docs: public void setWhiteList(List<String> openIds, List<String> userNames) {
          Map<String, Object> request = new HashMap<>();
          if (openIds != null && !openIds.isEmpty()) {
              request.put("openid", openIds);
          }
          if (userNames != null && !userNames.isEmpty()) {
              request.put("username", userNames);
          }
  
          String url = WxEndpoint.get("url.card.test.whitelist");
          String json = JsonMapper.defaultMapper().toJson(request);
          logger.debug("set test white list: {}", json);
          wxClient.post(url, json);
      }