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Glossary

ISO (Independent Sales Organization)

By Jessica VelascoJune 20, 2025December 16th, 2025No Comments

DEFINITION

Independent Sales Organization (ISO)

Glossary  /  Independent Sales Organization (ISO)

An Independent Sales Organization (ISO) is a third-party company authorized to resell merchant services on behalf of an acquiring bank. ISOs help businesses set up payment processing and may offer additional services like fraud tools, billing software, or chargeback support. They must be registered with card networks and comply with financial regulations.

AltoPay is a registered ISO with Visa and Mastercard, and we are sponsored by several acquiring banks. As a full-liability ISO, we have our own portfolios at each of our sponsor banks. AltoPay is responsible for compliance, pre-underwriting, onboarding, technical infrastructure, support, and risk management, and we have various departments to manage each of these responsibilities.

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Jessica Velasco

For more than a decade, Jessica Velasco has been a thought leader in the payments industry. She aims to provide readers with valuable, easy-to-understand resources.

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