android - Subscribe to Topics in FCM for Chrome

Question

I am working on sending push notifications with FCM.

I am able to send notifications successfully to a set of devices when I know their IDs.

But now, I want to send notifications to a topic as mentioned here: https://firebase.google.com/docs/cloud-messaging/topic-messaging

They have documented the server side pretty well. But I am not sure how to subscribe to a topic on the client side (My client includes chrome packaged app, web browsers, ionic based mobile application for different platforms.)

So, in summary how do I make users subscribe to topics?

Please help me out. Thanks in advance.

PS: I did go through How to get registered into GCM topics from javascript (for Chrome) and How to implement Google Cloud Messaging - Topic Messaging in Chrome? but it did not help much.

Answer 1

Waitting for answers