# GitLab backend An abstraction layer between the CMS and [GitLab](https://docs.gitlab.com/ee/api/README.html) ## Code structure `Implementation` for [File Management System API](https://github.com/netlify/netlify-cms/tree/master/packages/netlify-cms-lib-util/README.md) based on `Api`. With [Editorial Workflow](https://www.netlifycms.org/docs/beta-features/#gitlab-and-bitbucket-editorial-workflow-support) uses merge requests labels to track unpublished entries statuses. `Api` - A wrapper for GitLab REST API. `AuthenticationPage` - A component uses [lib-auth](https://github.com/netlify/netlify-cms/tree/master/packages/netlify-cms-lib-auth/README.md) to facilitate OAuth, PKCE and implicit authentication. Look at tests or types for more info.