update_payload | object or string | Yes | - | Raw LinkedIn post partial-update body, sent to LinkedIn as-is. Use LinkedIn’s documented shape: {“patch”: {“set": \{...}}}. LinkedIn only allows updating: commentary (intro text), contentLandingPage (destination URL), contentCallToActionLabel, lifecycleState, and the sponsored name/status via a nested patch: \{"patch": \{"adContext": \{"set”: {“dscName”: ”…”}}}}. Headline and attached media cannot be updated (LinkedIn limitation; create a new ad instead). Accepts a JSON object or JSON string. |