PSD2, SCA and 3D Secure 3D Secure (3-domain structure or 3DS) is a security protocol that helps reduce fraud in online credit and debit card transactions. Help Center 3DS Continuation Requests Help Center MMS Settings For SCA Help Center Payment Services Directive 2 (PSD2) and Secure Customer Authentication (SCA) Help Center How does 3DSv1 differ from 3DSv2? Help Center 3DSv2 MMS Preferences Help Center 3DS: Benefits of version 1.0, 2.1 and 2.2 Help Center 3DSv2 Liability Shift Help Center SDKs Help Center Error Codes Help Center Test Cards Help Center Currency Codes Help Center Country Codes Help Center Language Codes