Fix guide

How to fix missing GTIN on Shopify (Google Merchant Center)

If Merchant Center shows missing/incorrect GTIN or “insufficient product identifiers,” your listings can be disapproved — or worse, stay “Active” in Shopify while Google quietly limits impressions.

What Google wants

1. Valid GTIN (UPC/EAN/ISBN) in the variant barcode field, or
2. Brand + MPN together, or
3. identifier_exists = false for handmade, custom, vintage, or truly unique goods

Manual fix in Shopify

• Products → variant → Barcode: paste a real GTIN (validate check digit).
• Organization → Vendor: real brand (not “N/A” / “Generic”).
• Metafield google.mpn: manufacturer part number (SKU often works).
• Metafield google.identifier_exists: false when no identifier exists.
• Re-sync Google & YouTube channel; wait 24–72h; check GMC Needs attention.

Faster: audit the whole catalog

ShelfCheck scans every product for invalid barcodes, missing brand/MPN, apparel gaps, and channel publish misses — then exports a supplemental feed. Run the free demo scan.

Related: insufficient product identifiers, products not syncing to GMC.