Curl bash script for getting a Google Oauth2 Access token

GoogleAuthenticationCurl.sh

# Tutorial https://www.daimto.com/how-to-get-a-google-access-token-with-curl/
# YouTube video https://youtu.be/hBC_tVJIx5w
# Client id from Google Developer console
# Client Secret from Google Developer console
# Scope this is a space seprated list of the scopes of access you are requesting.

# Authorization link.  Place this in a browser and copy the code that is returned after you accept the scopes.
https://accounts.google.com/o/oauth2/auth?client_id=[Application Client Id]&redirect_uri=http://127.0.0.1&scope=[Scopes]&response_type=code

# Exchange Authorization code for an access token and a refresh token.

curl \
--request POST \
--data "code=[Authentcation code from authorization link]&client_id=[Application Client Id]&client_secret=[Application Client Secret]&redirect_uri=http://127.0.0.1&grant_type=authorization_code" \
https://accounts.google.com/o/oauth2/token

# Exchange a refresh token for a new access token.
curl \
--request POST \
--data 'client_id=[Application Client Id]&client_secret=[Application Client Secret]&refresh_token=[Refresh token granted by second step]&grant_type=refresh_token' \
https://accounts.google.com/o/oauth2/token

Found a good link, Goog OAUth2 Playground helped generate the refresh token with correct scope, etc. Doc here, link is in the doc:
https://developers.google.com/google-ads/api/docs/oauth/playground

For https://developers.google.com/oauthplayground/