An independent sales organization, or ISO, is a third-party company that partners with an acquiring bank to sell and manage merchant accounts. That’s the independent sales organization definition in its simplest form: an ISO connects your business to the banking system so you can accept card payments, without you going directly to the bank yourself. Evolve Payment is an ISO, which is part of why we think this distinction is worth explaining clearly.
So what is an independent sales organization doing in your payment setup at all? It comes down to specialization. Acquiring banks handle the heavy infrastructure of moving money. ISOs handle the parts you actually touch.
Who Does What in Your Payment Setup
Three parties are usually involved, and each has a different job:
- The ISO sells you the merchant account, sets your rates, and supports you afterward. It does not hold your money.
- The acquiring bank holds the account and carries the risk behind it.
- The payment processor routes and authorizes each transaction.
The bank rarely changes. The ISO is who answers the phone. That distinction matters most when something goes wrong and you need to know who to call.
It also explains why two sales reps can describe the same setup in completely different terms. One calls their company a processor, another calls theirs an ISO, and you are left wondering which is better. Often the label is not the real difference. What the company actually does for your business is.
How ISO Payment Processing Works
ISO payment processing follows the same basic structure across the industry. The ISO signs the merchant, opens the account, and stays the main point of contact. The bank and processor work behind the scenes.
Where ISOs really differ is what happens after setup.
Standard Setup vs. Custom Fit
Some ISOs hand you a standard package and step back, sort of fading into practical non-existence. Others treat ISO credit card processing as an ongoing partnership. The gap usually shows up in a few places:
- Whether they connect to the software you already run, or ask you to switch
- Whether your rates get reviewed over time, or set once and forgotten
- Whether support knows your account, or reads from a script
- Whether unusual requests get solved, or get declined
That last point is worth weighing carefully. Plenty of businesses run on gateways or platforms outside the mainstream, and the answer they get is often to switch to something the provider already supports. An ISO willing to build around your existing setup is doing meaningfully different work than one selling off a shelf, even though both are technically offering ISO payments.
What Is an ISV (Independent Software Vendor)?
An ISV, or independent software vendor, is a company that builds software with payment processing built into it. Instead of signing up for a separate merchant account, you pay through a platform you already use, like a point-of-sale system or an ERP.
ISV credit card processing runs inside that software. You tap a button in the system you already know, and the payment moves without a separate login or provider to manage. An isv payment processor is the infrastructure partner working behind that software, since building payment processing from scratch is not most software companies’ core business.
ISO vs. ISV: What’s the Difference?
The ISO-ISV distinction comes down to what each company sells:
- An ISO sells access to a merchant account, plus the support around it
- An ISV sells software, with payments built in as one feature
Neither model wins outright. An ISV fits when payments belong inside a platform your business already depends on. An ISO fits when you want a partner focused specifically on payments, with the flexibility to work across whatever software you run.
Understand the Difference Before You Sign Up
These categories used to be cleaner. Today, more ISOs build deep software integrations, and more software companies are embedding payments directly into their platforms. The result is a lot of overlap, and a lot of confusing sales language.
In practice, the label matters less than the question underneath it: does this provider fit how your business actually works, or are you being fit into their template?
That is the question worth asking before you sign anything, no matter which term ends up on the paperwork. If you are weighing options and want a clear read on how your current setup compares, reach out and we will walk through it with you.