Error 5005 — Merchant ID mismatch

The Merchant Identifier in your feed doesn't match the Seller Central account you're submitting from. Authentication fails.

Multi-account setups where the wrong merchant_id was hardcoded in the feed's MessageHeader, or testing credentials leaked into a production feed.

1. Verify your Merchant Identifier in Seller Central → Settings → Account Info.
2. Update the merchant_id in the feed's MessageHeader to match exactly.
3. If your tooling caches credentials, refresh them.
4. Resubmit.

• Stale merchant IDs after migrating from sandbox to production