AsyncPayResponse example

class AppAsyncPaymentHandlerTest extends AbstractAppPaymentHandlerTestCase
{
    final public const REDIRECT_URL = 'http://payment.app/do/something';

    public function testPayOtherState(): void
    {
        $paymentMethodId = $this->getPaymentMethodId('async');
        $orderId = $this->createOrder($paymentMethodId);
        $transactionId = $this->createTransaction($orderId, $paymentMethodId);
        $salesChannelContext = $this->getSalesChannelContext($paymentMethodId);

        $response = (new AsyncPayResponse())->assign([
            'redirectUrl' => self::REDIRECT_URL,
            'status' => StateMachineTransitionActions::ACTION_PAID_PARTIALLY,
        ]);
        $this->appendNewResponse($this->signResponse($response->jsonSerialize()));

        $this->paymentService->handlePaymentByOrder($orderId, new RequestDataBag(), $salesChannelContext);
        $this->assertOrderTransactionState(OrderTransactionStates::STATE_PARTIALLY_PAID, $transactionId);
    }

    public function testPayFailedState(): void
    {