What this is: A way for a bot to let your discord server know a post has been made. What this is not: A way to integrate discord into your forums as a chat feature. If you were looking for a way to make discord a chat box like I was, this ain't it.
I ran into issues trying to get this to work on 2.2.13 and my ThemeHouse skin. I'm not sure if it was a server/host issue or whether Discord has changed. The author tried to assist best he could remotely however wasn't something that could be resolved remotely. We essentially now only use it to "Post as bot" to the discord server and have linked to the server via other methods.
Awesome addon and crucial to my gaming community. It took me a bit to get this working for my large discord server, and unfortunately the seller wasn't much help. But I figured it out and it's been very useful.
Update: The add-on now works properly but the author, Jaxel, took over a month to respond to my posts in the support thread, resulting in major downtime for this add-on on my forum.