def group_memberships(self, group_id, **kwargs):
        "https://developer.zendesk.com/rest_api/docs/core/group_memberships#list-memberships"
        api_path = "/api/v2/groups/{group_id}/memberships.json"
        api_path = api_path.format(group_id=group_id)
        return self.call(api_path, **kwargs)
https://developer.zendesk.com/rest_api/docs/core/group_memberships#list-memberships