What payment processing services do

A payment processor is a company that moves money from a customer's bank account or card to your business account when someone buys something from you. You do not handle the card details yourself — the processor does that part, which protects both you and your customer. The processor also checks whether the card is valid, whether the account has enough money, and whether the transaction looks fraudulent.

Payment processors work with banks, credit card networks (Visa, Mastercard, American Express, Discover), and your own bank to complete each transaction. When a customer pays you, the processor collects the money, holds it briefly, and deposits it into your business bank account — usually within one to three business days, though timing varies by processor and account type.

Most small businesses use a processor because they have to: credit card networks require it. You cannot legally accept a Visa card and deposit the money yourself. The processor is the middleman that makes the whole system work.

Key Takeaways

  • Payment processors charge a percentage of each transaction (usually 2 to 3 percent) plus a small flat fee per transaction, and these rates vary widely by processor and business type.
  • You need a processor to accept credit cards, debit cards, or digital wallets — you cannot accept these payments without one, even if you have a business bank account.
  • The processor holds your money briefly before depositing it, and the time it takes (settlement period) ranges from same-day to three business days depending on the processor and your account.
  • Different processors work with different types of businesses, so a processor that works well for an online store may not be the right fit for a restaurant or a service business.
  • Monthly fees, setup fees, and equipment costs vary by processor, so comparing total cost — not just transaction fees — matters more than comparing one rate alone.

How transaction fees work

Most payment processors charge you a percentage of the sale amount plus a flat fee per transaction. A typical rate might be 2.9 percent plus $0.30 per transaction, but this varies. Some processors charge 2.2 percent plus $0.10. Others charge 3.5 percent plus $0.50. The exact rate depends on the processor, your industry, your sales volume, and the type of card used (a rewards card costs more to process than a basic card).

The percentage and flat fee are deducted from the money the customer paid. If a customer buys something for $100 and your processor charges 2.9 percent plus $0.30, you receive $96.70 and the processor keeps $3.30. This happens automatically — you do not send an invoice or pay a separate bill.

Some processors also charge a monthly minimum or a monthly fee if your sales volume is low. Others charge nothing monthly but charge higher per-transaction fees. A few charge a flat monthly fee instead of per-transaction fees. The lowest-cost option for your business depends on how much you sell each month.

Settlement: when you actually get the money

The processor does not deposit money into your account the same day you make a sale. Instead, the processor collects transactions throughout the day, bundles them, and sends them to your bank in a batch. This is called the settlement period. Most processors settle once per business day, usually in the evening or overnight.

After the processor sends the batch to your bank, your bank takes another day or two to actually deposit the money into your account. So if a customer pays you on a Monday morning, you might not see the money until Wednesday morning — a two-day delay. Some processors offer same-day or next-day settlement for an extra fee. Others offer it automatically if your sales volume is high enough.

Weekends and holidays extend the timeline. A sale on Friday might not settle until Monday, and then not deposit until Wednesday. This matters if you need cash quickly or if you are managing a tight cash flow.

Types of payment processors and how they differ

Payment processors fall into a few categories based on how they work and what they cost. Interchange-plus pricing shows you the actual cost the card network charges, plus the processor's markup. This is usually the cheapest option if you sell a high volume, but it requires a contract and a dedicated terminal. Flat-rate pricing charges the same percentage on every transaction regardless of card type — simpler to understand, but usually more expensive than interchange-plus if you sell a lot.

Tiered pricing sorts transactions into categories (may have access to, mid-may have access to, non-may have access to) and charges a different rate for each. A basic debit card might be "may have access to" at 1.69 percent, while a rewards credit card might be "non-may have access to" at 3.29 percent. This can be hard to predict because you do not always know which tier a card will fall into until after the sale.

Some processors specialize in certain industries. A processor built for restaurants might include table management and kitchen display systems. A processor for e-commerce might integrate with your website and shopping cart. A processor for service businesses might handle appointment booking and invoicing. Choosing a processor that matches your business type usually means lower fees and better features.

Equipment and setup costs

To accept card payments in person, you need a payment terminal — a physical device that reads the card or accepts a tap or chip. Some processors sell terminals, some lease them, and some let you use your own phone or tablet with a card reader attachment. Costs vary widely: a basic terminal might cost $100 to $300 to buy, or $20 to $50 per month to lease. A phone-based reader might cost $30 to $100 one time.

Some processors charge a setup fee when you open an account — usually $0 to $100. Others charge nothing upfront but charge higher monthly or per-transaction fees. A few charge a PCI compliance fee (usually $10 to $20 per month) to cover the cost of keeping your account find and meeting payment card industry standards.

If you accept payments online, you do not need a physical terminal, but you do need a way to securely collect card details on your website. Most online processors provide this for free as part of their service, though some charge a monthly gateway fee ($10 to $30) if you use your own shopping cart software instead of theirs.

Comparing processors: what to look at

Do not compare processors by transaction fee alone. Instead, calculate your total monthly cost under each processor based on your actual sales volume and mix of card types. If you sell $10,000 per month, a processor charging 2.9 percent plus $0.30 costs you about $290 per month in fees. A processor charging 2.2 percent plus $0.10 costs about $220 per month — a $70 difference. But if that second processor charges a $50 monthly fee and the first does not, the difference shrinks to $20.

Also consider settlement speed, customer support availability, and whether the processor integrates with tools you already use (your accounting software, your point-of-sale system, your website platform). A processor that costs $5 more per month but saves you an hour of manual data entry each week is cheaper in reality.

Read the contract carefully. Some processors lock you in for a year or charge an early termination fee if you leave. Others let you cancel anytime. Some charge hidden fees for things like monthly statements, batch fees, or voided transactions. The processor's website usually lists standard fees, but call and ask about any fees not listed.

ACH transfers and bank transfers as alternatives

If you do not accept credit cards, you can ask customers to pay you directly through their bank using an ACH transfer (Automated Clearing House). This is free or very cheap — usually $0 to $1 per transaction. However, ACH transfers take three to five business days to arrive, and customers have to know your bank account number, which creates a security risk if shared over email or text.

Some businesses use a hybrid approach: they accept credit cards through a processor for customers who prefer that, and they offer an ACH option for customers who want to save money or who do not have a credit card. This requires managing two payment methods, which adds complexity.

ACH transfers are common for invoicing and subscription payments, where the customer is already trusted and the payment is expected. For retail or one-time sales, credit card processing through a processor is the standard.

Frequently Asked Questions

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

A payment gateway is the software that collects card details on your website or app. A payment processor is the company that actually moves the money. Many companies do both, so the distinction is blurry in practice. For your purposes, you need both functions — one to collect the information securely and one to move the money.

Can I use the same processor for online and in-person payments?

Yes. Most major processors (Square, Stripe, PayPal, Toast) let you accept payments online, on your phone, and on a physical terminal all under one account. Rates may differ slightly between online and in-person, but you manage everything in one dashboard.

What happens if a customer disputes a charge?

The customer contacts their bank, and the bank contacts the processor. The processor then contacts you and asks for proof that the transaction was legitimate (a receipt, a shipping confirmation, or a signed contract). If you cannot prove it, the money is refunded to the customer and deducted from your account. This is called a chargeback.

Do I have to use the processor's terminal, or can I use my own?

It depends on the processor. Some processors only work with their own terminals. Others are processor-agnostic and work with any terminal that supports their payment network. Ask the processor directly before buying or leasing equipment.

What if I want to switch processors later?

You can switch anytime if your contract allows it. Check your contract for early termination fees. You will need to update your payment settings on your website or point-of-sale system, and you may need to return leased equipment. The processor does not own your customer data, so switching does not affect your customers.