I had $10 Blizzard balance, and I wanted to purchase the new Hearthstone expansion. But $10 is obviously not enough, so I wanted to add to it using my debit account. There is no option for that, so I tried adding to my blizzard funds instead. Then it said it would take up to 3 days to complete the transaction. However, since the new battlegrounds mode is only available for the next week or so, time is precious. Please allow the addition of payments onto a blizzard balance!