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Release Notes

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

Announcements

These are the announcements for
October 10, 2025
.

Webhooks Updates

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
    .
Version 1 will be decommissioned in April 2026. We recommend that you begin using webhooks version 2.

Features Introduced This Week

No customer-facing features were released this week.

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)
Audience
Users of Transaction Management in the Business Center.
Technical Details
None.
Important Dates
Released to production October 6, 2025.

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.