Export products using API


I have hired a developer to develop a cs cart multi vendor site. I want to export products listed in my cs cart to other websites owned by my vendors and affiliates. The basic idea is that customers can also buy products from vendor and affiliate sites but the payment will be processed in cs cart. My developer says the API cannot be modified to export selected products to another website. He says we can import all the products but not vendor wise or by selection. Is this true? I have seen in amazon that you can select products and import it to your affiliate shop. Is such a facility available in cs cart?

Please help me out, Thanks in advance.