2020-01-02, 12:02
- Go to the API console - https://console.developers.google.com/apis/library
- Scroll down and click on YouTube Data API v3
- Click the blue manage button near the top
- Click credentials on the left hand side menu
On that credentials screen you should have two entries, one for API keys and one for OAuth 2.0 Client IDs. If you've set this up previously there should be an entry under each.
- The API key should be visible under key and can be copied to the clipboard with the little double-page icon just to the right of it.
- For the ID and secret, click on the link under name in the OAuth 2.0 Client IDs entry. That should bring up a screen showing the client ID and client secret.
Those three (API key, client ID and client secret) are the three items you need to enter to use your own API keys.