Question Re: Crysta

I play FF via STEAM and make payments and buy other items via Steam Wallet, I was wondering would I be able to buy a prepaid CC and use that to link to PayPal to buy the Crysta to be able to transfer a character to another world. I do NOT want to link my bank card to PayPal.

Well, they certainly accept credit cards. I'm not aware of them excluding prepaid ones, but I haven't had reason to try one myself here.

Why add PayPal in between rather than just buying Crysta directly with the pre-paid credit card?