code: def _get_application_settings(self, application_id, platform, settings_key):
  		
  
  		if not application_id:
  			conf_cls = "push_notifications.conf.AppConfig"
  			raise ImproperlyConfigured(
  				"{} requires the application_id be specified at all times.".format(conf_cls)
  			)
  
  		# verify that the application config exists
  		app_config = self._settings.get("APPLICATIONS").get(application_id, None)
  		if app_config is None:
  			raise ImproperlyConfigured(
  				"No application configured with application_id: {}.".format(application_id)
  			)
  
  		# fetch a setting for the incorrect type of platform
  		if app_config.get("PLATFORM") != platform:
  			raise ImproperlyConfigured(
  				SETTING_MISMATCH.format(
  					application_id=application_id,
  					platform=app_config.get("PLATFORM"),
  					setting=settings_key
  				)
  			)
  
  		# finally, try to fetch the setting
  		if settings_key not in app_config:
  			raise ImproperlyConfigured(
  				MISSING_SETTING.format(
  					application_id=application_id, setting=settings_key
  				)
  			)
  
  		return app_config.get(settings_key)
docs: Walks through PUSH_NOTIFICATIONS_SETTINGS to find the correct setting value
  		or raises ImproperlyConfigured.