YouTube APIs - Access mutiple youtube channels (Brand Accounts) using Google Admin account

Question

I need to extract information from videos using YouTube Analytics and Reporting Api.

I have access to multiple YouTube Brand Accounts, when I log into YouTube with

Answer 1

The YouTube API is different then other google APIs. With other APIs you authenticate access to the full account. However with the YouTube API its channel based. You are going to need to authenticate your application once for each channel.

onBehalfOfContentOwner

This parameter is intended for YouTube content partners that own and manage many different YouTube channels. It allows content owners to authenticate once and get access to all their video and channel data, without having to provide authentication credentials for each individual channel. The actual CMS account that the user authenticates with needs to be linked to the specified YouTube content owner.

You need to be a YouTube partner then you can contact your account manager and get a CMS id. I have yet to figure out what magic one must archive to become a YouTube partner.