How can I secure my plugin so only paying users can use it?
I'm developing some (wordpress) plugins and I'm planning to have a license fee for whoever want's to use it.
Therefor I need a way to make sure that this plugin is not uploaded to a server where anyone can download it and use it for free.
So I was thinking of using an API key. Valid API key = user can use the plugin. Invalid = plugin does not work.
I also know that since it's PHP, anyone can go into the code and disable API check (I'm just guessing)
I have API System for generate license key
but not know php a lot
do you have here Developer
Please Share your example script