Overview

1. Initialize the API with appId, apiKey, merchantId, callbackUrl
2. Add products with this API
3. Get Payment URL like weixin://wxpay/s/An4baqw and a base64 image representation for QR code payment

Usage

var WechatPayment = require('wechatpayment');

var config = {
	"appId":"wxb1092a6bbd7e4a0d",
	"apiKey":"9GIbwNM80deG5N941lxQGB8dRbFcafh6",
	"appSecret":"9c1f6bc015a7f46dd099c1b867442c9",
	"merchantId":"1462732419",
	"callback":"http://example.com/wechat/callback"
};
var wechatPayment = new WechatPayment(config);

wechatPayment.setOrderNumber("1337")
wechatPayment.setPaymentTitle("My Test WeChat Online Payment"); // will be shown on clients WeChat APP
wechatPayment.setBuyerIp("192.168.99.100");
wechatPayment.addProduct("testproduct1", "Test Product Name", "My Great product", 1, 999) 
wechatPayment.getPaymentRequest().then(function(data){
  console.log(data)
},function(err){
  console.log(err)
})

Methods

setOrderNumber(orderNumberString)

Set the order number you created in your shopping cart system for your reference

setBuyerIp(ipString)

Set the IP from your client get from your shopping cart system for your reference

setPaymentTitle(titleString)

Set the title displayed on client WeChat APP

addProduct(sku, name, description, quantity, price)

Arguments

• Product SKU / model .. or whatever..
• Product Name
• Product Description
• Quantity
• Price in (Currency in Chinese Yuen / RMB)

getPaymentRequest() (Promise)

Finally, invoke to get URL / base64 QR Image to you

Sample Success Return

{ return_code: 'SUCCESS',
  return_msg: 'OK',
  appid: 'wx12345',
  mch_id: '12345',
  nonce_str: 'example12345',
  sign: '1234567',
  result_code: 'SUCCESS',
  prepay_id: 'wx201712345example',
  trade_type: 'NATIVE',
  code_url: 'weixin://wxpay/bizpayurl?pr=example',
  base64Image: 'data:image/gif;base64,.....' }

Now, you can use base64Image within <img src="data:image/gif;base64....."/> Alternatively you can redirect you client on code_url (by window.open(URL)) to invoke WeChat App from clients' mobile phone