We have an ebay and an amazon site which is managed by Sixbit ([url removed, login to view]). Sixbit currently has integration for ebay and amazon, so when a product sells on ebay the inventory is automatically reduced on Amazon and vice versa. We are looking for a way to add an ecommerce channel such as EKM or shopify. The main issue is making sure if an item sells on our ecommerce site the ebay and amazon listings either have a quantity available reduced or the listing ended. Sixbit have an API ([url removed, login to view]) that can be used. Any suggestions?