/**
  * @param Payone_TransactionStatus_Request_Interface $request
  * @return bool
  * @throws Payone_TransactionStatus_Exception_MissmatchingKeys
  */
 public function validateRequest(Payone_TransactionStatus_Request_Interface $request)
 {
     if ($request->getKey() !== $this->getKey()) {
         throw new Payone_TransactionStatus_Exception_MissmatchingKeys();
     }
     return true;
 }