I'm building an App Maker app that uses the Google OAuth2 library (https://github.com/googlesamples/apps-script-oauth2) to connect to an external service.
All is working fine until it comes to setting a callback URL. I've implemented the same type of project for a Google Sheets addon, but using apps script there I can get the script URL, but I can't seem to access that with App Maker, making it tricky to register the callback URL in the API I'm accessing.
Has anyone found a solution to this?
Thanks,
Paul