AFAIK Passbook does not do this, or at least no company has integrated into Passbook yet. I still don't understand how Passbook works. In the US there is only a handful of apps that use Passbook, and even then, the one I do own (United), I still can't figure out "what it does".
"...or at least no company has integrated into Passbook yet..."
Huh? I have tons of apps that use Passbook? I use Passbook daily for rewards cards and loyalty cards? Here is a link to a huge list of apps integrated into Passbook: http://en.wikipedia.org/wiki/Passbook_(application)
I have personally used it tons of times with my Starbucks card, Walgreens card, and for tickets to get into concerts.
It's actually quite handy. I wish a lot more places would use it.
For example, when flying to Germany I had the Lufthansa app. An hour before the flight it popped up on my home screen and stuck there. (As in, no cancel.)
Then when I go to the airport, I swiped it and the lady just scanned it in - and me and my girlfriend both had our tickets printed.
