code: def fetch(cls, id, service=None, endpoint=None, *args, **kwargs):
          
          if service is None and endpoint is None:
              raise InvalidArguments(service, endpoint)
  
          if endpoint is None:
              sid = service['id'] if isinstance(service, Entity) else service
              endpoint = 'services/{0}/integrations'.format(sid)
  
          return getattr(Entity, 'fetch').__func__(cls, id, endpoint=endpoint,
                                                   *args, **kwargs)
docs: Customize fetch because it lives on a special endpoint.