Glossary: Order rules
Purchase order (PO)
A purchase order (PO) is a document a business buyer issues to authorize a purchase. It lists the products, quantities and agreed prices, and carries a PO number that appears on the invoice. Many B2B buyers need a PO number to match invoices to their own records.
Example
A buyer's accounts team asks for PO 10458 to appear on the invoice so it can be matched and paid.
Learn more
Read the Order rules and terms hub for guides, use cases and setup docs, or the complete Shopify B2B guide.