First, open my WeChat app interface and click Settings. Then choose to click on the city service, click on the epidemic prevention and health code in the city service interface, and wait for the health code to be selected. You can choose to switch applicants in the health code interface.
The "health code" is based on real data and can be generated by citizens or people who have returned to work through their own online declaration and background audit. As an individual entering and leaving electronic certificate locally, the QR code can be declared once, which is universal in the whole city.