Zoho and e-marketing

Hi there!!! OK here's my dilema. I'm want to be able to sell "packs" in the form of grouped documents such as PDF documents to clients on my website. This will be in the form of a shopping trolley where clients can purchase using online payment such as PayPal. My question is this. Is there any way of linking Zoho database so the client can view the database of "packs" and then make a purchase, this is turn automatically filling a field stating "sold".