code: def _validate_allowed_settings(self, application_id, application_config, allowed_settings):
  		
  
  		for setting_key in application_config.keys():
  			if setting_key not in allowed_settings:
  				raise ImproperlyConfigured(
  					"Platform {}, app {} does not support the setting: {}.".format(
  						application_config["PLATFORM"], application_id, setting_key
  					)
  				)
docs: Confirm only allowed settings are present.