and the example code does not seem to work to add something to the cart. For instance, if I press this link: http://www.shapeways.com/addToCart?model_id[]=302496
(which is linked to in the tutorial) nothing is added to my cart. I've tried plugging in different model_ids as well.
I tried updating the link and Id's in the form following the tutorial but it didn't work. I emailed customer service and was told they were working on updating it.