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How do credit card banks detect fraudulent transactions without requiring a travel advisory?
One bank is more willing to risk losses and customer hassle in exchange for lower processing costs than the other bank is. It's strictly a business decision. Regarding how they detect suspicious transactions: Patten detection based on your past usage history. I've gotten calls asking me to confirm that I just placed a large order with a company I'd never bought from before, or in a country that I haven't previously visited, or...