Buying Start8 For Customers

Hi guys.

I do a lot of work for customers and am getting a lot of requests from them to make Windows 8/8.1 easier for them to use.

Of course, the simple answer is to use Start8 and even ModernMix.

But my only problem is finding a way to register these apps in my customer's names without having to go into their emails to retrieve the codes.

Is there a simple way to do this?

Thanks...