docs: public WaitingSessions getWaitingSessions() {
          String url = WxEndpoint.get("url.care.session.listwait");
          String response = wxClient.get(url);
          logger.debug("list care waiting sessions :{}", response);
          WaitingSessions sessionList = JsonMapper.defaultMapper().fromJson(response, WaitingSessions.class);
          return sessionList;
      }