Definition of 3-Way Matching in Accounts Payable System: 3-way matching is an accounts payable process that helps procurement professionals verify the accuracy and completeness of every purchase. In this process, all three documents associated with a purchase — the purchase order, the invoice and the receipt — are compared against each other to ensure everything matches up. By comparing them side by side, 3-way matching can help accountants quickly reconcile invoices and make sure purchases are paid correctly and on time. So why not take a few minutes out of your day and join us in doing the three-way match? It’s your best bet for streamlined invoicing and increased security!