Every new line item needs to declare whether or not they will serve Eurpoean Union (EU) political ads. Display & Video 360 API and SDF uploads that don't provide declarations will fail. See our deprecations page for more details.
[null,null,["Last updated 2025-09-09 UTC."],[],["This content outlines how to create a `FirstAndThirdPartyAudience` via a POST HTTP request to `https://displayvideo.googleapis.com/v3/firstAndThirdPartyAudiences`. The request requires the `advertiserId` query parameter. The request body should contain an instance of `FirstAndThirdPartyAudience`, which is only supported for `CUSTOMER_MATCH_CONTACT_INFO` and `CUSTOMER_MATCH_DEVICE_ID` audience types. Successful creation returns a new `FirstAndThirdPartyAudience` instance in the response body. The process requires `https://www.googleapis.com/auth/display-video` authorization scope.\n"],null,[]]