To map shopify products with eBay items, please navigate to App Sidebar Menu → Shopify Products. Then shopify products table shown as below.  In the action column in the table there are buttons like “ Map with Ebay Item ”, “ Suggest Ebay Item ” and “List on eBay”.    

• Map with Ebay item: If you have the same product on both shopify and ebay, and to map these items click this button.    
• Suggest Ebay Item: If you have similar shopify item on ebay, and to map these items click this button.    
• List on eBay: If you want to list shopify product which is not on ebay, and to list this product on eBay click this button.