This article applies to selling in: United Kingdom

Error 18008

Invalid MerchantOrderID. For help on how to proceed, see http://sellercentral.amazon.co.uk/gp/help/30681

This error occurs when we are unable to recognise the MerchantOrderID you provided. The MerchantOrderID must exactly match a value you previously provided in an order acknowledgement feed. Common reasons why this error may occur include:

  • You accidentally provided the AmazonOrderID instead of your own MerchantOrderID.
  • You transposed or omitted characters in your MerchantOrderID.
  • Your MerchantOrderID was never created in the Amazon system because of an error in a previous order acknowledgement feed.
To resolve this error:
  1. Review the MerchantOrderID field. If the AmazonOrderID is in that field, provide a valid MerchantOrderID. If the field has a typo, correct this.
  2. Update your acknowledgement feed with the corrected MerchantOrderID and resubmit your data.
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