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); twilio.UpdateUsageTrigger("UT33c6aeeba34e48f38d6899ea5b765ad4", "Monthly Maximum Call Usage", "https://www.example.com/monthly-usage-trigger", null); }