在Authorize.Net中使用Webhook进行自动订阅交易响应

Question

我在沙盒帐户Authorize.Net上创建了Webhook，在这种情况下，我需要事件（net.authorize.payment.authcapture.created的响应，因此需要订阅自动交易的响应。在此响应中，我没有获取订阅ID，但得到了交易ID如果我进一步使用事务ID通过GetTransactionDetailsController（获取事务API Authorize.Net）函数获取订阅ID，它将检索事务但订阅为null。如何使用事务响应获取订阅ID或使用（net.authorize.payment.authcapture.create d）事件响应获取订阅ID？

 public function getAutoshipResponse(Request $request)
   {
            define('AUTHNET_SIGNATURE', config('services.authorize.signature'));
            $payload = file_get_contents('php://input');
            Log::info("payload is ===   ". $payload);
            $headers = $this->getHeaders();
            $webhook = new AuthnetWebhook(AUTHNET_SIGNATURE, $payload, $headers);
            if ($webhook->isValid()) 
            {
                $eventtype = $webhook->eventType;
                $entityName = $webhook->payload->entityName;
                $this->getTransactionDetails($transactionId)
           }
    }
    public function getTransactionDetails($transactionId)
    {
            $transactionId = '60127785891';
            $merchantAuthentication = $this->setMerchantAuthentication();
            $refId = 'ref' . time();// Set the transaction's refId
            $request = new AnetAPI\GetTransactionDetailsRequest();
            $request->setMerchantAuthentication($merchantAuthentication);
            $request->setTransId($transactionId);
            $controller = new AnetController\GetTransactionDetailsController($request);
            $response = $controller->executeWithApiResponse(\net\authorize\api\constants\ANetEnvironment::SANDBOX);
            $subscriptionId = $response->getTransaction()->getSubscription();
            $json = json_encode($response->getTransaction());
            dd($response);
    }

响应：

GetTransactionDetailsResponse {#720 ▼
  -transaction: TransactionDetailsType {#913 ▼
    -transId: "60127785891"
    -refTransId: null
    -splitTenderId: null
    -submitTimeUTC: DateTime @1569416668 {#917 ▶}
    -submitTimeLocal: DateTime @1569391468 {#918 ▶}
    -transactionType: "authCaptureTransaction"
    -transactionStatus: "settledSuccessfully"
    -responseCode: 1
    -responseReasonCode: 1
    -subscription: null
    -responseReasonDescription: "Approval"
}