-Places like Gamestop will sell local 60 day time cards that you can buy in store. EB games or the like equivalent in respective countries.
-Amazon sells the prepaid 60 day time cards, as well as Square-enix's website digitally (sometimes).
-Green dot is usually the most recommended, since it's accepted ALMOST everywhere over normal debit cards. Green Dot cards are sold at retailers such as CVS, Rite-Aid and Wal-Mart. The latest version of this prepaid debit card, the Green Dot Reloadable Prepaid MasterCard or Visa, has a higher monthly fee — but a lower activation fee — than previous versions. Unlike older Green Dot cards, this one has no free ATM access.

Using Green dot, what I've seen (and heard recommended) is using Green dot as a prepaid > attaching it to a middle man account (paypal) and then add your paypal to the account.

The ONLY down side about payments is that it becomes a Spriggan bomb if you're ever short on payments. And they're not fun to reverse if you're late on adding funds to your prepaid card and/or wallet before the subscription time is up. The easiest solution would be to purchase a prepaid 60 day time card, which equals 2 months worth anyways, and add that to your mogstation. This way there's no hassle with payments late or stress, and you'll know by notification on email if and about the time it happens! Saves me a lot of worries with bills myself lol.