My friend who doesn't have a credit card asked me to use mine to add funds to his battle.net account so he can buy items in Diablo 3 (he pays me cash in return). I would associate my card to his account, put some money, and then remove the card.
He gave me his email & pass, but when I tried to enter battle.net, it locked his account because, of course, I was entering his account from a different IP that he regularly uses.
What can I do to accomplish this without having to give to him my credit card number and security number? I can't go to his house either because it's far away.