GUID(request)
 

I would like to generate a GUID every time a user pays for premier status on my website.
This GUID will be user specific allow them to use my product.
How can this be done?

If your using the subscription system, it generates a unique transaction ID.

I need it to lock into the account so I can make them have to log into my program.

I also don't know how I would have it contact the server.

I have a C++ project that somehow needs to contact the server and make sure they paid to use it.
WinLicense.. kinda does this.. but its all manual.

Create a PHP script that checks the ID (from GET/POST parameter). Call this script inside your program (make sure you flood check).