Transactions.php

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<?php
namespace Magento\Sales\Controller\Adminhtml;

use Magento\Backend\App\Action;
use Magento\Framework\Registry;
use Magento\Framework\View\Result\PageFactory;
use Magento\Framework\View\Result\LayoutFactory;
use Magento\Sales\Api\OrderPaymentRepositoryInterface;

abstract class Transactions extends \Magento\Backend\App\Action
{
    const ADMIN_RESOURCE = 'Magento_Sales::transactions';

    protected $_coreRegistry = null;

    protected $resultPageFactory;

    protected $resultLayoutFactory;

    protected $orderPaymentRepository;

    public function __construct(
        \Magento\Backend\App\Action\Context $context,
        Registry $coreRegistry,
        PageFactory $resultPageFactory,
        LayoutFactory $resultLayoutFactory,
        OrderPaymentRepositoryInterface $orderPaymentRepository
    ) {
        $this->_coreRegistry = $coreRegistry;
        $this->resultPageFactory = $resultPageFactory;
        $this->resultLayoutFactory = $resultLayoutFactory;
        $this->orderPaymentRepository = $orderPaymentRepository;
        parent::__construct($context);
    }

    protected function _initTransaction()
    {
        $txn = $this->_objectManager->create(
            \Magento\Sales\Model\Order\Payment\Transaction::class
        )->load(
            $this->getRequest()->getParam('txn_id')
        );

        if (!$txn->getId()) {
            $this->messageManager->addErrorMessage(__('Please correct the transaction ID and try again.'));
            $this->_actionFlag->set('', self::FLAG_NO_DISPATCH, true);
            return false;
        }
        $orderId = $this->getRequest()->getParam('order_id');
        if ($orderId) {
            $txn->setOrderUrl($this->getUrl('sales/order/view', ['order_id' => $orderId]));
        }

        $this->_coreRegistry->register('current_transaction', $txn);
        return $txn;
    }
}