code: def message(self, phone_number, message, message_type, **params):
          
          return self.post(MESSAGING_RESOURCE,
                           phone_number=phone_number,
                           message=message,
                           message_type=message_type,
                           **params)
docs: Send a message to the target phone_number.
  
          See https://developer.telesign.com/docs/messaging-api for detailed API documentation.