Not mentioned in the documentation but I noticed this works
Are you supporting handles or not? If so, how do you find out which to support?
Thank you for contacting Altmetric!
Our API does support handle calls. This is because we support handles in our Altmetric badges. You should be able to continue using the handle API call but this is only for handle.com IDs and not all handles.
Our documentation does not currently contain reference to this feature, though we will be updating.
The issue has been closed as implemented - can you point me to the documentation? Thank you