You cannot cancel or stop a notification once you send it. When you trigger a send command, the system passes the notification content and device IDs to the delivery services immediately. Apple Push Notification service (APNs) handles iOS devices, while Firebase Cloud Messaging (FCM) handles Android.
These external services manage the delivery process from that point on. No mechanism exists to pull back or delete a message after it reaches these gateways. If a device is offline when the notification goes out, the delivery service stores the message and tries to send it again when the device reconnects, based on its own internal logic.
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