Blizzard is taking this real-money launch very seriously. To them, account security is of utmost importance. In order for players to access their Battle.net Balances, players will be required to have a Battle.net Authenticator attached to their account.
“While we understand that this creates an extra step for players during the login process, we believe this added layer of account protection will help foster a safer auction house environment for all of our players,” Blizzard said in a recent post on the Diablo III forums.
The real money auction house is scheduled to arrive later this month for Diablo III.