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Hi,

Disclaimer: I am the CTO of GetStream.io

Implementing what you describe is fairly simple indeed. First of all sign up on getstream.io and go to the dashboard. You will have an app with 4 different kind of feeds already configured.

• Install the javascript client (github.com/getstream/stream-js)
• Add the client to your project and configure it with the API keys you find on GetStream Dashboard
• When an activity needs to trigger a notification (eg. it contains a mention to a user) make sure that you use the to field. eg ({'actor': 'user:tom', 'verb': 'comment', 'object': 'nice work @john', to: ['notification:john']})
• Subscribe for notification updates, see this example
• When you want to set the notification feed as read or seen (and reset the counters to 0) just perform an API get and send the markseen/markread parameters

We built a very simple example app with NodeJS and Mongoose, here you can find the interesting bits about the realtime UI code and here is how the main html page looks like.

I hope this helps, if not feel free to ping me at tommaso@getstream.io ;)

Best, Tommaso