# Specification Change Log
source: https://developer.mastercard.com/authentication-facilitator/documentation/api-reference/spec-change-log/index.md

Occasionally the Authentication Facilitator API specification requires an update for clarification of existing functionality and can occur at any time. No backwards breaking changes will be introduced, and the requests and responses returned from the service will not change without prior notice.

| Version |                                                                                                                                                                              Description                                                                                                                                                                              |                                                                   Release Info                                                                    |   |
|---------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|---------------------------------------------------------------------------------------------------------------------------------------------------|---|
| 1.1.1   | * Removed the reference to the deprecated RSA PKCS#1 v1.5 encryption scheme from the `encryptedKey` parameter description in the /deliverAuthenticationCode API. * Updated the `oaepHashingAlgorithm` parameter to be a mandatory field within the `encryptedPayload` object in the /deliverAuthenticationCode API. * Removed contact details from the API reference. | [August 2026](https://developer.mastercard.com/authentication-facilitator/documentation/pre-release-notes/august_2026_release_notes/index.md)     |   |
| 1.1.0   | Enhanced the Deliver Authentication Code API by adding new fields and updating existing parameter to support AES Galois/Counter Mode (GCM) cipher mode for enhanced security.                                                                                                                                                                                         | [March 2026](https://developer.mastercard.com/authentication-facilitator/documentation/pre-release-notes/march_2026_pre_release_notes/index.md)   |   |
| 1.0.3   | Documentation improvements for better readability.                                                                                                                                                                                                                                                                                                                    | NA                                                                                                                                                |   |
| 1.0.2   | Documentation improvements for better readability.                                                                                                                                                                                                                                                                                                                    | NA                                                                                                                                                |   |
| 1.0.1   | Added new optional parameters to the Token Requestor object in the Deliver Authentication Code API.                                                                                                                                                                                                                                                                   | [August 2021](https://developer.mastercard.com/authentication-facilitator/documentation/pre-release-notes/august_2021_pre_release_notes/index.md) |   |

### Previous Versions {#previous-versions}

## v1.1.1 {#v111}


API Specification: `https://static.developer.mastercard.com/content/authentication-facilitator/swagger/deliver-authentication-code-v1.1.1.yaml`

## v1.1.0 {#v110}


API Specification: `https://static.developer.mastercard.com/content/authentication-facilitator/swagger/deliver-authentication-code1.1.0.yaml`

## v1.0.3 {#v103}


API Specification: `https://static.developer.mastercard.com/content/authentication-facilitator/swagger/deliver-authentication-code1.0.3.yaml`

## v1.0.2 {#v102}


API Specification: `https://static.developer.mastercard.com/content/authentication-facilitator/swagger/deliver-authentication-code1.0.2.yaml`

## v1.0.1 {#v101}


API Specification: `https://static.developer.mastercard.com/content/authentication-facilitator/swagger/deliver-authentication-code1.0.1.yaml`