Some of the younger users most likely do not have debit cards, but do receive prepaid gift cards as a gift for holidays or just to get them. This is the only way they could buy VIP and some might want to use that money to support world of potter. They might not be able to use their parents debit card and this would be their only option. Without it, several users could be missing out on VIP because they can't buy it, because we don't support Prepaid Gift Cards.
So maybe allowing one for now? American Express Prepaid Gift Cards, so that at least there is one option available. Because it can take a lot of work to include all of them.
Customer support service by UserEcho