Oh cool. I've done a lot of similar projects in recent years with Apps Script [1]. With a script that's tied to a document (or even a standalone script that ref

Oh cool. I've done a lot of similar projects in recent years with Apps Script [1]. With a script that's tied to a document (or even a standalone script that references Docs by ID), you can design your own API of sorts. Take in HTTP GET and PUT [2], run commands with DocumentApp [3], etc. The upside to a system like that is, the authorization flow is abstracted completely out and handled by Google. You just pick from a dropdown as far as who you want to have access to the Web App URL, and you don't have to deal at all with setting up an OAuth flow. 1. https://developers.google.com/apps-script/ https://developers.google.com/apps-script/ 2. https://developers.google.com/apps-script/guides/web https://developers.google.com/apps-script/guides/web 3. https://developers.google.com/apps-script/guides/docs https://developers.google.com/apps-script/guides/docs