post
https://sandbox-api.viantinc.com/{basePath}/creative
Creates specific types of creatives. Only CustomTag creatives can be created.
When adding a new creative, ID must be null or omitted; creativeType and creativeSubType must be provided; advertiserId or campaignId must be included (both may be included). Only HTML/JS based CustomTag banners can be created, so the caller must set:
"creativeType": "banner", "vast", "native", "mraid", "vpaid", "vast_with_vpaid"
and
"creativeSubtype": "htmlTag"