| ChallengeInd | Indicates whether a challenge is requested for this transaction, see values Codes - ChallengeInd | No | AN2 | Version 21 or higher (3DSV2) |
| threeDSReqPriorAuthData | Data supports a specific authentication process. In the current version of the specification this data element is not defined in detail, however the intention is that for each 3DS Requestor Authentication Method, this field carry data that the ACS can use to verify the authentication process. In future versions of the specification, these details are expected to be included. | No | AN2048 | For Future usage Version 21 or higher (3DSV2) |
| threeDSReqPriorAuthMethod | Mechanism used by the Cardholder to previously authenticate to the 3DS Requestor, see values Codes - threeDSReqPriorAuthMethod | No | AN2 | Recommended. Version 21 or higher (3DSV2) |
| threeDSReqPriorAuthTimestamp | Date and time in UTC of the prior cardholder authentication | No | AN16 | Recommended. Version 21 or higher (3DSV2) |
| browser | Parameters of the shopper web browser. | Conditional | Object browser | Mandatory in verifyEnrollment when the buyer is connected to a web browser either within a computer or a mobile (web app integration). Version 21 or higher (3DSV2) |
| sdk | Parameters of the shopper application. | Conditional | Object sdk | Mandatory in verifyEnrollment when the buyer is connected to a mobile application and the merchant is using a 3DS SDK (in app integration).
Version 21 or higher (3DSV2) |
| threeDSMethodNotificationURL | Fully qualified URL where the merchant receive the notification of the completion result of the 3DS Method (server to server notification) | Yes | AN255 | Version 21 or higher (3DSV2) |
| threeDSMethodResult | Indicates whether the 3DS Method successfully completed. - I: Value for the first call to verifyEnrollment
- Y: 3DS method succeeded
- N: 3DS method failed or no response received.
| ConditionalYes | AN1 | Must be present if the ACS required the buyer's browser to connect to the 3DS method. Version 21 or higher (3DSV2) |
| ChallengeWindowSize | Preconfigured sizes are width x height in pixels of the window displayed in the Cardholder browser window. Values accepted : - 01 = 250 x 400
- 02 = 390 x 400
- 03 = 500 x 600
- 04 = 600 x 400
- 05 = Full screen
| No | N2 | Version 22 or higher (3DSV2) |