To sell a product on eBay, you need a GTIN code
Most eBay product categories require a product identifier. Product identifiers, such as GS1's GTIN, are unique codes created by the manufacturer to identify a specific product. The type of product identifier used on eBay can vary depending on the category of the product.
The GS1 Global Trade Item Number (GTIN) gives products and their packaging a globally unique identity. If your product already has a GTIN, you should not create a new one to sell it on eBay. Use the existing code, which makes it easier to register your product on the marketplace.
Benefits of the GTIN
The biggest benefit of using a GTIN to identify your product is that it increases the buyer’s chances of finding it. Product identifiers allow buyers to find and compare available products while knowing that your product is exactly what they’re looking for. Using the correct product identifier also helps reduce the number of returns, as people can be sure of what they’re buying.
Using a GTIN also saves time when creating listings. When you enter a GTIN, eBay suggests a match if your product already exists in the eBay catalog. If a match exists, many fields, such as the image and title, are pre-filled.
The benefits of GS1 GTINs for eBay and their sellers
eBay talk about why GS1 GTIN is an important product identifier and the many benefits it brings to their sellers.