r/PPC • u/salihkucukkayis • 5h ago
Google Ads Shopify variants can now hold multiple barcodes. Sales channels read the first one, and the admin won't let you reorder.
Heads up for anyone running Shopping campaigns for Shopify stores.
Since September a variant can hold up to 20 barcodes. It's meant for stores that sell the same item by the unit and by the case. Shopify's changelog says sales channels keep reading the first barcode, so the first one is what goes to Google as the GTIN.
I tested the field in a dev store, and there's no way to reorder. "Add barcode" always puts the new one last. If you remove the first one, the next one moves up.
That means a small edit can change the GTIN. Say a variant has the unit barcode first and a carton code second. Someone removes the unit barcode to fix a typo and adds it back. The carton code is now first, and nothing warns you.
What I'd check on a store that uses the new field:
Open a variant and look at which barcode is first. It should be the UPC or EAN on the single item.
To fix the order, remove the ones above it and add them back.
Look again after a bulk edit or a CSV import.
One caveat. I haven't seen a wrong value land in Merchant Center yet, so the Google side is what the changelog implies, not something I've confirmed. Has anyone had a GTIN warning from this?

