To use the Disqus plugin in your Gitbook project, add the disqus plugin to the book.json file, along with your shortname (you create a shortname for disqus by creating a new website on the disqus.com website)

{
    "plugins": ["disqus"],
    "pluginsConfig": {
        "disqus": {
            "shortName": "XXXXXXX"
        }
    }
}

Using the YAML frontmatter, you can disable the Disqus comments thread for a specific page:

---
disqus: false
---

# My Page without disqus

By default Disqus use the window URL as the main identifier when creating a thread. You can set a custom identifier in the YAML frontmatter of your page:

---
disqus:
  identifier: "some-identifier"
---