(
+            Encoding.UTF8.GetBytes(secret),
+            Encoding.UTF8.GetBytes(signed))).ToLowerInvariant();
+        return $"v1={hex}";
+    }
+
+    [Fact]
+    public void VerifyWebhookSignature_Valid_ReturnsTrue()
+    {
+        const string secret = "revolut_webhook_secret";
+        const string ts = "1711234567";
+        const string body = "{\"event\":\"ORDER_COMPLETED\"}";
+        var sig = ComputeRevolutSig(secret, ts, body);
+        var caller = Build(secret);
+        Assert.True(caller.VerifyWebhookSignature(body, ts, sig));
+    }
+
+    [Fact]
+    public void VerifyWebhookSignature_WrongTimestamp_ReturnsFalse()
+    {
+        const string secret = "revolut_webhook_secret";
+        const string body = "{\"event\":\"ORDER_COMPLETED\"}";
+        var sig = ComputeRevolutSig(secret, "1111111111", body);
+        var caller = Build(secret);
+        Assert.False(caller.VerifyWebhookSignature(body, "9999999999", sig));
+    }
+
+    [Fact]
+    public void VerifyWebhookSignature_InvalidSignature_ReturnsFalse()
+    {
+        var caller = Build("secret");
+        Assert.False(caller.VerifyWebhookSignature("{}", "123", "v1=badhex"));
+    }
+
+    [Fact]
+    public void VerifyWebhookSignature_NoV1Prefix_StillVerifies()
+    {
+        const string secret = "sec";
+        const string ts = "12345";
+        const string body = "{\"test\":1}";
+        var signed = $"v1:{ts}.{body}";
+        var hex = Convert.ToHexString(HMACSHA256.HashData(
+            Encoding.UTF8.GetBytes(secret),
+            Encoding.UTF8.GetBytes(signed))).ToLowerInvariant();
+        // Without v1= prefix
+        var caller = Build(secret);
+        Assert.True(caller.VerifyWebhookSignature(body, ts, hex));
+    }
+
+    [Fact]
+    public void VerifyWebhookSignature_WrongSecret_ReturnsFalse()
+    {
+        const string ts = "1234";
+        const string body = "{\"ev\":\"x\"}";
+        var sig = ComputeRevolutSig("correct_secret", ts, body);
+        var caller = Build("wrong_secret");
+        Assert.False(caller.VerifyWebhookSignature(body, ts, sig));
+    }
+}
+
+// ─── AdyenServiceCaller ───────────────────────────────────────────────────────
+
+/// <summary>Unit testy dla AdyenServiceCaller — czyste funkcje (bez HTTP).</summary>
+public class AdyenServiceCallerTests
+{
+    private static AdyenServiceCaller Build(string hmacKeyHex) =>
+        new(Options.Create(new AdyenServiceOptions
+        {
+            ApiKey = "AQE...",
+            MerchantAccount = "TestMerchant",
+            NotificationHmacKey = hmacKeyHex,
+            CheckoutUrl = "https://checkout-test.adyen.com/v71",
+            Environment = "test",
+        }), CallerHelper.DummyFactory());
+
+    private static (string hex, string b64) ComputeAdyenHmac(string hexKey, string payload)
+    {
+        var keyBytes = Convert.FromHexString(hexKey);
+        var dataBytes = Encoding.UTF8.GetBytes(payload);
+        var raw = HMACSHA256.HashData(keyBytes, dataBytes);
+        return (Convert.ToHexString(raw).ToLowerInvariant(), Convert.ToBase64String(raw));
+    }
+
+    [Fact]
+    public void VerifyNotificationHmac_Valid_ReturnsTrue()
+    {
+        const string hexKey = "4142434445464748494a4b4c4d4e4f50"; // 16 bytes
+        const string payload = "{\"notif\":\"test\"}";
+        var (_, b64) = ComputeAdyenHmac(hexKey, payload);
+        var caller = Build(hexKey);
+        Assert.True(caller.VerifyNotificationHmac(payload, b64));
+    }
+
+    [Fact]
+    public void VerifyNotificationHmac_InvalidSig_ReturnsFalse()
+    {
+        var caller = Build("4142434445464748494a4b4c4d4e4f50");
+        Assert.False(caller.VerifyNotificationHmac("{}", "badsignature=="));
+    }
+
+    [Fact]
+    public void VerifyNotificationHmac_InvalidHexKey_ReturnsFalse()
+    {
+        var caller = Build("not-valid-hex!");
+        Assert.False(caller.VerifyNotificationHmac("{}", "anything=="));
+    }
+
+    [Fact]
+    public void VerifyNotificationHmac_WrongKey_ReturnsFalse()
+    {
+        const string payload = "{\"data\":\"abc\"}";
+        var (_, b64) = ComputeAdyenHmac("4142434445464748494a4b4c4d4e4f50", payload);
+        var caller = Build("5152535455565758595a5b5c5d5e5f60"); // different key
+        Assert.False(caller.VerifyNotificationHmac(payload, b64));
+    }
+
+    [Fact]
+    public void VerifyNotificationHmac_DifferentPayload_ReturnsFalse()
+    {
+        const string hexKey = "4142434445464748494a4b4c4d4e4f50";
+        var (_, b64) = ComputeAdyenHmac(hexKey, "{\"original\":true}");
+        var caller = Build(hexKey);
+        Assert.False(caller.VerifyNotificationHmac("{\"tampered\":true}", b64));
+    }
+}
+
+// ─── TpayServiceCaller ────────────────────────────────────────────────────────
+
+/// <summary>Unit testy dla TpayServiceCaller — czyste funkcje (bez HTTP).</summary>
+public class TpayServiceCallerTests
+{
+    private static TpayServiceCaller Build(string securityCode) =>
+        new(Options.Create(new TpayServiceOptions
+        {
+            SecurityCode = securityCode,
+            ClientId = "client_1",
+            ClientSecret = "secret",
+            ServiceUrl = "https://openapi.sandbox.tpay.com",
+        }), CallerHelper.DummyFactory());
+
+    [Fact]
+    public void VerifyNotification_ValidSig_ReturnsTrue()
+    {
+        const string code = "tpay_security";
+        const string body = "{\"id\":\"txn_1\",\"status\":\"paid\"}";
+        var caller = Build(code);
+        var hash = Convert.ToHexString(SHA256.HashData(Encoding.UTF8.GetBytes(body + code))).ToLowerInvariant();
+        Assert.True(caller.VerifyNotification(body, hash));
+    }
+
+    [Fact]
+    public void VerifyNotification_InvalidSig_ReturnsFalse()
+    {
+        var caller = Build("tpay_sec");
+        Assert.False(caller.VerifyNotification("{}", "badsig"));
+    }
+
+    [Fact]
+    public void VerifyNotification_WrongCode_ReturnsFalse()
+    {
+        const string body = "{\"status\":\"paid\"}";
+        var hash = Convert.ToHexString(SHA256.HashData(Encoding.UTF8.GetBytes(body + "correct_code"))).ToLowerInvariant();
+        var caller = Build("wrong_code");
+        Assert.False(caller.VerifyNotification(body, hash));
+    }
+
+    [Fact]
+    public void VerifyNotification_EmptySig_ReturnsFalse()
+    {
+        var caller = Build("code");
+        Assert.False(caller.VerifyNotification("{}", ""));
+    }
+}
+
+// ─── Przelewy24ServiceCaller ──────────────────────────────────────────────────
+
+/// <summary>Unit testy dla Przelewy24ServiceCaller — czyste funkcje (bez HTTP).</summary>
+public class Przelewy24ServiceCallerTests
+{
+    private static Przelewy24ServiceCaller Build(string crcKey, int merchantId = 12345) =>
+        new(Options.Create(new Przelewy24ServiceOptions
+        {
+            CrcKey = crcKey,
+            MerchantId = merchantId,
+            PosId = merchantId,
+            ApiKey = "api_key",
+            ServiceUrl = "https://sandbox.przelewy24.pl",
+            NotifyUrl = "https://example.com/notify",
+            ReturnUrl = "https://example.com/return",
+        }), CallerHelper.DummyFactory());
+
+    private static string ComputeP24Sign(string sessionId, int merchantId, long amount, string currency, string crcKey)
+    {
+        var json = JsonSerializer.Serialize(new
+        {
+            sessionId,
+            merchantId,
+            amount,
+            currency,
+            crc = crcKey,
+        });
+        return Convert.ToHexString(SHA384.HashData(Encoding.UTF8.GetBytes(json))).ToLowerInvariant();
+    }
+
+    [Fact]
+    public void ComputeSign_ReturnsCorrectSHA384()
+    {
+        const string crc = "p24_crc_key";
+        var caller = Build(crc, 12345);
+        var sign = caller.ComputeSign("sess_1", 12345, 999, "PLN");
+        var expected = ComputeP24Sign("sess_1", 12345, 999, "PLN", crc);
+        Assert.Equal(expected, sign);
+    }
+
+    [Fact]
+    public void ComputeSign_DifferentInputs_DifferentSigns()
+    {
+        const string crc = "crc";
+        var caller = Build(crc);
+        var s1 = caller.ComputeSign("sess_1", 12345, 999, "PLN");
+        var s2 = caller.ComputeSign("sess_2", 12345, 999, "PLN");
+        Assert.NotEqual(s1, s2);
+    }
+
+    [Fact]
+    public void VerifyNotification_ValidSign_ReturnsTrue()
+    {
+        const string crc = "p24crc";
+        const int merchant = 12345;
+        var caller = Build(crc, merchant);
+
+        const string sessionId = "test_sess";
+        const int orderId = 99;
+        const long amount = 1000L;
+        const string currency = "PLN";
+
+        var json = JsonSerializer.Serialize(new
+        {
+            sessionId,
+            orderId,
+            merchantId = merchant,
+            amount,
+            currency,
+            crc,
+        });
+        var sign = Convert.ToHexString(SHA384.HashData(Encoding.UTF8.GetBytes(json))).ToLowerInvariant();
+
+        var body = JsonSerializer.Serialize(new
+        {
+            sessionId,
+            orderId,
+            merchantId = merchant,
+            amount,
+            currency,
+            sign,
+        });
+
+        Assert.True(caller.VerifyNotification(body));
+    }
+
+    [Fact]
+    public void VerifyNotification_WrongSign_ReturnsFalse()
+    {
+        var caller = Build("crc");
+        var body = JsonSerializer.Serialize(new
+        {
+            sessionId = "s",
+            orderId = 1,
+            merchantId = 12345,
+            amount = 100L,
+            currency = "PLN",
+            sign = "wrongsignature",
+        });
+        Assert.False(caller.VerifyNotification(body));
+    }
+
+    [Fact]
+    public void VerifyNotification_MissingSign_ReturnsFalse()
+    {
+        var caller = Build("crc");
+        var body = JsonSerializer.Serialize(new { sessionId = "s", orderId = 1 });
+        Assert.False(caller.VerifyNotification(body));
+    }
+
+    [Fact]
+    public void VerifyNotification_MalformedJson_ReturnsFalse()
+    {
+        var caller = Build("crc");
+        Assert.False(caller.VerifyNotification("not-json-at-all"));
+    }
+}
diff --git a/tests/TailoredApps.Shared.Payments.Tests/StripePaymentTest.cs b/tests/TailoredApps.Shared.Payments.Tests/StripePaymentTest.cs
index 1bd736b..a31f261 100644
--- a/tests/TailoredApps.Shared.Payments.Tests/StripePaymentTest.cs
+++ b/tests/TailoredApps.Shared.Payments.Tests/StripePaymentTest.cs
@@ -1,181 +1,181 @@
-using System.Collections.Generic;
-using System.Threading.Tasks;
-using Microsoft.Extensions.Configuration;
-using Microsoft.Extensions.DependencyInjection;
-using Microsoft.Extensions.Hosting;
-using Microsoft.Extensions.Primitives;
-using TailoredApps.Shared.Payments;
-using TailoredApps.Shared.Payments.Provider.Stripe;
-using Xunit;
-
-namespace TailoredApps.Shared.Payments.Tests;
-
-/// <summary>
-/// Testy integracyjne providera Stripe.
-///
-/// Testy oznaczone <see cref="FactAttribute"/> bez [Trait] są uruchamiane zawsze.
-/// Testy wymagające połączenia ze Stripe (sk_test_...) są pomijane gdy klucz nie jest ustawiony.
-///
-/// Aby uruchomić testy integracyjne, ustaw zmienne środowiskowe:
-///   STRIPE_SECRET_KEY=sk_test_...
-///   STRIPE_WEBHOOK_SECRET=whsec_...
-/// lub wpisz wartości w appsettings.json (nie commituj kluczy produkcyjnych!).
-/// </summary>
-public class StripePaymentTest
-{
-    // ─── DI setup ────────────────────────────────────────────────────────────
-
-    private static IHost BuildHost() =>
-        Host.CreateDefaultBuilder()
-            .ConfigureAppConfiguration(cfg =>
-            {
-                cfg.AddJsonFile("appsettings.json", optional: true);
-                cfg.AddEnvironmentVariables("STRIPE_"); // STRIPE_SECRET_KEY, STRIPE_WEBHOOK_SECRET itp.
-            })
-            .ConfigureServices((_, services) =>
-            {
-                services.RegisterStripeProvider();
-                services.AddPayments()
-                    .RegisterPaymentProvider<StripeProvider>();
-            })
-            .Build();
-
-    // ─── Unit / smoke tests (nie wymagają połączenia) ────────────────────────
-
-    [Fact]
-    public async Task CanRequestPaymentProviders_IncludesStripe()
-    {
-        var host           = BuildHost();
-        var paymentService = host.Services.GetRequiredService<IPaymentService>();
-
-        var providers = await paymentService.GetProviders();
-
-        Assert.Contains(providers, p => p.Id == "Stripe");
-    }
-
-    [Fact]
-    public async Task GetChannels_Stripe_PLN_ReturnsBlikP24Card()
-    {
-        var host           = BuildHost();
-        var paymentService = host.Services.GetRequiredService<IPaymentService>();
-
-        var channels = await paymentService.GetChannels("Stripe", "PLN");
-
-        Assert.Contains(channels, c => c.Id == "card");
-        Assert.Contains(channels, c => c.Id == "blik");
-        Assert.Contains(channels, c => c.Id == "p24");
-    }
-
-    [Fact]
-    public async Task GetChannels_Stripe_EUR_ReturnsCardAndSepa()
-    {
-        var host           = BuildHost();
-        var paymentService = host.Services.GetRequiredService<IPaymentService>();
-
-        var channels = await paymentService.GetChannels("Stripe", "EUR");
-
-        Assert.Contains(channels, c => c.Id == "card");
-        Assert.Contains(channels, c => c.Id == "sepa_debit");
-    }
-
-    [Fact]
-    public async Task GetChannels_Stripe_USD_ReturnsOnlyCard()
-    {
-        var host           = BuildHost();
-        var paymentService = host.Services.GetRequiredService<IPaymentService>();
-
-        var channels = await paymentService.GetChannels("Stripe", "USD");
-
-        Assert.Single(channels, c => c.Id == "card");
-    }
-
-    /// <summary>
-    /// Webhook z nieprawidłowym podpisem zwraca Rejected (nie rzuca wyjątku na zewnątrz).
-    /// </summary>
-    [Fact]
-    public async Task TransactionStatusChange_InvalidSignature_ReturnsRejected()
-    {
-        var host           = BuildHost();
-        var paymentService = host.Services.GetRequiredService<IPaymentService>();
-
-        var result = await paymentService.TransactionStatusChange("Stripe", new TransactionStatusChangePayload
-        {
-            ProviderId = "Stripe",
-            Payload    = """{"id":"evt_test","type":"checkout.session.completed"}""",
-            QueryParameters = new Dictionary<string, StringValues>
-            {
-                { "Stripe-Signature", new StringValues("t=1,v1=invalidsignature") },
-            },
-        });
-
-        Assert.Equal(PaymentStatusEnum.Rejected, result.PaymentStatus);
-    }
-
-    // ─── Testy integracyjne (wymagają sk_test_... z appsettings/env) ─────────
-
-    /// <summary>
-    /// Tworzy rzeczywistą Checkout Session w środowisku testowym Stripe.
-    /// Wymaga STRIPE_SECRET_KEY=sk_test_...
-    /// </summary>
-    [Fact(Skip = "Integration test — requires STRIPE_SECRET_KEY=sk_test_... in env or appsettings.json")]
-    public async Task RegisterPayment_Stripe_CreatesCheckoutSession()
-    {
-        var host           = BuildHost();
-        var paymentService = host.Services.GetRequiredService<IPaymentService>();
-
-        var providers = await paymentService.GetProviders();
-        var channels  = await paymentService.GetChannels("Stripe", "PLN");
-
-        var payment = await paymentService.RegisterPayment(new PaymentRequest
-        {
-            PaymentProvider = "Stripe",
-            PaymentChannel  = "card",
-            PaymentModel    = PaymentModel.OneTime,
-            Title           = "Testowa płatność",
-            Description     = "Integracyjny test Stripe Checkout",
-            Currency        = "PLN",
-            Amount          = 9.99m,
-            Email           = "test@example.com",
-            FirstName       = "Jan",
-            Surname         = "Testowy",
-            AdditionalData  = "test-integration",
-            Referer         = "xunit",
-        });
-
-        Assert.NotNull(payment);
-        Assert.Equal(PaymentStatusEnum.Created, payment.PaymentStatus);
-        Assert.NotEmpty(payment.RedirectUrl!);
-        Assert.StartsWith("cs_test_", payment.PaymentUniqueId);
-        Assert.StartsWith("https://checkout.stripe.com/", payment.RedirectUrl);
-    }
-
-    /// <summary>
-    /// Pobiera status Checkout Session po jej utworzeniu.
-    /// Wymaga STRIPE_SECRET_KEY=sk_test_...
-    /// </summary>
-    [Fact(Skip = "Integration test — requires STRIPE_SECRET_KEY=sk_test_... in env or appsettings.json")]
-    public async Task GetStatus_Stripe_CreatedSession_ReturnsCreated()
-    {
-        var host           = BuildHost();
-        var paymentService = host.Services.GetRequiredService<IPaymentService>();
-
-        // Utwórz sesję
-        var payment = await paymentService.RegisterPayment(new PaymentRequest
-        {
-            PaymentProvider = "Stripe",
-            PaymentChannel  = "card",
-            PaymentModel    = PaymentModel.OneTime,
-            Title           = "Status test",
-            Currency        = "PLN",
-            Amount          = 1.00m,
-            Email           = "status@example.com",
-        });
-
-        // Sprawdź status
-        var status = await paymentService.GetStatus("Stripe", payment.PaymentUniqueId!);
-
-        Assert.NotNull(status);
-        Assert.Equal(PaymentStatusEnum.Created, status.PaymentStatus);
-        Assert.Equal(payment.PaymentUniqueId, status.PaymentUniqueId);
-    }
-}
+using System.Collections.Generic;
+using System.Threading.Tasks;
+using Microsoft.Extensions.Configuration;
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Hosting;
+using Microsoft.Extensions.Primitives;
+using TailoredApps.Shared.Payments;
+using TailoredApps.Shared.Payments.Provider.Stripe;
+using Xunit;
+
+namespace TailoredApps.Shared.Payments.Tests;
+
+/// <summary>
+/// Testy integracyjne providera Stripe.
+///
+/// Testy oznaczone <see cref="FactAttribute"/> bez [Trait] są uruchamiane zawsze.
+/// Testy wymagające połączenia ze Stripe (sk_test_...) są pomijane gdy klucz nie jest ustawiony.
+///
+/// Aby uruchomić testy integracyjne, ustaw zmienne środowiskowe:
+///   STRIPE_SECRET_KEY=sk_test_...
+///   STRIPE_WEBHOOK_SECRET=whsec_...
+/// lub wpisz wartości w appsettings.json (nie commituj kluczy produkcyjnych!).
+/// </summary>
+public class StripePaymentTest
+{
+    // ─── DI setup ────────────────────────────────────────────────────────────
+
+    private static IHost BuildHost() =>
+        Host.CreateDefaultBuilder()
+            .ConfigureAppConfiguration(cfg =>
+            {
+                cfg.AddJsonFile("appsettings.json", optional: true);
+                cfg.AddEnvironmentVariables("STRIPE_"); // STRIPE_SECRET_KEY, STRIPE_WEBHOOK_SECRET itp.
+            })
+            .ConfigureServices((_, services) =>
+            {
+                services.RegisterStripeProvider();
+                services.AddPayments()
+                    .RegisterPaymentProvider<StripeProvider>();
+            })
+            .Build();
+
+    // ─── Unit / smoke tests (nie wymagają połączenia) ────────────────────────
+
+    [Fact]
+    public async Task CanRequestPaymentProviders_IncludesStripe()
+    {
+        var host = BuildHost();
+        var paymentService = host.Services.GetRequiredService<IPaymentService>();
+
+        var providers = await paymentService.GetProviders();
+
+        Assert.Contains(providers, p => p.Id == "Stripe");
+    }
+
+    [Fact]
+    public async Task GetChannels_Stripe_PLN_ReturnsBlikP24Card()
+    {
+        var host = BuildHost();
+        var paymentService = host.Services.GetRequiredService<IPaymentService>();
+
+        var channels = await paymentService.GetChannels("Stripe", "PLN");
+
+        Assert.Contains(channels, c => c.Id == "card");
+        Assert.Contains(channels, c => c.Id == "blik");
+        Assert.Contains(channels, c => c.Id == "p24");
+    }
+
+    [Fact]
+    public async Task GetChannels_Stripe_EUR_ReturnsCardAndSepa()
+    {
+        var host = BuildHost();
+        var paymentService = host.Services.GetRequiredService<IPaymentService>();
+
+        var channels = await paymentService.GetChannels("Stripe", "EUR");
+
+        Assert.Contains(channels, c => c.Id == "card");
+        Assert.Contains(channels, c => c.Id == "sepa_debit");
+    }
+
+    [Fact]
+    public async Task GetChannels_Stripe_USD_ReturnsOnlyCard()
+    {
+        var host = BuildHost();
+        var paymentService = host.Services.GetRequiredService<IPaymentService>();
+
+        var channels = await paymentService.GetChannels("Stripe", "USD");
+
+        Assert.Single(channels, c => c.Id == "card");
+    }
+
+    /// <summary>
+    /// Webhook z nieprawidłowym podpisem zwraca Rejected (nie rzuca wyjątku na zewnątrz).
+    /// </summary>
+    [Fact]
+    public async Task TransactionStatusChange_InvalidSignature_ReturnsRejected()
+    {
+        var host = BuildHost();
+        var paymentService = host.Services.GetRequiredService<IPaymentService>();
+
+        var result = await paymentService.TransactionStatusChange("Stripe", new TransactionStatusChangePayload
+        {
+            ProviderId = "Stripe",
+            Payload = """{"id":"evt_test","type":"checkout.session.completed"}""",
+            QueryParameters = new Dictionary<string, StringValues>
+            {
+                { "Stripe-Signature", new StringValues("t=1,v1=invalidsignature") },
+            },
+        });
+
+        Assert.Equal(PaymentStatusEnum.Rejected, result.PaymentStatus);
+    }
+
+    // ─── Testy integracyjne (wymagają sk_test_... z appsettings/env) ─────────
+
+    /// <summary>
+    /// Tworzy rzeczywistą Checkout Session w środowisku testowym Stripe.
+    /// Wymaga STRIPE_SECRET_KEY=sk_test_...
+    /// </summary>
+    [Fact(Skip = "Integration test — requires STRIPE_SECRET_KEY=sk_test_... in env or appsettings.json")]
+    public async Task RegisterPayment_Stripe_CreatesCheckoutSession()
+    {
+        var host = BuildHost();
+        var paymentService = host.Services.GetRequiredService<IPaymentService>();
+
+        var providers = await paymentService.GetProviders();
+        var channels = await paymentService.GetChannels("Stripe", "PLN");
+
+        var payment = await paymentService.RegisterPayment(new PaymentRequest
+        {
+            PaymentProvider = "Stripe",
+            PaymentChannel = "card",
+            PaymentModel = PaymentModel.OneTime,
+            Title = "Testowa płatność",
+            Description = "Integracyjny test Stripe Checkout",
+            Currency = "PLN",
+            Amount = 9.99m,
+            Email = "test@example.com",
+            FirstName = "Jan",
+            Surname = "Testowy",
+            AdditionalData = "test-integration",
+            Referer = "xunit",
+        });
+
+        Assert.NotNull(payment);
+        Assert.Equal(PaymentStatusEnum.Created, payment.PaymentStatus);
+        Assert.NotEmpty(payment.RedirectUrl!);
+        Assert.StartsWith("cs_test_", payment.PaymentUniqueId);
+        Assert.StartsWith("https://checkout.stripe.com/", payment.RedirectUrl);
+    }
+
+    /// <summary>
+    /// Pobiera status Checkout Session po jej utworzeniu.
+    /// Wymaga STRIPE_SECRET_KEY=sk_test_...
+    /// </summary>
+    [Fact(Skip = "Integration test — requires STRIPE_SECRET_KEY=sk_test_... in env or appsettings.json")]
+    public async Task GetStatus_Stripe_CreatedSession_ReturnsCreated()
+    {
+        var host = BuildHost();
+        var paymentService = host.Services.GetRequiredService<IPaymentService>();
+
+        // Utwórz sesję
+        var payment = await paymentService.RegisterPayment(new PaymentRequest
+        {
+            PaymentProvider = "Stripe",
+            PaymentChannel = "card",
+            PaymentModel = PaymentModel.OneTime,
+            Title = "Status test",
+            Currency = "PLN",
+            Amount = 1.00m,
+            Email = "status@example.com",
+        });
+
+        // Sprawdź status
+        var status = await paymentService.GetStatus("Stripe", payment.PaymentUniqueId!);
+
+        Assert.NotNull(status);
+        Assert.Equal(PaymentStatusEnum.Created, status.PaymentStatus);
+        Assert.Equal(payment.PaymentUniqueId, status.PaymentUniqueId);
+    }
+}
diff --git a/tests/TailoredApps.Shared.Payments.Tests/StripeWebhookSignatureTests.cs b/tests/TailoredApps.Shared.Payments.Tests/StripeWebhookSignatureTests.cs
index f2321c1..36bb926 100644
--- a/tests/TailoredApps.Shared.Payments.Tests/StripeWebhookSignatureTests.cs
+++ b/tests/TailoredApps.Shared.Payments.Tests/StripeWebhookSignatureTests.cs
@@ -1,141 +1,141 @@
-using System;
-using System.Collections.Generic;
-using System.Security.Cryptography;
-using System.Text;
-using System.Threading.Tasks;
-using global::Stripe;
-using Microsoft.Extensions.Configuration;
-using Microsoft.Extensions.DependencyInjection;
-using Microsoft.Extensions.Hosting;
-using TailoredApps.Shared.Payments.Provider.Stripe;
-using Xunit;
-
-namespace TailoredApps.Shared.Payments.Tests;
-
-/// <summary>
-/// Testy weryfikacji podpisu (Stripe-Signature) w webhookach Stripe.
-///
-/// Stripe używa HMAC-SHA256 z webhookSecret jako kluczem.
-/// Format nagłówka: t={unix_timestamp},v1={hmac_hex}
-/// Treść do podpisania: "{t}.{rawPayload}"
-///
-/// Docs: https://stripe.com/docs/webhooks/signatures
-/// </summary>
-public class StripeWebhookSignatureTests
-{
-    // ─── Test webhook secret (lokalny, nie produkcyjny) ──────────────────────
-    // Stripe SDK obcina prefix "whsec_" automatycznie w EventUtility.
-    // HMAC klucz = reszta po "whsec_".
-    private const string TestWebhookSecret = "whsec_test1234567890abcdef1234567890abcdef";
-
-    // Przykładowy payload checkout.session.completed zgodny ze strukturą Stripe Event.
-    // Stripe EventConverter wymaga pola "object" jako discriminatora typu w data.object.
-    private const string SamplePayload = """{"id":"evt_test_001","object":"event","api_version":"2024-06-20","created":1711234567,"livemode":false,"pending_webhooks":1,"request":{"id":null,"idempotency_key":null},"type":"checkout.session.completed","data":{"object":{"id":"cs_test_abc123","object":"checkout.session","payment_status":"paid","status":"complete","livemode":false,"amount_total":999,"currency":"pln","customer_email":"test@example.com"}}}""";
-
-    /// <summary>
-    /// Oblicza poprawny nagłówek Stripe-Signature.
-    /// Stripe SDK: klucz HMAC = secret BEZ prefixu "whsec_".
-    /// Format: t={unix_ts},v1={hmac_hex}
-    /// Signed payload: "{t}.{rawPayload}" (HMAC-SHA256).
-    /// </summary>
-    public static string ComputeStripeSignature(string payload, string secret, long? timestamp = null)
-    {
-        var ts = timestamp ?? DateTimeOffset.UtcNow.ToUnixTimeSeconds();
-        var signedPayload = $"{ts}.{payload}";
-        // Stripe SDK (EventUtility.ValidateSignature) używa pełnego sekretu jako klucza HMAC,
-        // włącznie z prefixem "whsec_" — musimy robić dokładnie to samo.
-        var keyBytes  = Encoding.UTF8.GetBytes(secret);
-        var dataBytes = Encoding.UTF8.GetBytes(signedPayload);
-        using var hmac = new HMACSHA256(keyBytes);
-        var hash      = hmac.ComputeHash(dataBytes);
-        var signature = BitConverter.ToString(hash).Replace("-", "").ToLowerInvariant();
-        return $"t={ts},v1={signature}";
-    }
-
-    /// <summary>
-    /// ConstructWebhookEvent akceptuje poprawny podpis HMAC-SHA256.
-    /// </summary>
-    [Fact]
-    public void ConstructWebhookEvent_ValidSignature_ReturnsEvent()
-    {
-        var caller = BuildCallerWithSecret(TestWebhookSecret);
-
-        // Stripe SDK tolerancja domyślna = 300s → timestamp musi być świeży
-        var signature = ComputeStripeSignature(SamplePayload, TestWebhookSecret);
-
-        var stripeEvent = caller.ConstructWebhookEvent(SamplePayload, signature);
-
-        Assert.NotNull(stripeEvent);
-        Assert.Equal("checkout.session.completed", stripeEvent.Type);
-    }
-
-    /// <summary>
-    /// ConstructWebhookEvent rzuca StripeException gdy podpis jest nieprawidłowy.
-    /// </summary>
-    [Fact]
-    public void ConstructWebhookEvent_InvalidSignature_ThrowsStripeException()
-    {
-        var wrongSecret  = "whsec_wrongsecret0000000000000000000";
-        var badSignature = ComputeStripeSignature(SamplePayload, wrongSecret);
-
-        var caller = BuildCallerWithSecret(TestWebhookSecret);
-
-        Assert.Throws<StripeException>(() =>
-            caller.ConstructWebhookEvent(SamplePayload, badSignature));
-    }
-
-    /// <summary>
-    /// ConstructWebhookEvent rzuca StripeException gdy timestamp jest zbyt stary (>300s).
-    /// Chroni przed replay attacks.
-    /// </summary>
-    [Fact]
-    public void ConstructWebhookEvent_StaleTimestamp_ThrowsStripeException()
-    {
-        var staleTimestamp = DateTimeOffset.UtcNow.AddMinutes(-10).ToUnixTimeSeconds();
-        var signature     = ComputeStripeSignature(SamplePayload, TestWebhookSecret, staleTimestamp);
-
-        var caller = BuildCallerWithSecret(TestWebhookSecret);
-
-        Assert.Throws<StripeException>(() =>
-            caller.ConstructWebhookEvent(SamplePayload, signature));
-    }
-
-    /// <summary>
-    /// ConstructWebhookEvent rzuca StripeException gdy payload został zmodyfikowany.
-    /// Integralność body jest chroniona przez HMAC.
-    /// </summary>
-    [Fact]
-    public void ConstructWebhookEvent_TamperedPayload_ThrowsStripeException()
-    {
-        var signature       = ComputeStripeSignature(SamplePayload, TestWebhookSecret);
-        var tamperedPayload = SamplePayload.Replace("paid", "unpaid");
-
-        var caller = BuildCallerWithSecret(TestWebhookSecret);
-
-        Assert.Throws<StripeException>(() =>
-            caller.ConstructWebhookEvent(tamperedPayload, signature));
-    }
-
-    // ─── Helpers ─────────────────────────────────────────────────────────────
-
-    private static IStripeServiceCaller BuildCallerWithSecret(string webhookSecret)
-    {
-        var host = Host.CreateDefaultBuilder()
-            .ConfigureAppConfiguration(cfg => cfg.AddInMemoryCollection(
-                new Dictionary<string, string>
-                {
-                    ["Payments:Providers:Stripe:SecretKey"]     = "sk_test_unused",
-                    ["Payments:Providers:Stripe:WebhookSecret"] = webhookSecret,
-                    ["Payments:Providers:Stripe:SuccessUrl"]    = "https://example.com/ok",
-                    ["Payments:Providers:Stripe:CancelUrl"]     = "https://example.com/cancel",
-                }!))
-            .ConfigureServices((_, services) =>
-            {
-                services.RegisterStripeProvider();
-                services.AddPayments().RegisterPaymentProvider<StripeProvider>();
-            })
-            .Build();
-
-        return host.Services.GetRequiredService<IStripeServiceCaller>();
-    }
-}
+using System;
+using System.Collections.Generic;
+using System.Security.Cryptography;
+using System.Text;
+using System.Threading.Tasks;
+using global::Stripe;
+using Microsoft.Extensions.Configuration;
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Hosting;
+using TailoredApps.Shared.Payments.Provider.Stripe;
+using Xunit;
+
+namespace TailoredApps.Shared.Payments.Tests;
+
+/// <summary>
+/// Testy weryfikacji podpisu (Stripe-Signature) w webhookach Stripe.
+///
+/// Stripe używa HMAC-SHA256 z webhookSecret jako kluczem.
+/// Format nagłówka: t={unix_timestamp},v1={hmac_hex}
+/// Treść do podpisania: "{t}.{rawPayload}"
+///
+/// Docs: https://stripe.com/docs/webhooks/signatures
+/// </summary>
+public class StripeWebhookSignatureTests
+{
+    // ─── Test webhook secret (lokalny, nie produkcyjny) ──────────────────────
+    // Stripe SDK obcina prefix "whsec_" automatycznie w EventUtility.
+    // HMAC klucz = reszta po "whsec_".
+    private const string TestWebhookSecret = "whsec_test1234567890abcdef1234567890abcdef";
+
+    // Przykładowy payload checkout.session.completed zgodny ze strukturą Stripe Event.
+    // Stripe EventConverter wymaga pola "object" jako discriminatora typu w data.object.
+    private const string SamplePayload = """{"id":"evt_test_001","object":"event","api_version":"2024-06-20","created":1711234567,"livemode":false,"pending_webhooks":1,"request":{"id":null,"idempotency_key":null},"type":"checkout.session.completed","data":{"object":{"id":"cs_test_abc123","object":"checkout.session","payment_status":"paid","status":"complete","livemode":false,"amount_total":999,"currency":"pln","customer_email":"test@example.com"}}}""";
+
+    /// <summary>
+    /// Oblicza poprawny nagłówek Stripe-Signature.
+    /// Stripe SDK: klucz HMAC = secret BEZ prefixu "whsec_".
+    /// Format: t={unix_ts},v1={hmac_hex}
+    /// Signed payload: "{t}.{rawPayload}" (HMAC-SHA256).
+    /// </summary>
+    public static string ComputeStripeSignature(string payload, string secret, long? timestamp = null)
+    {
+        var ts = timestamp ?? DateTimeOffset.UtcNow.ToUnixTimeSeconds();
+        var signedPayload = $"{ts}.{payload}";
+        // Stripe SDK (EventUtility.ValidateSignature) używa pełnego sekretu jako klucza HMAC,
+        // włącznie z prefixem "whsec_" — musimy robić dokładnie to samo.
+        var keyBytes = Encoding.UTF8.GetBytes(secret);
+        var dataBytes = Encoding.UTF8.GetBytes(signedPayload);
+        using var hmac = new HMACSHA256(keyBytes);
+        var hash = hmac.ComputeHash(dataBytes);
+        var signature = BitConverter.ToString(hash).Replace("-", "").ToLowerInvariant();
+        return $"t={ts},v1={signature}";
+    }
+
+    /// <summary>
+    /// ConstructWebhookEvent akceptuje poprawny podpis HMAC-SHA256.
+    /// </summary>
+    [Fact]
+    public void ConstructWebhookEvent_ValidSignature_ReturnsEvent()
+    {
+        var caller = BuildCallerWithSecret(TestWebhookSecret);
+
+        // Stripe SDK tolerancja domyślna = 300s → timestamp musi być świeży
+        var signature = ComputeStripeSignature(SamplePayload, TestWebhookSecret);
+
+        var stripeEvent = caller.ConstructWebhookEvent(SamplePayload, signature);
+
+        Assert.NotNull(stripeEvent);
+        Assert.Equal("checkout.session.completed", stripeEvent.Type);
+    }
+
+    /// <summary>
+    /// ConstructWebhookEvent rzuca StripeException gdy podpis jest nieprawidłowy.
+    /// </summary>
+    [Fact]
+    public void ConstructWebhookEvent_InvalidSignature_ThrowsStripeException()
+    {
+        var wrongSecret = "whsec_wrongsecret0000000000000000000";
+        var badSignature = ComputeStripeSignature(SamplePayload, wrongSecret);
+
+        var caller = BuildCallerWithSecret(TestWebhookSecret);
+
+        Assert.Throws<StripeException>(() =>
+            caller.ConstructWebhookEvent(SamplePayload, badSignature));
+    }
+
+    /// <summary>
+    /// ConstructWebhookEvent rzuca StripeException gdy timestamp jest zbyt stary (>300s).
+    /// Chroni przed replay attacks.
+    /// </summary>
+    [Fact]
+    public void ConstructWebhookEvent_StaleTimestamp_ThrowsStripeException()
+    {
+        var staleTimestamp = DateTimeOffset.UtcNow.AddMinutes(-10).ToUnixTimeSeconds();
+        var signature = ComputeStripeSignature(SamplePayload, TestWebhookSecret, staleTimestamp);
+
+        var caller = BuildCallerWithSecret(TestWebhookSecret);
+
+        Assert.Throws<StripeException>(() =>
+            caller.ConstructWebhookEvent(SamplePayload, signature));
+    }
+
+    /// <summary>
+    /// ConstructWebhookEvent rzuca StripeException gdy payload został zmodyfikowany.
+    /// Integralność body jest chroniona przez HMAC.
+    /// </summary>
+    [Fact]
+    public void ConstructWebhookEvent_TamperedPayload_ThrowsStripeException()
+    {
+        var signature = ComputeStripeSignature(SamplePayload, TestWebhookSecret);
+        var tamperedPayload = SamplePayload.Replace("paid", "unpaid");
+
+        var caller = BuildCallerWithSecret(TestWebhookSecret);
+
+        Assert.Throws<StripeException>(() =>
+            caller.ConstructWebhookEvent(tamperedPayload, signature));
+    }
+
+    // ─── Helpers ─────────────────────────────────────────────────────────────
+
+    private static IStripeServiceCaller BuildCallerWithSecret(string webhookSecret)
+    {
+        var host = Host.CreateDefaultBuilder()
+            .ConfigureAppConfiguration(cfg => cfg.AddInMemoryCollection(
+                new Dictionary<string, string>
+                {
+                    ["Payments:Providers:Stripe:SecretKey"] = "sk_test_unused",
+                    ["Payments:Providers:Stripe:WebhookSecret"] = webhookSecret,
+                    ["Payments:Providers:Stripe:SuccessUrl"] = "https://example.com/ok",
+                    ["Payments:Providers:Stripe:CancelUrl"] = "https://example.com/cancel",
+                }!))
+            .ConfigureServices((_, services) =>
+            {
+                services.RegisterStripeProvider();
+                services.AddPayments().RegisterPaymentProvider<StripeProvider>();
+            })
+            .Build();
+
+        return host.Services.GetRequiredService<IStripeServiceCaller>();
+    }
+}
diff --git a/tests/TailoredApps.Shared.Payments.Tests/WebhookProviderTests.cs b/tests/TailoredApps.Shared.Payments.Tests/WebhookProviderTests.cs
index b2864f9..21dd2d2 100644
--- a/tests/TailoredApps.Shared.Payments.Tests/WebhookProviderTests.cs
+++ b/tests/TailoredApps.Shared.Payments.Tests/WebhookProviderTests.cs
@@ -1,558 +1,558 @@
-using System.Collections.Generic;
-using System.Threading.Tasks;
-using Microsoft.Extensions.Options;
-using Microsoft.Extensions.Primitives;
-using Moq;
-using TailoredApps.Shared.Payments;
-using TailoredApps.Shared.Payments.Provider.Adyen;
-using TailoredApps.Shared.Payments.Provider.HotPay;
-using TailoredApps.Shared.Payments.Provider.PayNow;
-using TailoredApps.Shared.Payments.Provider.PayU;
-using TailoredApps.Shared.Payments.Provider.Przelewy24;
-using TailoredApps.Shared.Payments.Provider.Revolut;
-using TailoredApps.Shared.Payments.Provider.Tpay;
-using Xunit;
-
-namespace TailoredApps.Shared.Payments.Tests;
-
-// ─── Adyen ───────────────────────────────────────────────────────────────────
-
-public class AdyenWebhookTests
-{
-    private static AdyenProvider Build(IAdyenServiceCaller caller) => new(caller);
-
-    [Fact]
-    public async Task HandleWebhook_ValidHmac_AUTHORISATION_success_ReturnsOk_Finished()
-    {
-        var body = """{"notificationItems":[{"NotificationRequestItem":{"eventCode":"AUTHORISATION","success":"true","pspReference":"psp_1"}}]}""";
-        var mock = new Mock<IAdyenServiceCaller>();
-        mock.Setup(m => m.VerifyNotificationHmac(body, "hmac_val")).Returns(true);
-
-        var request = new PaymentWebhookRequest
-        {
-            Body    = body,
-            Headers = new Dictionary<string, StringValues> { { "HmacSignature", "hmac_val" } },
-        };
-        var result = await Build(mock.Object).HandleWebhookAsync(request);
-
-        Assert.True(result.Success);
-        Assert.False(result.Ignored);
-        Assert.Equal(PaymentStatusEnum.Finished, result.PaymentResponse!.PaymentStatus);
-    }
-
-    [Fact]
-    public async Task HandleWebhook_ValidHmac_AUTHORISATION_failed_ReturnsOk_Rejected()
-    {
-        var body = """{"notificationItems":[{"NotificationRequestItem":{"eventCode":"AUTHORISATION","success":"false","pspReference":"psp_1"}}]}""";
-        var mock = new Mock<IAdyenServiceCaller>();
-        mock.Setup(m => m.VerifyNotificationHmac(body, "hmac_val")).Returns(true);
-
-        var request = new PaymentWebhookRequest
-        {
-            Body    = body,
-            Headers = new Dictionary<string, StringValues> { { "HmacSignature", "hmac_val" } },
-        };
-        var result = await Build(mock.Object).HandleWebhookAsync(request);
-
-        Assert.True(result.Success);
-        Assert.False(result.Ignored);
-        Assert.Equal(PaymentStatusEnum.Rejected, result.PaymentResponse!.PaymentStatus);
-    }
-
-    [Fact]
-    public async Task HandleWebhook_InvalidHmac_ReturnsFail()
-    {
-        var mock = new Mock<IAdyenServiceCaller>();
-        mock.Setup(m => m.VerifyNotificationHmac(It.IsAny<string>(), It.IsAny<string>())).Returns(false);
-
-        var result = await Build(mock.Object).HandleWebhookAsync(new PaymentWebhookRequest
-        {
-            Body    = "{}",
-            Headers = new Dictionary<string, StringValues> { { "HmacSignature", "bad" } },
-        });
-
-        Assert.False(result.Success);
-        Assert.NotNull(result.ErrorMessage);
-    }
-
-    [Fact]
-    public async Task HandleWebhook_ValidHmac_UnknownEvent_ReturnsIgnore()
-    {
-        var body = """{"notificationItems":[{"NotificationRequestItem":{"eventCode":"UNKNOWN_EVENT","success":"true"}}]}""";
-        var mock = new Mock<IAdyenServiceCaller>();
-        mock.Setup(m => m.VerifyNotificationHmac(body, "hmac_val")).Returns(true);
-
-        var request = new PaymentWebhookRequest
-        {
-            Body    = body,
-            Headers = new Dictionary<string, StringValues> { { "HmacSignature", "hmac_val" } },
-        };
-        var result = await Build(mock.Object).HandleWebhookAsync(request);
-
-        Assert.True(result.Success);
-        Assert.True(result.Ignored);
-    }
-}
-
-// ─── HotPay ──────────────────────────────────────────────────────────────────
-
-public class HotPayWebhookTests
-{
-    private static HotPayProvider Build(IHotPayServiceCaller caller) => new(caller);
-
-    [Fact]
-    public async Task HandleWebhook_ValidHash_SUCCESS_ReturnsOk_Finished()
-    {
-        var mock = new Mock<IHotPayServiceCaller>();
-        mock.Setup(m => m.VerifyNotification("abc123", "99.99", "PAY_001", "SUCCESS")).Returns(true);
-
-        var request = new PaymentWebhookRequest
-        {
-            Query = new Dictionary<string, StringValues>
-            {
-                { "HASH",         "abc123"  },
-                { "KWOTA",        "99.99"   },
-                { "ID_PLATNOSCI", "PAY_001" },
-                { "STATUS",       "SUCCESS" },
-            },
-        };
-        var result = await Build(mock.Object).HandleWebhookAsync(request);
-
-        Assert.True(result.Success);
-        Assert.False(result.Ignored);
-        Assert.Equal(PaymentStatusEnum.Finished, result.PaymentResponse!.PaymentStatus);
-        Assert.Equal("PAY_001", result.PaymentResponse!.PaymentUniqueId);
-    }
-
-    [Fact]
-    public async Task HandleWebhook_ValidHash_FAILURE_ReturnsOk_Rejected()
-    {
-        var mock = new Mock<IHotPayServiceCaller>();
-        mock.Setup(m => m.VerifyNotification("abc123", "99.99", "PAY_001", "FAILURE")).Returns(true);
-
-        var request = new PaymentWebhookRequest
-        {
-            Query = new Dictionary<string, StringValues>
-            {
-                { "HASH",         "abc123"  },
-                { "KWOTA",        "99.99"   },
-                { "ID_PLATNOSCI", "PAY_001" },
-                { "STATUS",       "FAILURE" },
-            },
-        };
-        var result = await Build(mock.Object).HandleWebhookAsync(request);
-
-        Assert.True(result.Success);
-        Assert.False(result.Ignored);
-        Assert.Equal(PaymentStatusEnum.Rejected, result.PaymentResponse!.PaymentStatus);
-    }
-
-    [Fact]
-    public async Task HandleWebhook_InvalidHash_ReturnsFail()
-    {
-        var mock = new Mock<IHotPayServiceCaller>();
-        mock.Setup(m => m.VerifyNotification(It.IsAny<string>(), It.IsAny<string>(), It.IsAny<string>(), It.IsAny<string>())).Returns(false);
-
-        var request = new PaymentWebhookRequest
-        {
-            Query = new Dictionary<string, StringValues>
-            {
-                { "HASH",         "bad"     },
-                { "KWOTA",        "99.99"   },
-                { "ID_PLATNOSCI", "PAY_001" },
-                { "STATUS",       "SUCCESS" },
-            },
-        };
-        var result = await Build(mock.Object).HandleWebhookAsync(request);
-
-        Assert.False(result.Success);
-        Assert.NotNull(result.ErrorMessage);
-    }
-}
-
-// ─── PayNow ──────────────────────────────────────────────────────────────────
-
-public class PayNowWebhookTests
-{
-    private static PayNowProvider Build(IPayNowServiceCaller caller) => new(caller);
-
-    [Fact]
-    public async Task HandleWebhook_ValidSignature_CONFIRMED_ReturnsOk_Finished()
-    {
-        var body = """{"paymentId":"pn_1","status":"CONFIRMED"}""";
-        var mock = new Mock<IPayNowServiceCaller>();
-        mock.Setup(m => m.VerifySignature(body, "sig_val")).Returns(true);
-
-        var request = new PaymentWebhookRequest
-        {
-            Body    = body,
-            Headers = new Dictionary<string, StringValues> { { "Signature", "sig_val" } },
-        };
-        var result = await Build(mock.Object).HandleWebhookAsync(request);
-
-        Assert.True(result.Success);
-        Assert.False(result.Ignored);
-        Assert.Equal(PaymentStatusEnum.Finished, result.PaymentResponse!.PaymentStatus);
-    }
-
-    [Fact]
-    public async Task HandleWebhook_ValidSignature_REJECTED_ReturnsOk_Rejected()
-    {
-        var body = """{"paymentId":"pn_1","status":"REJECTED"}""";
-        var mock = new Mock<IPayNowServiceCaller>();
-        mock.Setup(m => m.VerifySignature(body, "sig_val")).Returns(true);
-
-        var request = new PaymentWebhookRequest
-        {
-            Body    = body,
-            Headers = new Dictionary<string, StringValues> { { "Signature", "sig_val" } },
-        };
-        var result = await Build(mock.Object).HandleWebhookAsync(request);
-
-        Assert.True(result.Success);
-        Assert.False(result.Ignored);
-        Assert.Equal(PaymentStatusEnum.Rejected, result.PaymentResponse!.PaymentStatus);
-    }
-
-    [Fact]
-    public async Task HandleWebhook_InvalidSignature_ReturnsFail()
-    {
-        var mock = new Mock<IPayNowServiceCaller>();
-        mock.Setup(m => m.VerifySignature(It.IsAny<string>(), It.IsAny<string>())).Returns(false);
-
-        var result = await Build(mock.Object).HandleWebhookAsync(new PaymentWebhookRequest
-        {
-            Body    = """{"status":"CONFIRMED"}""",
-            Headers = new Dictionary<string, StringValues> { { "Signature", "bad" } },
-        });
-
-        Assert.False(result.Success);
-        Assert.NotNull(result.ErrorMessage);
-    }
-
-    [Fact]
-    public async Task HandleWebhook_ValidSignature_PENDING_ReturnsIgnore()
-    {
-        var body = """{"paymentId":"pn_1","status":"PENDING"}""";
-        var mock = new Mock<IPayNowServiceCaller>();
-        mock.Setup(m => m.VerifySignature(body, "sig_val")).Returns(true);
-
-        var request = new PaymentWebhookRequest
-        {
-            Body    = body,
-            Headers = new Dictionary<string, StringValues> { { "Signature", "sig_val" } },
-        };
-        var result = await Build(mock.Object).HandleWebhookAsync(request);
-
-        Assert.True(result.Success);
-        Assert.True(result.Ignored);
-    }
-}
-
-// ─── PayU ────────────────────────────────────────────────────────────────────
-
-public class PayUWebhookTests
-{
-    private static PayUProvider Build(IPayUServiceCaller caller) => new(caller);
-
-    [Fact]
-    public async Task HandleWebhook_ValidSignature_COMPLETED_ReturnsOk_Finished()
-    {
-        var body = """{"order":{"orderId":"ord_1","status":"COMPLETED"}}""";
-        var mock = new Mock<IPayUServiceCaller>();
-        mock.Setup(m => m.VerifySignature(body, "sig_val")).Returns(true);
-
-        var request = new PaymentWebhookRequest
-        {
-            Body    = body,
-            Headers = new Dictionary<string, StringValues> { { "OpenPayU-Signature", "sig_val" } },
-        };
-        var result = await Build(mock.Object).HandleWebhookAsync(request);
-
-        Assert.True(result.Success);
-        Assert.False(result.Ignored);
-        Assert.Equal(PaymentStatusEnum.Finished, result.PaymentResponse!.PaymentStatus);
-    }
-
-    [Fact]
-    public async Task HandleWebhook_ValidSignature_CANCELED_ReturnsOk_Rejected()
-    {
-        var body = """{"order":{"orderId":"ord_1","status":"CANCELED"}}""";
-        var mock = new Mock<IPayUServiceCaller>();
-        mock.Setup(m => m.VerifySignature(body, "sig_val")).Returns(true);
-
-        var request = new PaymentWebhookRequest
-        {
-            Body    = body,
-            Headers = new Dictionary<string, StringValues> { { "OpenPayU-Signature", "sig_val" } },
-        };
-        var result = await Build(mock.Object).HandleWebhookAsync(request);
-
-        Assert.True(result.Success);
-        Assert.False(result.Ignored);
-        Assert.Equal(PaymentStatusEnum.Rejected, result.PaymentResponse!.PaymentStatus);
-    }
-
-    [Fact]
-    public async Task HandleWebhook_InvalidSignature_ReturnsFail()
-    {
-        var mock = new Mock<IPayUServiceCaller>();
-        mock.Setup(m => m.VerifySignature(It.IsAny<string>(), It.IsAny<string>())).Returns(false);
-
-        var result = await Build(mock.Object).HandleWebhookAsync(new PaymentWebhookRequest
-        {
-            Body    = """{"order":{"status":"COMPLETED"}}""",
-            Headers = new Dictionary<string, StringValues> { { "OpenPayU-Signature", "bad" } },
-        });
-
-        Assert.False(result.Success);
-        Assert.NotNull(result.ErrorMessage);
-    }
-
-    [Fact]
-    public async Task HandleWebhook_ValidSignature_PENDING_ReturnsIgnore()
-    {
-        var body = """{"order":{"orderId":"ord_1","status":"PENDING"}}""";
-        var mock = new Mock<IPayUServiceCaller>();
-        mock.Setup(m => m.VerifySignature(body, "sig_val")).Returns(true);
-
-        var request = new PaymentWebhookRequest
-        {
-            Body    = body,
-            Headers = new Dictionary<string, StringValues> { { "OpenPayU-Signature", "sig_val" } },
-        };
-        var result = await Build(mock.Object).HandleWebhookAsync(request);
-
-        Assert.True(result.Success);
-        Assert.True(result.Ignored);
-    }
-}
-
-// ─── Przelewy24 ──────────────────────────────────────────────────────────────
-
-public class Przelewy24WebhookTests
-{
-    private static Przelewy24Provider Build(IPrzelewy24ServiceCaller caller)
-        => new(caller, Options.Create(new Przelewy24ServiceOptions()));
-
-    [Fact]
-    public async Task HandleWebhook_ValidSignature_VerifyOk_ReturnsOk_Finished()
-    {
-        var body = """{"sessionId":"sess_1","orderId":12345,"merchantId":100,"amount":1000,"currency":"PLN","sign":"abc"}""";
-        var mock = new Mock<IPrzelewy24ServiceCaller>();
-        mock.Setup(m => m.VerifyNotification(body)).Returns(true);
-        mock.Setup(m => m.VerifyTransactionAsync("sess_1", 1000, "PLN", 12345))
-            .ReturnsAsync(PaymentStatusEnum.Finished);
-
-        var request = new PaymentWebhookRequest { Body = body };
-        var result  = await Build(mock.Object).HandleWebhookAsync(request);
-
-        Assert.True(result.Success);
-        Assert.False(result.Ignored);
-        Assert.Equal(PaymentStatusEnum.Finished, result.PaymentResponse!.PaymentStatus);
-    }
-
-    [Fact]
-    public async Task HandleWebhook_ValidSignature_VerifyFails_ReturnsOk_Rejected()
-    {
-        var body = """{"sessionId":"sess_1","orderId":12345,"merchantId":100,"amount":1000,"currency":"PLN","sign":"abc"}""";
-        var mock = new Mock<IPrzelewy24ServiceCaller>();
-        mock.Setup(m => m.VerifyNotification(body)).Returns(true);
-        mock.Setup(m => m.VerifyTransactionAsync("sess_1", 1000, "PLN", 12345))
-            .ReturnsAsync(PaymentStatusEnum.Rejected);
-
-        var request = new PaymentWebhookRequest { Body = body };
-        var result  = await Build(mock.Object).HandleWebhookAsync(request);
-
-        Assert.True(result.Success);
-        Assert.False(result.Ignored);
-        Assert.Equal(PaymentStatusEnum.Rejected, result.PaymentResponse!.PaymentStatus);
-    }
-
-    [Fact]
-    public async Task HandleWebhook_InvalidSignature_ReturnsFail()
-    {
-        var body = """{"sessionId":"sess_1","orderId":12345,"merchantId":100,"amount":1000,"currency":"PLN","sign":"bad"}""";
-        var mock = new Mock<IPrzelewy24ServiceCaller>();
-        mock.Setup(m => m.VerifyNotification(body)).Returns(false);
-
-        var result = await Build(mock.Object).HandleWebhookAsync(new PaymentWebhookRequest { Body = body });
-
-        Assert.False(result.Success);
-        Assert.NotNull(result.ErrorMessage);
-    }
-}
-
-// ─── Revolut ─────────────────────────────────────────────────────────────────
-
-public class RevolutWebhookTests
-{
-    private static RevolutProvider Build(IRevolutServiceCaller caller) => new(caller);
-
-    [Fact]
-    public async Task HandleWebhook_ValidSignature_ORDER_COMPLETED_ReturnsOk_Finished()
-    {
-        var body = """{"event":"ORDER_COMPLETED","order":{"id":"rev_1","state":"completed"}}""";
-        var mock = new Mock<IRevolutServiceCaller>();
-        mock.Setup(m => m.VerifyWebhookSignature(body, "ts_123", "v1=hexhex")).Returns(true);
-
-        var request = new PaymentWebhookRequest
-        {
-            Body    = body,
-            Headers = new Dictionary<string, StringValues>
-            {
-                { "Revolut-Request-Timestamp", "ts_123"    },
-                { "Revolut-Signature",         "v1=hexhex" },
-            },
-        };
-        var result = await Build(mock.Object).HandleWebhookAsync(request);
-
-        Assert.True(result.Success);
-        Assert.False(result.Ignored);
-        Assert.Equal(PaymentStatusEnum.Finished, result.PaymentResponse!.PaymentStatus);
-    }
-
-    [Fact]
-    public async Task HandleWebhook_ValidSignature_ORDER_CANCELLED_ReturnsOk_Rejected()
-    {
-        var body = """{"event":"ORDER_CANCELLED","order":{"id":"rev_1"}}""";
-        var mock = new Mock<IRevolutServiceCaller>();
-        mock.Setup(m => m.VerifyWebhookSignature(body, "ts_123", "v1=hexhex")).Returns(true);
-
-        var request = new PaymentWebhookRequest
-        {
-            Body    = body,
-            Headers = new Dictionary<string, StringValues>
-            {
-                { "Revolut-Request-Timestamp", "ts_123"    },
-                { "Revolut-Signature",         "v1=hexhex" },
-            },
-        };
-        var result = await Build(mock.Object).HandleWebhookAsync(request);
-
-        Assert.True(result.Success);
-        Assert.False(result.Ignored);
-        Assert.Equal(PaymentStatusEnum.Rejected, result.PaymentResponse!.PaymentStatus);
-    }
-
-    [Fact]
-    public async Task HandleWebhook_InvalidSignature_ReturnsFail()
-    {
-        var mock = new Mock<IRevolutServiceCaller>();
-        mock.Setup(m => m.VerifyWebhookSignature(It.IsAny<string>(), It.IsAny<string>(), It.IsAny<string>())).Returns(false);
-
-        var result = await Build(mock.Object).HandleWebhookAsync(new PaymentWebhookRequest
-        {
-            Body    = """{"event":"ORDER_COMPLETED"}""",
-            Headers = new Dictionary<string, StringValues>
-            {
-                { "Revolut-Request-Timestamp", "ts_123" },
-                { "Revolut-Signature",         "bad"    },
-            },
-        });
-
-        Assert.False(result.Success);
-        Assert.NotNull(result.ErrorMessage);
-    }
-
-    [Fact]
-    public async Task HandleWebhook_ValidSignature_UnknownEvent_ReturnsIgnore()
-    {
-        var body = """{"event":"ORDER_AUTHORISED","order":{"id":"rev_1"}}""";
-        var mock = new Mock<IRevolutServiceCaller>();
-        mock.Setup(m => m.VerifyWebhookSignature(body, "ts_123", "v1=hexhex")).Returns(true);
-
-        var request = new PaymentWebhookRequest
-        {
-            Body    = body,
-            Headers = new Dictionary<string, StringValues>
-            {
-                { "Revolut-Request-Timestamp", "ts_123"    },
-                { "Revolut-Signature",         "v1=hexhex" },
-            },
-        };
-        var result = await Build(mock.Object).HandleWebhookAsync(request);
-
-        Assert.True(result.Success);
-        Assert.True(result.Ignored);
-    }
-}
-
-// ─── Tpay ────────────────────────────────────────────────────────────────────
-
-public class TpayWebhookTests
-{
-    private static TpayProvider Build(ITpayServiceCaller caller) => new(caller);
-
-    [Fact]
-    public async Task HandleWebhook_ValidSignature_paid_ReturnsOk_Finished()
-    {
-        var body = """{"id":"tpay_1","status":"paid"}""";
-        var mock = new Mock<ITpayServiceCaller>();
-        mock.Setup(m => m.VerifyNotification(body, "sig_val")).Returns(true);
-
-        var request = new PaymentWebhookRequest
-        {
-            Body    = body,
-            Headers = new Dictionary<string, StringValues> { { "X-Signature", "sig_val" } },
-        };
-        var result = await Build(mock.Object).HandleWebhookAsync(request);
-
-        Assert.True(result.Success);
-        Assert.False(result.Ignored);
-        Assert.Equal(PaymentStatusEnum.Finished, result.PaymentResponse!.PaymentStatus);
-    }
-
-    [Fact]
-    public async Task HandleWebhook_ValidSignature_error_ReturnsOk_Rejected()
-    {
-        var body = """{"id":"tpay_1","status":"error"}""";
-        var mock = new Mock<ITpayServiceCaller>();
-        mock.Setup(m => m.VerifyNotification(body, "sig_val")).Returns(true);
-
-        var request = new PaymentWebhookRequest
-        {
-            Body    = body,
-            Headers = new Dictionary<string, StringValues> { { "X-Signature", "sig_val" } },
-        };
-        var result = await Build(mock.Object).HandleWebhookAsync(request);
-
-        Assert.True(result.Success);
-        Assert.False(result.Ignored);
-        Assert.Equal(PaymentStatusEnum.Rejected, result.PaymentResponse!.PaymentStatus);
-    }
-
-    [Fact]
-    public async Task HandleWebhook_InvalidSignature_ReturnsFail()
-    {
-        var mock = new Mock<ITpayServiceCaller>();
-        mock.Setup(m => m.VerifyNotification(It.IsAny<string>(), It.IsAny<string>())).Returns(false);
-
-        var result = await Build(mock.Object).HandleWebhookAsync(new PaymentWebhookRequest
-        {
-            Body    = """{"status":"paid"}""",
-            Headers = new Dictionary<string, StringValues> { { "X-Signature", "bad" } },
-        });
-
-        Assert.False(result.Success);
-        Assert.NotNull(result.ErrorMessage);
-    }
-
-    [Fact]
-    public async Task HandleWebhook_ValidSignature_pending_ReturnsIgnore()
-    {
-        var body = """{"id":"tpay_1","status":"pending"}""";
-        var mock = new Mock<ITpayServiceCaller>();
-        mock.Setup(m => m.VerifyNotification(body, "sig_val")).Returns(true);
-
-        var request = new PaymentWebhookRequest
-        {
-            Body    = body,
-            Headers = new Dictionary<string, StringValues> { { "X-Signature", "sig_val" } },
-        };
-        var result = await Build(mock.Object).HandleWebhookAsync(request);
-
-        Assert.True(result.Success);
-        Assert.True(result.Ignored);
-    }
-}
+using System.Collections.Generic;
+using System.Threading.Tasks;
+using Microsoft.Extensions.Options;
+using Microsoft.Extensions.Primitives;
+using Moq;
+using TailoredApps.Shared.Payments;
+using TailoredApps.Shared.Payments.Provider.Adyen;
+using TailoredApps.Shared.Payments.Provider.HotPay;
+using TailoredApps.Shared.Payments.Provider.PayNow;
+using TailoredApps.Shared.Payments.Provider.PayU;
+using TailoredApps.Shared.Payments.Provider.Przelewy24;
+using TailoredApps.Shared.Payments.Provider.Revolut;
+using TailoredApps.Shared.Payments.Provider.Tpay;
+using Xunit;
+
+namespace TailoredApps.Shared.Payments.Tests;
+
+// ─── Adyen ───────────────────────────────────────────────────────────────────
+
+public class AdyenWebhookTests
+{
+    private static AdyenProvider Build(IAdyenServiceCaller caller) => new(caller);
+
+    [Fact]
+    public async Task HandleWebhook_ValidHmac_AUTHORISATION_success_ReturnsOk_Finished()
+    {
+        var body = """{"notificationItems":[{"NotificationRequestItem":{"eventCode":"AUTHORISATION","success":"true","pspReference":"psp_1"}}]}""";
+        var mock = new Mock<IAdyenServiceCaller>();
+        mock.Setup(m => m.VerifyNotificationHmac(body, "hmac_val")).Returns(true);
+
+        var request = new PaymentWebhookRequest
+        {
+            Body = body,
+            Headers = new Dictionary<string, StringValues> { { "HmacSignature", "hmac_val" } },
+        };
+        var result = await Build(mock.Object).HandleWebhookAsync(request);
+
+        Assert.True(result.Success);
+        Assert.False(result.Ignored);
+        Assert.Equal(PaymentStatusEnum.Finished, result.PaymentResponse!.PaymentStatus);
+    }
+
+    [Fact]
+    public async Task HandleWebhook_ValidHmac_AUTHORISATION_failed_ReturnsOk_Rejected()
+    {
+        var body = """{"notificationItems":[{"NotificationRequestItem":{"eventCode":"AUTHORISATION","success":"false","pspReference":"psp_1"}}]}""";
+        var mock = new Mock<IAdyenServiceCaller>();
+        mock.Setup(m => m.VerifyNotificationHmac(body, "hmac_val")).Returns(true);
+
+        var request = new PaymentWebhookRequest
+        {
+            Body = body,
+            Headers = new Dictionary<string, StringValues> { { "HmacSignature", "hmac_val" } },
+        };
+        var result = await Build(mock.Object).HandleWebhookAsync(request);
+
+        Assert.True(result.Success);
+        Assert.False(result.Ignored);
+        Assert.Equal(PaymentStatusEnum.Rejected, result.PaymentResponse!.PaymentStatus);
+    }
+
+    [Fact]
+    public async Task HandleWebhook_InvalidHmac_ReturnsFail()
+    {
+        var mock = new Mock<IAdyenServiceCaller>();
+        mock.Setup(m => m.VerifyNotificationHmac(It.IsAny<string>(), It.IsAny<string>())).Returns(false);
+
+        var result = await Build(mock.Object).HandleWebhookAsync(new PaymentWebhookRequest
+        {
+            Body = "{}",
+            Headers = new Dictionary<string, StringValues> { { "HmacSignature", "bad" } },
+        });
+
+        Assert.False(result.Success);
+        Assert.NotNull(result.ErrorMessage);
+    }
+
+    [Fact]
+    public async Task HandleWebhook_ValidHmac_UnknownEvent_ReturnsIgnore()
+    {
+        var body = """{"notificationItems":[{"NotificationRequestItem":{"eventCode":"UNKNOWN_EVENT","success":"true"}}]}""";
+        var mock = new Mock<IAdyenServiceCaller>();
+        mock.Setup(m => m.VerifyNotificationHmac(body, "hmac_val")).Returns(true);
+
+        var request = new PaymentWebhookRequest
+        {
+            Body = body,
+            Headers = new Dictionary<string, StringValues> { { "HmacSignature", "hmac_val" } },
+        };
+        var result = await Build(mock.Object).HandleWebhookAsync(request);
+
+        Assert.True(result.Success);
+        Assert.True(result.Ignored);
+    }
+}
+
+// ─── HotPay ──────────────────────────────────────────────────────────────────
+
+public class HotPayWebhookTests
+{
+    private static HotPayProvider Build(IHotPayServiceCaller caller) => new(caller);
+
+    [Fact]
+    public async Task HandleWebhook_ValidHash_SUCCESS_ReturnsOk_Finished()
+    {
+        var mock = new Mock<IHotPayServiceCaller>();
+        mock.Setup(m => m.VerifyNotification("abc123", "99.99", "PAY_001", "SUCCESS")).Returns(true);
+
+        var request = new PaymentWebhookRequest
+        {
+            Query = new Dictionary<string, StringValues>
+            {
+                { "HASH",         "abc123"  },
+                { "KWOTA",        "99.99"   },
+                { "ID_PLATNOSCI", "PAY_001" },
+                { "STATUS",       "SUCCESS" },
+            },
+        };
+        var result = await Build(mock.Object).HandleWebhookAsync(request);
+
+        Assert.True(result.Success);
+        Assert.False(result.Ignored);
+        Assert.Equal(PaymentStatusEnum.Finished, result.PaymentResponse!.PaymentStatus);
+        Assert.Equal("PAY_001", result.PaymentResponse!.PaymentUniqueId);
+    }
+
+    [Fact]
+    public async Task HandleWebhook_ValidHash_FAILURE_ReturnsOk_Rejected()
+    {
+        var mock = new Mock<IHotPayServiceCaller>();
+        mock.Setup(m => m.VerifyNotification("abc123", "99.99", "PAY_001", "FAILURE")).Returns(true);
+
+        var request = new PaymentWebhookRequest
+        {
+            Query = new Dictionary<string, StringValues>
+            {
+                { "HASH",         "abc123"  },
+                { "KWOTA",        "99.99"   },
+                { "ID_PLATNOSCI", "PAY_001" },
+                { "STATUS",       "FAILURE" },
+            },
+        };
+        var result = await Build(mock.Object).HandleWebhookAsync(request);
+
+        Assert.True(result.Success);
+        Assert.False(result.Ignored);
+        Assert.Equal(PaymentStatusEnum.Rejected, result.PaymentResponse!.PaymentStatus);
+    }
+
+    [Fact]
+    public async Task HandleWebhook_InvalidHash_ReturnsFail()
+    {
+        var mock = new Mock<IHotPayServiceCaller>();
+        mock.Setup(m => m.VerifyNotification(It.IsAny<string>(), It.IsAny<string>(), It.IsAny<string>(), It.IsAny<string>())).Returns(false);
+
+        var request = new PaymentWebhookRequest
+        {
+            Query = new Dictionary<string, StringValues>
+            {
+                { "HASH",         "bad"     },
+                { "KWOTA",        "99.99"   },
+                { "ID_PLATNOSCI", "PAY_001" },
+                { "STATUS",       "SUCCESS" },
+            },
+        };
+        var result = await Build(mock.Object).HandleWebhookAsync(request);
+
+        Assert.False(result.Success);
+        Assert.NotNull(result.ErrorMessage);
+    }
+}
+
+// ─── PayNow ──────────────────────────────────────────────────────────────────
+
+public class PayNowWebhookTests
+{
+    private static PayNowProvider Build(IPayNowServiceCaller caller) => new(caller);
+
+    [Fact]
+    public async Task HandleWebhook_ValidSignature_CONFIRMED_ReturnsOk_Finished()
+    {
+        var body = """{"paymentId":"pn_1","status":"CONFIRMED"}""";
+        var mock = new Mock<IPayNowServiceCaller>();
+        mock.Setup(m => m.VerifySignature(body, "sig_val")).Returns(true);
+
+        var request = new PaymentWebhookRequest
+        {
+            Body = body,
+            Headers = new Dictionary<string, StringValues> { { "Signature", "sig_val" } },
+        };
+        var result = await Build(mock.Object).HandleWebhookAsync(request);
+
+        Assert.True(result.Success);
+        Assert.False(result.Ignored);
+        Assert.Equal(PaymentStatusEnum.Finished, result.PaymentResponse!.PaymentStatus);
+    }
+
+    [Fact]
+    public async Task HandleWebhook_ValidSignature_REJECTED_ReturnsOk_Rejected()
+    {
+        var body = """{"paymentId":"pn_1","status":"REJECTED"}""";
+        var mock = new Mock<IPayNowServiceCaller>();
+        mock.Setup(m => m.VerifySignature(body, "sig_val")).Returns(true);
+
+        var request = new PaymentWebhookRequest
+        {
+            Body = body,
+            Headers = new Dictionary<string, StringValues> { { "Signature", "sig_val" } },
+        };
+        var result = await Build(mock.Object).HandleWebhookAsync(request);
+
+        Assert.True(result.Success);
+        Assert.False(result.Ignored);
+        Assert.Equal(PaymentStatusEnum.Rejected, result.PaymentResponse!.PaymentStatus);
+    }
+
+    [Fact]
+    public async Task HandleWebhook_InvalidSignature_ReturnsFail()
+    {
+        var mock = new Mock<IPayNowServiceCaller>();
+        mock.Setup(m => m.VerifySignature(It.IsAny<string>(), It.IsAny<string>())).Returns(false);
+
+        var result = await Build(mock.Object).HandleWebhookAsync(new PaymentWebhookRequest
+        {
+            Body = """{"status":"CONFIRMED"}""",
+            Headers = new Dictionary<string, StringValues> { { "Signature", "bad" } },
+        });
+
+        Assert.False(result.Success);
+        Assert.NotNull(result.ErrorMessage);
+    }
+
+    [Fact]
+    public async Task HandleWebhook_ValidSignature_PENDING_ReturnsIgnore()
+    {
+        var body = """{"paymentId":"pn_1","status":"PENDING"}""";
+        var mock = new Mock<IPayNowServiceCaller>();
+        mock.Setup(m => m.VerifySignature(body, "sig_val")).Returns(true);
+
+        var request = new PaymentWebhookRequest
+        {
+            Body = body,
+            Headers = new Dictionary<string, StringValues> { { "Signature", "sig_val" } },
+        };
+        var result = await Build(mock.Object).HandleWebhookAsync(request);
+
+        Assert.True(result.Success);
+        Assert.True(result.Ignored);
+    }
+}
+
+// ─── PayU ────────────────────────────────────────────────────────────────────
+
+public class PayUWebhookTests
+{
+    private static PayUProvider Build(IPayUServiceCaller caller) => new(caller);
+
+    [Fact]
+    public async Task HandleWebhook_ValidSignature_COMPLETED_ReturnsOk_Finished()
+    {
+        var body = """{"order":{"orderId":"ord_1","status":"COMPLETED"}}""";
+        var mock = new Mock<IPayUServiceCaller>();
+        mock.Setup(m => m.VerifySignature(body, "sig_val")).Returns(true);
+
+        var request = new PaymentWebhookRequest
+        {
+            Body = body,
+            Headers = new Dictionary<string, StringValues> { { "OpenPayU-Signature", "sig_val" } },
+        };
+        var result = await Build(mock.Object).HandleWebhookAsync(request);
+
+        Assert.True(result.Success);
+        Assert.False(result.Ignored);
+        Assert.Equal(PaymentStatusEnum.Finished, result.PaymentResponse!.PaymentStatus);
+    }
+
+    [Fact]
+    public async Task HandleWebhook_ValidSignature_CANCELED_ReturnsOk_Rejected()
+    {
+        var body = """{"order":{"orderId":"ord_1","status":"CANCELED"}}""";
+        var mock = new Mock<IPayUServiceCaller>();
+        mock.Setup(m => m.VerifySignature(body, "sig_val")).Returns(true);
+
+        var request = new PaymentWebhookRequest
+        {
+            Body = body,
+            Headers = new Dictionary<string, StringValues> { { "OpenPayU-Signature", "sig_val" } },
+        };
+        var result = await Build(mock.Object).HandleWebhookAsync(request);
+
+        Assert.True(result.Success);
+        Assert.False(result.Ignored);
+        Assert.Equal(PaymentStatusEnum.Rejected, result.PaymentResponse!.PaymentStatus);
+    }
+
+    [Fact]
+    public async Task HandleWebhook_InvalidSignature_ReturnsFail()
+    {
+        var mock = new Mock<IPayUServiceCaller>();
+        mock.Setup(m => m.VerifySignature(It.IsAny<string>(), It.IsAny<string>())).Returns(false);
+
+        var result = await Build(mock.Object).HandleWebhookAsync(new PaymentWebhookRequest
+        {
+            Body = """{"order":{"status":"COMPLETED"}}""",
+            Headers = new Dictionary<string, StringValues> { { "OpenPayU-Signature", "bad" } },
+        });
+
+        Assert.False(result.Success);
+        Assert.NotNull(result.ErrorMessage);
+    }
+
+    [Fact]
+    public async Task HandleWebhook_ValidSignature_PENDING_ReturnsIgnore()
+    {
+        var body = """{"order":{"orderId":"ord_1","status":"PENDING"}}""";
+        var mock = new Mock<IPayUServiceCaller>();
+        mock.Setup(m => m.VerifySignature(body, "sig_val")).Returns(true);
+
+        var request = new PaymentWebhookRequest
+        {
+            Body = body,
+            Headers = new Dictionary<string, StringValues> { { "OpenPayU-Signature", "sig_val" } },
+        };
+        var result = await Build(mock.Object).HandleWebhookAsync(request);
+
+        Assert.True(result.Success);
+        Assert.True(result.Ignored);
+    }
+}
+
+// ─── Przelewy24 ──────────────────────────────────────────────────────────────
+
+public class Przelewy24WebhookTests
+{
+    private static Przelewy24Provider Build(IPrzelewy24ServiceCaller caller)
+        => new(caller, Options.Create(new Przelewy24ServiceOptions()));
+
+    [Fact]
+    public async Task HandleWebhook_ValidSignature_VerifyOk_ReturnsOk_Finished()
+    {
+        var body = """{"sessionId":"sess_1","orderId":12345,"merchantId":100,"amount":1000,"currency":"PLN","sign":"abc"}""";
+        var mock = new Mock<IPrzelewy24ServiceCaller>();
+        mock.Setup(m => m.VerifyNotification(body)).Returns(true);
+        mock.Setup(m => m.VerifyTransactionAsync("sess_1", 1000, "PLN", 12345))
+            .ReturnsAsync(PaymentStatusEnum.Finished);
+
+        var request = new PaymentWebhookRequest { Body = body };
+        var result = await Build(mock.Object).HandleWebhookAsync(request);
+
+        Assert.True(result.Success);
+        Assert.False(result.Ignored);
+        Assert.Equal(PaymentStatusEnum.Finished, result.PaymentResponse!.PaymentStatus);
+    }
+
+    [Fact]
+    public async Task HandleWebhook_ValidSignature_VerifyFails_ReturnsOk_Rejected()
+    {
+        var body = """{"sessionId":"sess_1","orderId":12345,"merchantId":100,"amount":1000,"currency":"PLN","sign":"abc"}""";
+        var mock = new Mock<IPrzelewy24ServiceCaller>();
+        mock.Setup(m => m.VerifyNotification(body)).Returns(true);
+        mock.Setup(m => m.VerifyTransactionAsync("sess_1", 1000, "PLN", 12345))
+            .ReturnsAsync(PaymentStatusEnum.Rejected);
+
+        var request = new PaymentWebhookRequest { Body = body };
+        var result = await Build(mock.Object).HandleWebhookAsync(request);
+
+        Assert.True(result.Success);
+        Assert.False(result.Ignored);
+        Assert.Equal(PaymentStatusEnum.Rejected, result.PaymentResponse!.PaymentStatus);
+    }
+
+    [Fact]
+    public async Task HandleWebhook_InvalidSignature_ReturnsFail()
+    {
+        var body = """{"sessionId":"sess_1","orderId":12345,"merchantId":100,"amount":1000,"currency":"PLN","sign":"bad"}""";
+        var mock = new Mock<IPrzelewy24ServiceCaller>();
+        mock.Setup(m => m.VerifyNotification(body)).Returns(false);
+
+        var result = await Build(mock.Object).HandleWebhookAsync(new PaymentWebhookRequest { Body = body });
+
+        Assert.False(result.Success);
+        Assert.NotNull(result.ErrorMessage);
+    }
+}
+
+// ─── Revolut ─────────────────────────────────────────────────────────────────
+
+public class RevolutWebhookTests
+{
+    private static RevolutProvider Build(IRevolutServiceCaller caller) => new(caller);
+
+    [Fact]
+    public async Task HandleWebhook_ValidSignature_ORDER_COMPLETED_ReturnsOk_Finished()
+    {
+        var body = """{"event":"ORDER_COMPLETED","order":{"id":"rev_1","state":"completed"}}""";
+        var mock = new Mock<IRevolutServiceCaller>();
+        mock.Setup(m => m.VerifyWebhookSignature(body, "ts_123", "v1=hexhex")).Returns(true);
+
+        var request = new PaymentWebhookRequest
+        {
+            Body = body,
+            Headers = new Dictionary<string, StringValues>
+            {
+                { "Revolut-Request-Timestamp", "ts_123"    },
+                { "Revolut-Signature",         "v1=hexhex" },
+            },
+        };
+        var result = await Build(mock.Object).HandleWebhookAsync(request);
+
+        Assert.True(result.Success);
+        Assert.False(result.Ignored);
+        Assert.Equal(PaymentStatusEnum.Finished, result.PaymentResponse!.PaymentStatus);
+    }
+
+    [Fact]
+    public async Task HandleWebhook_ValidSignature_ORDER_CANCELLED_ReturnsOk_Rejected()
+    {
+        var body = """{"event":"ORDER_CANCELLED","order":{"id":"rev_1"}}""";
+        var mock = new Mock<IRevolutServiceCaller>();
+        mock.Setup(m => m.VerifyWebhookSignature(body, "ts_123", "v1=hexhex")).Returns(true);
+
+        var request = new PaymentWebhookRequest
+        {
+            Body = body,
+            Headers = new Dictionary<string, StringValues>
+            {
+                { "Revolut-Request-Timestamp", "ts_123"    },
+                { "Revolut-Signature",         "v1=hexhex" },
+            },
+        };
+        var result = await Build(mock.Object).HandleWebhookAsync(request);
+
+        Assert.True(result.Success);
+        Assert.False(result.Ignored);
+        Assert.Equal(PaymentStatusEnum.Rejected, result.PaymentResponse!.PaymentStatus);
+    }
+
+    [Fact]
+    public async Task HandleWebhook_InvalidSignature_ReturnsFail()
+    {
+        var mock = new Mock<IRevolutServiceCaller>();
+        mock.Setup(m => m.VerifyWebhookSignature(It.IsAny<string>(), It.IsAny<string>(), It.IsAny<string>())).Returns(false);
+
+        var result = await Build(mock.Object).HandleWebhookAsync(new PaymentWebhookRequest
+        {
+            Body = """{"event":"ORDER_COMPLETED"}""",
+            Headers = new Dictionary<string, StringValues>
+            {
+                { "Revolut-Request-Timestamp", "ts_123" },
+                { "Revolut-Signature",         "bad"    },
+            },
+        });
+
+        Assert.False(result.Success);
+        Assert.NotNull(result.ErrorMessage);
+    }
+
+    [Fact]
+    public async Task HandleWebhook_ValidSignature_UnknownEvent_ReturnsIgnore()
+    {
+        var body = """{"event":"ORDER_AUTHORISED","order":{"id":"rev_1"}}""";
+        var mock = new Mock<IRevolutServiceCaller>();
+        mock.Setup(m => m.VerifyWebhookSignature(body, "ts_123", "v1=hexhex")).Returns(true);
+
+        var request = new PaymentWebhookRequest
+        {
+            Body = body,
+            Headers = new Dictionary<string, StringValues>
+            {
+                { "Revolut-Request-Timestamp", "ts_123"    },
+                { "Revolut-Signature",         "v1=hexhex" },
+            },
+        };
+        var result = await Build(mock.Object).HandleWebhookAsync(request);
+
+        Assert.True(result.Success);
+        Assert.True(result.Ignored);
+    }
+}
+
+// ─── Tpay ────────────────────────────────────────────────────────────────────
+
+public class TpayWebhookTests
+{
+    private static TpayProvider Build(ITpayServiceCaller caller) => new(caller);
+
+    [Fact]
+    public async Task HandleWebhook_ValidSignature_paid_ReturnsOk_Finished()
+    {
+        var body = """{"id":"tpay_1","status":"paid"}""";
+        var mock = new Mock<ITpayServiceCaller>();
+        mock.Setup(m => m.VerifyNotification(body, "sig_val")).Returns(true);
+
+        var request = new PaymentWebhookRequest
+        {
+            Body = body,
+            Headers = new Dictionary<string, StringValues> { { "X-Signature", "sig_val" } },
+        };
+        var result = await Build(mock.Object).HandleWebhookAsync(request);
+
+        Assert.True(result.Success);
+        Assert.False(result.Ignored);
+        Assert.Equal(PaymentStatusEnum.Finished, result.PaymentResponse!.PaymentStatus);
+    }
+
+    [Fact]
+    public async Task HandleWebhook_ValidSignature_error_ReturnsOk_Rejected()
+    {
+        var body = """{"id":"tpay_1","status":"error"}""";
+        var mock = new Mock<ITpayServiceCaller>();
+        mock.Setup(m => m.VerifyNotification(body, "sig_val")).Returns(true);
+
+        var request = new PaymentWebhookRequest
+        {
+            Body = body,
+            Headers = new Dictionary<string, StringValues> { { "X-Signature", "sig_val" } },
+        };
+        var result = await Build(mock.Object).HandleWebhookAsync(request);
+
+        Assert.True(result.Success);
+        Assert.False(result.Ignored);
+        Assert.Equal(PaymentStatusEnum.Rejected, result.PaymentResponse!.PaymentStatus);
+    }
+
+    [Fact]
+    public async Task HandleWebhook_InvalidSignature_ReturnsFail()
+    {
+        var mock = new Mock<ITpayServiceCaller>();
+        mock.Setup(m => m.VerifyNotification(It.IsAny<string>(), It.IsAny<string>())).Returns(false);
+
+        var result = await Build(mock.Object).HandleWebhookAsync(new PaymentWebhookRequest
+        {
+            Body = """{"status":"paid"}""",
+            Headers = new Dictionary<string, StringValues> { { "X-Signature", "bad" } },
+        });
+
+        Assert.False(result.Success);
+        Assert.NotNull(result.ErrorMessage);
+    }
+
+    [Fact]
+    public async Task HandleWebhook_ValidSignature_pending_ReturnsIgnore()
+    {
+        var body = """{"id":"tpay_1","status":"pending"}""";
+        var mock = new Mock<ITpayServiceCaller>();
+        mock.Setup(m => m.VerifyNotification(body, "sig_val")).Returns(true);
+
+        var request = new PaymentWebhookRequest
+        {
+            Body = body,
+            Headers = new Dictionary<string, StringValues> { { "X-Signature", "sig_val" } },
+        };
+        var result = await Build(mock.Object).HandleWebhookAsync(request);
+
+        Assert.True(result.Success);
+        Assert.True(result.Ignored);
+    }
+}
diff --git a/tests/TailoredApps.Shared.Payments.Tests/coverage.net10.0.json b/tests/TailoredApps.Shared.Payments.Tests/coverage.net10.0.json
new file mode 100644
index 0000000..206ac98
--- /dev/null
+++ b/tests/TailoredApps.Shared.Payments.Tests/coverage.net10.0.json
@@ -0,0 +1,10124 @@
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+}
\ No newline at end of file
diff --git a/tests/TailoredApps.Shared.Payments.Tests/coverage/coverage.net10.0.json b/tests/TailoredApps.Shared.Payments.Tests/coverage/coverage.net10.0.json
new file mode 100644
index 0000000..05b4615
--- /dev/null
+++ b/tests/TailoredApps.Shared.Payments.Tests/coverage/coverage.net10.0.json
@@ -0,0 +1,10124 @@
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+}
\ No newline at end of file