Google has introduced version 1.5 of the Data Manager API, expanding its capabilities for user list and audience management.
This update brings a new UserListService, allowing advertisers to fully control the creation, retrieval, updating, and deletion of user lists within the API. It streamlines the management of audience lifecycles directly through Data Manager.

The release also includes a PartnerLinkService, enabling secure management of links between advertiser and data partner accounts across Google Ads and Display & Video 360. In addition, audience ingestion now supports User IDs, which can be used for Customer Match, and there is improved status reporting for monitoring User ID uploads.
These changes are designed to make audience workflows more efficient while providing better diagnostics and partnership options.
Read the official announcement here: Announcing user list management and enhanced audience ingestion for the Data Manager API.