Billingator
Return unused turns
A card purchase can be returned for 14 days after payment: the turns of it you have not used come off the wallet, and their price goes back to the card you paid with. Turns are counted as spent from free turns first, then from your oldest purchase.
To return unused turns, open Refund unused turns in the app you bought them for: it brings you here with a link of your own, good for 30 minutes. A wallet code alone does not open this page, so nobody else can return your purchases.