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Slipmill

Documents, not labels

Shipping document API

Slipmill prints packing slips and invoices. It does not buy postage, book a pickup, or fill EasyPost forms.

Get a Slipmill keyRead the schema

“Shipping documents” here means the paper that goes in or on the box: a packing slip for the buyer, an invoice if you bill that way. It does not mean a carrier label, a commercial invoice for customs, or a rate shop.

If you already use ShipStation or EasyPost for labels, keep them. Call Slipmill when you need a branded slip from your own order JSON.

Two templates. JSON in. PDF out. That is the whole shipping-document surface.