This API part enables you to export identifiers included in the audience segment.
The API makes it possible to get GAID, advertistnigId, CustomUserID, and other identifiers that can later be used for advertising targeting and be load to a third-party analytics system.
You will get CSV files compressed to gzip. Large files can be split into multiple pieces. Each file has a title with the names of requested identifiers. You can exclude the title if needed.