docs: async def undo_check_in(self):
          """ Undo the check in for this participant
  
          |methcoro|
  
          Warning:
              |unstable|
  
          Raises:
              APIException
  
          """
          res = await self.connection('POST', 'tournaments/{}/participants/{}/undo_check_in'.format(self._tournament_id, self._id))
          self._refresh_from_json(res)