diff --git a/CHANGELOG.md b/CHANGELOG.md
index d93803b..0cb86c1 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,9 @@
 # Changelog
 All notable changes to this project will be documented in this file.
 
+## [3.1.12]
+- Added `AuthorisationCode` field to `Transaction` in API response
+
 ## [3.1.11]
 - Added `Schemes` element to `Terminal` in `/getTerminals` API response, carrying the per-terminal supported card schemes and dual-brand pairs (`DualBrandPair` with `schemeA`, `schemeB`, `default` attributes)
 
diff --git a/build.gradle b/build.gradle
index 5a62a0a..143ed8b 100644
--- a/build.gradle
+++ b/build.gradle
@@ -9,7 +9,7 @@ plugins {
 }
 
 group = 'com.altapay'
-version = '3.1.11'
+version = '3.1.12'
 
 repositories {
     mavenCentral()
diff --git a/readme.md b/readme.md
index 09d1647..f4a23af 100644
--- a/readme.md
+++ b/readme.md
@@ -49,12 +49,12 @@ For integrating Java projects with the AltaPay gateway.
     <dependency>
         <groupId>com.altapay</groupId>
         <artifactId>sdk-java</artifactId>
-        <version>3.1.9</version>
+        <version>3.1.12</version>
     </dependency>
 
 ### Gradle
 
-    implementation 'com.altapay:sdk-java:3.1.9'
+    implementation 'com.altapay:sdk-java:3.1.12'
 
 ## Changelog
 
diff --git a/src/main/resources/xsd/APIResponse.xsd b/src/main/resources/xsd/APIResponse.xsd
index 7d8f1e1..9484c98 100644
--- a/src/main/resources/xsd/APIResponse.xsd
+++ b/src/main/resources/xsd/APIResponse.xsd
@@ -563,6 +563,7 @@
                     </xs:restriction>
                 </xs:simpleType>
             </xs:element>
+            <xs:element name="AuthorisationCode" type="xs:string" maxOccurs="1" minOccurs="0"/>
             <xs:element name="PaymentSchemeName" type="xs:string"
                         maxOccurs="1" minOccurs="0"/>
             <xs:element name="PaymentNatureService"