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What is a shipment reference?
A shipment reference is an identifier which you define by completing the "reference" fields during the shipping process. This reference could be a purchase order (PO) number, a customer number, a company name, a Bill of Lading number or a phrase which identifies that shipment -- such as "10 crates" or "gift for Mom." Shipment references can be any combination of letters and numbers up to 35 characters.

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