Adding feature to validate doamin

Thanks for the class.

Can you guide me to validate domain or website url with the serial number. So it will become 2 layer of validateion

1. license key
2. Domain

So what I want is to check if buyer is using the product on only one domain (site).

For example

I am having main class for plugin which is most for validation on my own server and call that class using cURL. So my main class will check whether request is coming from the domain register in your licence management product item.

Hope I have explained well.

I don't know but you could make licance key as crypet code includes licaned Domain linked to it .