- Channel app plus manual tag. Both fire, purchases double.
- Feed app sending supplier titles with no override mapping configured.
- Identifiers not mapped, so GTIN and brand never reach Merchant Center.
- Currency converter rewriting prices client-side, creating a feed-to-page mismatch.
- Discount apps changing displayed price without updating the feed.
- Post-purchase upsell revenue not passed, so your highest-value orders look ordinary.
Each takes minutes to check and can be worth a substantial share of the account. More on Shopify setups.