Finance teams should reconcile agent-negotiated media deals with a three-way match: the seller's invoice against independent delivery data, and both against the terms the agents agreed. The match only works if the agreed terms come from one deal record that buyer and seller both hold. When each side's agent keeps its own log, reconciliation starts with an argument about what was agreed before anyone gets to what was delivered or what is owed.

TL;DR. Agent-negotiated deals produce more deals, more varied terms and more mid-flight changes than a team working from insertion orders, and the agreed terms often live only in software logs. The reliable method is a three-way media match: agreed terms, delivery and invoice, each checked against the others. A single shared deal record removes the most expensive step, which is establishing what was agreed. Before the first agent-negotiated deal runs, finance should ask vendors where the agreed terms are stored, who can retrieve them, which delivery count governs billing and how amendments are recorded.

Why are agent-negotiated deals harder to reconcile?

Agent-negotiated deals are harder to reconcile because the paper trail finance relies on changes shape. A traditional direct deal produces a signed insertion order with a price, volume, flight and standard clauses. An agent-negotiated deal may never produce that document: its terms are agreed between a buyer agent and a seller agent, and each records the outcome in its own system.

Three things compound the problem. Volume rises, because agents can agree many small deals a trading team would never set up by hand. Terms vary more, because each deal can carry its own price, viewability commitment, delivery tolerance and makegood rule. And terms change mid-flight, because an agent can renegotiate when delivery runs ahead or behind. Together, they mean a month-end close can involve dozens of deals whose agreed terms finance has never seen.

What is the three-way media match?

The three-way media match adapts a procedure most finance teams already use for purchasing. In procurement, a three-way match checks the purchase order against the goods received note and the supplier invoice before payment is released. For media, the equivalents are the agreed deal terms, the delivery data and the seller's invoice.

Each pair tests something different. Agreed terms against delivery shows whether the seller delivered what it committed to: volume, flight, viewability and brand safety. Delivery against invoice shows whether the seller billed for what was delivered, counted as the deal specifies. Agreed terms against invoice shows whether the price billed is the price agreed, including any amendments. A discrepancy in any pair is an exception for a person to review, not something an agent should resolve on its own authority.

Why does a single shared deal record matter?

A single shared deal record matters because the three-way match assumes one set of agreed terms. When each side's agent logs its own version, finance holds two candidate "purchase orders", which may differ on price after an amendment, on which count governs, or on what a missed viewability commitment triggers.

In the Agree. Transact. Verify. simulation, buyer and seller records kept separately disagreed in 95.3% of 90,202 simulated deals, against 0.19% when both sides worked from one shared record. Live rates will differ, but the direction holds: separate records turn reconciliation into a negotiation about history.

A shared record is useful to finance only if it has four properties. It is written at the moment of agreement, not reconstructed later. It is timestamped, so amendments appear as new versions rather than overwrites. Both parties hold it. And either party can retrieve it without asking the other.

Which delivery numbers should finance trust?

Finance should trust the delivery count the deal terms name, and the terms should name one. Ad servers, sell-side platforms and verification tools count impressions at different points, so some discrepancy is normal. The question is which count governs billing and how large a gap is tolerated before the governing count switches or a dispute opens.

Viewability needs the same treatment. If a deal carries a viewability commitment, the terms should state the measurement standard, such as the MRC viewable impression guidelines of 2014, and the vendor whose number applies. Without a named measure, each side will produce a figure that suits it.

What should finance teams ask vendors before agents start negotiating?

These questions belong in procurement, before the first deal runs:

Where are the agreed terms for each deal stored, and does the counterparty hold the same record?
Can finance retrieve the agreed terms directly, without going through the trading team or the vendor?
How are mid-flight amendments recorded: as new timestamped versions, or by overwriting the original?
Which delivery count governs billing, and what discrepancy tolerance applies?
How is a missed viewability or delivery commitment settled: credit, makegood or price adjustment?
Does each invoice line reference a deal identifier that matches the agreed record?
Which approvals did a person give, and where are they recorded?

A vendor that cannot answer the first two is asking finance to reconcile against its logs alone.

What does a month-end reconciliation look like in practice?

The following is a hypothetical, illustrative example, not real campaign data. An advertiser's buying agent agreed three deals in one month, and the seller invoiced £38,200 in total.

Deal A was agreed at 2,000,000 impressions at an £8 CPM. Both counts showed 2,000,000 delivered and the seller invoiced £16,000. All three pairs match.

Deal B was agreed at 1,500,000 impressions at a £10 CPM, with a 60% viewability commitment. The terms said the seller's count governs within a 5% tolerance, the buyer's count governs beyond it, and a missed viewability commitment triggers a makegood the following month. The seller invoiced £15,000 for 1,500,000 impressions. The buyer's ad server counted 1,410,000, a 6% gap, so the buyer's count governs and the payable amount is £14,100. Measured viewability was 52%, below the commitment, so a makegood is logged as an open item.

Deal C was agreed at a £9 CPM, then amended on day 10 to £7.50 when delivery ran behind. Of 800,000 delivered impressions, 300,000 ran before the amendment and 500,000 after, so the payable amount is £2,700 plus £3,750, or £6,450. The seller invoiced £7,200, the full volume at the original price, because its billing system read the first version of the terms.

The reconciled payable is £36,550, against £38,200 invoiced: a £1,650 difference and one open makegood. With a shared, versioned deal record, the Deal C amendment is a fact both sides can retrieve. Without one, it is a dispute.

Who should sign off agent-negotiated spend at month end?

People. An agent can prepare the match, flag exceptions and draft adjustments, but releasing payment, accepting a credit or agreeing a makegood are commitments the organisation remains accountable for.

Alkimi, a neutral agentic advertising marketplace working within IAB Tech Lab's AAMP framework, is built to supply the record this process depends on: each DealSheet is written at agreement, timestamped, held by both parties and retrievable by either side independently, and people keep approval rights at the deal level.

Frequently asked questions

What is a three-way match for media deals?

A check of the agreed deal terms against delivery data and the seller's invoice. It adapts the procurement match of purchase order, goods received note and invoice, with each pair testing a different failure.

Why can finance not just use the buying agent's logs?

Because the seller's agent keeps its own logs, and the two can differ. Reconciling against one side's record invites a dispute over what was agreed.

How should mid-flight amendments be handled?

As new, timestamped versions of the agreed terms, so finance can apply each price to the impressions delivered while it was in force. An amendment that overwrites the original cannot be audited.

Can an AI agent approve its own reconciliation?

It can prepare the match and flag exceptions, but payment, credits and makegoods are commitments the organisation is accountable for, so a person should approve them.

How Should Finance Teams Reconcile Agent-Negotiated Media Deals?