Access Collabora editor with external apps

I have a setup with Nextcloud and Collabora; works very well!
Now, I have an external php application that can read the file list inside a folder (I can access to it with WebDav). My goal is to create a link that can open the Collabora editor of the file directly, such as I click it inside Nextcloud window.
In collabora administration section, I have generated a custom token, but I don’t know how to use it.