RefundDataBuilder.php

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<?php
namespace Magento\Braintree\Gateway\Request;

use Magento\Braintree\Gateway\SubjectReader;
use Magento\Payment\Gateway\Request\BuilderInterface;
use Magento\Payment\Helper\Formatter;
use Magento\Sales\Api\Data\TransactionInterface;
use Magento\Sales\Model\Order\Payment;

class RefundDataBuilder implements BuilderInterface
{
    use Formatter;

    private $subjectReader;

    public function __construct(SubjectReader $subjectReader)
    {
        $this->subjectReader = $subjectReader;
    }

    public function build(array $buildSubject)
    {
        $paymentDO = $this->subjectReader->readPayment($buildSubject);

        $payment = $paymentDO->getPayment();

        $amount = null;
        try {
            $amount = $this->formatPrice($this->subjectReader->readAmount($buildSubject));
        } catch (\InvalidArgumentException $e) {
            // pass
        }

        /*
         * we should remember that Payment sets Capture txn id of current Invoice into ParentTransactionId Field
         * We should also support previous implementations of Magento Braintree -
         * and cut off '-capture' postfix from transaction ID to support backward compatibility
         */
        $txnId = str_replace(
            '-' . TransactionInterface::TYPE_CAPTURE,
            '',
            $payment->getParentTransactionId()
        );

        return [
            'transaction_id' => $txnId,
            PaymentDataBuilder::AMOUNT => $amount
        ];
    }
}