A wishlist is a creator's list of content you can buy one at a time. You pay once and get that item — there is nothing recurring about it.
A wishlist is a list of things a creator has made and put up for sale individually. You buy one, you get that one, and nothing repeats.
What you get
Every item names what it is before you pay, and that is what is delivered — a file, a link, or a message from the creator. It arrives on your purchases page and in your email receipt, both of which stay available afterwards.
Paying
You do not need an account to buy from a wishlist. Signing in is still worth it: your purchases page is what keeps every item you have bought in one place, and without an account there is nothing for a purchase to attach to except the receipt email.
Prices
A wishlist item can be priced anywhere from £4.99 to £500.00. The total you are shown at checkout is the total you pay.
It is not a subscription
Nothing recurs and there is nothing to cancel. If you want something regular from a creator, that is a membership or recurring content instead.