Create a new client

Example request

{
  "account_sid": "9d26a637-1679-471f-8da8-7150266e1254",
  "username": "1234",
  "password": "secure_password_123",
  "is_active": 1,
  "allow_direct_app_calling": 1,
  "allow_direct_queue_calling": 1,
  "allow_direct_user_calling": 1
}