When shipping to a non-US address with USPS, you may encounter this error.
Error 1101313 -Invalid/missing value for Customs.CustomsItems.hSTariffCode
This happens if the Harmonized Code is not added for each item on the Customs Declaration form or if the Harmonized Code is less than 6 digits.
Please see this USPS article for updated customs rules. To learn how to add a Harmonized code to your products in Ordoro, see this support article.