I bloody refuse to have a QR app on phone. I make them get out the pen and paper. They can never comprehend it. I tell them my phone won't fit more apps. I do it out of protest... Clearly my oppo has 512 GB 😁
But to be honest, I like having docs on my phone rather than carry around a filing cabinet with tickets, ID etc.
He' i ain't got a birth certificate on me now ,.. ;-)