Integrations on HipChat Cloud need to be able to access the host providing the integration in order to provide webhooks for slash commands. Unfortunately, that means the host cannot be behind a firewall / on an internal server.
In the tutorial for building an addon via node.js, you can see an example of using a service like ngrok to provide public access to an internal server. It's possible a similar setup would work for your case, although you would probably want a more robust setup for a long-running production setup.
...from the beginning. We have built up a lot of content in HipChat, with it being a core tool in our distributed company model. While it is true that we didn’t need to move to Slack immediately, we felt it...
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