HtmlTransactionIdObserver.php

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<?php
namespace Magento\Paypal\Observer;

use Magento\Framework\Event\ObserverInterface;
use Magento\Framework\Event\Observer as EventObserver;

class HtmlTransactionIdObserver implements ObserverInterface
{
    private $paypalData;

    public function __construct(
        \Magento\Paypal\Helper\Data $paypalData
    ) {
        $this->paypalData = $paypalData;
    }

    public function execute(EventObserver $observer)
    {
        $transaction = $observer->getDataObject();
        $order = $transaction->getOrder();
        $payment = $order->getPayment();
        $methodInstance = $payment->getMethodInstance();
        $paymentCode = $methodInstance->getCode();
        $transactionLink = $this->paypalData->getHtmlTransactionId($paymentCode, $transaction->getTxnId());
        $transaction->setData('html_txn_id', $transactionLink);
    }
}