As previously announced, the new endpoint in the Google Calendar API that allows administrators to programmatically transfer the ownership of secondary calendars is now being rolled out. Its functionality mirrors the data transfer feature currently available in the Admin console by permitting transfers between users in the same organization without sending emails or requiring confirmation from the recipient. Beyond replicating the Admin console functionality, the API provides greater flexibility by allowing administrators to transfer specific, individual secondary calendars.

To help organizations prepare for the upcoming secondary calendar data lifecycle changes, where secondary calendars will follow the lifecycle of their owner, administrators can now programmatically monitor the ownership status of their users' secondary calendars.

A new filtering option will be available in the CalendarList:list API method that restricts results to return only secondary calendars owned by the organization. When combined with the users.list method of the Admin SDK API, administrators can retrieve a comprehensive list of organization-owned secondary calendars across their users' calendar lists. The dataOwner field can then be used to verify current ownership status and make any necessary adjustments.

Source: Google Workspace Updates