Returns high-level aggregate metrics for the admin dashboard: total accounts, balances, and platform-wide KPIs. Requires internal-admin role.
Bearer JWT for user-facing flows (Bearer eyJraWQ...), or the literal string NONE when authenticating via API key.
"Bearer eyJraWQ..."
API key for server-to-server flows, or the literal string NONE when authenticating via JWT.
"pcx_abc123_xxxx"