# Pre-release Notes September 2026
source: https://developer.mastercard.com/mdes-customer-service/documentation/release-history/pre-release-sep2026/index.md

Alert: **Pre-release specifications are provided for reference and planning purposes only. Minor modifications may occur, and final specifications will be published in the official release notes closer to the MTF release date.**

## Release Change Summary {#release-change-summary}

In support of the Mastercard Token Authentication Framework, MDES Customer Service will introduce new capabilities for issuers to manage device binding for passkey authentication. Issuers can query the binding status of a payment card to a consumer device and update the binding status to ensure accurate maintenance within Mastercard systems.
Enhancements include:

1. A new endpoint to query binding status
2. A new endpoint to update binding status

## Dates for Introduction of Functionality {#dates-for-introduction-of-functionality}

* MTF - 7 September 2026
* Production - 25 September 2026

## Change 1 - Binding Search {#change-1---binding-search}

This change introduces support for account binding search to help issuers retrieve binding records for an account PAN.

API Reference: `GET /{id}/bindings/searches`

A new error code to indicate when the binding information could not be found:

```json
{
  "Errors": {
	"Error": [
	  {
		"Source": "INPUT",
		"ReasonCode": "BINDING_NOT_FOUND",
		"ErrorCode": "E0010200",
		"Description": "Binding information cannot be found for the requested search criteria."
	  }
	]
  }
}
```

## Change 2 - Binding Status Update {#change-2---binding-status-update}

This change introduces support for binding status updates so issuers can send an update the account binding status.

API Reference: `GET /{id}/bindings/statusupdate`

## Impact {#impact}

### Existing Implementations {#existing-implementations}

Existing implementations can continue current integrations without disruption. Issuers that need these capabilities should add support for the new binding search and binding status endpoints.

### New Implementations {#new-implementations}

New implementations should include support for both account binding searches and binding statuses if account binding use cases are in scope.

### Sandbox Validation {#sandbox-validation}

For testing in Sandbox:

* Validate binding search requests and responses for expected account binding records.
* Validate binding status updates for expected status values and error handling.

### References {#references}

* [Mastercard Token Authentication Framework Guide](https://trc-techresource.mastercard.com/r/bundle/m_mc_taf_g_en-us/page/d/en-US/kof1745837091084.html)