docs: async def _check_subscriptions(self):
          """
          Checks that all subscriptions are subscribed
          """
  
          subscribed, url = await self._get_subscriptions()
          expect = set(settings.FACEBOOK_SUBSCRIPTIONS)
  
          if (expect - subscribed) or url != self.webhook_url:
              await self._set_subscriptions(expect | subscribed)
              logger.info('Updated webhook subscriptions')
          else:
              logger.info('No need to update webhook subscriptions')