What is Credit Card Fraud?

Credit card fraud is the unauthorized use of card credentials or physical cards to purchase goods, services, or cash. It occurs in card‑present (cloned magstripe, tampered terminals) and card‑not‑present (stolen numbers online) channels, as well as account takeover of issuer portals for cash advances and profile editing. The ecosystem is mature—attackers have tooling, playbooks, and markets to monetize quickly.

Signals: micro‑auth waves (carding), AVS/CVV mismatch with “clean” networks, geovelocity impossible for humans, device fingerprints reappearing across many identities, and purchase clusters in resell‑heavy categories. Disputes cluster by BINs, campaigns, and merchants with lax friction.

Defense: layered controls—CVV/AVS, selective 3DS, device graphs, BIN/country scoring, and velocity by identity and hardware. Supplement with anomaly detection on checkout rhythm and cart composition; reserve suspect orders for secondary review. Where fraud bleeds into account creation, payout edits, or recovery flows, anchor users with strong identity verification and secure the checkout layer—see payment fraud prevention.

Goal: keep approvals high and losses low by calibrating friction to context—not by penalizing every customer for the sins of a few.