What happens when a customer swipes or taps their card at your register

When a customer pays with a credit card, their card data travels through a chain of companies before the money reaches your bank account. The payment processor is the middleman — they collect the card information, send it to the customer's bank for approval, then tell you whether the transaction went through. If approved, the processor deposits the funds into your business account, usually within one to three business days, minus a fee.

You need three things to accept cards: a merchant account (which your processor sets up), a payment terminal or online gateway (the physical device or software that reads the card), and a processor to handle the transaction. Some companies bundle all three together; others let you mix and match. The processor is the one charging you fees, so understanding their pricing structure matters more than understanding the other pieces.

Key Takeaways

  • Payment processors charge a percentage of each transaction plus a flat fee per sale, and these rates vary widely depending on your business type and sales volume.
  • In-person card readers (like Square or Clover) and online payment forms (like Stripe) have different fee structures, so the cheapest option depends on how you sell.
  • Interchange fees — what the customer's bank charges — are set by Visa and Mastercard and are the same everywhere, but processor markups on top of that fee vary by 0.5% to 2%.
  • Monthly statements from your processor should show individual transaction fees, so you can verify you are being charged what you agreed to pay.
  • Switching processors is possible but requires updating your terminal, payment form, or both, so locking in a good rate upfront saves time later.

How processor fees are structured and what you actually pay

Most processors charge you in one of three ways: interchange-plus pricing, flat-rate pricing, or tiered pricing. Interchange-plus means you pay the interchange fee (set by Visa or Mastercard, usually 1.5% to 2.5% depending on card type) plus a markup the processor adds on top (typically 0.5% to 1.5%). This is usually the cheapest option if you process high volume, because your total cost scales with the interchange rate rather than a fixed percentage.

Flat-rate pricing means every transaction costs the same percentage — often 2.9% plus $0.30 per transaction for in-person sales, or 2.2% plus $0.30 for online sales. You pay the same rate whether a customer uses a debit card (which has lower interchange) or a premium rewards card (which has higher interchange). Flat-rate is simpler to budget for and works well for small businesses with lower volume, but you lose money on debit card sales.

Tiered pricing divides cards into categories — may have access to, mid-may have access to, non-may have access to — and charges different rates for each. may have access to cards (usually basic debit cards) might be 1.69%, mid-may have access to 2.19%, and non-may have access to 3.49%. The processor decides which cards fall into which tier, and the definitions are vague, so you may not know your true cost until you see the statement. Avoid this if you can.

Beyond the per-transaction fee, processors often charge monthly fees ($10 to $50), statement fees, PCI compliance fees, or fees for features like recurring billing. Read the full fee schedule before signing up, because these add up.

In-person payment terminals versus online payment forms

If you sell in a physical location — a retail shop, restaurant, or service business — you need a card reader. The most common options are Square, Toast, Clover, and Ingenico. Square and Clover are popular with small businesses because they work with any phone or tablet, have straightforward pricing, and let you manage inventory and staff from the same device. Toast is built for restaurants and includes table management and kitchen display systems. Ingenico terminals are older, more industrial, and common in established businesses.

If you sell online or over the phone, you use a payment gateway — software that collects card information on your website or through an invoice link. Stripe, PayPal, Square Online, and Shopify Payments are the most common. Gateways charge similar per-transaction fees to in-person readers, but they do not require hardware. Some gateways also handle invoicing, subscriptions, or integration with your e-commerce platform, which can save you money if you would otherwise pay for those separately.

The fee difference between in-person and online is real: in-person card-present transactions are cheaper because the card is physically verified, reducing fraud risk. If you have the option to take a card in person rather than over the phone, your processor will charge you less.

What interchange fees are and why you cannot negotiate them

Interchange is the fee that Visa and Mastercard charge your processor every time a customer uses their card. It goes to the customer's bank, not to Visa or Mastercard. The rate depends on the card type — a basic debit card might be 0.5%, a standard credit card 1.5%, and a rewards card 2.5%. Visa and Mastercard publish these rates publicly, and they are the same no matter which processor you use.

Your processor cannot negotiate interchange down. What they can negotiate is their markup — the percentage they add on top of interchange. If a processor tells you they can lower your interchange rate, they are either lying or they are offering you a discount on their markup, which is a different thing. The confusion is intentional, because it makes pricing hard to compare.

This is why interchange-plus pricing is transparent: you see the actual interchange rate on your statement, plus the processor's markup, and you can verify both. With flat-rate or tiered pricing, the processor bakes interchange into the rate they quote you, so you never see the breakdown.

Reading your processor statement and spotting overcharges

Your monthly statement should list every transaction, the card type, the interchange rate charged, the processor's markup, and the total fee. If it does not, ask for a detailed statement — you have the right to see this. Check three things: that the interchange rates match what Visa and Mastercard publish for that card type, that the processor's markup is what you agreed to, and that monthly fees match your contract.

Common mistakes are processors charging you for transactions that failed or were refunded, charging a higher markup than agreed, or adding fees that were not in the contract. If you spot an error, contact the processor and ask for a credit. Most will correct honest mistakes, but you have to catch them first.

Keep your contract and your statements side by side. If the processor is charging you 2.9% plus $0.30 but your contract says 2.7% plus $0.30, that 0.2% difference adds up fast on high volume. Over a year, processing $100,000 in sales at 2.9% instead of 2.7% costs you $200 extra.

Switching processors and what it costs you in time and money

You can switch processors, but the process takes time. If you use a physical terminal, you have to return it to your old processor and set up a new one with your new processor — usually a few days. If you use a software gateway, you update your website or invoice tool to point to the new gateway, which takes an hour or two. The new processor may charge a setup fee ($0 to $100) and your old processor may charge an early termination fee if you are still under contract.

Before switching, calculate whether the savings are worth the hassle. If you process $50,000 a month and can save 0.3% by switching, that is $150 a month or $1,800 a year. If the switch takes four hours of your time and costs $50 in setup fees, you break even in about a month. If you process $10,000 a month, the same 0.3% savings is only $30 a month, so the switch may not be worth it.

Lock in a good rate upfront. Processors often offer promotional rates for the first few months, then raise them. Ask what your rate will be after the promotional period ends, and get it in writing. If they will not commit to a post-promo rate, that is a sign to look elsewhere.

PCI compliance and security requirements

PCI (Payment Card Industry) compliance is a set of security standards that protect customer card data. If you accept cards, you are required to follow these standards. The main requirement is that you never store full card numbers on your own systems — your processor stores them. If you use a payment terminal or gateway, the processor handles PCI compliance for you. If you build your own payment system, you have to manage PCI yourself, which is expensive and risky.

Most processors charge a PCI compliance fee ($5 to $15 per month) to cover the cost of maintaining secure systems. Some waive it if you use their terminal or gateway. Ask whether PCI fees are included in the quote you receive.

Frequently Asked Questions

What is the difference between a processor and a payment gateway?

A processor is the company that handles the transaction — they collect the card data, send it to the bank, and deposit money into your account. A gateway is the software or device that collects the card information and sends it to the processor. Some companies are both (like Stripe or Square), and some are only one.

Why do I pay different fees for different card types?

Visa and Mastercard set different interchange rates for different cards. A rewards credit card has higher interchange than a basic debit card because the card issuer is paying more to offer rewards. Your processor passes this cost to you, either directly (with interchange-plus pricing) or hidden in a flat rate.

Can I negotiate my processor fees?

You can negotiate the processor's markup, especially if you process high volume or have been with them for years. You cannot negotiate interchange — that is set by Visa and Mastercard. Get quotes from multiple processors and use them to negotiate. Processors often match or beat a competitor's offer to keep your business.

What happens if a customer disputes a charge?

The customer's bank investigates the dispute. If the bank sides with the customer, the processor reverses the charge and you lose the money. You can dispute the reversal if you have proof the customer authorized the charge (a signed receipt, email confirmation, or tracking number). Keep records for at least 18 months in case a dispute comes up later.

How long does it take to get paid after a customer swipes their card?

Most processors deposit money into your bank account within one to three business days. Some offer next-day deposits for an extra fee. Weekend and holiday transactions may take longer. Check your processor's settlement schedule before signing up if cash flow timing matters to your business.