Your users are stored in some old SQL server, or LDAP repository, or worse. The credentials are stored in LDAP but the accounts can be found in a custom CRM that marketing selected many years ago.
The Curity User Management Service is a fully fledged SCIM 2.0 server, or more accurately, a SCIM proxy. It serves as the umbrella API for your user management, being fully OAuth protected and expose a single standardized CRUD API that your applications and services can interact with.
Using the Curity OAuth server, the APIs are protected from the start.
The User Management Service can be configured with fine grained authorization, allowing different users and applications access to different operations and user-data.
Commonly administrative applications can access many users, and all others can only operate on themselves.
User CRUD (Create Read Update Delete) is needed everywhere. The Customer service application needs to update users, other applications needs to read attributes about users, and batch services needs to sync users between domains. Using SCIM 2.0 there is now a standard REST API for all of these operations.
All active sessions using OpenID Connect in a single view.
Using a single API you can list and manage the active sessions for a user. Sessions can be revoked when needed. Let the user view its own session or let an admin view the user's sessions.