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Firebase Cloud Messaging Guide

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Core Concepts: FCM enables cross-platform messaging for push notifications
Push notifications are real-time messages displayed on user devices
Two types exist: notification messages and data messages
Maximum message payload is 4000 bytes
Technical Implementation: FCM relies on message composition, backend, and transport layers
Messages can be sent to single devices, groups, or topics
Supports priority, TTL, and throttling for delivery control
Works with Android, iOS, and web platforms
Integration Process: Mobile apps register with FCM and obtain unique tokens
Web apps use Web Push Protocol instead of direct FCM integration
Notification workflows manage message delivery across channels
Multiple channels recommended for better user engagement
Limitations: Push notifications require user opt-in
Device dependency limits message delivery
Single channel reliance can be risky for critical notifications
Channel preferences vary by user engagement level