What Is a Payment Gateway and Do You Actually Need One?
When you start accepting card payments online or through software, you'll quickly encounter the terms "payment gateway," "processor," and "merchant account" — often used interchangeably when they're actually different things. Understanding what each one does helps you avoid paying for services you don't need and ensure the ones you do have are set up correctly.
PCI Consulting Group offers merchant services for small and mid-size businesses — payment processing setup, statement analysis, and rate optimization.
The three pieces of a card payment
The payment gateway
The gateway is the software layer that securely captures card data from your customer and transmits it to the payment processor for authorization. Think of it as the digital equivalent of a card terminal — it handles the secure collection and routing of payment information. For online and phone payments, a gateway is required. For in-person card terminals, the terminal itself performs this function.
The payment processor
The processor handles the actual authorization and settlement of the transaction. They communicate with the card networks (Visa, Mastercard) and the issuing bank to verify the card, approve or decline the transaction, and move funds from the customer's bank to yours. The processor is who you have a direct relationship with and who appears on your merchant statement.
The merchant account
A merchant account is a special type of bank account that holds funds from card transactions before they're transferred to your business checking account. Most modern processors combine the merchant account with their processing service — with providers like Square or Stripe, you don't have a separate merchant account at all. With traditional processors, you may have a separate merchant account at a bank.
Do you need a separate gateway?
It depends on how you accept payments:
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In-person only, using a terminal
No separate gateway needed. Your card terminal communicates directly with your processor.
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E-commerce through a platform (Shopify, WooCommerce, etc.)
The platform typically has a built-in gateway or integrates directly with processors. You may not need to think about the gateway separately.
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Custom website or software
Yes — you'll need a gateway that can integrate with your platform. Common options include Authorize.net, NMI, and Stripe's API. The gateway connects your site to your processor.
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Phone and mail orders (MOTO)
A virtual terminal — a web-based interface for manually entering card details — serves as your gateway for phone transactions.
What to look for in a gateway
- Processor compatibility — make sure the gateway works with your processor. Not all gateways connect to all processors.
- Tokenization — the gateway should tokenize card data immediately so your system never stores raw card numbers, reducing your PCI compliance burden.
- Integration support — does the gateway have documented APIs or pre-built integrations for your software stack?
- Recurring billing support — if you charge customers on a recurring basis, the gateway needs to handle stored credentials and scheduled charges.
- Gateway fees — most gateways charge a monthly fee ($10–$25) plus a per-transaction fee ($0.05–$0.10). Understand these before committing.
A common mistake: paying for a gateway you don't need
Many merchants are paying a monthly gateway fee for a service that's redundant with what their processor already provides, or for a gateway they set up years ago and no longer use. If you have multiple processing relationships — a terminal for in-person, a gateway for online, and a virtual terminal for phone — it's worth auditing whether each one is necessary and whether the costs are justified by the volume going through each channel.
Getting your payment stack right
The goal is a payment setup that accepts cards the way your customers want to pay, integrates cleanly with your software, and doesn't have redundant costs. PCI Consulting Group helps businesses design and implement payment setups that fit their actual workflow — from single-location retail to multi-channel businesses with in-person, online, and phone sales. If you're not sure whether your current gateway setup makes sense, we'll take a look.
Not sure if your payment setup is optimized?
We'll review your current gateway, processor, and fees — and tell you exactly what we'd change.
Get a free review