When underage children log in to Sichuan Tianfu Pass, they must first open the WeChat of adults, enter Sichuan Tianfu Health Pass, and click the home page.
Log in to an adult account.
Then there is a health code on the right of the first line above.
Click to enter the ID number of the bound minor child.
It can be used after binding. When necessary, just open the adult's and find the minor.