public void Verify_Serial_Number_Supported()
        {
            var sn = "123456";
              var request = new NotificationHistoryRequest(new NotificationHistorySerialNumber(sn));

              var roundTrip = EncodeHelper.Deserialize(EncodeHelper.Utf8BytesToString(request.GetXml()),
            typeof(GCheckout.AutoGen.NotificationHistoryRequest)) as GCheckout.AutoGen.NotificationHistoryRequest;

              Assert.AreEqual(sn, roundTrip.serialnumber);
        }