Customize a WordPress Store to Integrate with an Existing Flash File

Users of the site will use pre-existing flash file to customize products (magnets). The flash file will output http references to a few image files. These images must be displayed/stored. The user should then be able to purchase the product that they have customized. The image references should be visible somewhere in the admin panel when viewing the order. The cart and the flash file are already built, but you must customize the cart to be able to accept the input from the flash file.