Missing GTIN, brand, or MPN weakens Shopping ads.

Google Merchant Center often needs an identifier (GTIN/EAN/UPC, brand, or MPN) plus a large enough image and shipping weight. Products without that data do not advertise cleanly. ShopGaps does not build a feed and does not log into Merchant Center.

Store Audit — $149 Pro checks on-site — $49/year

Pro (shop zip 1.0.3) lists missing GTIN, brand, MPN, featured images under 500×500, and missing weight or dimensions. Variable parents are skipped where those fields live on variations. We do not invent barcodes.

What to do

1. Run Catalog Audit Pro on the store, or send WooCommerce → Products → Export for a written Store Audit.
2. Fill GTIN/brand from your own supplier sheet. Do not guess barcodes.
3. Replace tiny featured images. Merchant Center expects at least 500×500 px.

Sample (fictional shop): audit-sample.html.

Related gaps

Duplicate SKU · Missing weight / dimensions · Missing variations · Catalog Audit plugin