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.

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