The specific operation steps are as follows:
1. First, open the mobile phone to find WeChat in the mobile application interface, open WeChat and log in to the main interface of WeChat.
2. After entering the main interface of WeChat, click "My" in the lower right corner.
3. After entering the "My" interface, click "Pay".
4. In the payment interface, find the option of "More Functions" and click Enter.
5. In the limited promotion module, find the "Health Code".
6. Click to enter, and then click "Update Health Code".