nodejs implements WeChat code scanning payment function
Preparation work
WeChat public account-appid
WeChat merchant account-mch_id
key value (required for the signature algorithm, is actually a For a 32-bit password, you can use md5 to generate one) (key setting path: WeChat Merchant Platform (pay.weixin.qq.com)-->Account Settings-->API Security-->Key Settings)
Scan QR code to pay - unified ordering
The following is WeChat mode 2 because it is simpler
let MD5 = require('md5'), xml2js = require('xml2js'), url = "https://api.mch.weixin.qq.com/pay/unifiedorder",// 下单请求地址 appid = '公众号id', mch_id = '微信商户号'; notify_url = '回调地址', out_trade_no = '自己设置的订单号',// 微信会有自己订单号、我们自己的系统需要设置自己的订单号 total_fee = '订单金额',// 注意,单位为分 body = '商品简单描述', trade_type = 'NATIVE',// 交易类型,JSAPI--公众号支付、NATIVE--原生扫码支付、APP--app支付 nonce_str = moment().format('YYYYMMDDHHmmssSSS'),// 随机字符串32位以下 stringA = `appid=${公众号id}&body=${body}&mch_id=${微信商户号}&nonce_str=${nonce_str}¬ify_url=${ notify_url}&out_trade_no=${out_trade_no}&spbill_create_ip=${ctx.request.ip}&total_fee=${total_fee}&trade_type=${trade_type}`, stringSignTemp = stringA + "&key=xxxxxxxxxxxxxxxxx", //注:key为商户平台设置的密钥key sign = MD5(stringSignTemp).toUpperCase(); //注:MD5签名方式
The above are some parameters we need
For the signature generation algorithm, see WeChat official: https://pay.weixin.qq.com/wiki/doc/api/native.php?chapter=4_3
spbill_create_ip is the terminal ip address
The following splices all the parameters into xml
const formData = "<xml>"; formData += "<appid>" + appid + "</appid>"; //appid formData += "<body>" + body + "</body>"; //商品或支付单简要描述 formData += "<mch_id>" + mch_id + "</mch_id>"; //商户号 formData += "<nonce_str>" + nonce_str + "</nonce_str>"; //随机字符串,不长于32位 formData += "<notify_url>" + notify_url + "</notify_url>"; //支付成功后微信服务器通过POST请求通知这个地址 formData += "<out_trade_no>" + out_trade_no + "</out_trade_no>"; //订单号 formData += "<total_fee>" + total_fee + "</total_fee>"; //金额 formData += "<spbill_create_ip>" + ctx.request.ip + "</spbill_create_ip>"; //ip formData += "<trade_type>NATIVE</trade_type>"; //NATIVE会返回code_url ,JSAPI不会返回 formData += "<sign>" + sign + "</sign>"; formData += "</xml>"; // 这里使用了egg里面请求的方式 const resultData = yield ctx.curl(url, { method: 'POST', content: formData, headers: { 'content-type': 'text/html', }, }); // xml转json格式 xml2js.parseString(resultData.data, function (err, json) { if (err) { new Error("解析xml报错") } else { var result = formMessage(json.xml); // 转换成正常的json 数据 console.log(result) //打印出返回的结果 } }) var formMessage = function (result) { var message = {}; if (typeof result === 'object') { var keys = Object.keys(result); for (var i = 0; i < keys.length; i++) { var item = result[keys[i]]; var key = keys[i]; if (!(item instanceof Array) || item.length === 0) { continue; } if (item.length === 1) { var val = item[0]; if (typeof val === 'object') { message[key] = formMessage(val); } else { message[key] = (val || '').trim(); } } else { message[key] = []; for (var j = 0, k = item.length; j < k; j++) { message[key].push(formMessage(itemp[j])); } } } } return message; }
The egg request is used above Method, native node can use request
##
var request = require('request'); request({ url: url, method: "POST", body: formData }, function(error, response, body) { if (!error && response.statusCode == 200) { } });If the request is successful, an xml will eventually be returned, and then we will parse it into json format, which will have a code_url and out_trade_no, we These two need to be returned to the front end, and then the QR code is generated and displayed to the user to scan the code to complete the payment.
Monitor whether the payment is successful
Callback address
Set the callback address
Summary
- The signature algorithm must be written correctly, otherwise it will not be successful. It must be spliced correctly.
- WeChat returns data in xml format. We have to convert it to json through a plug-in, which is convenient. Obtain data
- The returned code_url is used to generate a QR code for the front end, and then a timer needs to be set up to query whether the order has been paid, and finally the user is notified of the result
- The callback address is very important. Our backend needs to post to receive the callback information returned by WeChat and then save the information. However, before saving the user's payment information, we need to know whether the order has been saved to avoid repeated additions. Also, the returned XML data must be ensured by the backend to be able to receive it. It cannot be received in the normal way and requires additional settings.
After the PC terminal WeChat scans the code to pay successfully, it will automatically jump to the php version code sharing
php implements WeChat code scanning payment sample code sharing
The above is the detailed content of nodejs implements WeChat code scanning payment function. For more information, please follow other related articles on the PHP Chinese website!

The shift from C/C to JavaScript requires adapting to dynamic typing, garbage collection and asynchronous programming. 1) C/C is a statically typed language that requires manual memory management, while JavaScript is dynamically typed and garbage collection is automatically processed. 2) C/C needs to be compiled into machine code, while JavaScript is an interpreted language. 3) JavaScript introduces concepts such as closures, prototype chains and Promise, which enhances flexibility and asynchronous programming capabilities.

Different JavaScript engines have different effects when parsing and executing JavaScript code, because the implementation principles and optimization strategies of each engine differ. 1. Lexical analysis: convert source code into lexical unit. 2. Grammar analysis: Generate an abstract syntax tree. 3. Optimization and compilation: Generate machine code through the JIT compiler. 4. Execute: Run the machine code. V8 engine optimizes through instant compilation and hidden class, SpiderMonkey uses a type inference system, resulting in different performance performance on the same code.

JavaScript's applications in the real world include server-side programming, mobile application development and Internet of Things control: 1. Server-side programming is realized through Node.js, suitable for high concurrent request processing. 2. Mobile application development is carried out through ReactNative and supports cross-platform deployment. 3. Used for IoT device control through Johnny-Five library, suitable for hardware interaction.

I built a functional multi-tenant SaaS application (an EdTech app) with your everyday tech tool and you can do the same. First, what’s a multi-tenant SaaS application? Multi-tenant SaaS applications let you serve multiple customers from a sing

This article demonstrates frontend integration with a backend secured by Permit, building a functional EdTech SaaS application using Next.js. The frontend fetches user permissions to control UI visibility and ensures API requests adhere to role-base

JavaScript is the core language of modern web development and is widely used for its diversity and flexibility. 1) Front-end development: build dynamic web pages and single-page applications through DOM operations and modern frameworks (such as React, Vue.js, Angular). 2) Server-side development: Node.js uses a non-blocking I/O model to handle high concurrency and real-time applications. 3) Mobile and desktop application development: cross-platform development is realized through ReactNative and Electron to improve development efficiency.

The latest trends in JavaScript include the rise of TypeScript, the popularity of modern frameworks and libraries, and the application of WebAssembly. Future prospects cover more powerful type systems, the development of server-side JavaScript, the expansion of artificial intelligence and machine learning, and the potential of IoT and edge computing.

JavaScript is the cornerstone of modern web development, and its main functions include event-driven programming, dynamic content generation and asynchronous programming. 1) Event-driven programming allows web pages to change dynamically according to user operations. 2) Dynamic content generation allows page content to be adjusted according to conditions. 3) Asynchronous programming ensures that the user interface is not blocked. JavaScript is widely used in web interaction, single-page application and server-side development, greatly improving the flexibility of user experience and cross-platform development.


Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

AI Hentai Generator
Generate AI Hentai for free.

Hot Article

Hot Tools

PhpStorm Mac version
The latest (2018.2.1) professional PHP integrated development tool

Zend Studio 13.0.1
Powerful PHP integrated development environment

SAP NetWeaver Server Adapter for Eclipse
Integrate Eclipse with SAP NetWeaver application server.

SublimeText3 Mac version
God-level code editing software (SublimeText3)

VSCode Windows 64-bit Download
A free and powerful IDE editor launched by Microsoft