Independent Sales Organization (ISO)
An organization registered with Visa and sponsored by an acquiring bank to sell VISA card acceptance services; also refers to an organization that works with and does business under the name of such a registered ISO. ISOs may also service merchant accounts once they are registered, dependent upon the contract with the acquirer. MasterCard uses the term "member service provider" to describe ISOs. However, it is common within the payments industry to use the term "ISO" when referring to independent sales organizations registered with either or both card brands.