public void DelAdminUser()
        {
            // Delete the admin user.

            try {
                var voximplant = new VoximplantAPI();

                var result = voximplant.DelAdminUser(
                    requiredAdminUserId: "1"
                    ).Result;

                Console.WriteLine($"Response: {result.ToString()}");
            } catch (Exception e) {
                Console.WriteLine($"Error: {e.Message}");
            }
        }