src/Client.php
public function cancelPayment($paymentToken, $reason = null)
    {
        if (!$paymentToken instanceof CancelPaymentRequest) {
            $paymentToken = new CancelPaymentRequest($paymentToken);
        }

        if ($reason !== null) {
            $paymentToken->setReason($reason);
        }

        ObjectRecursiveValidator::validate($paymentToken);
        $paymentSerializer = new CancelPaymentSerializer($paymentToken);
        $paymentTransport = new CancelPaymentTransport($paymentSerializer);

        return $this->execute($paymentTransport, CancelPaymentResponse::class);
    }
public function cancelPayment($paymentToken, $reason = null)
    {
        if (!$paymentToken instanceof CancelPaymentRequest) {
            $paymentToken = new CancelPaymentRequest($paymentToken);
        }

        if ($reason !== null) {
            $paymentToken->setReason($reason);
        }

        ObjectRecursiveValidator::validate($paymentToken);
        $paymentSerializer = new CancelPaymentSerializer($paymentToken);
        $paymentTransport = new CancelPaymentTransport($paymentSerializer);

        return $this->execute($paymentTransport, CancelPaymentResponse::class);
    }
@param string|CancelPaymentRequest $paymentToken
@param string|null                 $reason

@return CancelPaymentResponse|AbstractResponse

@throws ResponseException
@throws TransportException
@throws ResponseParseException
@throws JsonParseException