Directory Server (DS) Definition.

Core component of the 3-D Secure protocol, operated by each scheme. It maintains the directory of enrolled BINs and routes authentication messages between the merchant’s 3DS Server and the issuer’s ACS. For any given PAN, it knows which ACS to query and which protocol version to use. If the ACS is unavailable, it can return an attempt response.

See also

→ 3-D Secure→ ACS

Where this term appears

GuideTokenization and card authentication around the worldGuide3-D Secure 2 and SCA exemptionsCourse3DS2, SCA, and payment success rates

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