Managing Logins through Photoshop Plugin

Hi,

I am developing a Photoshop Plugin which allows users to login to their account created on an external website.

The website uses a max login system depending on the users subscription. For example free members can only have one login session, while paid users can have more.

I'm having trouble managing these logins as logging in through the plugin doesn't only count as a login session seperate from the browser (for example the same user could be logged in from their browser and the plugin and exceed their max amount),

but I am also finding issues in logging out, as whenever the user closes the plugin the login session is not automatically ended.

Any advice on how this problem could be overcome?

Thanks!