weixin pay

weixin-pay

WeChat payment for node.js

Installation

 npm install weixin-pay

Usage

Create a unified payment order

 var WXPay = require ( 'weixin-pay' ) ;

var wxpay = WXPay ( {
	appid : 'xxxxxxxx' ,
	mch_id : '1234567890' ,
	partner_key : 'xxxxxxxxxxxxxxxxx' , //微信商户平台API密钥
	pfx : fs . readFileSync ( './wxpay_cert.p12' ) , //微信商户平台证书
} ) ;

wxpay . createUnifiedOrder ( {
	body : '扫码支付测试' ,
	out_trade_no : '20140703' + Math . random ( ) . toString ( ) . substr ( 2 , 10 ) ,
	total_fee : 1 ,
	spbill_create_ip : '192.168.2.210' ,
	notify_url : 'http://wxpay_notify_url' ,
	trade_type : 'NATIVE' ,
	product_id : '1234567890'
} , function ( err , result ) {
	console . log ( result ) ;
} ) ;

Query order

 // 通过微信订单号查
wxpay . queryOrder ( { transaction_id : "xxxxxx" } , function ( err , order ) {
	console . log ( order ) ;
} ) ;

// 通过商户订单号查
wxpay . queryOrder ( { out_trade_no : "xxxxxx" } , function ( err , order ) {
	console . log ( order ) ;
} ) ;

Close order

 wxpay . closeOrder ( { out_trade_no : "xxxxxx" } , function ( err , result ) {
	console . log ( result ) ;
} ) ;

Refund interface

 var params = {
	appid : 'xxxxxxxx' ,
	mch_id : '1234567890' ,
    op_user_id : '商户号即可' ,
    out_refund_no : '20140703' + Math . random ( ) . toString ( ) . substr ( 2 , 10 ) ,
    total_fee : '1' , //原支付金额
    refund_fee : '1' , //退款金额
    transaction_id : '微信订单号'
} ;

wxpay . refund ( params , function ( err , result ) {
    console . log ( 'refund' , arguments ) ;
} ) ;

Native payment (NATIVE)

Mode one

Provide a function to generate a payment QR code link, and generate a QR code from the URL for the user to scan.

 var url = wxpay . createMerchantPrepayUrl ( { product_id : '123456' } ) ;

After receiving the callback from WeChat, the merchant backend calls createUnifiedOrder() to generate a prepayment transaction order and returns the resulting XML data to WeChat.

What is mode one?

Mode 2

Directly call the createUnifiedOrder() function to generate a prepayment transaction order, and generate a QR code from the code_url in the result for the user to scan.

What is Mode 2?

Official account payment (JS API)

Generate JS API payment parameters and send them to the page

 wxpay . getBrandWCPayRequestParams ( {
	openid : '微信用户 openid' ,
	body : '公众号支付测试' ,
    detail : '公众号支付测试' ,
	out_trade_no : '20150331' + Math . random ( ) . toString ( ) . substr ( 2 , 10 ) ,
	total_fee : 1 ,
	spbill_create_ip : '192.168.2.210' ,
	notify_url : 'http://wxpay_notify_url'
} , function ( err , result ) {
	// in express
    res . render ( 'wxpay/jsapi' , { payargs : result } )
} ) ;

Web page call parameters (take ejs as an example)

 WeixinJSBridge . invoke (
	"getBrandWCPayRequest" , < % - JSON . stringify ( payargs ) % > , function ( res ) {
		if ( res . err_msg == "get_brand_wcpay_request:ok" ) {
    		// success
    	}
} ) ;

middleware

The merchant server handles WeChat callbacks (express is an example)

 // 原生支付回调
router . use ( '/wxpay/native/callback' , wxpay . useWXCallback ( function ( msg , req , res , next ) {
	// msg: 微信回调发送的数据
} ) ) ;

// 支付结果异步通知
router . use ( '/wxpay/notify' , wxpay . useWXCallback ( function ( msg , req , res , next ) {
	// 处理商户业务逻辑

    // res.success() 向微信返回处理成功信息，res.fail()返回失败信息。
    res . success ( ) ;
} ) ) ;