With the launch of the Google Analytics Data API v1, users now have the ability to export user IDs and device IDs of the audience they have created in Google Analytics 4. Previously, this information could only be sent to direct integrations such as Google Ads or Firebase, or via the BigQuery User Export feature. The availability of the Google Analytics Audience Export API in alpha extends to both standard and 360 properties, with higher limits for 360 properties. Further details can be found in the developer documentation.
Looking to start using GA4?