Response status code does not indicate success: 503 (Service Unavailable). (System.Net.Http.HttpRequestException) at System.Net.Http.HttpResponseMessage.EnsureSuccessStatusCode() at AMCS.HttpClient.AmcsHttpClient.<SendAsync>d__6`1.MoveNext() --- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at AMCS.Elemos.Server.Api.Payment.Http.PayGetApiHelper`1.<>c__DisplayClass1_0.<<GetResponseObjectFromAMCSPay>b__0>d.MoveNext() --- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at AMCS.Data.Support.TaskUtils.RunSynchronously[T](Func`1 callback) at AMCS.Elemos.Server.Configuration.DataConfigurationExtensions.PaymentPortalDiagnostics.RunCheck(ISessionToken sessionToken, String url)