Update the Xiaomi mobile phone system to MIUI 12, and open the settings in the mobile phone; Find more settings in Settings, and click Enter; Then select shortcut key settings; Select the back click setting in the shortcut gesture.
Tap the back two or three times, select any one, and click the setting on the right; Finally, select the function that needs to be opened and set it as Alipay health code. Wechat health code is not supported at present.