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HTTP 409: Change not revertable. Retrying the same request gives the same error. Errors never cost API credits. What to do: This change cannot be undone: reason says why (legacy_app_write, before_from_cache, delete, publish_fee, shipment_notified_buyer, images, quantity, reactivates_listing, not_landed, outcome_unknown, …). Nothing was written. For outcome_unknown, read the change again once its outcome is known (it may have landed); otherwise make the edit you want with update.
Response
The response is application/problem+json (RFC 9457) and has a Request-Id header with the same request_id. See all errors.