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Comment by wlesieutre | Hacker News Reader

That support document doesn't elaborate the types of codes it can scan, here are the ones I'm aware of:

    URLs -> Safari
    Locations -> Maps
    Contacts -> Contacts
    WiFi SSID/password -> Join network

To reduce confusion more: The QR scanner only works on the camera accessed via the lock screen, but not from the actual "Camera.app"

Just tested and this is not the case. In iOS 12 and iPad OS 13 it definitely works in the camera app launched from home screen.