docs: public void tagUsers(int tagId, List<String> openIds){
          Map<String, Object> map = new HashMap<>();
          map.put("tagid", tagId);
          map.put("openid_list", openIds);
          String url = WxEndpoint.get("url.tag.user.tag");
          logger.debug("add tag for users: {}", JsonMapper.defaultMapper().toJson(map));
          wxClient.post(url, JsonMapper.defaultMapper().toJson(map));
      }