Some Korean banks already do this - My girlfriend gets a call from her dad every time she uses his credit card number online, as he gets a text message notifyin

Some Korean banks already do this - My girlfriend gets a call from her dad every time she uses his credit card number online, as he gets a text message notifying him it has been used for card-not-present transaction :) He doesn't need to authorize it, but getting a notification that it has happened at all is better than nothing.