Firebase Push Notification Topic Subscription

This is an ionic 3 package.

So I have this in my package.json

"@ionic-native/push": "3.4.4"

I then import it into my app.component:

import { Push, PushObject, PushOptions } from '@ionic-native/push';

and finally create an object:

const pushObject:PushObject = this.push.init(options);

Here is the link.