I do this via the tools at the account holders. I always chuckle when I'm paying for something and the phone dings with a spending update before I've even left the cash register.
What else would I use a pocket computer (smart phone) for? Posting on PoA?
Setting up alerts is easy. Most people don't bother and then are surprised when an almost completely insecure (as a whole) electronic transaction system "surprises" them with illegal activities they didn't notice.
That plus a written budget makes it pretty easy to tell when something just went through that was fraudulent. My wife and I usually text each other about the same time when something does make it past the card issuer's fraud detection systems.
"Don't care but did you just spend $100?"
"Nope, was going to ask you the same thing."
"Alright, I'll call..."
Of course we haven't talked about the other form of scammer yet. The places like LifeLock and their ilk...
Loved that the CEO who always plastered his SSN on their advertising claiming he was safe because he used the service, had more than ten major incidents of identity theft (not to mention having his butt fired by the BoD and criminal charges) to his name... before that house of cards came tumbling down.
And people still hand them money...