A missing or mismatched PO number is the most common reason a B2B invoice bounces silently inside a customer's AP system. Confirm the PO at the start of the engagement, put it on every invoice, and re-confirm when it renews or the amount changes.
Glossary
Purchase order
Also: PO · PO number
A purchase order is the customer's document authorizing a purchase, and its number is what the customer's accounts payable system uses to match and approve your invoice.
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