Hello, I was wondering if anyone could please point me in the right direction. I have spent some time looking for answers on the web and not found exactly what I need.

in a nutshell:
I want my program to be registered once a user enters a serial number of some sort along with their email address. I have an app for my phone and that is what I had to do to get the full version of it.

Any sort of help would be grateful. Thanks