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1. Go to https://developers.google.com/oauthplayground/

2. Under Select & authorize APIs > Select the following scopes

   1. https://www.googleapis.com/auth/yt-analytics-monetary.readonly

   2. https://www.googleapis.com/auth/yt-analytics.readonly

   3. https://www.googleapis.com/auth/youtube.readonly

3. Click on Authorize APIs.

   

4. Choose your google account.

5. Allow the request.

6. You will be redirect back and on Step 2 > click on Exchange authorization code for tokens button

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7. A Refresh Token will be generated.