My son just received an SMS message (1 month later) that his CBA credit card was over it's limit ($2000), he thought that was strange as he hasn't used it for 2 years. Checked online via the app and it had 10 x $200 transactions on the one day from Apple Pty Ltd Sydney. He rang CBA and they are investigating.
Will update with how they did it, if we are able to find out from CBA.
My bank Westpac call me within minutes and advise of funny transactions (albeit after the fact).
Cool story