A payment processor is the company that moves money from a customer's bank account or card to yours
When a customer pays you by card, their bank doesn't talk directly to your bank. A payment processor sits between them. It takes the payment information, checks that the card is real and has funds, sends the request to the customer's bank, waits for approval, and then tells your bank to deposit the money into your account. Without a processor, you would have to build and maintain connections to every bank and card network yourself—which is why processors exist.
The processor doesn't hold the money. It doesn't decide whether you get paid. It moves the request through the system and reports back whether the transaction succeeded or failed. The actual funds move through the banking system itself, not through the processor's hands.
Key Takeaways
- A payment processor connects your business to the banking system by taking payment information from customers and routing it to their banks for approval.
- Processors charge a fee for each transaction, usually a percentage of the sale plus a flat amount, and these fees vary by payment method and processor.
- The processor is separate from your merchant bank (the bank that holds your business account) and from the card networks like Visa and Mastercard.
- Settlement—when money actually lands in your account—typically takes one to three business days after the customer's bank approves the transaction.
- Processors handle disputes, chargebacks, and fraud detection, which is why they need information about your business and how you operate.
How a processor moves a payment through the system
The sequence happens in seconds, but it involves multiple stops. When a customer enters their card number on your website or at your register, that data goes to the processor first. The processor encrypts it and sends it to the card network—Visa, Mastercard, American Express, or Discover. The network routes the request to the customer's bank, which checks the account balance and fraud rules. The bank sends back a yes or no. The processor receives that response and tells your point-of-sale system or website whether the transaction went through.
If approved, the processor records the transaction and sends it to your merchant bank in a batch, usually at the end of the day. Your merchant bank then requests the funds from the customer's bank through the banking system. That request takes one to three business days to settle—meaning the money actually appears in your account. During that time, the funds are in transit through the banking system, not sitting with the processor.
If the transaction is declined, the processor tells you when ready and the customer knows right away that the card didn't work. No money moves.
What processors charge and why fees vary
Payment processors charge a fee on each transaction. The fee structure usually has three parts: a percentage of the sale amount (often 2 to 3 percent), a flat per-transaction fee (often $0.30), and sometimes a monthly account fee. A $100 card sale might cost you $2.30 to $3.30 in processor fees, depending on which processor you use and what type of card the customer used.
Fees vary because different payment methods cost the processor different amounts to handle. A credit card transaction costs more than a debit card transaction because credit card networks charge the processor higher interchange fees. A transaction where the customer is physically present (card swiped in your store) costs less than a transaction where the card number is typed in online, because in-person transactions have lower fraud risk. Some processors charge extra for international cards or for certain industries like nonprofits or charities.
You negotiate processor fees based on your sales volume and business type. A restaurant processing $50,000 a month will get better rates than a small online seller processing $2,000 a month. Some processors publish their rates; others require you to contact them for a quote.
The difference between a processor, a merchant bank, and a payment gateway
These three terms are often confused because they work together, but they are separate companies doing different jobs. Your merchant bank is the bank that holds your business checking account and receives the settled funds. Your payment processor moves the transaction through the system and charges you a fee. A payment gateway is the software that encrypts the customer's card data and sends it to the processor—it is the tool your website or register uses to talk to the processor.
Some companies combine these roles. A processor might also provide the gateway software. A merchant bank might own a processor. But they are legally and functionally separate. Your merchant bank doesn't see the card number—the processor and gateway handle that. The processor doesn't hold your money—your merchant bank does. The gateway doesn't approve or decline transactions—the processor and the customer's bank do.
Why processors ask for business information and hold reserves
When you sign up with a processor, they ask for details about your business, your owners, your website, what you sell, and how much you expect to process each month. They do this because they are liable if you commit fraud or if chargebacks spike. If a customer disputes a charge and wins, the processor often has to refund the money to the customer's bank, and then they try to recover it from you. If you disappear or can't pay, the processor absorbs the loss.
Some processors hold a reserve—a percentage of your sales that they don't deposit into your account right away. Instead, they hold it for 30, 60, or 90 days. If chargebacks come in during that time, they use the reserve to cover them. If no chargebacks occur, they release the reserve to you. Processors are more likely to hold reserves for high-risk businesses like online retailers, subscription services, or industries with high chargeback rates.
What happens when a transaction fails or a customer disputes a charge
If a transaction is declined at the moment of purchase, the processor tells you and the customer when ready. The customer can try a different card or payment method. No money moves and no fee is charged (though some processors charge a small fee for a declined transaction attempt).
If a transaction goes through but the customer later disputes it—claiming they didn't authorize it, didn't receive the product, or were charged twice—the processor handles the dispute process. The customer contacts their bank, which contacts the processor, which contacts you. You have a window (usually 7 to 10 days) to provide evidence that the transaction was legitimate: a signed receipt, a shipping confirmation, an email exchange with the customer. If you can't prove it, the customer's bank reverses the charge and the money comes back out of your account. This is called a chargeback.
If your chargeback rate gets too high, the processor can raise your fees, require you to hold a larger reserve, or close your account. This is why processors care about your business practices—high chargebacks mean they lose money.
How to choose a processor for your business
The main factors are fees, the payment methods they support, and the tools they provide. Some processors are built for online businesses and provide a shopping cart and invoice system. Others focus on in-person payments and integrate with point-of-sale registers. Some specialize in specific industries like nonprofits, restaurants, or subscription services.
Compare the all-in cost, not just the percentage rate. A processor charging 2.5 percent plus $0.30 per transaction might cost you less than one charging 2.2 percent plus $0.50 if you process many small transactions. Ask whether they charge monthly fees, setup fees, or fees for chargebacks and disputes. Ask what happens to your reserve and when it gets released. Ask how long settlement takes—most say one to three business days, but some are faster or slower.
Check whether they support the payment methods your customers use. If you sell online, you need credit card processing. If you sell in person, you need a point-of-sale system or a mobile card reader. If you sell subscriptions, you need recurring billing. Not all processors offer all of these.
Frequently Asked Questions
Does the processor hold my money after I make a sale?
No. The processor moves the transaction through the system and charges you a fee. Your merchant bank holds the money for one to three business days while it settles through the banking system. Some processors also hold a reserve—a percentage of sales set aside for chargebacks—but that is separate from normal settlement.
Can a processor refuse to work with me?
Yes. Processors can decline to work with certain industries (like gambling or high-risk financial services), certain countries, or businesses with poor chargeback histories. They can also close your account if your chargeback rate becomes too high or if they suspect fraud. They are not required to work with you.
What if my processor goes out of business?
Your money in your merchant bank account is safe—it is held by the bank, not the processor. But if the processor closes suddenly, you may lose access to transaction history and dispute records. This is why it is worth choosing a processor that has been in business for several years and has a stable reputation.
Do I need a different processor for online and in-person payments?
Not necessarily. Many processors support both. But some specialize in one or the other and offer better tools or lower fees for that channel. A processor built for online businesses might not have good point-of-sale integration, and vice versa. Check what your processor supports before signing up.
Why does my processor charge different fees for different card types?
Because the card networks and the customer's bank charge the processor different amounts depending on the card. A credit card costs more to process than a debit card. A rewards card costs more than a basic card. The processor passes some of these costs to you. This is called interchange, and it is set by the card networks, not by your processor.