Response Handler
Response Handler is the component of Magento payment provider gateway, that processes payment provider response. Typically, the response requires one of the following actions:
- Modify the order status
- Save information that was provided in a transaction response
- Send an email
The response handler only modifies the order state, based on the payment gateway response. It does not perform any other required actions.
Interface
Basic interface for a response handler is Magento\Payment\Gateway\Response\HandlerInterface
Useful implementations
\Magento\Payment\Gateway\Response\HandlerChain might be used as a basic container of response handlers, handling different parts.
Example
Example of a simple response handler (app/code/Magento/Braintree/Gateway/Response/PayPalDetailsHandler.php):
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class PayPalDetailsHandler implements HandlerInterface
{
const PAYMENT_ID = 'paymentId';
const PAYER_EMAIL = 'payerEmail';
/**
* @var SubjectReader
*/
private $subjectReader;
/**
* Constructor
*
* @param SubjectReader $subjectReader
*/
public function __construct(SubjectReader $subjectReader)
{
$this->subjectReader = $subjectReader;
}
/**
* @inheritdoc
*/
public function handle(array $handlingSubject, array $response)
{
$paymentDO = $this->subjectReader->readPayment($handlingSubject);
/** @var \Braintree\Transaction $transaction */
$transaction = $this->subjectReader->readTransaction($response);
/** @var OrderPaymentInterface $payment */
$payment = $paymentDO->getPayment();
$payPal = $this->subjectReader->readPayPal($transaction);
$payment->setAdditionalInformation(self::PAYMENT_ID, $payPal[self::PAYMENT_ID]);
$payment->setAdditionalInformation(self::PAYER_EMAIL, $payPal[self::PAYER_EMAIL]);
}
}
(the code sample is from Magento Open Source v2.1. Although the payment provider gateway was added in v2.0, the particular default implementation using the gateway were added in v2.1)