Personal health code has expired. Click OK to return to the main interface of WeChat, click City Service, and then click Health Code to enter the applet. Here you are prompted that your health code has expired. Click Update Now, fill in the health information, check I have read it, and finally click Submit. After the submission is successful, a new page will pop up, and click Generate Health Code Now.
Note that the validity period of the personal health declaration card is 14 days. Need to reapply after expiration; "Personal health declaration card" and "Sukang code" have the same effect; Red, yellow and green correspond to high, medium and low risk levels respectively.