technical expert at automating data feeds between websites

I have a wordpress website – [login to view URL] I operate a dropshipping business, using [login to view URL] as my supplier. I want to automate my site with the supplier site so that: a. my site is automatically up to date with the latest products and prices; and b. that orders made on my website are automatically sent to the supplier Initially, sextoyclub told me that I could not do this from a wordpress site since wordpress was not built to sell t16,000 to 18,000+ products online. They said that I instead needed to use one of Zen Cart; osCommerce; Open Cart or PrestaShop as these carts are compatible with their software. They wrote the following to me: “The WP API makes it nearly impossible. If you have a VPS or Dedicated hosting PrestaShop is a good choice, so you can optimize Prestashop, The other three will work on most any shared hosting service. Note: Godaddy hosting is not recommended, due to their overloading and resource reduction. More information about the STCtoCart, STCtoOC and STCtoPresta can be found at: [login to view URL]” However, once I told him that I only wanted to sell 500-600 products, he said that this could be done.. So I would like to do this, provided it does not slow down my website. Can you do this for me? Thanks Eitan