Payment Gateway

Also called gateway, payment gateway service, online payment gateway

The software layer that connects your website, invoice or virtual terminal to a processor. Cheap on the statement, expensive to leave.

What it is

A payment gateway is the software that takes card data from wherever you collect it — a website checkout, an invoice link, a virtual terminal, an app — encrypts it, and routes it to a processor for authorization. It's the plumbing between your business systems and the payment networks. For card-present retail, the terminal often performs this role directly. For anything online, invoiced, keyed or recurring, you need a gateway. Modern gateways do far more than routing. A full-featured gateway includes a customer vault for stored cards, network tokens, an automatic account updater, recurring billing, electronic invoicing, hosted checkout pages and links, text-to-pay, fraud screening, Level 2 and Level 3 data for B2B interchange optimization, and transaction routing across multiple merchant accounts. NMI's gateway, for example, connects to 150+ processors and 125+ shopping carts and ships all of the above. The independent gateway market consolidated hard. USAePay was absorbed into NMI. Payrix became Worldpay for Platforms under Global Payments. Cardknox became Sola, a registered ISO of Citizens Bank and Elavon. The remaining genuinely independent options for a small merchant are a short list — NMI, Authorize.net (owned by Visa), Sola and Fortis among them.

Why it matters to your business

Your gateway determines whether you can switch processors easily. A gateway tied to a single processor means changing acquirers requires rebuilding your checkout. A processor-agnostic gateway means changing acquirers is a configuration change. That's the difference between having leverage and not. It also determines whether you're paying twice. Before you buy any subscription billing, invoicing or fraud tool, check whether your gateway already includes it. This is the single most common duplicate expense we find on small business statements.

Where it gets contested

The gateway is the least expensive and most powerful lock-in in payments. It usually costs $10–$30 a month plus $0.05–$0.13 per transaction, which merchants barely notice — and it's the single hardest thing to remove, because pulling it means re-integrating a website, an invoicing system or an ERP. Processors know this. Some legacy processors have been documented charging token export fees and imposing non-solicit clauses that make leaving genuinely expensive. The second issue is duplicate spend. Merchants routinely pay a separate vendor for subscription billing, invoicing or fraud screening that their gateway already includes. A business paying Recurly $249/month plus 0.9% for recurring billing may already have recurring billing, network tokens and an account updater sitting unused inside a $19 gateway subscription. The defense of gateway pricing is legitimate: gateways carry PCI scope, maintain hundreds of integrations, absorb card-testing attacks and provide the tokenization that keeps card data out of your systems. That's real infrastructure, not a rent. The complaint isn't the price. It's that most merchants have never been told what they're already paying for.

How to check it yourself

Ask your provider for a written list of every feature included in your current gateway subscription, then compare it against every payments-adjacent SaaS tool you pay for separately. Also ask: if I move processors, does my gateway move, and is there a token export fee?

Receipts

Claims above that are checkable, with where to check them. Published so you do not have to take anyone's word for it.

A full-featured gateway includes 150+ processor connections, 125+ carts, customer vault, network tokens, recurring billing, electronic invoicing, Level III data, virtual terminal, text-to-pay, P2PE and automatic card updater
nmi.com ↗
Gateway consolidation in 2026: usaepay.com redirects to nmi.com, payrix.com redirects to platforms.worldpay.com, and cardknox.com redirects to solapayments.com — now a registered ISO of Citizens Bank N.A. and Elavon
solapayments.com ↗
Legacy processors can trap platforms with token export fees and non-solicit clauses
rainforestpay.com ↗
Recurly's Starter plan is $249/month plus 0.9% of billing volume, versus recurring billing included in a standard gateway subscription
recurly.com ↗