Account-wide totals for the requested window — one set of metric values covering the whole account.

Metrics: metrics is keyed by metric id, with metric_names giving each id's display name. Ids come from GET /open/v1/ad-accounts/{account_id}/metrics; pass them in metrics to add custom conversions, custom events and Atria custom metrics on top of the default set. null means no data for that metric in the window. Figures can differ slightly from the ad platform's own reporting.

Returns: code=0 success; code=40001 invalid account_id or workspace context missing; code=40401 when the account does not exist or belongs to a different workspace; code=50001 when the upstream platform API is unavailable.