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The cardmember says they never authorized this transaction, made without the physical card present.
Someone used stolen card details to place an online or phone order the real cardmember never authorized.
The core online-fraud code for Amex — AVS/CVV match and delivery verification are your main defense.
AVS/CVV match results, device/IP data, and delivery confirmation to a verified address.
Submit AVS/CVV match proof, device/IP consistency, and delivery confirmation to the cardmember's known address.
Not enforcing AVS/CVV match or allowing shipment to an unverified address without review.
Enforce AVS/CVV matching and flag address mismatches for manual review.
Flat monthly fee, keep 100% of what you win.
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