What changed
On October 22, 2026 Google launched Display & Video 360 API v5 in public beta. The version separates inventory-source deals from auction packages, changes resource IDs and targeting types, refactors audience targeting on Demand Gen and YouTube ad groups, and removes firstPartyAndPartnerAudiences methods used to create or edit Customer Match audiences. It also adds advertiser-level YouTube video/channel exclusion management and Digital Out of Home insertion-order support. Google's public documentation warns that breaking changes can still occur during beta; v4 remains the latest general-availability API.
Why it matters
This is an integration migration, not just a new set of features. Code that reuses cached inventory-source IDs, sends v4 audience-group assignments to Demand Gen/YouTube ad groups, or writes Customer Match members through DV360 v5 will need changes. Agencies and SaaS tools managing many advertisers should run dual-version tests and avoid treating the public beta as a forced v4 sunset.
Inventory IDs and targeting are not portable
In v4, InventorySource resources represent both deals and auction packages, targeted under TARGETING_TYPE_INVENTORY_SOURCE. In v5, inventory deals use advertiser/partner inventorySources and TARGETING_TYPE_INVENTORY_SOURCE_DEAL; auction packages use targetingTypes.targetingOptions and TARGETING_TYPE_AUCTION_PACKAGE. Google explicitly says previously cached InventorySource IDs cannot be reused after migration. Reconcile IDs and targeting records rather than merely changing /v4/ to /v5/.
Demand Gen and YouTube audiences are refactored
For Demand Gen and YouTube ad groups, v5 replaces the single TARGETING_TYPE_AUDIENCE_GROUP assignment with distinct assigned targeting options for combined audiences, custom lists, first-party/partner audiences, Google audiences and lookalikes. Line items continue using TARGETING_TYPE_AUDIENCE_GROUP, so a generic targeting adapter must branch by resource type. Customer Match creation and membership editing move out of DV360 v5 to the Data Manager API.
New capabilities come with compatibility work
V5 adds write access to advertiser-level YouTube video/channel exclusions, Digital Out of Home insertion-order handling, lookalike audience resources and fields for generated ad creatives. Integrations may also need to replace Adloox/Scope3 references with Peer39, update YouTube related-video fields and handle synthetic-media flags. Review the exhaustive official release notes before changing production clients.
Public beta is not a mandatory cutover
Google calls v5 an open beta and warns its schema can change during beta. Its published release notes still identify v4 as the latest generally available API. Upgrade client libraries and test payloads against v5 in a non-production integration before rolling out; monitor release notes for beta breaking changes and the eventual v4 sunset policy.