You can use plus.activities.list, search the post provider field for reshare, then determine from content whether it was your original post.
Google+ API get link to reshared activities
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08-07-2023 - |
سؤال
Given a list of activity re-sharers how can I get the links to those individual shares:
There only seems to be a link to the users profile, not the actual re-share.
المحلول
لا تنتمي إلى StackOverflow