Complete 2026 Guide: Setting Up Flutter Push Notifications with Firebase FCM

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A detailed technical walkthrough explains how to implement push notifications in Flutter apps using Firebase Cloud Messaging (FCM), covering foreground, background, and terminated app states. The guide highlights three key 2026 requirements: Android 13 runtime permission, the FCM HTTP v1 API, and a background message handler that many tutorials omit. Developers are advised to use three specific packages — firebase_core, firebase_messaging, and flutter_local_notifications — since FCM does not display foreground notifications by default without the third package. Platform-specific setup steps are outlined for both Android and iOS, including uploading an APNs key to Firebase, identified as the most common reason notifications fail silently on iPhones. The article aims to resolve a widespread developer pain point where notifications appear in the foreground but disappear in background or terminated states.

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