How to Fix FCM Registration Token Errors
Diagnose FCM registration token failures systematically: identify the error class, refresh tokens safely, check project configuration, and remove stale registrations without disrupting delivery.
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Practical push notification guides, product updates and lessons from building better customer experiences.
Why Push Notifications Work in Development but Not Production
Push notifications that work locally can fail after release because production changes credentials, app identity, tokens, permissions, targeting and delivery conditions. Use this practical checklist to find the break.
Why Notifications Disappear When the App Is Closed
Notifications can appear while an app is open but vanish after it is closed. Learn how operating systems, permissions, payloads, tokens, and delivery logic affect closed-app notifications.