As B2B company we would like to share our private documentation with 3rd party clients that have no access to Gitbook and provide them temporary access to documentation. This feature was available in legacy version (as access-keys). Alternatively provide an option to share the book by email to 3rd party that will be able to login seamlessly with basic login. Unlisted feature is partially provide solution for this request since it is not possible to revoke access from specific client.