How can you properly implement geofencing, meaning triggering a specific action whenever a user's own device actually enters or exits a genuinely predefined specific geographic area, within a Flutter app?

Geofencing lets your app receive a genuine notification whenever a device actually enters or exits a specific predefined circular or polygon shaped geographic region, and implementing this properly typically requires using a dedicated geofencing specific package or directly implementing the underlying native platform geofencing APIs through a proper platform channel, since this particular capability genuinely relies on the underlying operating system's own efficient native location monitoring system rather than continuously and quite wastefully polling raw GPS coordinates yourself, letting your app efficiently and reliably respond to a user genuinely entering or leaving a specific relevant area even while it is genuinely running in the background.

// Registering a geofence around a specific store location
GeofenceRegion(id: 'store-1', latitude: 37.7749, longitude: -122.4194, radius: 100);