public bool verify_merchant(string mer_key, out string mer_id, out string errMsg)
        {
            IBLL.ISysBLL bll = new BLL.SysBLL();
            var          mer = bll.GetMerchantByKey(mer_key);

            if (mer == null)
            {
                mer_id = "";
                errMsg = "不存在商户";
                return(false);
            }
            if (mer.status != "1")
            {
                mer_id = "";
                errMsg = "商户已停用";
                return(false);
            }
            mer_id = mer.mer_id;
            errMsg = "";
            return(true);
        }