Create a source in DSP to import first-party audiences to your DSP account or an advertiser account.
For additional steps required to ingest segments from specific customer data platforms, see the audience-specific activation workflows
In the main menu, click Audiences > Sources.
Click Add Source.
In the Select a Type menu, select the source type.
Specify the Data Visibility Level: Advertiser or Account.
Enter the remaining source settings.
Keep a copy of the Source Key that is generated. You’ll need the value later.