newsupernova/vendor/magento/module-braintree/Gateway/Request/VoidDataBuilder.php

<?php
/**
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */
namespace Magento\Braintree\Gateway\Request;

use Magento\Braintree\Gateway\SubjectReader;
use Magento\Payment\Gateway\Request\BuilderInterface;
use Magento\Sales\Model\Order\Payment;

class VoidDataBuilder implements BuilderInterface
{
    /**
     * @var SubjectReader
     */
    private $subjectReader;

    /**
     * Constructor
     *
     * @param SubjectReader $subjectReader
     */
    public function __construct(SubjectReader $subjectReader)
    {
        $this->subjectReader = $subjectReader;
    }

    /**
     * Builds ENV request
     *
     * @param array $buildSubject
     * @return array
     */
    public function build(array $buildSubject)
    {
        $paymentDO = $this->subjectReader->readPayment($buildSubject);

        /** @var Payment $payment */
        $payment = $paymentDO->getPayment();

        return [
            'transaction_id' => $payment->getParentTransactionId()
                ?: $payment->getLastTransId()
        ];
    }
}