Dear Sir,
We have already workied on number of shopping websites, designed and developed number of processes to register users, what they will be buying.
We can develop this simple application for you in just a day. Which will retrieve their licence from .Net.
Please feel free to ask anything that comes in mind, we are here to help you out.
If you can discuss this more on skype, that will be great, please share your ID so that we can have more direct and fast communication.
Many thanks
Shah