The goal is to receive a push notification from Google when an external user changes the content of the drive that has been shared with him by a G-Suite (or Google Workspace) account member. I've already tried the following:
- Watch every user of the G-Suite account with "support all drive" flag setted on true (see Changes: watch):
In this way the notifications are sent only if the change is triggered by any of the G-Suite users. - Watch the Shared Drive itself using "Files: wath" API:
In this way the subscription simply fails (see https://issuetracker.google.com/issues/130736018).