getRecurringStruct example

$paymentMethodId = $this->getPaymentMethodId('recurring');
        $orderId = $this->createOrder($paymentMethodId);
        $transactionId = $this->createTransaction($orderId, $paymentMethodId);

        $response = RecurringPayResponse::create($transactionId, [
            'status' => OrderTransactionStates::STATE_PAID,
        ]);

        $this->appendNewResponse($this->signResponse($response->jsonSerialize()));

        $paymentHandler = $this->getContainer()->get(AppPaymentHandler::class);
        $paymentHandler->captureRecurring($this->getRecurringStruct(), Context::createDefaultContext());

        /** @var Request $request */
        $request = $this->getLastRequest();
        $body = $request->getBody()->getContents();

        $appSecret = $this->app->getAppSecret();
        static::assertNotNull($appSecret);

        static::assertTrue($request->hasHeader('shopware-shop-signature'));
        static::assertSame(hash_hmac('sha256', $body, $appSecret), $request->getHeaderLine('shopware-shop-signature'));
        static::assertNotEmpty($request->getHeaderLine('sw-version'));