Google Analytics Data API
The Google Analytics Data API v1 provides programmatic methods to access report data in Google Analytics 4 (GA4) properties.
Documentation
Documentation
https://developers.google.com/analytics/devguides/reporting/data/v1
Authentication
https://developers.google.com/analytics/devguides/reporting/data/v1/basics#authentication
Quickstart
https://developers.google.com/analytics/devguides/reporting/data/v1/quickstart-client-libraries