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I just implemented this in our production app last month and it's actually much simpler than most tutorials make it seem. Use Expo's notification API (expo-notifications) to handle the client-side registration and displaying notifications. Then set up a serverless function in Supabase Edge Functions that triggers on database changes. The key part everyone misses is storing the Expo push tokens in a dedicated Supabase table linked to your user accounts. Our implementation took about 2 days and has been rock solid.