diff --git a/CHANGELOG.md b/CHANGELOG.md
index 384135b9..ba566f4a 100755
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,16 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/) and this project adheres
 to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
 
+## [3.12.0](https://github.com/unzerdev/php-sdk/compare/3.11.0..3.12.0)
+
+### Added
+
+* Add Styling properties for v2 Paypage `\UnzerSDK\Resources\V2\Paypage`:
+    * `basketBackgroundColor`
+    * `paymentFormBackgroundColor`
+* Add prototypes for v2 Customer: `\UnzerSDK\Resources\V2\Customer`.
+* Add prototypes for v3 Basket: `\UnzerSDK\Resources\V3\Basket`.
+
 ## [3.11.0](https://github.com/unzerdev/php-sdk/compare/3.10.0..3.11.0)
 
 ### Added
diff --git a/src/Resources/V2/Customer.php b/src/Resources/V2/Customer.php
index 4eedf6f1..528b1d76 100644
--- a/src/Resources/V2/Customer.php
+++ b/src/Resources/V2/Customer.php
@@ -6,6 +6,17 @@
 use UnzerSDK\Constants\ApiVersions;
 use UnzerSDK\Resources\Customer as CustomerV1;
 
+/**
+ *
+ * This is a prototype version of the v2 Customer resource.
+ *
+ * This class represents version 2 of Customer resource in the Unzer API.
+ * The version uses bearer authentication for API calls.
+ * Make sure to use the same Unzer instance to use the same JWT token across multiple calls.
+ * Also, the resource ID incorporates UUID and has a length of 42.
+ *
+ * @category prototype
+ */
 class Customer extends CustomerV1
 {
     public function getApiVersion(): string
@@ -17,6 +28,4 @@ public function getApiConfig(): string
     {
         return PaymentApiConfigBearerAuth::class;
     }
-
-
 }
\ No newline at end of file
diff --git a/src/Resources/V3/Basket.php b/src/Resources/V3/Basket.php
index 572164da..8c18c012 100644
--- a/src/Resources/V3/Basket.php
+++ b/src/Resources/V3/Basket.php
@@ -6,6 +6,16 @@
 use UnzerSDK\Constants\ApiVersions;
 use UnzerSDK\Resources\Basket as BasketV2;
 
+/**
+ * This is a prototype of the v3 Basket resource.
+ *
+ * This class represents version 3 of Basket resource in the Unzer API.
+ * The version uses bearer authentication for API calls.
+ * Make sure to use the same Unzer instance to use the same JWT token across multiple calls.
+ * Also, the resource ID incorporates UUID and has a length of 42.
+ *
+ * @category prototype
+ */
 class Basket extends BasketV2
 {
     public function __construct(
diff --git a/src/Unzer.php b/src/Unzer.php
index a8838776..bc3d88b3 100644
--- a/src/Unzer.php
+++ b/src/Unzer.php
@@ -58,7 +58,7 @@ class Unzer implements
     public const BASE_URL = 'api.unzer.com';
     public const API_VERSION = ApiVersions::V1;
     public const SDK_TYPE = 'UnzerPHP';
-    public const SDK_VERSION = '3.11.0';
+    public const SDK_VERSION = '3.12.0';
 
     /** @var string $key */
     private $key;