NetObjects Fusion v10

I have a small ecommerce site to send photos in zipped file format to purchasers - I dont need to know their postal address details (which seems compulsory in many store engines).
I have set up the catalogue/prices , gallery etc but am having difficulty in 'adding to cart/view cart/checkout and payments.
Netfusion Objects gives a choice of several store engines and I tried MALs engine but cannot configure the URLs to achieve what I want basically to create checkout/take payment and email me what has been ordered. Either get this to work or maybe integrate PayPal for payment (does this also take credit cards???)
It's not a big job for someone who knows what they are doing with this - and I'd prefer to keep my own website design (that I can refine) rather than a purchased 'templated' one.
When completed I would also like to understand how it has been achieved.