3D Secure Authentication: The Security Layer That’s Reshaping Online Payments in 2026 TL;DR: 3D Secure (3DS) authentication adds an extra verification layer between you, your bank, and the merchant during online payments. The latest version (3DS2) uses risk-based analysis to verify transactions invisibly in 95% of cases, only prompting you when fraud risk is detected. It’s mandatory in Europe under PSD2 and increasingly adopted in the US to combat card-not-present...
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