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);
        }
    }