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Glossary

ISO

PaymentsUpdated 2026-08-23
The short answer

An ISO is an independent sales organization, a registered third party that sells acquiring services on behalf of an acquiring bank and places merchants with it.

For a restricted category, the ISO is usually the party that actually knows which banks will underwrite what, which is why the relationship is worth more than a rate quote.

What a good ISO does for a restricted merchant

How to evaluate one

Ask how many acquiring relationships they hold and whether any currently underwrite your exact category. Ask what happens to your account if that bank exits. An ISO with one relationship and a confident manner is a single point of failure wearing a suit.

On referral fees ISOs and referral partners are compensated, usually as a share of processing revenue. That is ordinary and disclosed. What matters is whether the compensation is steering you toward a bank that fits, or toward the only one they have.

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