Creating Campaigns, Ads, and Audiences on Meta

The full build chain, end to end. Meta's structure is strict and nested:

Campaign (objective, budget if CBO)
  -> Ad Set (audience, placement, budget if ABO, optimization goal, schedule)
    -> Ad (references a creative + an ad set)
      -> Ad Creative (media, copy, CTA, link, url_tags)
Custom / Lookalike Audiences (built at the account level, referenced by ad sets)

Golden rules (always):

• Everything is created PAUSED. Never set a campaign, ad set, or ad to ACTIVE without explicit user confirmation. Spend only starts when the user says go.
• Budgets are in cents. 5000 = $50.00.
• Build order: audiences first (ad sets reference them) -> campaign -> ad set -> creative -> ad.
• Full field-level schemas (every param, every enum) are in ../api-reference.md. This guide is the flow; the api-reference is the dictionary.