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There is two sides of the setup, one in iHub Cloud and one in Google Console
Google Console
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Goto Google Console
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Create a project
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Reference create a service account https://cloud.google.com/iam/docs/service-accounts-create
Create and Goto Google Console
Create a project
Goto API & Services
Click Credentials
Click Create Credentials
Create a Service Account
Click on the Service User
Click Keys, create new
Download the Private Key as JSON
Enable the API that you want to access. example Google Sheets
For Google Docs, Sheets, Presentation etc share the resource with the service account to grant access
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Now when ever you create an issue it will trigger the integration, which will create the JWT token and exchange it to a access token. The access token is then used in the child action to perform the append of a row with issue data.
References
https://developers.google.com/identity/protocols/oauth2/service-account#httprest
https://cloud.google.com/endpoints/docs/openapi/troubleshoot-jwt