Although you're right that Apple Pay is cryptographically verified, you may be surprised to know these two things:

1. you can charge any amount - the amount shown in the Apple Pay UI is arbitrary

2. you can make multiple charges, also of any amount (e.g. for a subscription)

It is tokenized, but practically it's just a card number you can charge like any other card number. It's also typically linked back to the original PAN, so multiple payments can be correlated together with ease