I'm seeing diagnostic techniques in there that I did not find in the Apple supplied literature. You will probably want this when you decide to make a Passbook pass.
Passbook is intended to collect "the stuff in your pocket", e.g. Payment cards, rewards cards, coupons, tickets, boarding passes, in a handy app that helpfully shows you the right one at the right time.
Once someone has your pass in their passbook you can send updates, such as special deals.
BillGuard now lets you add your credit cards to Passbook and monitor balances and recent transactions. It also notifies you to any suspicious charges made using your card.
