Your store can now take Apple Pay and Google Pay. When a customer signs up, or updates their payment info later, they can tap once to save their card instead of typing the number. Faster signup, fewer people bailing partway, and the card still bills on your normal weekly schedule.
Nothing changes in how you bill. Apple Pay and Google Pay save the card the same way a typed card does, so your weekly charges (box plus fees, plus any add-ons that week) run exactly like they do now.

To turn it on, go to Payments → Apple Pay & Google Pay and register the web domain your store runs on. Register your www. and non-www. addresses separately if you use both. Once a domain is registered, the buttons show up on their own at signup and on the payment-info page for customers whose phone or browser supports them (Apple Pay in Safari on Apple devices, Google Pay in Chrome).
This is for stores on Stripe for now. If you're on Authorize.net, it's coming soon.