<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def _update_notification_settings(self, event, service, should_notify):
 """Update the settings of a an events notifications. :param event: Update the notification settings of this event. :type event: str :param service: The notification service to update. :type service: str :param should_notify: Notify if this is ``1``. :type should_notify: int """

        response = API.update_notification_settings(self.api_token, event,
                                                    service, should_notify)
        _fail_if_contains_errors(response)