get_account_insights
Retrieve performance insights aggregated across the entire ad account. Returns a list response (data[] with first_id/last_id/has_more for paging). Each row carries id, start_time, end_time, plus the projected fields such as impressions, clicks, spend, ctr, cpc, cpm, readable_time, campaign_name, ad_group_name, and ad_name. Combine aggregation_level, sort, and limit to rank entities (e.g. the top ad by clicks). Monetary metrics (spend, cpc, cpm) are in the account's currency as decimal values, not micros.