|Yesterday, Blizzard unveiled a new program to allow players to purchase games and services. Called "Battle.Net Balance", this program allows players to add to their balance using a variety of payment methods. This non-refundable balance can then be used at the Blizzard Store to purchase games and game time.
Quoting [Blizzard's Announcement|http://us.battle.net/d3/en/blog/4434651/New_Battlenet_Balance_Feature_Now_Available-2_6_2012#blog]:
Battle.net Balance is now live! As we announced previously, Battle.net Balance is a new feature that gives players an alternate way to purchase Blizzard digital products and services directly through their Battle.net accounts. Players are now able add to their Battle.net Balance using a variety of payment methods, and then use that balance toward Blizzard Entertainment products and services such as World of Warcraft game time; paid services, such as realm transfers and character name changes; digital versions of select Blizzard games, including Diablo II and StarCraft II; and in-game pets and mounts. In the near future, players will be also able to use Battle.net Balance for the digital World of Warcraft Battle Chest and WoW digital upgrades. In addition, with the upcoming launch of Diablo III, players will have the option to use Battle.net Balance to buy and sell items in the games currency-based auction house.
For more information about this program, please visit the Battle.Net Balance FAQ.