'How to save user preferences without logging user in flutter app

I am working on a flutter app that requires some user data to be saved on server side. But I don't want user to log in using username/password or any social account.

Is there a way in flutter to identify the user/device without explicit login ?

There seems to be a anonymous login using Firebase but I am looking for a generic solution without any specific backend. I am using Django as my backend.

djangoflutterauthentication


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