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Google Firebase Cloud Messaging (FCM)
FCM is not a geofencing tool itself, but it is the critical *delivery mechanism* for geofencing alerts. Once a backend service (like AWS or Firebase Functions) detects a boundary crossing, it uses FCM...
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Apple Push Notification Service (APNS)
APNS is Apple's proprietary service for delivering push notifications to iOS devices. Like FCM, it is a delivery mechanism, not a geofencing engine. While it is the required standard for iOS alerts, d...
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