YouTube Analytics API
Generates custom reports containing YouTube Analytics data for channels and content owners. Reports can be filtered by dimensions such as date, country, and video, and measured by metrics including views, likes, and watch time.
Documentation
Documentation
https://developers.google.com/youtube/analytics
GettingStarted
https://developers.google.com/youtube/reporting/guides/authorization
APIReference
https://developers.google.com/youtube/analytics/reference
Authentication
https://developers.google.com/youtube/reporting/guides/authorization