สอบถามเรื่อง การทำ InAppPurchase (เพื่อใช้งานจริง) ของ Windows RT

private async Task LoadInAppPurchaseProxyFileAsync()
        {
            StorageFolder proxyDataFolder = await Package.Current.InstalledLocation.GetFolderAsync("data");
            StorageFile proxyFile = await proxyDataFolder.GetFileAsync("in-app-purchase.xml");
            licenseChangeHandler = new LicenseChangedEventHandler(InAppPurchaseRefreshScenario);
            CurrentAppSimulator.LicenseInformation.LicenseChanged += licenseChangeHandler;
            await CurrentAppSimulator.ReloadSimulatorAsync(proxyFile);

            // setup application upsell message
            try
            {
                ListingInformation listing = await CurrentAppSimulator.LoadListingInformationAsync();
                var product1 = listing.ProductListings["product1"];
                var product2 = listing.ProductListings["product2"];
                Product1SellMessage.Text = "You can buy " + product1.Name + " for: " + product1.FormattedPrice + ".";
                Product2SellMessage.Text = "You can buy " + product2.Name + " for: " + product2.FormattedPrice + ".";
            }
            catch (Exception)
            {
                rootPage.NotifyUser("LoadListingInformationAsync API call failed", NotifyType.ErrorMessage);
            }
        }