I have a Google Spreadsheet file and a JavaScript application, hosted using Google Firebase free plan – if that changes anything. I would like to grant my application a read/write permission to the file so that when a user, posts something using my app, it will be written to the SpreadSheet as a new line. I thought that should be a simple scenario but…
While I got the read part running, using the API_KEY, the writing part seems to require OAuth authentication - even if the file itself is 100% public…
In my scenario the application itself should be the one, authenticating to the Sheet API - not the user of that application.
So, is there any way around this? Or to somehow log-in using OAuth on the application level?
Please note: I know I could use Firebase here, but let’s just assume that for now, it is not an option.