Another way to do this is to create a wordpress custom-post-type for Discourse topics that takes the Discourse forum base_url and topic_id and uses them to fetch the content for the post. The benefit of this is that it allows the Discourse content to be edited in WordPress, and it allows the content to be cached. The downside is that you have to enable CORS on the forum. Also, the content on wordpress is no longer synced live with the content on the forum. That could be a good or a bad thing, depending on what you are trying to accomplish.
https://github.com/scossar/wordpress-discourse-topic (this works but isn’t ready for a production site)