A practical guide to debugging push notifications in React Native using Expo, APNs, and Firebase Cloud Messaging. Covers the full notification delivery pipeline: requesting permissions, managing push tokens (including token rotation), understanding Expo's queuing and receipt system, and using the Quick Push tool to test notifications directly against Expo, Apple, and Google without modifying your server. Also demonstrates debugging common errors like invalid tokens, wrong bundle IDs, and misconfigured credentials, plus testing iOS Live Activities updates.
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