Everything you need to know about the iOS 7 Passbook, the one-stop repository for all your cards, tickets, passes, and vouchers on iPhone.
Passbook, introduced in iOS 6, is a Home screen app that acts as a single repository for all the movie and sports tickets, loyalty and payment cards, boarding passes, coupons, and other passes generated by all the compatible apps on your iPhone or iPod touch. (Passport is not currently supported on the iPad). When an app generates a Passbook pass, it's taken out of the app and loaded into Passbook. Then, whenever you need it, you can simply go to Passbook, tap it, get its barcode scanned, and be on your way. Location and time services even allow Passbook to notify you about relevant passes just when you need them -- like when you enter a store or your gate changes at the airport -- and expiry dates, balances, and other highly visible information on the passes make them even more convenient.
With iOS 7, Passbook gained the ability to scan QR codes. Built on the Pass Kit frameworks, it's conceivable Apple could add additional functionality over time, including mobile payments over existing technologies like Bluetooth LE, or potentially even tap-to-pay if they ever decide to include NFC in future iPhone or iPad devices.