docs: public static <T> RestRequestParam<T> generateRequestParam(
        T data, String accessKey, String secretKey) {
      RestRequestParam<T> param = new RestRequestParam<T>();
      param.setData(data);
      RestRequestParam.Common common = param.newCommon(accessKey, System.currentTimeMillis());
      String sign = RestSignUtil.generateSign(param, secretKey);
      common.setSign(sign);
      return param;
    }