CloudPay.unifiedOrder()

Support end ： Cloud functions 2.0.2

Unified order

explain

The merchant calls the interface in the applet to generate the pre payment transaction list in the background of wechat payment service , Return the correct prepaid transaction and raise the payment .

This interface is the same as the original interface of wechat payment （ file ） The difference is ：

• Private secure link , Certificate free management , Signature free calculation
• Merchant number filled in sub_mch_id Field , Applet / official account appid fill sub_appid Field
• Do not fill in the following fields ：mch_id、appid、sign、sign_type
• Interface input and return values are JSON instead of XML

Key parameter description

Cloud development related The key parameters explain ：

• Callback function settings ：envId  and  functionName  Cloud function used to set the asynchronous notification callback after receiving payment
• Return field  payment： This object is called on the applet side  wx.requestPayment  Required information

Input and return protocol of the cloud function receiving payment result callback

See Payment result callback cloud function Protocol .

Parameter description

sceneInfo.storeInfo Object description *

Return value description

The following fields are in the returnCode by SUCCESS When you come back

The following fields are in the returnCode and result_code All for SUCCESS When you come back

Error code

Sample code

// 1、  Cloud function code , initialization 
const cloud = require('wx-server-sdk')
cloud.init({
  env: cloud.DYNAMIC_CURRENT_ENV
})


//2、 Unified order 
exports.main = async (event, context) => {
  const res = await cloud.cloudPay.unifiedOrder({
    "body" : " Autumn  TIT  shop - The supermarket ",
    "outTradeNo" : "1217752501201407033233368018",
    "spbillCreateIp" : "127.0.0.1",
    "subMchId" : "1900009231",
    "totalFee" : 1,
    "envId": "test-f0b102",
    "functionName": "pay_cb"
  })
  return res
}


// 3、 Applet payment （ Applet code ） , And judge the payment result 
wx.cloud.callFunction({
  name: ' Function name ',
  data: {
    // ...
  },
  success: res => {
    const payment = res.result.payment
    wx.requestPayment({
      ...payment,
      success (res) {
        console.log('pay success', res)
      },
      fail (err) {
        console.error('pay fail', err)
      }
    })
  },
  fail: console.error,
})