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Absolutely no one whose job it is to scan barcodes gets paid enough to give a single fuck about how that barcode was created

There's some places like railroads that I've seen care about this so that people don't share tickets (like monthly pass types)

I use Pass4Wallet for several loyalty/gym memberships.

In my experience, if the code scans, the code scans.

It works fine if scanned by a machine though (ticket gate, self checkout etc.)

I've used a third party app for this for a UK weekly pass train ticket you could only buy physically, but if you buy it on a train rather than at a station they can't print you a ticket with a magnetic strip and they have to give you one with a barcode (technically an Aztec code), which you can then scan onto your phone and use at the gate. But I kept the original ticket with me too and would use that if a person asked to inspect it