We are in the process of making our systems compliant with new security requirements that GUilD WarS gOLD MasterCard have put in place for Maestro debit cards. Unfortunately, this means we will no longer be able to accept Maestro as a payment method in the in-game store for an indeterminate period of time.
This change will be implemented in the build that will go live next week and we encourage all players who usually use Maestro as their only payment method, and were GUiLd wArS thinking of purchasing character slots in the in-game store, to do so as soon as possible. The Guild Wars campaigns, the Bonus Mission Pack and the PvP Access Kit will still be purchasable through the PlayNC Store using the Maestro payment option.