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官网
https://opendocs.alipay.com/common/02kkv7
进入沙箱
https://open.alipay.com/develop/sandbox/app
下载支付宝开放平台开发助手
生成密钥
将密钥配置
下载安装sdk
cnpm install alipay-sdk -S
新建支付宝对接js文件

//引入sdk
const AlipaySdk = require('alipay-sdk').default;
const alipaySdk = new AlipaySdk({
  //APPID
  appId: '2021*************',
  //签名算法
  signType:'RSA2',
  //支付宝公钥
  alipayPublicKey:'MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAk46MSrCR6qGbiM33h1PuM8qGSng14sE9DRHcaRNpNWKTHmi72GvxHFuB6Go9ckullCLCi9kgJY0JWAr0DWTW7svjLH2xCv493GzHN9YVBl1xfN7VcOrt41smcAFjSJ3Hh6gpw7L1ZK24qStZHB1B0/2/XnV/p5iipDfXPDBJ5oOAc4RSYu+7A9NAAPQx/jEwdT6VrgpO4vpKuqVGGlGMS+briNWa4FEgzazh9LnvIybazln/mWukESG0U5SeM14jmHOkmcmPdstI/eCJVrUIMQlRDAkq1IznxR***************************************',
  //应用私钥
  privateKey: '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***************************************************************', // 传入私钥
  //支付宝网关
  gateway: "https://openapi.alipaydev.com/gateway.do" // 沙箱环境的请求网关与正式环境不一样，需要在此更改，如果是使用正式环境则去掉此处的设置
});

module.exports = alipaySdk

项目中引入

//引入支付宝配置文件
const alipaySdk = require('../db/alipay.js');
const AlipayFormData = require('alipay-sdk/lib/form').default;

接口中使用

//发起支付
router.post('/api/payment',function(req,res,next){

  //订单号
  let id = req.body.id || JSON.parse(Object.keys(req.body)).id;
  //商品总价
  let price 
  //购买商品的名称
  let name

  //开始对接支付宝API
  const formData = new AlipayFormData()
  //调用 setMethod 并传入 get ， 会返回可以跳转到支付页面的url
  formData.setMethod('get');
  //支付时信息


formData.addField('bizContent', {
  //订单号
  outTradeNo: id,
  //写死的
  productCode: 'FAST_INSTANT_TRADE_PAY',
  //价格
  totalAmount: price,
  //商品名称
  subject: name,
  //商品详情
  body: '商品详情',
});

  // 当支付完成后，支付宝主动向我们的服务器发送回调的地址
  formData.addField('notifyUrl', 'http://www.com/notify');
  // 当支付完成后，当前页面跳转的地址
formData.addField('returnUrl', 'http://localhost:8080/payment');

  //返回一个promise
  const result = await alipaySdk.exec(
    'alipay.trade.page.pay',
    {},
    { formData: formData },
  );
  //对接支付宝成功，支付宝返回的数据
  result.then(resp => {
    res.send({
      data:{
        code:200,
        success:true,
        msg:'支付中',
        paymentUrl:resp
      }
    })
  })

})

注意：一定要使用无痕浏览，否则失败
使用沙箱提供账号去支付
后端可以通过支付宝方返回的回调处理订单状态，也可以后端引入axios像支付宝发起请求，来获取订单的状态

//支付成功/失败
router.post("/api/successPayment", function (req, res, next) {
 //token
 let token = req.headers.token;
 let tokenObj = jwt.decode(token);
 //订单号
 let out_trade_no = req.body.out_trade_no;
 let trade_no = req.body.trade_no;
 //支付宝配置
 const formData = new AlipayFormData();
 // 调用 setMethod 并传入 get，会返回可以跳转到支付页面的 url
 formData.setMethod('get');
 //支付时信息
 formData.addField('bizContent', {
   out_trade_no,
   trade_no
 });
 //返回promise
 const result = alipaySdk.exec(
   'alipay.trade.query',
   {},
   { formData: formData },
 );
 //后端请求支付宝
 result.then(resData=>{
     axios({
         method:'GET',
         url:resData
     }).then(data=>{
         let responseCode = data.data.alipay_trade_query_response;
         if(  responseCode.code == '10000' ){
             switch(  responseCode.trade_status  ){
                 case 'WAIT_BUYER_PAY':
                     res.send({
                         data:{
                             code:0,
                             data:{
                                 msg:'支付宝有交易记录，没付款'
                             }
                         }
                     })
                 break;
                 
                 case 'TRADE_CLOSED':
                     res.send({
                         data:{
                             code:1,
                             data:{
                                 msg:'交易关闭'
                             }
                         }
                     })
                 break;
                 
                 case 'TRADE_FINISHED':
                     connection.query(`select * from user where tel = ${tokenObj.tel}`,function(error,results){
                         //用户id
                         let uId = results[0].id;
                         connection.query(`select * from store_order where uId = ${uId} and order_id = ${out_trade_no}`,function(err,result){
                             let id = result[0].id;
                             //订单的状态修改掉2==》3
                             connection.query(`update store_order set order_status = replace(order_status,'1','2') where id = ${id}`,function(){
                                 res.send({
                                     data:{
                                         code:2,
                                         data:{
                                             msg:'交易完成'
                                         }
                                     }
                                 })
                             })
                         })
                     })
                 break;
                 
                 case 'TRADE_SUCCESS':
                     connection.query(`select * from user where tel = ${tokenObj.tel}`,function(error,results){
                         //用户id
                         let uId = results[0].id;
                         connection.query(`select * from store_order where uId = ${uId} and order_id = ${out_trade_no}`,function(err,result){
                             let id = result[0].id;
                             //订单的状态修改掉2==》3
                             connection.query(`update store_order set order_status = replace(order_status,'1','2') where id = ${id}`,function(){
                                 res.send({
                                     data:{
                                         code:2,
                                         data:{
                                             msg:'交易完成'
                                         }
                                     }
                                 })
                             })
                         })
                     })
                 break;
             }
         }else if( responseCode.code == '40004' ){
             res.send({
                 data:{
                     code:4,
                     msg:'交易不存在'
                 }
             })
         }
     }).catch( err=>{
         res.send({
             data:{
                 code:500,
                 msg:'交易失败',
                 err
             }
         })
     })
 })

})