Just for clarification, Apple Pay does not require an online authorisation, as an Apple Pay transaction is not considered as unverified - the customer verifies themselves through their fingerprint in place of their PIN number.
This is why Apple Pay is permitted to support transactions of theoretically unlimited value, where it is properly supported by retailers (for example, Waitrose accept up to £250 by Apple Pay, I believe Boots are the same, and in an Apple Store you can pay an unlimited amount using is).