Just got off the phone with the rep from Square Enix...I would say everyone to save the trouble and DO NOT call because they really don't know what the issue is. They rep told me that he would think that it's because too many people waited until the trial period ended (which is today) to pay that the system had an overload and stopped taking payments altogether. Which...seems like it is possible. But first the log in and now the payments? Square Enix really didn't have any expectations for this game did they lol.

So yea, do bother calling them it's a waste of time and will get you very frustrated. Either go buy a game card and solve it that way, or just wait until Square Enix issues a statement (probably going to give more free playing time...)