getTransaction example

$criteria->addAssociation('transactionCapture.transaction.order');
        $criteria->addAssociation('transactionCapture.transaction.paymentMethod.appPaymentMethod.app');
        $criteria->addAssociation('transactionCapture.positions');

        $refund = $this->refundRepository->search($criteria, $context)->first();

        if (!($refund instanceof OrderTransactionCaptureRefundEntity)) {
            throw PaymentException::unknownRefund($refundId);
        }

        if (!$refund->getTransactionCapture()
            || !$refund->getTransactionCapture()->getTransaction()
            || !$refund->getTransactionCapture()->getTransaction()->getOrder()
        ) {
            return;
        }

        $transaction = $refund->getTransactionCapture()->getTransaction();
        $paymentMethod = $this->getAppPaymentMethod($transaction);
        $refundUrl = $paymentMethod->getRefundUrl();

        if (!$refundUrl) {
            return;
        }

use JsonSerializableTrait;
    use RemoveAppTrait;

    protected Source $source;

    protected OrderTransactionCaptureRefundEntity $refund;

    public function __construct(
        OrderTransactionCaptureRefundEntity $refund,
        protected OrderEntity $order
    ) {
        if ($refund->getTransactionCapture() && $refund->getTransactionCapture()->getTransaction()) {
            $transaction = $this->removeApp($refund->getTransactionCapture()->getTransaction());
            $refund->getTransactionCapture()->setTransaction($transaction);
        }

        $this->refund = $refund;
    }

    public function getOrderTransaction(): OrderTransactionEntity
    {
        if ($this->refund->getTransactionCapture() && $this->refund->getTransactionCapture()->getTransaction()) {
            return $this->refund->getTransactionCapture()->getTransaction();
        }

throw $e;
        }
    }

    public function handlePostOrderPayment(
        OrderEntity $order,
        RequestDataBag $dataBag,
        SalesChannelContext $salesChannelContext,
        ?Struct $preOrderStruct
    ): void {
        try {
            $transaction = $this->getTransaction($order, $salesChannelContext);
            if ($transaction === null) {
                return;
            }

            $paymentHandler = $this->getPaymentHandlerFromTransaction($transaction);

            if (!($paymentHandler instanceof PreparedPaymentHandlerInterface)
                || $preOrderStruct === null) {
                return;
            }