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

## Release Notes {#release-notes}

The Mastercard Send releases are quarterly. Mastercard will share advance Release Notes to help notify participants of intended changes. For the release dates and Release Notes, see [Mastercard Send Release Notes](https://developer.mastercard.com/mastercard-send/documentation/send-release-notes/).

To stay current on all Mastercard Send 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. Changes prior to release 20.R1 (25 May 2020) are not included.

Ensure you check the main Release Notes page (see section above) for any other changes that may affect use of this API.

|     Release Date      |                                                                                                                                                                                                               Notes                                                                                                                                                                                                               |
|-----------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| 23 January 2026 25.4  | 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).                                                                                                                                                                                                           |
| 23 September 2024     | Improved the API specification, including adding sample response payloads.                                                                                                                                                                                                                                                                                                                                                        |
| 20 March 2024         | Corrected the API specification to match the API: * `address` object = Added 'required' indicator. * `first_name` and `last_name` = Changed length to 1-30. * `address.line1` and `address.line2` = Changed length to 1-40. * For the fields above and `address.city` = Removed characters ÀÁÂÃÄÅÇÈÉÊËÌÍÎÏÑÒÓÔÕÖÙÚÛÜÝàáâãäåçèéêëìíîïñòóôõöùúûüýÿ from the list of accepted characters.                                            |
| 26 November 2021      | Improved the field descriptions and attributes in the API specification.                                                                                                                                                                                                                                                                                                                                                          |
| 24 August 2021 21.R2  | We are adding an optional `canada_domestic_indicator` field to the API request so that Canadian participants who have elected to include Debit Mastercard in scope can provide the value 'true' when checking such cards. Otherwise, Mastercard will decline the transaction. See [Release Notes](https://static.developer.mastercard.com/content/mastercard-send/release-notes/mastercard-send-release-notes-21.R2.pdf#page=10). |
| August 2021 21.R2     | Moved the Account Verification documentation content to its own set of documentation pages (these pages). The content was previously part of the documentation pages for Mastercard Send Person-to-Person and Mastercard Send Disbursements. See [Release Notes](https://static.developer.mastercard.com/content/mastercard-send/release-notes/mastercard-send-release-notes-21.R2.pdf#page=2).                                   |
| 25 May 2021 21.R1     | To ensure consistent behavior for participants, the service was enhanced to return the 'NOT_VERIFIED' response value in all cases when optional values are not provided in the request message. See [Release Notes](https://static.developer.mastercard.com/content/mastercard-send/release-notes/mastercard-send-release-notes-21.R1.pdf#page=7).                                                                                |
| 12 January 2021       | Updated the API specification (presented in the documentation pages) from Swagger 2.0 to OpenAPI 3.0, adjusting the server base URLs and paths.                                                                                                                                                                                                                                                                                   |
| 13 October 2020 20.R3 | Added the `merchant_verification_value` field so that participants can include the Merchant Verification Value (MVV) in the API request when checking a Visa token. See [Release Notes](https://static.developer.mastercard.com/content/mastercard-send/release-notes/mastercard-send-release-notes-20.R3.pdf#page=5).                                                                                                            |
| 25 August 2020 20.R2  | Made expiration date optional for pan schema in the `account_uri` field. See [Release Notes](https://static.developer.mastercard.com/content/mastercard-send/release-notes/mastercard-send-release-notes-20.R2.pdf#page=2).                                                                                                                                                                                                       |

## 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/).