ad_accounts:read.insights bucket).ad_account_ids are Meta account ids (ad_account.meta_id / insights account_id). Optional act_ prefix is stripped.start_date and end_date are inclusive YYYY-MM-DD, max 30 days.allowed_meta_ids returns 403 FORBIDDEN_ACCOUNT.fb_ad_account_insights_by_country. Items are { account_id, date_start, country, spend }.