Duplicati and Google Drive paths

This is the URL we need to use to authorise Duplicati full access.

https://duplicati-oauth-handler.appspot.com/?

@kenkendk
Because i am transferring my backup from another cloud to google drive, i need this because manual copying is not working for duplicati to backup and restore. I have a question that giving access to duplicati is that we are giving access to any third party application or storage or it will remain to my duplicati login only. How safe is this?