nodejs+Koa2实现小程序的微信支付请求（一）

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nodejs+koa2 实现微信支付请求

在开发之前我们先看一下小程序向微信请求支付的业务流程

第一步，小程序先发起支付请求

小程序首先先向“商家系统后台”发起请求支付，也就是我们自己的后端服务，生成平台订单和签x

第二步，我们的nodejs服务接收到请求之后，处理支付请求，签名后强微信请求支付

let xmlData = await WXPlay.requestWXPay(wxPayInfo); ->这里是向微信支付服务器请求支付的地方

router.post('/xxxxPay',async (ctx) => {const v = await new PayFeeValidator().validate(ctx);let body = ctx.request.body;let payAmount = Math.floor(parseFloat(body.payAmount))*100);let orderType = body.orderType;let content = body.content)?body.content):'支付费用';let wxPayInfo = {userId: ctx.auth.uid,entriesId: body.entriesId,openId: header.openid,payAmount: payAmount,money: body.payAmount,ip: host,productIntro: content,orderType: orderType}let xmlData = await WXPlay.requestWXPay(wxPayInfo);let response = xmlData.xmlif (response.return_code === 'SUCCESS') {if (response.result_code === 'SUCCESS') {let timeStamp = createTimeStamp();let nonceStr = response.nonce_str;let prepay_id = response.prepay_id;let appid = global.config.violinWx.appid;let package = 'prepay_id=' + prepay_id;let apiKey = global.config.violinWx.payApiKey;let paySign = getPaySignJs(appid, timeStamp, nonceStr, package, apiKey);const order = await Order.getOrderDetailByPer(prepay_id);ctx.body = {code: 0,msg: 'SUCCESS',data: {timeStamp: timeStamp,nonceStr: nonceStr,package: package,paySign: paySign,orderNo: order.orderNo}}} else {ctx.body = {code: response.err_code,msg: response.err_code_des} } } else {ctx.body = {code: 1,msg: response.return_msg}}
})

我们的服务端拿到微信的支付响应之后，返回给小程序以下参数

timeStamp: 时间戳

nonceStr: 随机字符串

package: 订单详情扩展字符串

paySign: 签名

orderNo: 我们系统的订单号

signType：签名方式

小程序拿到这些信心后才开始真正调起支付，代码如下

                wx.requestPayment({timeStamp: res.data.timeStamp.toString(),nonceStr: res.data.nonceStr,package: res.data.package,signType: 'MD5',paySign: res.data.paySign,success (result) {wx.showToast({title: `支付成功`,icon: 'none',duration: 2000})// 下面做支付成功的事情},fail (result) {wx.showToast({title: `您的支付请求失败，请重新支付`,icon: 'none',duration: 2000})}})

微信支付成功后下面需要处理的就是微信收到付款后的回调，这里的支付回调接口一定要在微信支付平台配置正确

router.post('/XXXPayNotice', async (ctx) => {let result = 1;const wxResponse = ctx.body.xml;if (wxResponse && wxResponse.return_code[0] === 'SUCCESS') {if (wxResponse.result_code[0] === 'SUCCESS') {let timeEnd = wxResponse.time_end[0];let pattern = /(\d{4})(\d{2})(\d{2})(\d{2})(\d{2})(\d{2})/;let formateDate = timeEnd.replace(pattern, '$1/$2/$3 $4:$5:$6');let order = {orderStatus: 1,confirmTime: new Date(),arrivalTime: formateDate,confirmFlag: 1,transactionNo: wxResponse.transaction_id[0],orderNo: wxResponse.out_trade_no[0]}const orderR = await Order.getOrderByOrderNo(order.orderNo);if (orderR) {let payAmount = Math.floor(parseFloat(orderR.payAmount)*100); if (payAmount === parseInt(wxResponse.total_fee[0])) {await Order.updateOrderByWxResponse(order);result = 1;} else {result = 2;}if (orderR.orderType === 0) {let entries = {entriesStage: 2,payStatus: 1,orderNo: order.orderNo,entriesId: orderR.entriesId}if( result === 1) {await V_Entries.updateEntriesPayInfo(entries);// 修改用户标记为已支付用户await V_User.updateIsEnteriesUser(1,orderR.userId);}}if (orderR.orderType === 1) {// 处理大师班报名let payInfo = {payStatus: 1,orderNo: order.orderNo}await T_Student_Class.updatePayInfoByOrderNo(payInfo);}} else {result = 3;}} else {let timeEnd = wxResponse.time_end[0];let pattern = /(\d{4})(\d{2})(\d{2})(\d{2})(\d{2})(\d{2})/;let formateDate = timeEnd.replace(pattern, '$1/$2/$3 $4:$5:$6');let order = {orderStatus: 2,confirmTime: new Date(),arrivalTime: formateDate,confirmFlag: 1,transactionNo: wxResponse.transaction_id[0],orderNo: wxResponse.out_trade_no[0]}await Order.updateOrderByWxResponse(order)}}if (result === 2) {ctx.type = 'application/xml';ctx.headers[{'Content-Type': 'text/xml'}];ctx.body = '<xml><return_code><![CDATA[FAIL]]></return_code><return_msg><![CDATA[未找到订单]]></return_msg></xml>';} else if (result === 3) {ctx.type = 'application/xml';ctx.headers[{'Content-Type': 'text/xml'}];ctx.body = '<xml><return_code><![CDATA[FAIL]]></return_code><return_msg><![CDATA[金额校验失败]]></return_msg></xml>';} else {ctx.type = 'application/xml';ctx.headers[{'Content-Type': 'text/xml'}];ctx.body = '<xml><return_code><![CDATA[SUCCESS]]></return_code><return_msg><![CDATA[OK]]></return_msg></xml>';}    
})

微信支付成功的通知参数消息体

let wxResponse = {

"appid": ["XXXXX"],

"attach": ["XXXX"],

"bank_type": ["OTHERS"],

"cash_fee": ["1"],

"fee_type": ["CNY"],

"is_subscribe": ["N"],

"mch_id": ["XXXX"],商户号

"nonce_str": ["uNE3NFA0nGPAU7iiOGsuDRkC6qNcNQc8"],

"openid": [""], 支付用户的openID

"out_trade_no": [""],

"result_code": ["SUCCESS"],

"return_code": ["SUCCESS"],

"sign": ["C82D1DE210366E280DBBE6F7D9A3A63A"],

"time_end": ["20200628212320"],

"total_fee": ["1"],

"trade_type": ["JSAPI"],

"transaction_id": [""]

}

里面用的签名和具体的支付请求，查看这里：签名预支付请求

参数说明，参考微信支付-开发者文档

未完待续

实现代码：nodejs+koa2实现微信小程序签名和请求支付（二）_仗剑走天涯的博客-CSDN博客废话不多说直接上代码：const getTradeNo = function() { let date = new Date(); let arr = [ date.getFullYear(), ((date.getMonth() + 1)>=10?(date.getMonth() + 1):'0'+(date.getMonth() + 1)), date.getDate(), date.getHours(), https://blog.csdn.net/u012885136/article/details/121359473