Help with QR code to open my fron door please

i have a smart lock that can be locked/unlocked via HA, very cool.
i see plenty of tutorials on how to scan NFC tag to unlock door. but is there a way to scan QR code to unlock for my phone without NFC?
this guide is so bare, i have no idea what to do. so i have a QR code, can it be anything? to any website or just a text like “unlock” written in qr? then what?

Check out my project here, maybe it could help you Opening gate with QR-Code for AirBnb Guests