Update 10:00 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, Wednesday March 20th, at 5am EDT (10:00 CET). During the maintenance you will not be able to change subscription or redeem game codes.
At the moment we anticipate the Account Center to be back online at 10:00am EDT (15:00 CET).