Glossary

3-D Secure authentication

Extra layer of cardholder verification during the purchase, which shifts liability for fraud to the issuing bank.

3-D Secure, now in version 2, is the protocol that inserts an additional check between checkout and approval. Depending on the calculated risk, the issuing bank asks the cardholder for confirmation, through an app or a code, before authorizing.

The most important effect isn't technical, it's about liability. In a successfully authenticated transaction, the fraud dispute becomes the issuer's responsibility, not the seller's. This is what's called the liability shift.

The cost is friction. Every extra step in the checkout drags down conversion, and that's why the sensible decision isn't to turn 3DS on or off for everything, but to apply it by risk tier: suspicious transactions or high-ticket ones go through authentication, the rest go straight through.

Fraud rules set too tight reject good customers, set too loose they hand the account to chargebacks. The right setting is not a configuration, it is a weekly read of your own numbers.
Wellington CostaGlobal Payments Specialist

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Written by Wellington Costa Global Payments Specialist

Writes about payment infrastructure, checkout conversion and chargeback reduction. Works directly with digital product sellers, affiliates and creators selling to more than 40 countries through Mundpay.