Log in to your Google Account and go to this website:
https://console.developers.google.com/
Create a new project using the dropdown at the top.
After you enter a name, it takes a few seconds before the project is successfully created on the server.
Make sure you have the project selected at the top.
Then go to Library and click on "Drive API" under "G Suite APIs".
And then Enable it.
Go to "Credentials" and click on the tab "OAuth Consent Screen". Fill in a "Product name shown to users" and Save it. Don't worry about the other fields.
Then go back to Credentials, click the button that says "Create Credentials" and select "OAuth Client ID".
Choose "Web Application" and give it a name.
Add https://developers.google.com/oauthplayground in "Authorized redirect URIs". You will need to use this in the next step to get your refresh token. Once you have the token, you can remove the URI.
Click Create and take note of your Client ID and Client Secret.