This app will only work for you if you no longer want to sell on eBay and just import all your listings to Shopify. So you don't have to do double work. This app was only helpful for that matter. Not helpful for me as I still sell on eBay. First time I sync my listings to Shopify it work. I added new listings to my eBay, sync a second time instead of only syncing the new listings it imported all of my listings again. Making duplicate listings in my Shopify store. Not fun to delete the duplicates at all. I'm already a member with inkfrog. So, the only way to do this is create your new listing with Shopify. Then you go to your inkfrog account (make sure your Shopify store and eBay store is linked with them. Also edit some setting too.) import your new Shopify listing. Edit your listing if needed. Finally it will be ready to import to your eBay live.
Hope this helps! Meanwhile visit my Shopify store www.carolinaoutfitz.com