Returns a list of all system Domains that the authenticated user has security access to view. Domains represent the core data entities in the Origami system (e.g., Claim, Policy, Location, Transaction, etc.), including Client Defined Entities (custom entities).

This endpoint is primarily used as a discovery tool — it allows API consumers to look up the exact domain names needed for use in other API operations such as:

/{domain}/Query
/{domain}/Fields
/{domain}/{id}
/{domain}/Upsert

Any other entity-based endpoints where a domain path parameter is required.

Security & Filtering
The returned list is security-filtered.

• Core securable domains — All system domains where the user has View security permission are included.
• Explicitly allowed domains — Certain domains that are explicitly allowed for metadata-only access are appended (if not already present).
• CheckPayment domain — If the user has access to the Transaction domain, the CheckPayment domain is automatically added to the results (if not already present).