Pro.php

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<?php
namespace Magento\Paypal\Model\Payflow;

class Pro extends \Magento\Paypal\Model\Pro
{
    protected $_apiType = \Magento\Paypal\Model\Api\PayflowNvp::class;

    protected $_configType = \Magento\Paypal\Model\Config::class;

    const TRANSPORT_PAYFLOW_TXN_ID = 'payflow_trxid';

    public function refund(\Magento\Framework\DataObject $payment, $amount)
    {
        $captureTxnId = $this->_getParentTransactionId($payment);
        if ($captureTxnId) {
            $api = $this->getApi();
            $api->setAuthorizationId($captureTxnId);
        }
        parent::refund($payment, $amount);
    }

    protected function _isCaptureNeeded()
    {
        return true;
    }

    protected function _getParentTransactionId(\Magento\Framework\DataObject $payment)
    {
        if ($payment->getParentTransactionId()) {
            return $this->transactionRepository->getByTransactionId(
                $payment->getParentTransactionId(),
                $payment->getId(),
                $payment->getOrder()->getId()
            )->getAdditionalInformation(
                self::TRANSPORT_PAYFLOW_TXN_ID
            );
        }
        return $payment->getParentTransactionId();
    }

    protected function _importCaptureResultToPayment($api, $payment)
    {
        $payment->setTransactionId(
            $api->getPaypalTransactionId()
        )->setIsTransactionClosed(
            false
        )->setTransactionAdditionalInfo(
            self::TRANSPORT_PAYFLOW_TXN_ID,
            $api->getTransactionId()
        );
        $payment->setPreparedMessage(__('Payflow PNREF: #%1.', $api->getTransactionId()));
        $this->_infoFactory->create()->importToPayment($api, $payment);
    }

    public function fetchTransactionInfo(\Magento\Payment\Model\InfoInterface $payment, $transactionId)
    {
        throw new \Magento\Framework\Exception\LocalizedException(
            __('Unable to fetch transaction details.')
        );
    }

    protected function _importRefundResultToPayment($api, $payment, $canRefundMore)
    {
        $payment->setTransactionId(
            $api->getPaypalTransactionId()
        )->setIsTransactionClosed(
            1 // refund initiated by merchant
        )->setShouldCloseParentTransaction(
            !$canRefundMore
        )->setTransactionAdditionalInfo(
            self::TRANSPORT_PAYFLOW_TXN_ID,
            $api->getTransactionId()
        );
        $payment->setPreparedMessage(__('Payflow PNREF: #%1.', $api->getTransactionId()));
        $this->_infoFactory->create()->importToPayment($api, $payment);
    }
}