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Here's an article from The Conversation about how they detect credit-card fraud.
Not as informative as I was hoping it might be, but interesting points about how they compare current activity to our usual patterns.
When we were in Chicago last summer my better half got a message from a credit card company telling him they had denied some charges. The odd thing was -- we were in Chicago, and the charges that were denied were in Michigan, not too far from our normal haunts........ So they were allowing charges in a place we don't usually go, and denying them "back home".........
Perfectly properly. Which led me to wonder -- how did they know?
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