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SCIM is a REST-like protocol and works over HTTP(S). The identity provider sends provisioning instructions to registered applications whenever changes occur by calling REST endpoints in the provisioned application (e.g. Jira or Confluence). This can be far more efficient than API Connectors which rely on full synchronization/snapshotting. In SCIM, only specific changes need to be transmitted once initial sync has been established, giving it far betteer better scalability characteristics, and is recommended for larger user directories.
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