Bulk create or update SAR financial institutions, agents, and branches, identified by their external identifier: existing entries are updated and new ones are created. Processing order is: standalone FIs → agents → branches. Each entry is independently validated — partial success is a valid outcome.

You need the account-level "Account has access to FinCEN SAR reports" permission and the user-level "Manage settings such as pre-fill data for FinCEN SAR reports" permission to use this endpoint.