Release Notes {#rn-general}
===========================

These release notes cover all releases to the production server for the week ending October 10, 2025.

Announcements {#rn-announce}
============================

These are the announcements for October 10, 2025.

Webhooks Updates {#webhooks-validations-decommission}
=====================================================

We added new validations for version 1 of webhooks:

* Only alpha-numeric data and spaces are allowed in the name field of newly created or updated subscriptions. Existing version 1 subscriptions are not affected unless they are updated.
* Most webhooks fields for newly created or modified subscriptions do not accept HTML tags. Existing version 1 subscriptions are not affected unless they are updated.
* The securityType field in `Create` and `Patch` requests accepts only one of the following values: `key`, `oAuth`, or` oAuth_JWT`.

{#webhooks-validations-decommission_ul_zrz_34c_qgc}  
Version 1 will be decommissioned in April 2026. We recommend that you begin using [webhooks version 2](https://developer.cybersource.com/api-reference-assets/index.md#webhooks "").

Features Introduced This Week {#rn-features}
============================================

No customer-facing features were released this week.

Fixed Issues {#rn-fixed-issues}
===============================

**Transaction Management** \| RM-40183
--------------------------------------

Description
:
This release fixes an issue which prevented users in the Business Center from performing the following actions:

    * Viewing PANs
    * Creating tokens
    * Modifying grid table preferences (account-level users)
    * Seeing only the products and services enabled for your account (account-level users)
    {#rn-fixed-issues_ul_qh3_2hr_xgc}

Audience
:
Users of Transaction Management in the Business Center.

Technical Details
:
None.

Important Dates
:
Released to production October 6, 2025.

Known Issues {#rn-known-issues}
===============================

**REST API SDK Reduced Performance** \| EPS-33372
-------------------------------------------------

Description
:
There is a known issue that the Cybersource REST API SDK for .NET Standard can cause reduced performance or connection errors during periods of high transaction volume.

Audience
:
Merchants using the Cybersource REST API SDK for .NET Standard.

Technical Details
:
The SDK is creating new `HTTPClient` instances for every new transaction request. This can cause:

    * Increased DNS resolution overhead.
    * Lack of connection pooling.
    * Potential `SocketException` errors under heavy load, which occur during events such as the ballots sale.


    The planned fix will update the SDK to reuse the created `HTTPClient` instance.

Workaround
:
None.

**Invalid Network Tokens in CAS Environment** \| EPS-34142
----------------------------------------------------------

Description
:
There is a known issue that certain network tokens containing device PANs (DPANs) are invalid and unusable for testing in the CAS environment. The planned fix will result in the removal of the invalid network tokens to ensure accurate testing.

Audience
:
GPAP merchants using the CAS environment for testing network tokens with DPANs.

Technical Details
:
None.

Workaround
:
None.