Hi Jonathan! Oberlo only integrates directly with Shopify, but you can still use your existing site to sell Oberlo products. You'll need to use the Shopify Lite (https://bit.ly/20IwEIn) plan which allows you to embed Buy Buttons on your existing store. The Buy Buttons direct your website visitors to a Shopify checkout and then redirect them back to your site after checkout. This will give you access to the Shopify Admin and the Oberlo Marketplace. Hope that helps!