It's not normally a single transaction that triggers the fraud detection, but a small initial transaction (say <$20) then one that's much larger - the first tra

It's not normally a single transaction that triggers the fraud detection, but a small initial transaction (say <$20) then one that's much larger - the first transaction validates the card works, the second one is the money grab. So if you sell something small, you'll be used to validate newly bought cards before they go off and buy $1000 of something else.