Update 10:20am EDT: The Account Center is back online.
We will bring down the Account Center for a short maintenance tomorrow, Thursday May 24th, at 9:30am EDT (15:30 CEST). During the maintenance you will not be able to change subscription, redeem game codes or transfer characters.
At the moment we anticipate the Account Center to be back online at 12pm EDT (18:00 CEST).
Thank you for your understanding.