Create a Meta Advantage+ campaign using the unified three-lever automation structure via the Marketing API

Steps

1. Configure campaign-level spend using a supported bid strategy (LOWEST_COST_WITHOUT_CAP, COST_CAP, LOWEST_COST_WITH_BID_CAP, or LOWEST_COST_WITH_MIN_ROAS) to enable the Advantage+ budget lever.
2. Create the campaign with objective OUTCOME_SALES, OUTCOME_APP_PROMOTION, or OUTCOME_LEADS via POST /act_{ad_account_id}/campaigns; do not set smart_promotion_type, since the legacy AUTOMATED_SHOPPING_ADS/SMART_APP_PROMOTION values are no longer creatable as of Marketing API v25.0.
3. On the ad set, set targeting_automation.advantage_audience to 1 and specify only geo_locations targeting to enable the Advantage+ audience lever (or use individual targeting options with relaxation enabled for a more controlled setup).
4. Leave placement targeting and exclusions unset on the ad set to enable the Advantage+ placement lever across all eligible Meta placements.
5. Query the campaign's read-only advantage_state, advantage_budget_state, advantage_audience_state, and advantage_placement_state fields to confirm all three levers report ENABLED and the campaign reflects ADVANTAGE_PLUS_SALES/APP/LEADS.