diff --git a/README.md b/README.md
index d74d596..5cc2bae 100644
--- a/README.md
+++ b/README.md
@@ -22,7 +22,79 @@ Or install it yourself as:
 
 ## Usage
 
-TODO: Write usage instructions here
+### INIT:
+```
+PactasItero.client_id = "my_billwerk_client_id"
+PactasItero.client_secret = "my_billwerk_client_secret"
+@billwerkClient = PactasItero.client
+@billwerkClient.bearer_token = @billwerkClient.try(:token).try(:access_token)
+```
+
+### Examples:
+
+#### 1) Create-Plan Example
+
+```
+plangroup_id = "16dc8c7gba5c2202143de8b5"
+plan_options={}
+plan_options[:Name] = {"_c" => "Package XXL" }
+plan_options[:PlanDescription] = {"_c"=>"This is the Plan-Description for XXL"}
+plan_options[:PlanGroupId] = plangroup_id
+plan_options[:SetupDescription] = {"_c"=>"one-time setup-fee"}
+plan_options[:TrialEndNotificationPeriod] = {'Unit' => "Day", 'Quantity' => 3}
+plan_options[:TrialEndPolicy] = "RequestPayment"
+plan_options[:TrialPeriod] = {:Unit => "Day", :Quantity => 7}  
+plan_options[:IsQuantityBased] = false
+plan_options[:Hidden] = false
+plan_options[:IsDeletable] = false
+@plan=@billwerkClient.create_plan(plangroup_id,plan_options)
+```
+
+#### 2) Create-Order Example   
+
+##### Submitted via Order-Form (Example Data)
+
+```
+Parameters: {"Cart"=>{"PlanVariantId"=>"19dc8c7gba5c2202143de1s9"}, 
+	"Customer"=>{"CompanyName"=>"Mustermann Ltd.", "EmailAddress"=>"mustermann@test.de", "FirstName"=>"Klaus", "LastName"=>"Mustermann", "VatId"=>"DE63244715",
+	"Address"=>{"Street"=>"Karl-Str.", "HouseNumber"=>"55", "PostalCode"=>"10421", "City"=>"Berlin", "Country"=>"DE"}}, 
+	"Bearer"=>{"holder"=>"Mustermann Ltd", "iban"=>"DE883299699663", "bic"=>"HAC556AXXX"}}
+```
+
+##### Usage in Order-Controller 
+
+```
+orderOptions = {}
+orderOptions[:ContractCustomFields] = {}
+orderOptions[:AdditionalData] = {}
+orderOptions[:AdditionalData][:Contract] = {}
+orderOptions[:AdditionalData][:Contract][:CustomFields]  = {}
+orderOptions[:Cart] = params[:Cart].to_h
+orderOptions[:Cart][:Quantity] = 1
+orderOptions[:Cart][:EnableTrial] = true
+orderOptions[:Cart][:ComponentSubscriptions] = []
+orderOptions[:Cart][:MeteredUsages] = []
+orderOptions[:Cart][:DiscountSubscriptions] = []
+orderOptions[:Cart][:RatedItems] = []
+orderOptions[:Customer] = params[:Customer].to_h
+orderOptions[:Customer][:ExternalCustomerId] = "#{current_customer.id}"
+orderOptions[:Customer][:Language] = 'de-DE';
+orderOptions[:Customer][:Locale] = 'de-DE';
+orderOptions[:Customer][:DebitorAccount] = "#{current_customer.debit_id}"
+orderOptions[:Customer][:Hidden] = false
+orderOptions[:StartDate] = Time.now.to_formatted_s(:iso8601)    
+@order=@billwerkClient.create_order(orderOptions)  
+```
+
+##### On Success Commit-Order via Order-Controller 
+
+```
+commitOptions = {}
+commitOptions[:PaymentMethod] = "Debit:FakeProvider"
+commitOptions[:Bearer] = params[:Bearer].to_h
+commitOptions[:Bearer][:mandatereference] = "Z-#{current_customer.debit_id}-#{current_customer.id}"
+@commit = @billwerkClient.commit_order(@order.id, commitOptions)
+```    
 
 ## Contributing
 
diff --git a/lib/pactas_itero/api.rb b/lib/pactas_itero/api.rb
index 3a9c14a..05a043e 100644
--- a/lib/pactas_itero/api.rb
+++ b/lib/pactas_itero/api.rb
@@ -6,6 +6,10 @@
 require 'pactas_itero/api/orders'
 require 'pactas_itero/api/invoices'
 require "pactas_itero/api/payment_transactions"
+require "pactas_itero/api/plans"
+require "pactas_itero/api/coupons"
+require "pactas_itero/api/discounts"
+require "pactas_itero/api/components"
 
 module PactasItero
   module Api
@@ -16,5 +20,9 @@ module Api
     include PactasItero::Api::Orders
     include PactasItero::Api::Invoices
     include PactasItero::Api::PaymentTransactions
+    include PactasItero::Api::Plans
+    include PactasItero::Api::Coupons
+    include PactasItero::Api::Discounts
+    include PactasItero::Api::Components
   end
 end
diff --git a/lib/pactas_itero/api/components.rb b/lib/pactas_itero/api/components.rb
new file mode 100644
index 0000000..aab957b
--- /dev/null
+++ b/lib/pactas_itero/api/components.rb
@@ -0,0 +1,26 @@
+module PactasItero
+  module Api
+    module Components
+      def components(options = {})
+        options = options.camelize_keys
+        get "api/v1/components", options
+      end
+
+      def component(component_id, options = {})
+        options = options.camelize_keys
+        get "api/v1/components/#{component_id}", options
+      end
+      
+      def create_component(plangroup_id, options = {})
+        options = options.camelize_keys
+        post "api/v1/planGroups/#{plangroup_id}/components", options
+      end
+
+      def update_component(component_id, options = {})
+        options = options.camelize_keys
+        patch "api/v1/components/#{component_id}", options
+      end
+
+    end
+  end
+end
\ No newline at end of file
diff --git a/lib/pactas_itero/api/contracts.rb b/lib/pactas_itero/api/contracts.rb
index 0fe8fde..f2e7e1f 100644
--- a/lib/pactas_itero/api/contracts.rb
+++ b/lib/pactas_itero/api/contracts.rb
@@ -35,6 +35,32 @@ def terminate_contract(contract_id, options = {})
         options = options.camelize_keys
         post "api/v1/contracts/#{contract_id}/end", options
       end
+      
+      def annulate_contract(contract_id, options = {})
+        options = options.camelize_keys
+        post "api/v1/contracts/#{contract_id}/annulate", options
+      end
+
+      def ledger_entries_for_contract(contract_id, options = {})
+        options = options.camelize_keys
+        get "api/v1/contracts/#{contract_id}/ledgerEntries", options
+      end
+
+      def change_payment_method_for_contract(contract_id, options = {})
+        options = options.camelize_keys
+        post "api/v1/contracts/#{contract_id}/changepaymentmethod", options
+      end
+
+      def component_usage_for_contract(contract_id, options = {})
+        options = options.camelize_keys
+        post "api/v1/contracts/#{contract_id}/usage", options
+      end
+
+      def subscribe_component_for_contract(contract_id, options = {})
+        options = options.camelize_keys
+        post "api/v1/contracts/#{contract_id}/componentsubscriptions", options
+      end
+
     end
   end
 end
diff --git a/lib/pactas_itero/api/coupons.rb b/lib/pactas_itero/api/coupons.rb
new file mode 100644
index 0000000..251340b
--- /dev/null
+++ b/lib/pactas_itero/api/coupons.rb
@@ -0,0 +1,31 @@
+module PactasItero
+  module Api
+    module Coupons
+      def coupons(options = {})
+        options = options.camelize_keys
+        get "api/v1/coupons", options
+      end
+
+      def coupon(coupon_id, options = {})
+        options = options.camelize_keys
+        get "api/v1/coupons/#{coupon_id}", options
+      end
+      
+      def create_coupon(plangroup_id, options = {})
+        options = options.camelize_keys
+        post "api/v1/planGroups/#{plangroup_id}/coupons", options
+      end
+
+      def update_coupon(coupon_id, options = {})
+        options = options.camelize_keys
+        patch "api/v1/coupons/#{coupon_id}", options
+      end
+      
+      def coupon_by_code(coupon_code, options = {})
+        options = options.camelize_keys
+        get "api/v1/coupons/?couponCode=#{coupon_code}&active=true", options
+      end
+
+    end
+  end
+end
\ No newline at end of file
diff --git a/lib/pactas_itero/api/customers.rb b/lib/pactas_itero/api/customers.rb
index 1c1f17d..4599fcd 100644
--- a/lib/pactas_itero/api/customers.rb
+++ b/lib/pactas_itero/api/customers.rb
@@ -20,6 +20,11 @@ def update_customer(customer_id, options = {})
         options = options.camelize_keys
         patch "api/v1/customers/#{customer_id}", options
       end
+
+      def search_customer(search_string, options = {})
+        options = options.camelize_keys
+        get "api/v1/customers/?search=#{search_string}", options
+      end
     end
   end
 end
diff --git a/lib/pactas_itero/api/discounts.rb b/lib/pactas_itero/api/discounts.rb
new file mode 100644
index 0000000..3ac9b2b
--- /dev/null
+++ b/lib/pactas_itero/api/discounts.rb
@@ -0,0 +1,26 @@
+module PactasItero
+  module Api
+    module Discounts
+      def discounts(options = {})
+        options = options.camelize_keys
+        get "api/v1/Discounts", options
+      end
+
+      def discount(discount_id, options = {})
+        options = options.camelize_keys
+        get "api/v1/Discounts/#{discount_id}", options
+      end
+      
+      def create_discount(plangroup_id, options = {})
+        options = options.camelize_keys
+        post "api/v1/planGroups/#{plangroup_id}/discounts", options
+      end
+
+      def update_discount(discount_id, options = {})
+        options = options.camelize_keys
+        patch "api/v1/discount/#{discount_id}", options
+      end
+
+    end
+  end
+end
\ No newline at end of file
diff --git a/lib/pactas_itero/api/plans.rb b/lib/pactas_itero/api/plans.rb
new file mode 100644
index 0000000..ebc3a8a
--- /dev/null
+++ b/lib/pactas_itero/api/plans.rb
@@ -0,0 +1,50 @@
+module PactasItero
+  module Api
+    module Plans
+      def plans(options = {})
+        options = options.camelize_keys
+        get "api/v1/Plans", options
+      end
+
+      def plan(plan_id, options = {})
+        options = options.camelize_keys
+        get "api/v1/plans/#{plan_id}", options
+      end
+
+      def create_plan(plangroup_id, options = {})
+        options = options.camelize_keys
+        post "api/v1/planGroups/#{plangroup_id}/plans", options
+      end
+
+      def update_plan(plan_id, options = {})
+        options = options.camelize_keys
+        patch "api/v1/plans/#{plan_id}", options
+      end
+
+      def plan_variants(options = {})
+        options = options.camelize_keys
+        get "api/v1/planvariants", options
+      end
+
+      def plan_variant(planvariant_id, options = {})
+        options = options.camelize_keys
+        get "api/v1/planvariants/#{planvariant_id}", options
+      end
+
+      def create_plan_variant(plan_id, options = {})
+        options = options.camelize_keys
+        post "api/v1/plans/#{plan_id}/planvariants", options
+      end
+
+      def update_plan_variant(planvariant_id, options = {})
+        options = options.camelize_keys
+        patch "api/v1/planvariants/#{planvariant_id}", options
+      end
+
+      def plan_variants_for_plan(plan_id, options = {})
+        options = options.camelize_keys
+        get "api/v1/plans/#{plan_id}/planvariants", options
+      end
+    end
+  end
+end
\ No newline at end of file
diff --git a/lib/pactas_itero/client.rb b/lib/pactas_itero/client.rb
index 708a132..ca4c372 100644
--- a/lib/pactas_itero/client.rb
+++ b/lib/pactas_itero/client.rb
@@ -75,6 +75,7 @@ def request(method, path, params = {})
     def connection_options
       @connection_options ||= {
         :builder => middleware,
+        :ssl => {verify_mode: OpenSSL::SSL::VERIFY_NONE},
         :headers => {
           :accept => default_media_type,
           :user_agent => user_agent,
diff --git a/lib/pactas_itero/ext/hash/camelize_keys.rb b/lib/pactas_itero/ext/hash/camelize_keys.rb
index 8ce8dbb..b1d8fc8 100644
--- a/lib/pactas_itero/ext/hash/camelize_keys.rb
+++ b/lib/pactas_itero/ext/hash/camelize_keys.rb
@@ -24,9 +24,14 @@ def camelize_key(key)
   end
 
   # copied from ActiveSupport
+  # do not camelize exact "_c"
   def camelize(term)
     string = term.to_s
-    string = string.sub(/^[a-z\d]*/) { $&.capitalize }
-    string.gsub(/(?:_|(\/))([a-z\d]*)/) { "#{$1}#{$2.capitalize}" }.gsub('/', '::')
+    if (string.downcase == '_c')
+      string
+    else
+      string = string.sub(/^[a-z\d]*/) { $&.capitalize }
+      string.gsub(/(?:_|(\/))([a-z\d]*)/) { "#{$1}#{$2.capitalize}" }.gsub('/', '::')
+    end
   end
 end