| Value | Description |
|---|---|
| Y | Authentication/account verification successful |
| N | Not authenticated/account not verified; transaction denied |
| U | Authentication/account verification could not be performed; technical or other problem as indicated in ARes or RReq |
| A | Attempts processing performed; not authenticated/verified, but a proof of attempted authentication/verification is provided |
| C | Challenge required; additional authentication is required using the CReq/CRes |
| R | Authentication/account verification rejected; issuer is rejecting authentication/verification and request that authorization not be attempted |
| D | Challenge required; decoupled authentication confirmed |
| I | Informational only; 3DS Requestor challenge preference acknowledged |