docs: def application_id(self, app_id):
          """Validate request application id matches true application id.
  
          Verifying the Application ID matches: https://goo.gl/qAdqe4.
  
          Args:
              app_id: str. Request application_id.
  
          Returns:
              bool: True if valid, False otherwise.
          """
          if self.app_id != app_id:
              warnings.warn('Application ID is invalid.')
              return False
          return True