I am attempting to utilize the YouTube API in order to pull a list of my subscribers from the site. I had to get Credentials and create an API client. In researching this step, I was advised to choose 'Other' as the client ID option, but currently there is no option for other. You can see the options in this picture:
This question provides some context for mine: Where to download your_client_secret_File.json file
Google keeps changing the naming of it If your interested this is the progression of their naming.
either way pick desktop app for an app that will be running standalone on a machine some where and not running via a website or mobile device.