Sonata\Component\Payment\TransactionInterface::getParameters PHP Method

    public function getParameters();

 /**
  * {@inheritdoc}
  */
 public function sendConfirmationReceipt(TransactionInterface $transaction)
 {
     $parameters = $transaction->getParameters();
     if (!array_key_exists('action', $parameters)) {
         throw new \RuntimeException('"action" parameter is missing from Transaction.');
     }
     switch ($parameters['action']) {
         case 'accept':
             $transaction->setState(TransactionInterface::STATE_OK);
             $transaction->setStatusCode(TransactionInterface::STATUS_VALIDATED);
             $transaction->getOrder()->setValidatedAt(new \DateTime());
             $transaction->getOrder()->setStatus(OrderInterface::STATUS_VALIDATED);
             $transaction->getOrder()->setPaymentStatus(TransactionInterface::STATUS_VALIDATED);
             return new Response('ok', 200, array('Content-Type' => 'text/plain'));
         case 'refuse':
             $transaction->setState(TransactionInterface::STATE_KO);
             $transaction->setStatusCode(TransactionInterface::STATUS_ERROR_VALIDATION);
             return false;
         default:
             $transaction->setState(TransactionInterface::STATE_KO);
             $transaction->setStatusCode(TransactionInterface::STATUS_ERROR_VALIDATION);
             return false;
     }
 }