Common errors document: https://developers.google.com/google-ads/api/docs/best-practices/common-errors#authorizationerror
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We are trying to build dashboard for our internal team to check all running campaing analytics in single dashboard, to achive it we were exploring google Ads API to fetch campaing, ad-group, ad stats data.
I am using google-ad python lib. I have shared code to get campaing and ad-group data.