docs: public static boolean isSuccess(JsonRtn jsonRtn) {
          if (jsonRtn == null) {
              return false;
          }
  
          String errCode = jsonRtn.getErrCode();
          if (StringUtils.isEmpty(errCode) || StringUtils.equals(WECHAT_JSON_RTN_SUCCESS_CODE, errCode)) {
              return true;
          }
  
          return false;
      }