What an excellent detailed article! Thanks for sharing it!
BTW, with a manual flow, you can allow admin users to execute actions on behalf of users. The Bubble’s OAuth2 flow doesn’t provide this possibility.
Also, the Bubble’s OAuth2 sometimes has issues with token refreshing. Here, you can configure it as you need. For instance, if a token expires in 21600 seconds, schedule the refresh token workflow in 21540 seconds.
This method you can use for other platforms as well. For instance, the Bubble’s OAuth2 doesn’t refresh tokens.