ShipStation can print the customs documentation you need for a USPS international shipment as part of the shipping label itself.
Basically, you'll see two types of integrated customs labels:
- A single-part label (a.k.a. "single ply")
- A three-part label (1 - Proof of Payment, 2 - Customs Declaration, 3 - Dispatch Note)
The single-part label is easy to use-- it's like any other shipping label!
Please note that ShipStation doesn't control which international shipments get the single-part labels and which get the three-part labels. The USPS postage providers decide that based on USPS requirements (e.g. declared value and destination country), which are subject to change. For example, the USPS recently decided that shipments to Australia, Canada, Costa Rica, and US Military destinations no longer require three-part labels (See Appendix D of this USPS document.)
The three-part label requires you to put the labels, in order, inside a USPS-provided window pocket. These window pockets are free and can be ordered from your local postal office or from the USPS website here.
For more information on processing international shipments with ShipStation, see our FAQ on the subject here.