| Merchant Center affected-products CSV | Offer ID, issue title, attribute name, severity, current GTIN, MPN, brand, and identifier_exists value. | Google may be flagging the transformed feed row, not the Shopify source row. | Match each affected offer ID to the Shopify variant ID or feed app row before editing identifiers. |
| Shopify product or variant export | Variant barcode, SKU, vendor or brand, product title, variant title, and last product edit time. | SKU-as-MPN, duplicate barcodes, or blank brand fields can create false confidence in a bulk repair. | Separate rows that need manufacturer GTIN from rows that need MPN plus brand or identifier_exists=false review. |
| Feed app or Merchant Center rule screenshot | Field mapping, supplemental feed ownership, content API source, last fetch time, and rule priority. | A rule override can keep sending the wrong value even after Shopify product data is fixed. | Decide whether the fix owner is Shopify data, feed app mapping, supplemental feed, or a Merchant Center rule. |
| Public product page evidence | Visible brand, model, barcode/MPN if shown, price, availability, return/shipping proof, and product URL. | Identifier repair can still fail if public product facts and Merchant Center data tell different stories. | Attach representative product URLs to the reviewed snapshot when trust, policy, or feed evidence overlaps. |