I tried 4 different credit cards (one was a visa debit) and none of them worked on the Mog Station for buying either Crysta, or for adding a payment method for a subscription. I got both 401 and 601 errors.

I went to the store and got an Ultimate Game Card. With a $20 card I was only able to buy 1800 ($18 worth) of Crysta, because when used on the mog station they added a fee to my transaction, so I ended up paying $19.54 for that, with 44 cents leftover as ultimate points. Definitely not convenient or cost effective to use the card.

If it weren't for all these problems, I would have bought the 180 days, but instead I went with the entry level sub.

Really hoping they can fix these credit card issues before my next renewal.