我需要一些关于Xamarin.Forms的InAppBillingPlugin的支持 . 首先，我根据documnetation进行了配置：https://jamesmontemagno.github.io/InAppBillingPlugin/

应用程序，Google控制台（被管理产品）和iTunes Connect网站 .

这是我的应用程序代码 .

private async Task TryInAppPurchace(string androidProductId, string iOSProductId="")
{
    if (!CrossInAppBilling.IsSupported)
        return;

    //Android
    var products = new string[] { androidProductId };

    if(Device.RuntimePlatform == Device.iOS)
        products = new string[] { iOSProductId };

    var billing = CrossInAppBilling.Current;
    //billing.InTestingMode = true;

    try
    {
        var connected = await billing.ConnectAsync(ItemType.InAppPurchase);

        if (!connected)
        {
            await Application.Current.MainPage.DisplayAlert("Connectivity Error", "Unable to connect to the internet.", "OK");
            return;
        }

        var items = await billing.GetProductInfoAsync(ItemType.InAppPurchase, products);
        var item = items.ToList().First();

        //try to purchase item
        var purchase = await billing.PurchaseAsync(item.ProductId, ItemType.InAppPurchase, item.ProductId);

        //possibility that a null came through.
        if (purchase == null)
        {
            await Application.Current.MainPage.DisplayAlert("Purchase Error", "You are unable to buy this product.", "OK");
            return;
        }
        else
        {
            await _pageService.DisplayAlert("Purchased", "Consumable product.", "OK");

            if (Device.RuntimePlatform == Device.iOS)
                return;

            var consumedItem = await CrossInAppBilling.Current.ConsumePurchaseAsync(purchase.ProductId, purchase.PurchaseToken);

            if (consumedItem != null)
            {
                await Application.Current.MainPage.DisplayAlert("New Package added", "Successfully added new package", "OK");
            }
        }
    }
    catch (InAppBillingPurchaseException purchaseEx)
    {
        var message = string.Empty;
        await Application.Current.MainPage.DisplayAlert("Exeption", purchaseEx.Message, "OK");
        switch (purchaseEx.PurchaseError)
        {
            case PurchaseError.BillingUnavailable:
                message = "BillingUnavailable";
                break;
            case PurchaseError.DeveloperError:
                message = "DeveloperError";
                break;
            case PurchaseError.ItemUnavailable:
                message = "ItemUnavailable";
                break;
            case PurchaseError.GeneralError:
                message = "GeneralError";
                break;
            case PurchaseError.UserCancelled:
                message = "UserCancelled.";
                break;
            case PurchaseError.AppStoreUnavailable:
                message = "AppStoreUnavailable.";
                break;
            case PurchaseError.PaymentNotAllowed:
                message = "PaymentNotAllowed.";
                break;
            case PurchaseError.PaymentInvalid:
                message = "PaymentInvalid";
                break;
            case PurchaseError.InvalidProduct:
                message = "InvalidProduct";
                break;
            case PurchaseError.ProductRequestFailed:
                message = "ProductRequestFailed";
                break;
            case PurchaseError.RestoreFailed:
                message = "RestoreFailed";
                break;
            case PurchaseError.ServiceUnavailable:
                message = "ServiceUnavailable";
                break;
        }
    }
    catch (Exception ex)
    {
        //Something else has gone wrong, log it
        await Application.Current.MainPage.DisplayAlert("Exeption", ex.Message, "OK");
    }
    finally
    {
        await billing.DisconnectAsync();
    }
}

我的问题是我无法再次购买相同的产品而且我从Google Play获得了以下内容：

{Plugin.InAppBilling.Abstractions.InAppBillingPurchaseException：无法处理购买 . 在Plugin.InAppBilling.InAppBillingImplementation d__33.MoveNext（）[0x00116]在C：\ projects \ inappbillingplugin \ src \ Plugin.InAppBilling.Android \ InAppBillingImplementation.cs：324 ---从先前位置抛出异常的堆栈跟踪结束 - - 在System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw（）[0x0000c] in：0中的System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess（System.Threading.Tasks.Task任务）[0x0003e] in：0在System.Runtime .CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification（System.Threading.Tasks.Task任务）[0x00028] in：0 at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd（System.Threading.Tasks.Task task）[0x00008] in：0 at System .Runtime.CompilerServices.TaskAwaiter1 [TResult] .GetResult（）[0x00000] in：0 in Plugin.InAppBilling.InAppBillingImplementation d__32.MoveNext（）[0x00090] in C：\ projects \ inappbillingplugin \ src \ Plugin.InAppBilling.Android \ InAppBillingImplementation.cs：264 ---来自prev的堆栈跟踪结束在抛出异常的位置---在System.Runtime.ExilerServices.ExceptionDispatchInfo.Throw（）[0x0000c] in：0 in System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess（System.Threading.Tasks.Task task）[0x0003e] in：0 at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification（System.Threading.Tasks.Task task）[0x00028] in：0 at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd（System.Threading.Tasks.Task task）[ 0x00008] in：0中的System.Runtime.CompilerServices.TaskAwaiter1 [TResult] .GetResult（）[0x00000] in：0中的DrivingCourse_app.ViewModels.AccessPageViewModel d__18.MoveNext（）[0x0025c] in C：\ Projects \ GIT- REPO \ DrivingCourse_DE \ DrivingCourse_app \ DrivingCourse_app \ DrivingCourse_app \ ViewModels \ AccessPageViewModel.cs：136}

我的代码有问题吗？此代码适用于每次购买产品，因此配置本身和一般过程都有效 .

有任何想法吗？

xamarin xamarin.forms