How to call a function when app is closed in ionic

Question

I need help, I do not know how to make a function call in the background when the application is closed, it only works if it is open or minimized.

platform.ready().then(() => { 
  this.backgroundMode.setDefaults({ silent: true });
  this.backgroundMode.enable();
  backgroundMode.on('enable').subscribe(() => { 
    setInterval(() => {
      this.getBusqueda();
    }, 5000);
  });