code: def get_by_identifier(self, identifier):
          
  
          params = {'identifier': identifier}
  
          return self.client.get(self._url(), params=params)
docs: Gets blocks by identifier
  
          Args:
             identifier (str): Should be any of: username, phone_number, email.
  
          See: https://auth0.com/docs/api/management/v2#!/User_Blocks/get_user_blocks