Update 10:45 am EDT: The maintenance is over. All functions of the account center are available again.
Greetings,
We will bring down the Account Center for maintenance tomorrow, Monday April 23rd, at 8 am EDT (14:00 CEST). 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 12 pm EDT (18:00 CEST).
Thank you for your understanding.