verifying iOS in app purchase receipt with C#

Question

I am verifying my ios in app purchase receipt on my server using C# web service

I got receipt as string by doing below in Xcode:

Answer 1

Here's an alternative asynchronous implementation using HTTPClient:

public static async Task CheckReceiptWithAppStore()
    {
        string responseStr = null;

        string uri = "https://sandbox.itunes.apple.com/verifyReceipt";

        string receiptData = // Get your receipt from wherever you store it

        var json = new JObject(new JProperty("receipt-data", receiptData), 
            new JProperty("password", "paste-your-shared-secret-here")).ToString();

        using (var httpClient = new HttpClient())
        {        

            if (receiptData != null)
            {
                HttpContent content = new StringContent(json);

                try
                {
                    Task getResponse = httpClient.PostAsync(uri, content);
                    HttpResponseMessage response = await getResponse;
                    responseStr = await response.Content.ReadAsStringAsync();
                }
                catch (Exception e)
                {
                    Console.WriteLine("Error verifying receipt: " + e.Message);
                }
            }
        }

        return responseStr;
    }

The shared secret is not required for non-subscription based purchases.