Apple Pay launches by double pressing the home button, then your fingerprint authenticates. You can do it from the lock screen, no having to open an app.
As I said earlier, businesses don't need to 'support' this for it to work. When a store asks for your method of payment, you can simply say 'debit' or 'credit' and tap your phone to the machine, as if it were your card.
Another benefit with this will be in app purchases, apps (line Cineplex) can integrate it as a method of payment, and you can use the info stored on your phone... A lot more secure than all the different apps out there having your credit card info stored on their end.
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