Fetches a Meta ad creative by ad_id or creative_id and returns the raw creative payload
Fetches a Meta ad creative by ad_id or creative_id and returns the raw creative payload. Use when editing an existing ad’s creative content. Workflow: meta_ads_get_ad_creative -> modify the payload -> meta_ads_create_ad_creative (returns a new creative_id) -> meta_ads_replace_ad_creative (attaches it to the ad).