For room messages, there are Hebhook events.
But I cannot see somthing similar for receiving a private message in the API.
Polling is no Option.
Do I have to use the XMPP-Gateway to receive private message events?
Is there something I missed?
Right now, webhooks are limited to room messages. In order to integrate with 1-1 chats, you would need something more along the lines of a bot. We hope to add more API support for 1-1 messages / integrations in the future, but we don't currently have a timeframe for when it will be added.
We don't have supporting documentation for connecting to the BOSH gateway, unfortunately. It might be possible to connect (we use https://likeabosh.hipchat.com/http-bind/ as the BOSH endpoint) but it's not currently designed for usage outside of the HipChat clients themselves.
...have mention name FirstnameLastname. Fe.: @MaartenCautreels This certainly helps to know who is being mentioned in a conversation. Imagine your colleague sends the following message...
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