I am trying to find a solution for 2 months now but unfortunately I came up with no results. I have a subscription based website which streams music. What customers basically buy is a "panel" where they are listening to music without the need to refresh the page. What I need is to disallow their account being logged in if it is already in use. I found many plugins that force the user to log out but this happens only if they refresh the page. It could also work if for example: A logs in. B logs in with the same account and at this time A is being automatically logged out (I guess with the use of Ajax). It's a bit weird that nobody needed this in the past. Anyone could help?
Thanks in advance.