Issue #6 make cardReference availsble to notification response.

README.md

@@ -174,6 +174,14 @@ $notifyRequest = $gateway->acceptNotification();
 $notifyResponse = $notifyRequest->send();
 ```
 
+If `createCard` is set in the `$gateway` or `acceptNotification()`,
+then the reusable card token will be available in the notify response,
+along with the usual Omnipay methods:
+
+```php
+$notifyResponse->getCardReference()
+```
+
 Once the authorisation is complete, the amount still needs to be captured.
 
 #### Credit Card Authorize Notify

src/Message/CompleteRequest.php

@@ -88,6 +88,15 @@ public function sendData($data)
             }
         }
 
+        return $this->createResponse($data);
+    }
+
+    /**
+     * @param array $data
+     * @return CompleteResponse
+     */
+    public function createResponse(array $data)
+    {
         return $this->response = new CompleteResponse($this, $data);
     }
 

src/Message/NotificationRequest.php

@@ -14,14 +14,11 @@
 class NotificationRequest extends CompleteRequest
 {
     /**
-     * @throws InvalidRequestException
      * @param array $data
-     * @return CompleteAuthotizeResponse
+     * @return NotificationResponse
      */
-    public function sendData($data)
+    public function createResponse(array $data)
     {
-        $this->validateNotificationData($data);
-
         return $this->response = new NotificationResponse($this, $data);
     }
 }