I can't find information on how Apple will specifically implement it, but Sweetwater has a similar thing (they're a music gear shop) and it's auto-billed. You'r

I can't find information on how Apple will specifically implement it, but Sweetwater has a similar thing (they're a music gear shop) and it's auto-billed. You're essentially signing up for a 3 or 6 month subscription service where the monthly bill is 1/3 or 1/6 of the total cost of goods.