What Happens When You Process Credit Cards
Processing credit cards is the behind-the-scenes workflow that moves money from a customer's card issuer to a merchant's bank account. Every transaction passes through a chain of parties—the merchant, the payment processor, the card network, and the issuing bank—each verifying and forwarding the request. Understanding this chain helps business owners choose the right processor, price their goods confidently, and reduce declined transactions.
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Key Players in Credit Card Processing
A transaction typically involves five entities. The merchant initiates the sale and sends card data to the payment processor or gateway. The processor routes the request to the card network, such as Visa or Mastercard. The network forwards the authorization request to the issuing bank, which approves or declines based on available credit and fraud checks. The response travels back through the same path, and the merchant completes the sale.
- Merchant: initiates the transaction and collects card data
- Payment Processor: handles communication between merchant and card network
- Card Network: routes requests and sets interchange rules
- Issuing Bank: approves or declines the transaction
- Acquiring Bank: settles approved funds into the merchant's account
Step-by-Step Authorization and Settlement
When a card is swiped, dipped, or tapped, the processor encrypts the data and sends an authorization request. The issuing bank checks the card's status, credit limit, and fraud indicators, returning an approval code or a decline reason. This step takes seconds. Settlement occurs later, usually in batches at the end of the day, when the processor sends approved transactions to the card network for final posting and funds transfer.
Authorization
The issuing bank places a temporary hold for the approved amount. The merchant receives an approval code, and the customer sees the pending charge on their account.
Settlement and Funding
The processor batches approved transactions, submits them for settlement, and the acquiring bank deposits the net amount—minus fees—into the merchant's designated bank account.
Credit Card Processing Fee Structures
Merchants pay for processing through several fee types. Interchange fees are set by card networks and paid to the issuing bank; they vary by card type and transaction size. Assessment fees go to the card network itself. Processor markup is the fee the payment processor charges on top of interchange and assessment, often expressed as a flat rate per transaction or a percentage plus a per-item fee.
| Fee Type | Typical Range | Paid To |
|---|---|---|
| Interchange | 1.15%–3.25% + $0.10–$0.30 | Issuing Bank |
| Assessment | 0.13%–0.15% | Card Network |
| Processor Markup | Varies widely; 0.15%–0.50% + $0.10 | Payment Processor |
Flat-rate processors simplify pricing by bundling interchange, assessment, and markup into a single percentage, which can be attractive for small businesses but often costs more on larger transactions.
Payment Methods for Processing Credit Cards
Merchants can accept cards through several channels. In-person terminals and point-of-sale systems support chip, contactless, and swipe transactions and generally offer the lowest interchange rates. Online payments use payment gateways that securely transmit card data to the processor. Mobile card readers attach to smartphones or tablets, allowing field service businesses and pop-up retailers to accept cards anywhere.
- In-person POS terminals: lowest rates, requires physical hardware
- Payment gateways: for e-commerce, integrates with shopping carts
- Mobile card readers: flexible, ideal for on-the-go sellers
- Virtual terminals: manual entry for phone or mail orders
Security and Fraud Prevention
Credit card processing must meet strict security standards. The Payment Card Industry Data Security Standard, or PCI DSS, governs how card data is stored, transmitted, and processed. Using end-to-end encryption and tokenization reduces the risk of data breaches. Tokenization replaces card numbers with unique tokens, so sensitive data never touches the merchant's systems. Additional fraud tools include address verification, velocity checks, and 3D Secure authentication.
Choosing a Processor
When selecting a processor, merchants should compare interchange-plus pricing versus flat-rate models, evaluate contract terms and early termination fees, and confirm support for their sales channels—online, in-store, or mobile. A processor that offers transparent reporting, fast settlement, and responsive support reduces operational friction and helps the business scale.