Where can I enter a GTIN, EAN or MPN for my product?

Unique product identifiers are individual codes given to products. They are split into two types, either the GTIN (Global Trade Item Number) or MPN (Manufacturer Part Number). EAN is a type of GTIN that's in use in Europe.

If you submit your products to Google Shopping (or similar aggregators), then you'll need to have entered a GTIN or MPN for your product (unless the product has an exemption).

When creating/editing a product, the GTIN and MPN can be entered in the 'Additional Information' section:

Enter the values in these fields and then save your changes.