The store (Cornucopia3D) is not the same as the e-on site. Those are separate entities, although they work hand in hand. It was a long time ago I did it, but as far as I remember, before you do your first purchase in the store, you have to register in the store itself. The store can retrieve your registration information from e-on site but you have to tell it explicitely. So, yes, there is a separate registration process in the store, sort of.