code: def authenticate(self, token):
          
          if self.verify_token_callback:
              # Specified verify function overrides below
              return self.verify_token_callback(token)
  
          if not token:
              return False
  
          name = self.token_manager.verify(token)
          if not name:
              return False
  
          return True
docs: Authenticate a token
  
          :param token: