npm install weixinpay --save

var weixinpay = require('weixinpay');


var weixinpay = new WeiXinPay({
   // pfx: fs.readFileSync('xxx/xxx/apiclient_cert.p12'),可选，退款需要
    appid: config.WXSetting.appid,//微信小程序appid
    openid: config.WXSetting.openid,//用户openid
    mch_id: config.WXSetting.mch_id,//商户帐号ID
    partner_key: config.WXSetting.secret,//秘钥
});

router.get('/unifiedorder', function(req, res, next) {

    var order = req.query.order || 'bookingNos';
    var totalFee = req.query.totalFee || 1;
    var ip = req.ip.replace('::ffff:', '');

    weixinpay
        .createUnifiedOrder({
            body: '支付测试ddddddddddddddd',
            out_trade_no: order,
            total_fee: totalFee,
            spbill_create_ip: ip,
            notify_url: 'https://xxx.xxx.com/',
            trade_type: 'JSAPI',
            product_id: '1234567890'
        }, function(body) {
            res.send(body);
        });
});

{
    return_code: "SUCCESS",
    return_msg: "OK",
    appid: "xae2ad8c364555262x",
    mch_id: "2209909803",
    nonce_str: "GB3qnPyB41ofpLR9",
    sign: "6674254B6sA9823803D1D64A86721EFB",
    result_code: "SUCCESS",
    prepay_id: "wx202613221881546ce5e4a1f70798435680",
    trade_type: "JSAPI"
}

{
    return_code: "SUCCESS",
    return_msg: "OK",
    appid: "xae2ad8c364555262x",
    mch_id: "2209909803",
    nonce_str: "NxwTR38TS7u3rLaZ",
    sign: "6674254B6sA9823803D1D64A86721EFB",
    result_code: "FAIL",
    err_code: "OUT_TRADE_NO_USED",
    err_code_des: "商户订单号重复"
}

router.get('/orderquery', function(req, res, next) {
   var order = req.query.order || 'bookingNos';
    wxpay.queryOrder({
        transaction_id: order
    }, function(err, order) {
        console.log(order);
        res.send(order);
    });
});

router.get('/closeorder', function(req, res, next) {
    var order = req.query.order || 'bookingNos';
    weixinpay.closeorder({
        transaction_id: order
    }, function(body) {
        res.send(body);
    });

});

wx.requestPayment({
   'timeStamp': '',
   'nonceStr': '',
   'package': '',
   'signType': 'MD5',
   'paySign': '',
   'success':function(res){
   },
   'fail':function(res){
   }
})