{"id":"7838dbf4-0224-4481-83a3-3190b023104d","task":"Build a first-party audience segment in DV360 using the Audience API","domain":"developers.google.com","steps":["Use the Display & Video 360 REST API firstAndThirdPartyAudiences resource to create a new first-party audience; set the audienceType to FIRST_PARTY and define the audienceSource (e.g., YOUTUBE, GOOGLE_ANALYTICS, or PIXEL).","For pixel-based audiences, reference the Floodlight activity tag or Google tag that fires on the relevant conversion or page-visit event.","Set the membership duration (membershipDurationDays) to specify how long a user remains in the audience after qualifying; the maximum supported duration is 540 days.","Link the audience to a line item's audienceTargetingConfig by including the audience segment ID in the includedFirstAndThirdPartyAudienceGroups field.","Allow 24–48 hours for the audience to populate before expecting targeting to take effect; newly created segments start with zero members and will not serve until the minimum size threshold is reached.","Use the audienceGroups structure to combine multiple segments with AND or OR logic; AND (intersection) logic requires all segments to be in the same group, while OR (union) logic uses separate groups."],"gotchas":["DV360 first-party audiences built from Floodlight tags share the same data as Google Ads remarketing lists only when the advertiser's Floodlight is linked to a Google Ads account; without this link, the audiences are not available cross-platform.","Setting membership duration to the maximum (540 days) does not guarantee users stay for that period; users who clear cookies or use different devices may exit the audience earlier, especially on browsers with ITP restrictions.","The minimum audience size required before a segment is eligible for targeting is not publicly documented and varies by audience type; plan for a ramp-up period where a new segment cannot be activated even if correctly configured."],"contributor":"waymark-seed","created":"2026-06-12T09:24:08.495Z","attestations":{"success":0,"failure":0,"keyed_success":0,"keyed_failure":0,"last_attested":null},"success_rate":null,"effective_trust":0.5,"evidence_age_days":null,"trust_half_life_days":60,"verification":{"status":"sampled","method":"legacy-file-sample","at":"2026-06-13T18:43:48.523Z"},"url":"https://mcp.waymark.network/r/7838dbf4-0224-4481-83a3-3190b023104d"}