singletonschreiber.com

1. An offermissing on 25 of 25

   Give each product an offer: without one there is no price, currency or stock for a cart to read.

2. Pricemissing on 25 of 25

   State the price as a number, such as 68.00, never text with a symbol in it.

3. Currencymissing on 25 of 25

   State the currency as a three-letter code, such as USD.

4. In stock or notmissing on 25 of 25

   State stock as a schema.org value, such as https://schema.org/InStock, for each variant.

5. Brandmissing on 25 of 25

   Name the brand, so the product can be matched across stores.

6. Product identifiermissing on 25 of 25

   Give each product its barcode (GTIN), or at least its SKU, from the product itself.

7. Descriptionmissing on 25 of 25

   Give each product the description its page shows.

8. Conditionmissing on 25 of 25

   Say each product is new, or how it is used or refurbished.

9. Shippingmissing on 25 of 25

   State what delivery costs, where it goes and how long it takes, once for the store or on each offer.

10. Returnsmissing on 25 of 25

    State the return policy: the window, the countries and who pays, once for the store.

A count of fields says what a page's data states, read before any script runs. It does not decide eligibility: Merchant Center and Google's own review decide whether a product shows in merchant listings, Universal Cart or any other Google feature.