Stepup Type Values

Name	Description
CHOICE	Returning CHOICE on the StepupResponse will present a selection screen to the consumer when multiple credentials have been returned. Returning CHOICE on the StepupResponse and only one credential, will result in the selection screen being skipped unless your implementation is set to force the selection screen in all cases.
OTP	Returning OTP on the StepupResponse will send OTP messages to all SMS and Email credentials provided.
KBA	Knowledge Based Authentication. Currently only one question/answer is supported.
BIOMETRIC	All biometric authentication including fingerprint and facial recognition.
OUTOFBAND	Any other authentication type that occurs outside the 3DS VCAS session.
OTP_AND_KBA	Two factor authentication. This will allow VCAS to present both OTP and KBA to the consumer during the transaction. This will send OTP messages to all SMS and Email credentials present.
OTP_CHOICE_AND_KBA	Two factor authentication. This will allow VCAS to present both OTP and KBA to the consumer during the transaction. This will display a selection screen to the consumer when multiple OTP credentials are present. The selection screen will only be for OTP credentials.
OUTOFBAND_EMBEDDED	Returning OUTOFBAND_EMBEDDED on the StepupResponse will initiate an Out-of-Band authentication flow embedded within the VCAS ACS URL allowing the issuer to manage the content that is presented to the end cardholder.