push-notification-setup

# Push Notification Setup Implement push notifications across mobile and web platforms. ## Firebase Cloud Messaging (React Native) ```javascript import messaging from '@react-native-firebase/messaging'; // Request permission async function requestPermission() { const status = await messaging().requestPermission(); if (status === messaging.AuthorizationStatus.AUTHORIZED) { const token = await messaging().getToken(); await sendTokenToServer(token); } } // Handle foreground messages messaging().onMessage(async message => { console.log('Foreground message:', message); showLocalNotification(message); }); // Handle background/quit messages messaging().setBackgroundMessageHandler(async message => { console.log('Background message:', message); }); // Handle token refresh messaging().onTokenRefresh(token => { sendTokenToServer(token); }); ``` ## iOS Native (Swift) ```swift import UserNotifications func requestAuthorization() { UNUserNotificationCenter.current().requestAuthorization(options: [.alert, .badge, .sound]) { granted, error in if granted { DispatchQueue.main.async { UIApplication.shared.registerForRemoteNotifications() } } } } func application(_ application: UIApplication, didRegisterForRemoteNotificationsWithDeviceToken deviceToken: Data) { let token = deviceToken.map { String(format: "%02.2hhx", $0) }.joined() sendTokenToServer(token) } ``` ## Android (Kotlin) ```kotli...