1. Update Xiaomi's mobile phone system to MIUI 12 and open the settings in the mobile phone.
2. Find more settings in Settings, and then click Enter.
3. Then select the shortcut key settings.
4. Select the back click setting in the shortcut gesture.
5. Tap the back twice or three times, select any one, and then click Settings on the right.
6. Finally, select the function to be enabled and set it as Alipay health code. Wechat health code is not supported at present.