Scheduled Pre-Release Notifications (PRNs)

Refer to the table below for information of the latest Thredd Pre-Release Notifications (PRNs) and the scheduled system release dates for scheduled releases. For previous pre-release notifications, see Pre-Release Notifications for Past Releases.

This page displays PRNs with changes affecting the technical documentation. For a full list of PRNs, including PRNs prior to 2021, please contact the Operations team.

PRN Reference	Description	Related Guides	Scheduled Release
PRN-326	Included 5C and 9G card status code descriptions for Minimum Approval Calculation changes.	EHI Guide (XML) EHI Guide (JSON) Card Status and Response Codes Guide	1st October 2026
PRN-295	Retired Raidiam as our CA (Certificate Authority) in favour of AWS CA. For applications or services using Thredd-issued certificates (API/mTLS integrations, authentication flows, or UIs), action will be required to remain connected.	Connecting to Thredd Guide IAM Migration Guide	14 October 2026
PRN-330	Updated Customisable Card Number endpoints to use a HTTP 202 response code instead of HTTP 200. Added the new 121 webhook event code for card creation statuses. Existing integrations will need to be updated for the new status code and webhook event notification.	Customisable Card Numbers Webhook Event Codes	20th October 2026
PRN-325	Amended description of AVS response codes. R and W have been removed. U has been updated.	EHI Guide (XML) EHI Guide (JSON)	21st October 2026
PRN-329	Additional Amount DE54 now supports up to 12 different amounts, and the character length is now 240.	EHI Guide (XML) EHI Guide (JSON)	21st October 2026
PRN-307	Included Mastercard Reason Codes 7640 to 7649 for fee collection.	EHI Guide (XML) EHI Guide (JSON) Global Transaction Reporting Guide Transaction XML Reporting	23rd October 2026
PRN-308	Added new `P73` Scheme Transaction Identifier Values to support merchants enrolled in the Global Reach Acquiring Program.	EHI Guide (XML) EHI Guide (JSON)	23rd October 2026
PRN-310	Added new `C09` and `F09` Scheme Transaction Identifier Values.	EHI Guide (XML) EHI Guide (JSON)	23rd October 2026
PRN-311	Added MCCs `3306`, `3884`, `3885` and `3886` to Merchant Category Codes.	EHI Guide (XML) EHI Guide (JSON)	23rd October 2026
PRN-324	Added the following new fields to the GetTransaction message for Visa Data Only (VDO) data: `ThreeDsAuthResultCode`, `AuthenticationMethod`, `CavvKeyIndicator`, `EciIndicator`, `CavvType`.	External Host Interface Guides	27th October 2026
PRN-331	Included the following fields within the PDS (Private Data Subelement) fields for First Presentment/1240 clearing messages in the GetTransaction message: `EnhAcceptorGeo`, `EnhAcceptorName`, `EnhAcceptorLogoUrl`, and `EnhDigitalRcptUrl`	External Host Interface Guides	27th October 2026
PRN-332	Added the `TspId` field to the Get Transaction message.	External Host Interface Guides	28th October 2026
PRN-261	For French OSMP-enabled customers using non-3DS payments, a velocity check is now performed on same-card, same-merchant transactions.	PSD2 and SCA Guide	3rd November 2026