what type of google credentials needed for this library?

[vetsinen]

what type of google credentials needed for this library?

[glass-ships]

+1 for this, documentation isn't clear. some kind of secrets.json i guess?

[bronygamedev]

A client id and a client secret.
to obtain these keys you need to make a project in google developer console.
add the "YouTube Data API v3" library than add an OAuth 2.0 Client and download the Json file then rename it to client_secrets.json