class AliJsapi extends YsfpayPaymentService {

    @Override
    public String preCheck(UnifiedOrderRQ rq, PayOrder payOrder) {<FILL_FUNCTION_BODY>}

    @Override
    public AbstractRS pay(UnifiedOrderRQ rq, PayOrder payOrder, MchAppConfigContext mchAppConfigContext) throws Exception {
        String logPrefix = "【云闪付(alipayJs)jsapi支付】";
        JSONObject reqParams = new JSONObject();
        AliJsapiOrderRS res = ApiResBuilder.buildSuccess(AliJsapiOrderRS.class);
        ChannelRetMsg channelRetMsg = new ChannelRetMsg();
        res.setChannelRetMsg(channelRetMsg);

        // 请求参数赋值
        jsapiParamsSet(reqParams, payOrder, getNotifyUrl(), getReturnUrl());

        AliJsapiOrderRQ bizRQ = (AliJsapiOrderRQ) rq;
        //云闪付扫一扫支付， 需要传入buyerUserId参数
        reqParams.put("userId", bizRQ.getBuyerUserId()); // buyerUserId

        //客户端IP
        reqParams.put("customerIp", StringUtils.defaultIfEmpty(payOrder.getClientIp(), "127.0.0.1"));

        // 发送请求并返回订单状态
        JSONObject resJSON = packageParamAndReq("/gateway/api/pay/unifiedorder", reqParams, logPrefix, mchAppConfigContext);
        //请求 & 响应成功， 判断业务逻辑
        String respCode = resJSON.getString("respCode"); //应答码
        String respMsg = resJSON.getString("respMsg"); //应答信息
        try {

            //00-交易成功， 02-用户支付中 , 12-交易重复， 需要发起查询处理    其他认为失败
            if("00".equals(respCode)){
                //付款信息
                JSONObject payDataJSON = JSON.parseObject(resJSON.getString("payData"));
                String tradeNo = "";

                if(StringUtils.isNotBlank(payDataJSON.getString("tradeNo"))){
                    tradeNo = payDataJSON.getString("tradeNo");
                }else{
                    String prepayId = payDataJSON.getString("prepayId");
                    if(prepayId != null && prepayId.length() > 2 && !prepayId.startsWith(DateUtil.format(new Date(), "yyyy"))){
                        tradeNo = prepayId.substring(2);
                    }else{
                        tradeNo = prepayId;
                    }
                }
                res.setAlipayTradeNo(tradeNo);
                res.setPayData(payDataJSON.toJSONString());
                channelRetMsg.setChannelState(ChannelRetMsg.ChannelState.WAITING);
            }
        }catch (Exception e) {
            channelRetMsg.setChannelErrCode(respCode);
            channelRetMsg.setChannelErrMsg(respMsg);
        }
        return res;
    }

}


        AliJsapiOrderRQ bizRQ = (AliJsapiOrderRQ) rq;
        if(StringUtils.isEmpty(bizRQ.getBuyerUserId())){
            throw new BizException("[buyerUserId]不可为空");
        }
        return null;
    
<methods>public non-sealed void <init>() ,public static void barParamsSet(JSONObject, com.jeequan.jeepay.core.entity.PayOrder) ,public java.lang.String getIfCode() ,public static java.lang.String getYsfpayHost4env(com.jeequan.jeepay.core.model.params.ysf.YsfpayIsvParams) ,public boolean isSupport(java.lang.String) ,public static void jsapiParamsSet(JSONObject, com.jeequan.jeepay.core.entity.PayOrder, java.lang.String, java.lang.String) ,public JSONObject packageParamAndReq(java.lang.String, JSONObject, java.lang.String, com.jeequan.jeepay.pay.model.MchAppConfigContext) throws java.lang.Exception,public com.jeequan.jeepay.pay.rqrs.AbstractRS pay(com.jeequan.jeepay.pay.rqrs.payorder.UnifiedOrderRQ, com.jeequan.jeepay.core.entity.PayOrder, com.jeequan.jeepay.pay.model.MchAppConfigContext) throws java.lang.Exception,public java.lang.String preCheck(com.jeequan.jeepay.pay.rqrs.payorder.UnifiedOrderRQ, com.jeequan.jeepay.core.entity.PayOrder) ,public static void ysfPublicParams(JSONObject, com.jeequan.jeepay.core.entity.PayOrder) <variables>