The SCIM standard was created to simplify user management in the cloud by defining a schema for representing users and groups and a REST API for all the necessary CRUD operation
Please evaluate the open source project, https://github.com/PowerDMS/Owin.Scim. I've been leading this development effort. While it's missing a few features that Microsoft has implemented quite well, it is far more complete in most other areas of scim. See if it fits your needs and we welcome all feedback to help shape the future of owin.scim.