Payflow.php

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<?php
namespace Magento\Paypal\Controller;

abstract class Payflow extends \Magento\Framework\App\Action\Action
{
    protected $_checkoutSession;

    protected $_orderFactory;

    protected $_logger;

    protected $_payflowModelFactory;

    protected $_checkoutHelper;

    protected $_redirectBlockName = 'payflow.link.iframe';

    private $paymentFailures;

    public function __construct(
        \Magento\Framework\App\Action\Context $context,
        \Magento\Checkout\Model\Session $checkoutSession,
        \Magento\Sales\Model\OrderFactory $orderFactory,
        \Magento\Paypal\Model\PayflowlinkFactory $payflowModelFactory,
        \Magento\Paypal\Helper\Checkout $checkoutHelper,
        \Psr\Log\LoggerInterface $logger,
        \Magento\Sales\Api\PaymentFailuresInterface $paymentFailures = null
    ) {
        parent::__construct($context);

        $this->_checkoutSession = $checkoutSession;
        $this->_orderFactory = $orderFactory;
        $this->_logger = $logger;
        $this->_payflowModelFactory = $payflowModelFactory;
        $this->_checkoutHelper = $checkoutHelper;
        $this->paymentFailures = $paymentFailures ?: $this->_objectManager->get(
            \Magento\Sales\Api\PaymentFailuresInterface::class
        );
    }

    protected function _cancelPayment($errorMsg = '')
    {
        $errorMsg = trim(strip_tags($errorMsg));
        $order = $this->_checkoutSession->getLastRealOrder();
        if ($order->getId()) {
            $this->paymentFailures->handle((int)$order->getQuoteId(), $errorMsg);
        }

        $gotoSection = false;
        $this->_checkoutHelper->cancelCurrentOrder($errorMsg);
        if ($this->_checkoutSession->restoreQuote()) {
            //Redirect to payment step
            $gotoSection = 'paymentMethod';
        }

        return $gotoSection;
    }
}