As you know there is a nearest API update for YouTube Analytics for version two and I just wanted to try it. There is a constructor of your request like a: https://developers.google.com/apis-explorer/#p/youtubeAnalytics/v2/youtubeAnalytics.reports.query
so when you fill up some fields and click on authorize and execute you will see a special formed link like a https://youtubeanalytics.googleapis.com/v2/reports?dimensions=insightTrafficSourceType%2Cday&endDate=2018-09-19&ids=.........&key={YOUR_API_KEY}. So I can't understand which API key I need to use. Can you help me and provide a correct instruction and link to information about my issue?
Thanks and have a nice day