vads_threeds_auth_type

Description	Indicates the authentication type of the cardholder. Output field, returned in the response (IPN and Return URL).
Format	enum
Possible values	“Empty” if the buyer is not correctly authenticated. FRICTIONLESS: cardholder authentication without interaction with the ACS. Value returned only in 3DS v2. CHALLENGE: interactive cardholder authentication (entering an OTP or replying to a series of questions). Value returned in 3DS v2. DATA ONLY: authentication handled by the DS without client interaction. This is an option of the EMV 3D Secure protocol, available only with Mastercard.
Category	Authentication of cardholder.