ios - 应用购买收据数据中的 Flutter (IOS)

Question

我使用 [in app purchase][1] 库在我使用 Flutter 开发的应用程序中进行应用内购买。进行购买时，为了在服务器端验证 Android 应用内购买，我发送的数据如下，我需要由服务器发送。

  _verifyPurchase(PurchaseDetails purchase) async {
    productID = purchase.productID;
    
    //for android it works nice
    if(Platform.isAndroid){
      orderId = purchase.billingClientPurchase.orderId;
      purchaseToken = purchase.billingClientPurchase.purchaseToken;
      purchaseVerify(orderId, purchaseToken, productID);

    //but it does not work for iOS and the data required for purchase verification does not go to the server
    }else if(Platform.isIOS){
      transactionId = purchase.skPaymentTransaction.originalTransaction;
      verifData = purchase.verificationData.serverVerificationData;
      purchaseVerify(transactionId, verifData, productID);
    }
  }

  purchaseVerify(String orderId, String purchaseToken, String productID) async {
    var data = {
      'orderId' : orderId,
      'purchaseToken' : purchaseToken,
      'productId' : productID,
    };

    res = await Network().authData(data, 'purchaseVerify.php');
  }

但是，尽管我尝试如下获取验证 iOS 应用内购买所需的数据，但没有数据发送到服务器端。

如何获取验证 iOS 应用内购买所需的数据并将其发送到服务器端？