Simple thinking about the login process of WeChat web version scan code

Presumably everyone is familiar with the login process of the web version of WeChat, as shown in the following figure:

So how do web and mobile terminals implement this login authorization? ?

After some thoughts, my feeling should be the following process:

 

Of course, there are many factors that need to be considered when realizing it, such as security, timeliness, privacy protection, etc. There are no specific developments here. There are no difficult requirements in the world, as long as you are willing to think about special research!