Google & YouTube

Hi! For products that are not custom-made, you can add either a GTIN or your MPN right in the Shopify product UI. These need to be valid GTINs, which are often 12 or 14 digits. Right now it looks like you're sending 8 digit values that don't have a valid lookup and/or are failing the check digit logic. You may want to validate that these are accurate GTINs since they're being rejected by Google as being invalid. You could use MPN as your identifier instead if you're certain you do use GTIN-8 values.

To add a GTIN to your products, you'll want to go to Products > select the product (or bulk edit products) > enter in your GTIN within the "Barcode (ISBN, UPC, GTIN, etc.)" field

If you don't have a GTIN, but have an MPN instead, you can Bulk Edit by going to the Google & YouTube App > Overview > Bulk Edit Variants and filling the "Google:MPN" field. On an individual product, simple scroll down on the product page and you'll see "Google: MPN" in the Metafields section.

Additionally, we are standing by to assist you with support agents if you just click "Get Support" in the upper right of every page in the app or visit https://support.google.com/merchants/contact/shopify_3p_support_app

Hopefully this helped explain the issue and you can revisit this review once you've read through these instructions!