Advice and answers from the Realtime Team

Using the Account Management website

Navigate to your Realtime subscriptions list, select the application key panel title and click "Push Notifications" as shown below.

You'll get a list of all channels subscribed with push notifications. Clicking a channel will show the actual devices subscribing it.
 

Using the Realtime Push API

You can also use the ListTopics endpoint of the Realtime Push API.

Here's an usage example with the curl command:

curl -X POST -d '{ "applicationKey": "YOUR_REALTIME_APPKEY", "privateKey": "YOUR_REALTIME_PRIVATEKEY" }' "https://ortc-mobilepush.realtime.co/mp/listtopics/"

More API details at http://messaging-public.realtime.co/documentation/starting-guide/mobilepush.html#api

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