Apply Pay just shifts the registration and need to agree to a TOS to another party. Whatever happened to just "here's some cash money"? I've already got a bank account and credit cards, they already have my business. Just let me use them to buy your product.
The trick with Apple Pay is that supposedly you have already accepted Apple's TOS and they already have your cards so you do not need additional registrations.
In Apple's grand, glorified vision that should be the only one you need.
Because to use Apple Pay you also need to have your cards in your Apple Wallet. Cant remember exactly the onboarding process for this but I guess there are a few checkboxes to check.