Full creative (text copy + image / video assets + CTA) plus per-ad metric values over the requested window — the drill-down for a single ad returned by GET /open/v1/ad-accounts/{account_id}/ads.

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 path parameters or workspace context missing; code=40401 when the account or the platform_ad_id is not accessible to the caller; code=50001 when the upstream platform API is unavailable.