scanning QR code from walgreens

Hello all. well I finally have the vaccine proof I need in a QR code. I can see the qr code if I click View, but then I don't know what to do. I asked siri, and it just let me try to use the flashlight. Is there a demo somewhere of doing such a behavior so I know how to do this? Thanks so much. Note, I'm not trying to start any debate, I was just trying to figure out how to get this done independently.