Shopify Custom Themes and Apps Product Identifier and Deduplication Audit

Inventory the identifiers you actually own

Record SKU, GTIN, MPN, brand, supplier identifier, parent product, child variant, and channel-specific IDs. Mark legitimate absence explicitly and never create a placeholder that looks real.

Platform defaults do not eliminate theme, app, Markets, bundle, subscription, or headless inconsistencies. Test the customer-visible storefront and every customized purchase state.

Find collisions and fragmentation

Search for duplicate SKUs, one GTIN assigned to multiple products, variants sharing a parent identifier incorrectly, and the same item split across imported records.

Compare every exposed surface

Check visible pages, structured data, feeds, internal APIs, exports, and checkout line items. Identity should survive the entire purchase path.

Create durable reconciliation rules

Document matching precedence, merge rules, retired identifiers, and exception handling. Add tests before the next supplier or catalog migration.

Primary references

• Schema.org Product identifiers
• Schema.org GTIN