Check Enrollment Service

When the customer places an online order, the the customer information is sent to the Verify Enrollment Response service (VERes) to verify that the card is enrolled in a payer authentication program.

If the card is enrolled, the VERes reply field indicates enrollment. The reply also contains the URL of the Access Control Server and the PAReq.
If the card is not enrolled, decline the payment and ask the customer for another form of payment.