Applet starts wechat payment

Preparation conditions ：

1.  You must complete applet certification     Check the certification related instructions

 2. After applet authentication , Can be in the small program background , Wechat payment menu bar , Apply for wechat payment .

Front end payment process ：

1. Use  wx.login  Get temporary login credentials code, And send it to   Back end   obtain openId

wx.login({

  success (res) {

    if (res.code) {

      //  Initiate request , Exchange for openId

      wx.request({

        url: '',

        data: {

          code: res.code

        }

      })

    }

  }

})

2. take  openId And the corresponding required product information   Send to back end , Exchange for   Back end signature   Etc

wx.request({

  url: '',

  data: {

    openId: '',

    num: 1,

    id: '111'

  }

})

3. The information returned by the applet after receiving the back-end signature （ It must include initiating wechat payment  wx.requestPayment  Parameters of ）, Call again  wx.requestPayment  Initiate wechat payment

 

wx.requestPayment({

  //  Time stamp 

  timeStamp: '',

  //  Random string 

  nonceStr: '',

  //  Unified order interface returns  prepay_id  Parameter values 

  package: '',

  //  Signature type 

  signType: '',

  //  Signature 

  paySign: '',

  //  Call successful callback 

  success () {},

  //  Failed callback 

  fail () {},

  //  Interface call end callback 

  complete () {}

})

Be careful ： In the above information timeStamp、nonceStr、prepay_id、signType、paySign  It is recommended that all parameters be returned by the server （ This will ensure the consistency of signature data as much as possible ）, The applet side does nothing

 

 

Back end technical support ：

1. According to the applet end through wx.login Acquired code, Return to current user openId

2. according to openId And related product information ( Goods details ： amount of money 、 Quantity, etc ), Call wechat official unified order interface , Return the relevant data after signature .