Bigcommerce developer for xml feed price comparison site

Hello, I have an eshop in bigcommerce and I need to connect it with the price comparison site in Greece: [login to view URL] For the [login to view URL] I will need the xml which you can see an example in the file ''example xml for bestprice''. This xml should be refreshed every time I have new products in my site. please let me know for anything more you may need.