The API Version 3 only adds the license manager’s endpoints to WordPress’s API, and a third-party authentication plugin is required to authenticate users. The plugin JWT Authentication for WP REST API adds JWT authentication to WordPress’s API.

All the endpoints were tested with the previously mentioned JWT authentification plugin; please check the documentation on wordpress.org/plugins/jwt-authentication-for-wp-rest-api and developer.wordpress.org/rest-api/using-the-rest-api/authentication for more details.