Dynamic price in WUSPSC

Hi,
I have set up a 3d printing business, and now a new website.

the client up-loads their STL cad file, and it generates a price($prit) via a php script.

I want to know how I can use the WUSPSC plugin to pick up the price($prit) which the STL.php genetaes.

I have looked at the WUSPSC.php, and “included” the STL.php file.

I just can’t get it to “see” the price.

I note that the add to cart button is lmited and gives me wp_cart:PRODUCT-NAME:price:PRODUCT-PRICE:end] as an option for add to cart.

any help would be much appreciated

David