Twilio callback is not working in my .NET service

Question

I am developing an SMS service which is expected to send SMS. Apart from that, I need to track status of the SMS.

I am using Twilio as an SMS provider, and ServiceStack to implement Service Layer.

I can see the SMS being sent successfully, however, I am not getting any response on the configured callback URL.

var message = MessageResource.Create(to: new PhoneNumber(sms.ToNumber),
from: new PhoneNumber(sms.FromNumber),
body: sms.MessageBody,
statusCallback: new Uri("http://8754622.ngrok.io/json/oneway/TwilioCallBack"));

I have downloaded Ngrok, and running it to map the localhost site to make it accessible externally.

Following is how I am trying to handle the callback from Twilio

public object Post(TwilioCallBack request)
{
    return _notificationProviderManager.SaveCallBackEvent(request.MessageStatus);
}

[Route("/TwilioCallBack", "POST")]
public class TwilioCallBack : INotificationCallBack
{
    public int id { get; set; }
        public string MessageStatus { get; set; }
}

While I can see the SMS getting delivered to the destination number, I cannot see anything happening at call back level.

Can anyone please suggest what needs to be done?

Any help on this will be much appreciated.

Thanks

Answer 1

In case the callback is a GET, I'd leave the Route and impl open to accept any HTTP Verb, e.g:

public object Any(TwilioCallBack request) { ... }

[Route("/TwilioCallBack")]
public class TwilioCallBack { ... }

Since you've defined a custom route, you should likely be using it (i.e. instead of the predefined route) in the callback:

statusCallback: new Uri("http://8754622.ngrok.io/TwilioCallBack"));