you are probably after hipchat api here: https://www.hipchat.com/docs/apiv2.
If you haven't done yet you can also find general information about writing a HipChat add-on on this Confluence space. Read the getting started section first, then the section Building an add-on and then the sub-section: Handling the add-on installation flow.
...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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