A 3-way match is a verification process used in financial systems to ensure accuracy in invoice processing. It involves comparing three documents: the purchase order, the receiving report (goods receipt), and the vendor's invoice. The purchase order details the goods or services ordered, the receiving report confirms the receipt of those goods or services, and the vendor's invoice provides the billing information.

The quantities and amounts on the receiving report and the vendor's invoice are compared against the purchase order. If all three documents align and match, the invoice is considered valid for payment. The 3-way match helps prevent errors, fraud, and discrepancies in financial transactions.