When importing shipments via CSV, you must use the following format in the "postage_type" field:

usps_express*

usps_express_mail_international*

usps_first

usps_first_class_mail_international

usps_first_class_package_international_service

usps_media_mail*

usps_priority

usps_priority_mail_international

chit_chats_canada_tracked*

chit_chats_us_tracked

chit_chats_international_tracked

chit_chats_slim

chit_chats_select

chit_chats_us_edge

chit_chats_us_select

chit_chats_us_slim

unknown


If no postage type is defined:

  •  the postage will display as "unknown". The unknown postage type may be used together with the field cheapest_postage_type_requested to automatically select the cheapest postage rate for U.S. shipments.

Based on your shipment settings, if the postage type is defined but rates are not available: 

  • the import will fail with 'unable to fetch postage rate' errors
  • the shipment will be imported as an “unknown” postage type. After the import, you can update any affected shipments and proceed to purchase postage. For reasons why a postage rate may be unavailable, please see our support article “Why can’t I buy postage?


*Service availability may vary