I am developing a plugin that I want to add a registration section to the admin panel so users must register the plugin before use. So if someone installs the plugin onto their site they will need to put in a registration code before they can access some of the features. I have searched for a tutorial on this but have not had any success so far.
I am wondering if anyone who has done this before could point me in the right direction or if there is a tutorial I can look over to get some ideas from that would be great as well!
Thanks in advance!