What should I do if the reverse scan code has expired?

Reapply.

. Reverse QR code scanning changes from "I scan you" to "You scan me", which helps the elderly's daily convenience. When card holders are doing shopping or nucleic acid testing, they only need to show the card and let the other party scan the QR code, and the data will be displayed in real time. Sent to the public security big data center.

The offline code physical card is valid for 180 days. It will automatically expire after expiration and needs to be reapplied.