Missing required attribute: which one, and the fix

What Google's message means

Every product on Google needs at least one image; these have no image link at all.

Google will not show the product anywhere until it has an image, so it earns nothing meanwhile.

The fix in Shopify

1. Products → the product → Media → upload the photo and drag it to the first position (the first image is the one Google uses). Save.
2. If Google names a different attribute in Merchant Center → Products → Needs attention: price is the variant's Price (above 0), title the product Title, description the Description, availability the variant's Inventory. Fill it and save.
3. To take a product off Google instead: Products → the product → Sales channels → untick Google & YouTube. Save.
4. Google re-checks the product at its next crawl (usually within a day); the next RevenueCue scan confirms it's clear.

The fix in WooCommerce

1. Products → the product → Product image (right-hand column) → Set product image → upload the photo. Update. The product image is the one Google uses; Product gallery images go as extra images.
2. If Google names a different attribute in Merchant Center → Products → Needs attention: price is Product data → General → Regular price (above 0), title the product name, description the long description, availability the Inventory → Stock status. Fill it and update.
3. To take a product off Google instead: Products → the product → Channel visibility (right-hand column) → Google: ‘Don't sync and show’. Update.
4. Google re-checks the product at its next crawl (usually within a day); the next RevenueCue scan confirms it's clear.

What it costs while it's down

Every product Google flags this way is out of Google Shopping — no ads, no free listing — until it's fixed. Its listed price is what isn't being shown; a free scan names each product and adds up the listed value at stake.