I want to generate a unique token key to whoever downloads my plugin

Hi everyone,

I am building a plugin for WP. After a site owner purchases my plugin, they will be redirected to my WP site, where they will register their site with me. I want my WP site to generate a unique key for them. The site owner will then take that unique key and add it to the plugin via the admin panel in WP.

The user should be able to log into my WP site to retrieve their unique key at any time.

This is so people cannot share my plugin. Does anything like this exists? I’ve search but found nothing.

Please advise.

Thank you!