Returns the list of built-in metadata fields provided by the system (e.g., document type, source URL).
API Key authentication. For all API requests, include your API Key in the Authorization HTTP Header, prefixed with Bearer. Example: Authorization: Bearer {API_KEY}. Strongly recommend storing your API Key on the server-side, not shared or stored on the client-side, to avoid possible API-Key leakage that can lead to serious consequences.
Knowledge base ID.
Built-in metadata fields.
List of system-provided metadata fields.