Create a campaign via Meta Marketing API

Steps

1. Obtain a System User access token with ads_management permission scoped to the ad account.
2. POST to /v{API_VERSION}/act_AD_ACCOUNT_ID/campaigns with fields: name, objective (e.g. OUTCOME_TRAFFIC or OUTCOME_LEADS), status (PAUSED recommended), and special_ad_categories (empty array if none apply).
3. Capture the returned campaign id and create an ad set by POSTing to /act_AD_ACCOUNT_ID/adsets with the campaign_id, targeting spec, optimization_goal, billing_event, bid_amount or bid_strategy, and daily_budget or lifetime_budget.
4. Create an ad creative by POSTing to /act_AD_ACCOUNT_ID/adcreatives with object_story_spec or asset_feed_spec.
5. Create the ad by POSTing to /act_AD_ACCOUNT_ID/ads with the adset_id, creative (referencing the creative id), and status.
6. Use GET /act_AD_ACCOUNT_ID/campaigns?fields=id,name,status to verify the hierarchy was created correctly.