The Visa Secure Program Guide was updated, adding 12 data fields to be effective from 12 February 2024. Feedback and analysis led to a reduction in required fields: five for browser transactions and three for in-app transactions. The changes aim to provide more preparation time for the ecosystem. Exemptions include non-payment and 3DS requestor-initiated transactions. Merchants must ensure the required data fields for EMV 3DS AReq messages by 12 August 2024.