GUID(request)

[3xigames]

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?

[EnIgMa1234]

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

[3xigames]

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.

[Dismounted]

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