Fulfillment tracking_company code

Hi @SBD please could you tell me how you did this? We’re sending “DHL_EXPRESS” in the trackingCompany field, which is not in the list above, and the carrier in the order on Shopify is being set to “Poste Italiane”, which is also not in the list. How can we convey the correct trackingCompany to Shopify so our customers can click on a correct tracking URL? Thanks,