77 votes30 comments · Product Feedback & Fresh Ideas » Selling Channels, Carriers & Other Connections · Flag idea as inappropriate… · Admin →
Thank you for submitting this request and helping us to improve ShipStation! We need to determine if this is possible through the carrier API. We do not actually generate any of the Commercial Invoices or Customs Forms. We send the shipment information to the carrier, then they generate the form in realtime and send it back to ShipStation so you can easily manage/print it. We will let you know once we have an update.
Thanks again for your request,
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this is an absolute must. not just for usps orders though.