[zo1]

QR codes have variable-level error-correction, from 7-30%.

https://en.wikipedia.org/wiki/QR_code#Error_correction

[KGIII]

Thanks! As mentioned above, I am so glad I'm not one of the folks who has to implement this stuff.

I'd ask why they didn't just improve QR codes, instead of making yet another format, but I'm not sure I want to know the answer(s).