Guess I won't see an answer
over here.
Why do security scan your PYOBP? Is it just a basic check to prove you have a valid document and haven't photo-shopped something together (i.e. the bar code references your PNR somehow and gives the guy a go/no-go for you?)
Or does it tie into BA's system to let them know of your arrival in the airport?
Or perhaps something else?
Or some/all of these?