How to get google app API Key to integrate with Thunkable Apps

I am trying to create an app that shows the users apps in a list. I found this link:

https://developers.google.com/drive/api/v2/reference/apps/list?authuser=1

but I cannot find the API key. If someone could help it would be appreciated.

This may help you

https://developers.google.com/drive/api/v3/enable-drive-api

But how do I make this link a project because it says i need to make it a project before I get the key
https://developers.google.com/drive/api/v2/reference/apps/list?authuser=1

I appreciate you help so much

https://developers.google.com/drive/api/v3/quickstart/js?authuser=1