Geofence

import { Geofence } from '@ionic-native/geofence/ngx';

...

constructor(private geofence: Geofence) {
  // initialize the plugin
  geofence.initialize().then(
    // resolved promise does not return a value
    () => console.log('Geofence Plugin Ready'),
    (err) => console.log(err)
  )
}

...

private addGeofence() {
  //options describing geofence
  let fence = {
    id: '69ca1b88-6fbe-4e80-a4d4-ff4d3748acdb', //any unique ID
    latitude:       37.285951, //center of geofence radius
    longitude:      -121.936650,
    radius:         100, //radius to edge of geofence in meters
    transitionType: 3, //see 'Transition Types' below
    notification: { //notification settings
        id:             1, //any unique ID
        title:          'You crossed a fence', //notification title
        text:           'You just arrived to Gliwice city center.', //notification body
        openAppOnClick: true //open app when notification is tapped
    }
  }

  this.geofence.addOrUpdate(fence).then(
     () => console.log('Geofence added'),
     (err) => console.log('Geofence failed to add')
   );
}