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Discussion on: How to add Anonymous Authentication to your Next.js App using Supabase

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Anjan Shomodder

Well, converting an anonymous user to a permanent user doesn't change the user object or the ID. So, if you store cart information and have a reference to the user ID, then you should be good to go.

But if you want to link an anonymous user to an existing permanent account, then you have to handle data conflicts manually. Supabase docs have a good example for that.

https://supabase.com/docs/guides/auth/auth-anonymous?queryGroups=language&language=js#resolving-identity-conflicts

Hope it helps!