Credit Card Processing 101: How Does It Work?

If you run a business that accepts card payments, you’ve probably wondered what actually happens between the moment a customer swipes their card and the money showing up in your bank account. It feels instant, but there’s a whole system working behind the scenes to make it happen. This guide breaks it all down in plain language, so you know exactly what you’re paying for and why.

Credit card processing is the system that allows businesses to accept payments by credit or debit card. When a customer pays with a card, that payment has to be verified, approved, and transferred from their account to yours. Credit card processing is the infrastructure that makes all of that happen securely and quickly.

For business owners, understanding credit card processing matters because it directly affects your costs, your customer experience, and your cash flow. The more you know about how it works, the better equipped you are to choose the right setup for your business and avoid overpaying in fees.

Here is a simplified breakdown of what happens every time a customer pays with a card:

Step 1: The customer initiates the transaction. They swipe, dip, tap, or enter their card information at your point-of-sale terminal, online checkout, or virtual terminal.

Step 2: The data is sent to your payment processor. Your POS system or payment gateway securely captures the card data and forwards it to your payment processor.

Step 3: The processor contacts the card network. The payment processor sends the transaction details to the appropriate card network, such as Visa or Mastercard, which routes the request to the customer’s bank (the issuing bank).

Step 4: The issuing bank approves or declines. The customer’s bank checks whether the card is valid, the account has sufficient funds or credit, and no fraud flags are triggered. It then sends back an approval or decline.

Step 5: The response is returned to you. That approval or decline travels back through the network to your terminal, usually within a few seconds.

Step 6: Settlement happens later. Approval is not the same as getting paid. At the end of the day (or on a set schedule), approved transactions are batched together and sent for settlement. Funds are typically deposited into your merchant account within one to two business days.

A lot of parties are involved in every single card transaction. Here is who they are and what role each one plays:

The Cardholder is your customer. They initiate the transaction using their credit or debit card.

The Merchant is you. You accept the payment and ultimately receive the funds after processing.

The Issuing Bank is the financial institution that issued the customer’s card, such as Chase, Bank of America, or a local credit union. They are responsible for approving or declining transactions and covering funds on behalf of the cardholder.

The Acquiring Bank (Merchant Bank) is the bank that holds your merchant account and receives the funds on your behalf from the card networks.

The Card Network (Visa, Mastercard, American Express, Discover) sets the rules for how transactions are processed, routes transaction data between banks, and charges interchange fees. They are the backbone of the entire system.

The Payment Processor is the company that facilitates the communication between all of these parties. They handle the technology and infrastructure that moves data from your terminal to the card network and back again.

The Payment Gateway (used primarily for online and virtual transactions) is the software that securely captures and transmits card data to the processor. Think of it as the digital version of a card terminal.

At Coast 2 Coast Payments, we serve as your payment processor and merchant services provider, so you have one point of contact for your processing needs.

Declines happen, and they are not always the result of a maxed-out card. Understanding why can save you and your customers some frustration.

There are two types of declines:

Soft declines are temporary issues that can often be resolved by trying again or using a different card. Common causes include insufficient funds at the moment of the transaction, a temporary hold on the account, or the card being flagged for suspected fraud due to an unusual purchase.

Hard declines are permanent rejections that will not go away with a retry. These typically mean the card is expired, reported lost or stolen, or the account has been closed.

As a merchant, the best practice is to ask the customer to try a different card or contact their bank if the transaction is declined. Attempting the same card multiple times after a hard decline can result in additional fees or flagging from the card networks.

Processing fees are one of the most misunderstood parts of accepting card payments. Here is a breakdown of the main types of fees you might see on your statement:

Interchange fees are set by the card networks (Visa, Mastercard, etc.) and paid to the issuing bank. These are not negotiable and vary based on the card type, the industry, and how the transaction was processed (in-person vs. online). Interchange is typically the largest portion of your overall processing cost.

Assessment fees are also set by the card networks and paid directly to them. These are a small percentage of your monthly volume and are non-negotiable.

Processor markup is the fee your payment processor charges on top of interchange and assessment fees. This is where processors make their money and where you have the most room to negotiate or shop around.

Monthly and Per-Transaction fees may include statement fees, gateway fees, PCI compliance fees, and small per-transaction charges depending on your pricing model.

Interchange Plus (Cost Plus): You pay the actual interchange rate plus a fixed processor markup. This is the most transparent model and often the most cost-effective for businesses with decent volume.

Flat Rate: You pay the same percentage on every transaction regardless of card type. Simple to understand, but often more expensive overall.

Tiered Pricing: Transactions are grouped into qualified, mid-qualified, and non-qualified tiers. This model can be less transparent and more costly if many of your transactions fall into higher tiers.

Cash Discount / Surcharge Programs: Some processors, including Coast 2 Coast, offer programs that allow you to eliminate or significantly reduce your processing fees by passing the cost to the customer for card payments.

A few simple habits can save you money and protect your business over time:

• Review your statements regularly. Fees can change, and errors do happen. Make it a point to look at your monthly processing statement and understand what you are being charged for.
• Keep your POS software and hardware updated. Outdated equipment can create security vulnerabilities and may not support newer card technology like EMV chip or contactless payments.
• Always get an authorization before running a transaction. Never skip the authorization step for large transactions, even for regular customers.
• Settle your batches daily. Leaving transactions in an open batch for more than 24 to 48 hours can result in higher interchange rates and potential settlement delays.
• Train your staff. Your employees handle transactions every day. Make sure they know how to process payments correctly, handle declines professionally, and spot suspicious card activity.
• Choose card-present transactions when possible. In-person, card-present transactions typically carry lower interchange rates than card-not-present transactions (phone orders, manual entry). If you take payments over the phone, a virtual terminal is still the right tool, but be aware of the difference in cost.

Not all processors are created equal, and the wrong choice can cost your business real money. Here is what to look for:

• Transparent Pricing. Make sure you understand exactly what you will be charged before you sign anything. Interchange-plus pricing is generally the most transparent. Watch out for processors that are vague about their markup or bury fees in the fine print.
• Industry Fit. Some processors specialize in certain industries and offer tools designed for your specific business type. At Coast 2 Coast, we work with a wide range of industries including retail, restaurants, firearms dealers, eCommerce, cannabis, and more. If your industry is considered high-risk, you need a processor who has experience getting those accounts approved and keeping them open.
• Hardware and Software Compatibility. Make sure the processor’s systems work with the POS hardware and software you already use, or that they can provide what you need. Switching processors should not mean replacing your entire setup.
• Customer Support. You will want a real person available when something goes wrong. Ask how support is handled, what the hours are, and how quickly issues typically get resolved.
• Contract Terms. Be cautious of long-term contracts with early termination fees. Month-to-month agreements give you the flexibility to switch if your needs change.
• Rate Review. If you are already processing and have not had your rates reviewed recently, it is worth getting a second opinion. Many businesses are overpaying without realizing it.

At Coast 2 Coast, we offer free consultations and statement reviews so you can see exactly what you are paying and whether we can do better for your business. No pressure, just honest numbers.

Most standard merchant accounts are approved within one to two business days. High-risk industries may take a bit longer depending on underwriting requirements, but we work to get you set up as quickly as possible.

A payment processor handles the transfer of data and funds between your bank and the customer’s bank. A payment gateway is the technology (usually software) that captures and securely transmits card data, primarily for online or virtual transactions. Many providers offer both, and the two often work together.

For most small and mid-sized businesses, a dedicated merchant account provides better rates, faster funding, and more stability than aggregator services. It is worth comparing your options based on your volume and industry.

A chargeback occurs when a customer disputes a transaction with their bank and the bank reverses the charge. Chargebacks cost merchants both the transaction amount and a chargeback fee, which can range from $15 to $100 or more. Keeping good transaction records, using proper authorization procedures, and having clear refund policies are the best defenses against chargebacks.