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Appended to every outbound URL (e.g. utm_source=fb).
[optional]
creative_features
Hash<String, String>
Advantage+ creative enhancements: partial map of Meta creative feature keys (snake_case) to enroll status, forwarded as degrees_of_freedom_spec.creative_features_spec. Unspecified features default to OPT_OUT.
[optional]
multi_advertiser
String
Meta only. Multi-advertiser ads: whether Meta may show this ad alongside other advertisers' in one unit. Meta auto-enrols since Aug 2024, so send OPT_OUT to leave. It is a top-level creative field, NOT a `creativeFeatures` key — Meta rejects it there.