Two-way vs three-way vs four-way matching
The number in the name counts the documents being compared. Two-way matching checks the invoice against the purchase order. Three-way matching adds the goods receipt. Four-way matching adds an inspection or acceptance record on top. Each added document tightens the control and adds a step that can stall the invoice.
Picking between them is a risk decision, and it should be made per category rather than once for the whole company.
Every added document buys control and costs speed
Each document is an independent witness. The purchase order proves the terms, the receipt proves delivery, the inspection proves the goods were usable. The more witnesses the match requires, the harder it is for a bad invoice to clear, and the more ways a good invoice can get stuck waiting on paperwork that has nothing wrong with it.
Two-way matching trades control for speed
Two-way matching pays any invoice that agrees with its purchase order, with no proof of delivery required. That fits spend where a receipt is meaningless or wasteful: subscriptions, utilities, retainers, low-value indirect purchases. The trade is real, because the company is trusting the supplier on whether anything arrived. Two-way matching on physical goods is how companies end up paying for shipments that never landed.
Three-way matching is the right default for goods
For physical goods, the receipt is cheap evidence and the risk it removes is exactly the risk that matters: paying for more than arrived. That makes three-way matching the standard control for direct materials and most inventory. It is also where most exceptions are born, because receipts arrive late and deliveries arrive in parts, so the choice comes with a resolution workload attached.
Four-way matching earns its cost only in regulated buys
Four-way matching holds payment until goods pass inspection. In pharmaceuticals, aerospace, food, and other regulated or safety-critical categories, that gate is worth every stalled invoice. Everywhere else it mostly adds a fourth document that can go missing. Reserve it for the categories where accepting a defective delivery costs far more than the invoice.
Match the control to the risk, category by category
The practical setup is a mix: two-way for services and utilities, three-way for goods, four-way where regulators or physics demand it. Then expect exceptions in proportion to the control, and staff the resolution accordingly. The stricter the match, the more the queue depends on how flagged invoices get resolved, because a control that only creates work for people is a control the business will quietly route around.
Fragment resolves the flags any of these matches raise by reading the order, the receipt, and the surrounding context autonomously. See how Fragment reads that context or request a demo.