For books please use the ISBN-10 as ASIN. You can find it in the “Product details” section on the product page, or if you are using ASA2, the ISBN-10 is automatically used by the product picker.
For books please use the ISBN-10 as ASIN. You can find it in the “Product details” section on the product page, or if you are using ASA2, the ISBN-10 is automatically used by the product picker.