Chargeback thresholds explained: VAMP, MATCH and what closes MIDs

Most MIDs are not closed by an acquirer having second thoughts. They are closed because a card scheme monitoring programme flagged the account and the acquirer had no interest in defending it. The mechanism is public. Very few merchants understand it before it happens to them.

Who is actually watching

Not your acquirer. The card schemes monitor merchant-level performance directly and notify the acquirer when an account crosses a threshold. Your acquirer is then on the hook — for fines, for remediation reporting, and for explaining your account to the scheme. That is why an acquirer who liked you last quarter can become abrupt: the cost of keeping you has changed.

Visa consolidated its dispute and fraud monitoring into the Visa Acquirer Monitoring Program (VAMP), which assesses acquirer and merchant performance on a combined ratio. Mastercard runs its own excessive-chargeback programmes, and separately maintains MATCH — the Member Alert to Control High-risk Merchants list.

The ratio is a fraction, and merchants only ever look at the top

Dispute ratios are disputes over transactions in a period. Two things follow, and both are routinely missed.

First, the denominator is usually the previous month's transaction count, not the month the dispute landed in. A dispute filed in March against a February sale is measured against February's volume. If your volume is falling, your ratio rises even when disputes hold flat — which is exactly the situation a struggling merchant is in when they least need it.

Second, a sharp drop in volume is itself dangerous. Pausing spend after a bad month shrinks the denominator while the disputes from your good month are still arriving. Merchants regularly breach a threshold in the month they cut back to be careful.

MATCH is a different kind of problem

MATCH is not a fine. It is a list of merchants and principals that acquirers check before onboarding, and a listing typically stays for five years. It is added by the terminating acquirer, under a reason code — excessive chargebacks, fraud, laundering, violation of standards, and others.

The practical consequence is that a MATCH listing is not a Vertlo problem or a competitor problem. It follows the company and, depending on the reason code, the directors. Which is why the moment an acquirer starts talking about closing an account is the moment to ask, in writing, whether they intend to MATCH you and under what code — and to negotiate that specifically, separately from the closure itself.

• A listing can be contested if the reason code is wrong or the facts are disputed, but it is far easier to prevent than to remove.
• A voluntary, orderly wind-down of an account is sometimes agreed without a listing. That conversation only happens if you start it.
• If you are listed, disclose it in future applications. Acquirers check anyway, and a disclosed listing with an explanation is survivable in a way a discovered one is not.

What to do about it

1. 1.Get the number that applies to you, from your acquirer, in writing — the scheme threshold and their internal one.
2. 2.Measure the ratio the way the scheme does, against the correct denominator. A dashboard showing disputes against the current month flatters you.
3. 3.Deploy pre-dispute alerts. Resolving a complaint before it becomes a chargeback keeps it out of the ratio entirely.
4. 4.Fix the descriptor first. It is the cheapest intervention available and it removes the disputes that were never really disputes.
5. 5.Spread volume across MIDs before you are near a limit, so no single account carries enough traffic to breach.
6. 6.Watch the trend, not the month. A ratio climbing steadily is a problem you have weeks to fix; the month you breach, you have days.