SCIM (System for Cross-Domain Identity Management) is crucial when selling to larger enterprises with complex IT needs and hundreds to thousands of users that need access. It improves security, automates provisioning and access management, and simplifies billing processes. SCIM works by connecting an application to a customer's existing Identity Provider (IdP), such as Okta, allowing automatic user account creation, deprovisioning, and access management based on group memberships. The benefits of SCIM include: 1. Automatic deprovisioning to eliminate security vulnerabilities. 2. Pre-provisioning user accounts instead of manually adding and removing users. 3. Automated access management instead of manually assigning groups and roles. 4. More accurate, simpler billing instead of manually tracking seats. 5. Syncing additional user attributes to bring useful external data into an app.