Trouble connecting with Jira Cloud and self managed install


Hello all

I am maintaining a self-managed version of gitlab, I am attempting to allow Jira to interact with the platform. I am using this plugin.

However after the initial process of the OAuth login to gitlab I believe I am missing the installed hook back to to my gitlab install. (its mentioned here in this deep dive of how the eco system works)

What is the uri of this hook?
Who sends it? (I will need to whitelist the sender)
At the moment I think this is being blocked by our admins.