code: def revoke_token(self, token, callback):
          '''
          revoke_token removes the access token from the data_store
          '''
          yield Task(self.data_store.remove, 'tokens', token=token)
          callback(f revoke_token(self, token, callback):
          '''
          revoke_token removes the access token from the data_store
          '''
          yield Task(self.data_store.remove, 'tokens', token=token)
          callback()
docs: revoke_token removes the access token from the data_store