Could I build a 'store' into a Unity game, and send transaction data across the net to a server based e-commerce application that can then process the transaction?

The server application does not need to be "Unity", but I need to know if an interface like that is possible. I've done this with flash and a pearl script before, but I don't know if Unity has anything like a "post variables" command that lets you send data from inside a Unity game, across the net to a server based application. I really need to know if I can do this before I start using Unity. I've asked technical, but I get no answer!

Thanks, Tim