static void Main(string[] args) { // Find your Account Sid and Auth Token at twilio.com/user/account string AccountSid = "ACXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX"; string AuthToken = "your_auth_token"; var twilio = new TwilioRestClient(AccountSid, AuthToken); var credentials = twilio.ListCredentials("CL32a3c49700934481addd5ce1659f04d2", null, null); foreach (var credential in credentials.Credentials) { Console.WriteLine(credential.Username); } }