Definition
3-D Secure is a protocol (branded Visa Secure, Mastercard Identity Check, and others) that lets the card issuer authenticate the shopper during an online purchase. Version 2 shares over 100 data points so most transactions are approved silently in a frictionless flow; only risky ones see a challenge such as a one-time passcode.
When a transaction is authenticated with 3DS, liability for fraud chargebacks shifts from the merchant to the issuer. In the EU and UK, Strong Customer Authentication under PSD2 makes 3DS mandatory for most online card payments, with exemptions for low-value and low-risk transactions.
Example
A $900 first-time purchase from a new device in another country triggers a 3DS challenge. The shopper approves it in their banking app, the payment is authenticated, and any later fraud dispute is the issuer’s liability.
How HL Hunt handles it
HL Hunt applies 3DS adaptively: exempt where allowed, frictionless where possible, and challenge only when the Fraud Agent’s risk score demands it, so you get the liability shift without the conversion drop.