To publish Shopify products to eBay, select Listings in the navigation menu on the left, then select Ready to Publish towards the top of the page.
Next, select the products you would like to publish to eBay, then choose Publish to eBay.
After selecting Publish to eBay, you're presented with a bulk edit page.
In the bulk edit page, you may add and remove fields, and bulk update eBay categories or policies. You may also change your title, pricing, quantity, weight, eBay attributes, and barcode prior to publishing or leave the information as is. To finalize and list to eBay, select Save & Publish.
Once your products successfully publish to eBay, they're located in the Published Products tab. Each listing will have an eBay item number below the title, this number is a link that will open the listing directly on eBay.
To continue publishing listings, select Ready to Publish.