Is it possible to sell a product through an web application without a user having to login with Shapeways? I see mixeelabs and it looks like you can generate your figurines without registering with Shapeways, so I guess it is possible. However. looking at the API example it seems that the ordering needs to be handled via Shapeways (with the user having to authenticate). Is my understanding correct? if not, what would be the best way to proceed on the back end? ie use my user account? Thanks for any pointers.