Authorization in a multisite application?

Question

Ruby on Rails

Good afternoon!
There is a RoR application. It holds the n-th number of sites. Login to rails_admin is done through a separate domain, there is no access to the admin from other domains.
I would like, if a person logged into the admin panel, that the session would be distributed to all sites, to display the page controls.
How to make it so that after logging in to the admin panel, the session/cookie will be sent to all sites within this application?
PS domains are different for all sites

Answer 1

maybe it will be useful doorkeeper
example https://www.youtube.com/watch?v=zN9BylV81rw