code: def _get_application_settings(self, application_id, settings_key, error_message):
  		
  
  		if not application_id:
  			value = SETTINGS.get(settings_key, empty)
  			if value is empty:
  				raise ImproperlyConfigured(error_message)
  			return value
  		else:
  			msg = (
  				"LegacySettings does not support application_id. To enable "
  				"multiple application support, use push_notifications.conf.AppSettings."
  			)
  			raise ImproperlyConfigured(msg)
docs: Legacy behaviour