3DS ReferenceProtocol & field guide

EMV 3-D Secure · Core specification 2.3.1.1

Challenge Window SizechallengeWindowSize

Dimensions of the challenge iframe that has been displayed to the Cardholder. The ACS shall reply with content that is formatted to appropriately render in this iframe to provide the best possible user experience. Preconfigured sizes are width x height in pixels of the challenge iframe displayed in the Cardholder Browser window.

Explore this field with transaction context

Allowed and reserved values

ValueMeaningIntroduction tag
01250 x 400Not tagged
02390 x 400Not tagged
03500 x 600Not tagged
04600 x 400Not tagged
05Full screenNot tagged

Introduction tags are shown where recorded. An absent tag does not establish when a value was introduced.

Message inclusion

Baseline inclusion. Effective requirements depend on transaction context. Check the field’s conditions and FAQ qualifications; select channel and category in the explorer.

MessageBaseline inclusion
CReqRequired

Format and scope

Type: String · Length: 2 characters · Minimum length: 2 · Maximum length: 2

Source components
Not specified
Device channels
02-BRW
Message categories
01-PA, 02-NPA

Version history

No field introduction version is tagged in the dataset. Introduction tags are curated metadata, not a full history of changes. Compare versions and understand coverage.

Source and review status

EMV_3DS_CoreSpec_v2.3.1.1_20230530.pdf, Table A.1, PDF pages 242

Source review status: extracted. Carried-forward material has not acquired a new verification claim.

Source document fingerprint

EMV_3DS_CoreSpec_v2.3.1.1_20230530.pdf

6fdf0aba3fc1a765f96b74dad4069d1e189969f38f0023647021687daf589d6b

Official EMVCo specifications · Methodology and coverage limits