On: Everyone going to World Cup must have this app, ex...

[omnimus]

You would be surprised how well app screenshot in full screen with the qr code works.

Seen this many times with covid vaccination passes.

[vidarh → omnimus]

No idea about this app, but presumably that's the reason why quite a few apps show animations and a rotating code word alongside the QR codes, so staff can easily spot that kind of thing.

[BoorishBears → omnimus]

Doesn't work for these tickets since they're generating new underlying values as time passes.

Even Costco has self-modifying barcodes now, so covid vaccination passes are behind on the times.