What a gateway does
A payment gateway is the software layer that securely captures card details at checkout, whether from a website, app or virtual terminal, and encrypts them before passing them along. Think of it as the digital equivalent of the card reader on a countertop terminal.
What a processor does
The processor takes the encrypted transaction from the gateway and routes it through the card networks to the issuing bank for approval, then moves the actual funds toward your merchant account once approved.
Why in-person doesn't usually separate the two
In a typical retail or restaurant setup, the terminal itself effectively handles both roles seamlessly, which is why most in-person merchants never think about gateways at all — the distinction only becomes visible with online or phone-based selling.
Where the split becomes visible
Online stores, invoicing platforms and virtual terminals typically need a distinct gateway integration, which is sometimes bundled with your processor and sometimes a separate product entirely with its own monthly fee.
- Bundled: one provider, one bill, simpler setup
- Separate: potentially more flexibility, but two relationships to manage
- Gateway fees are usually a flat monthly cost plus a small per-transaction fee
- Some platforms include the gateway at no extra charge for their own checkout
Common confusion points
Because both sit 'in the middle' of a transaction, they get blurred in casual conversation and even in some marketing materials. When comparing online payment setups, it's worth explicitly asking whether gateway fees are included or billed separately.
How this affects total cost
A separate gateway fee, even a small one, adds up across every online transaction and every month, similar to any other recurring line item. It's worth including in your effective rate calculation the same way you would a monthly service fee.
Choosing an integrated setup
For most small businesses, a single provider that bundles gateway and processing into one bill and one dashboard is simpler to manage and reconcile than juggling two separate vendors and two separate statements.
What to ask before signing up for online payments
Whether the gateway is included or extra, what the per-transaction gateway fee is, and whether it supports the specific checkout experience you want (like saved cards or subscriptions) are the key questions to settle upfront.