# Release History
source: https://developer.mastercard.com/account-validation/documentation/release-history/index.md

## Release Notes {#release-notes}

When we intend to make changes to this API, we will provide advance notice in the [Mastercard Send Release Notes](https://developer.mastercard.com/mastercard-send/documentation/send-release-notes/). To stay current on API updates, be sure to visit that page regularly.

## Release History {#release-history}

Notable changes specific to this API are listed below (in reverse chronological order). The Release Date is when the change takes effect in Production.

|   Release Date   | API Spec Version |                                                                                                                                                                                                                                                                                                                                                                                                                                                                         Notes                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
|------------------|------------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| 23 January 2026  | 3.0.0            | Updated the API specification server domains to the new RNTZ domains. See [Release Notes](https://static.developer.mastercard.com/content/mastercard-send/release-notes/mastercard-send-release-notes-25.4.pdf#page=3).                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
| 6 August 2025    | 2.0.0            | * Adjusted the API specification to remove the `X-Openapi-Clientid` header parameter and change the 'More fields' example payload to an 'All fields' example payload that shows all possible fields. * Enhanced the service to support optional payload encryption for the MTF and Production environments, see [Release Notes](https://static.developer.mastercard.com/content/mastercard-send/release-notes/mastercard-send-release-notes-25.1.pdf#page=15). **NOTE:** The API is now accessed using keys created with the **Mastercard Account Validation** API service, instead of the **Mastercard Send** API service that was used when this Account Validation service launched. If you have been using keys from a **Mastercard Send** project, see the [Support](https://developer.mastercard.com/account-validation/documentation/support/index.md) FAQ: *I can no longer access the API using a Mastercard Send project. What has changed?* |
| 9 June 2025      | 1.0.2            | Updated API specification links to documents on the Technical Resource Center (TRC).                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |
| 21 November 2024 | 1.0.1            | Updated API specification descriptions for `transferAcceptor.id` and `transferAcceptor.name` to state those values can be alphanumeric special.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
| October 2024     | 1.0.0            | API service launched.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |

## Announcements {#announcements}

Mastercard regularly publishes announcements relating to Operations, Rules/Standards, and other categories that might impact Mastercard Send API customers. To help you identify which announcements might be relevant to your business, we provide an Announcements spreadsheet. See [Announcements](https://developer.mastercard.com/mastercard-send/documentation/announcements/).