Update 10:15 am EDT: The maintenance is over. All functions of the account center are available again.
We will bring down the Account Center for a short maintenance tomorrow, Thursday March 15th, at 9am EDT (14:00 CET). 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 11:45am EDT (16:45 CET).
Thank you for your understanding.