title: Google Checkout Notification Acknowledgement (C# ASP.NET MVC)
body: <p>I'm trying to send Google Checkout a Notification Acknowledgement once I receive a serial number so it would know that I've already handled this serial number and saved it to my database. But I keep getting the following error in the integration console:</p>
  
  <blockquote>
    <p>We encountered an error processing
    your notification acknowledgment. The
    error we got is: Error parsing
    notification acknowledgment.</p>
  </blockquote>
  
  <p>When I check the value being sent to the server, everything seems to look fine to me:</p>
  
  <pre><code>&lt;notification-acknowledgement xmlns="http://checkout.google.com/schema/2" serial-number="357304636821412-00001-7" /&gt;
  </code></pre>
  
  <p>Here's my code:</p>
  
  <pre><code>    [HttpPost]
      public EmptyResult Notify()
      {
          var serial = Request["serial-number"];
          var data =
              "&lt;notification-history-request xmlns=\"http://checkout.google.com/schema/2\"&gt;&lt;serial-number&gt;" + serial + "&lt;/serial-number&gt;&lt;/notification-history-request&gt;";
          var serverResponse = _checkoutService.Post(data, GoogleCheckoutConstants.ReportsUri);
  
          //Send me email to checkout the response
          dynamic email = new Email("CheckoutLog");
          email.Response = serverResponse;
          email.Send();
  
          var acknowldgement =
              "&lt;notification-acknowledgement xmlns=\"http://checkout.google.com/schema/2\" serial-number=\"" + serial +
              "\" /&gt;";
  
          HttpResponse response = System.Web.HttpContext.Current.Response;
           response.StatusCode = 200;
           response.ContentType = "text/xml";
          response.Write(acknowldgement);
          return null;
      }
  </code></pre>
  
  <p>Moreover, why do I keep receiving <code>new-order-notification</code> only? What's more important to me is the <code>authorization-amount-notification</code>, but it never sends it although in the <a href="http://code.google.com/apis/checkout/developer/Google_Checkout_Custom_Processing_How_To.html" rel="nofollow">Documentation Section 2, Step 2.1</a> it says that after some time it should send me this notification. Am I missing something here?</p>