1. The generation of QR code

First, you need to read Tencent's official documents in detail

https://developers.weixin.qq.com/doc/offiaccount/Account_Management/Generating_a_Parametric_QR_Code.html

There are two types of QR code creation requests

Temporary two-dimensional

https://api.weixin.qq.com/cgi-bin/qrcode/create?access_token=TOKEN

POST数据格式：
json POST数据例子：{"expire_seconds": 604800, "action_name": "QR_SCENE", "action_info": {"scene": {"scene_id": 123}}} 
jon  POST数据创建字符串形式的二维码参数：{"expire_seconds": 604800, "action_name": "QR_STR_SCENE", "action_info": {"scene": {"scene_str": "test"}}}

Permanent QR code

https://api.weixin.qq.com/cgi-bin/qrcode/create?access_token=TOKEN

POST数据格式：
json POST数据例子：{"action_name": "QR_LIMIT_SCENE", "action_info": {"scene": {"scene_id": 123}}} 
json POST数据创建字符串形式的二维码参数： {"action_name": "QR_LIMIT_STR_SCENE", "action_info": {"scene": {"scene_str": "test"}}}

Parameter Description:

Understanding: The understanding of action_name, when using the QR code for promotion, the parameter of this band is the id of the promoted person

The creation of the QR code is a public post request, so I will not write a test method here, I will call it directly with postman

The parameters used are:

{"action_name": "QR_LIMIT_STR_SCENE", "action_info": {"scene": {"scene_str": "你好"}}}

{
    "ticket": "gQHL8DwAAAAAAAAAAS5odHRwOi8vd2VpeGluLnFxLmNvbS9xLzAyZlI5TDk2THBmN0QxMDAwMGcwN1EAAgQmQT5gAwQAAAAA",
    "url": "http://weixin.qq.com/q/02fR9L96Lpf7D10000g07Q"
}

2. Obtaining the QR code

The interface address of the QR code acquisition call is as follows

https://mp.weixin.qq.com/cgi-bin/showqrcode?ticket=TICKET

Reminder: TICKET remember to perform UrlEncode (I call it directly through the web page)

Use the following url to access

https://mp.weixin.qq.com/cgi-bin/showqrcode?ticket=gQHL8DwAAAAAAAAAAS5odHRwOi8vd2VpeGluLnFxLmNvbS9xLzAyZlI5TDk2THBmN0QxMDAwMGcwN1EAAgQmQT5gAwQAAAAA

The QR code is shown in the figure below:

3. Scanning of QR code

Every time a QR code is scanned, a request will be sent to the background. The request is divided into two types

For more information, please refer to

https://developers.weixin.qq.com/doc/offiaccount/Message_Management/Receiving_event_pushes.html

Scanned by people who did not follow the WeChat official account, the request sent to the server is as follows

The following is processed by my object, in fact it is an xml

{Ticket=gQHL8DwAAAAAAAAAAS5odHRwOi8vd2VpeGluLnFxLmNvbS9xLzAyZlI5TDk2THBmN0QxMDAwMGcwN1EAAgQmQT5gAwQAAAAA, CreateTime=1614693308, EventKey=qrscene_你好, Event=subscribe, 
ToUserName=gh_7c94dc7e2130, FromUserName=orxnH5x5ctnmrdrWQ80DsDRqn2nM, MsgType=event}

Scanned by people who follow the WeChat official account, the information sent to the server is entered as follows

{Ticket=gQHL8DwAAAAAAAAAAS5odHRwOi8vd2VpeGluLnFxLmNvbS9xLzAyZlI5TDk2THBmN0QxMDAwMGcwN1EAAgQmQT5gAwQAAAAA, CreateTime=1614693382, EventKey=你好, 
Event=SCAN, ToUserName=gh_7c94dc7e2130, FromUserName=orxnH5wNRLvz2DfNTopTGcL4y9ic, MsgType=event}

After that is the process of receiving messages.

09- QR code generation and scanning

1. The generation of QR code

2. Obtaining the QR code

3. Scanning of QR code

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