An ad set field that shows the default action attribution window (e.g. "28d_click") used for that ad set. Each ad set can have its own attribution setting, and if not overridden it defaults to the account's setting. This field can return values like 7d_view, 28d_click, mixed (if multiple windows exist) or skan (for iOS 14 SKAdNetwork campaigns). It's only returned if use_unified_attribution_setting=true.
GET /{ad-set-id}?fields=attribution_setting // returns something like "attribution_setting": "7d_click"
