Update checksum models

README.md

@@ -8,11 +8,20 @@ VERSIONING
 
 This wrapper is using the api v2.1 launched in June 2014. If you wish to use the old api v2.0 please use the wrapper in branch v2: https://github.com/paymill/paymill-php/tree/v2.
 
-How to test
------------
+How to test cards and errors
+----------------------------
 
 There are different credit card numbers, frontend and backend error codes, which can be used for testing. For more information, please read our testing reference. https://www.paymill.com/en-gb/documentation-3/reference/testing/
 
+How to run unit and integration tests
+-------------------------------------
+Just run:
+
+```
+ant test
+```
+
+
 Getting started with PAYMILL
 ----------------------------
 
@@ -140,6 +149,13 @@ Changelog
 
 -	bugfix: [#92](https://github.com/paymill/paymill-php/pull/92) remove typecheck for http response code
 
+#### 4.0.0
+
+- Added shipping and billing address
+- Added shopping cart (items)
+-	Added PayPal functionality
+-	Possible [BC break in ResponseHandler.php](https://github.com/paymill/paymill-php/pull/102#discussion_r32232137)
+
 Documentation
 -------------
 

lib/Paymill/API/Curl.php

@@ -105,13 +105,15 @@ public function requestApi($action = '', $params = array(), $method = 'POST')
             return $responseBody;
         }
 
-        return array(
+        $result = array(
             'header' => array(
                 'status' => $responseInfo['http_code'],
                 'reason' => null,
             ),
             'body' => $responseBody
         );
+
+        return $result;
     }
 
     /**