Merchant services credit card processing is the infrastructure that moves money from a customer’s card to a business’s bank account. Covering everything from the moment a card is tapped to the deposit landing a few business days later, card processing involves multiple parties (e.g., issuers, acquirers, networks, processors), distinct pricing structures, and compliance obligations that apply to businesses that accept card payments.

Between September 2024 and 2025, Visa processed 329 billion payment transactions totalling $17 trillion across more than 200 countries and territories.

Below, we’ll cover how the processing chain works, what compliance and fraud obligations come with accepting cards, and how to evaluate processors.

Key takeaways

• Credit card processing moves through three stages—authorisation, clearing, and settlement—and each involves distinct financial institutions and technical handoffs.

• Pricing structures vary considerably: interchange-plus is a more transparent model, while tiered pricing gives processors latitude to assign transactions to higher-cost buckets.

• Choosing a processor involves rate comparison, contract terms, integration support, chargeback tools, and industry fit, all of which affect the cost and reliability of acceptance.

What is merchant services credit card processing?

Merchant services is the category of financial services that lets businesses accept electronic payments. Credit card processing is the mechanism that moves a payment from a customer’s card to a business’s bank account. Together, merchant services credit card processing encompasses the services, software, and hardware that allow a business to accept and process card payments from customers.

How does credit card processing work?

Every card transaction moves through three stages: authorisation, clearing, and settlement.

The process involves several parties working in sequence:

• Cardholder: The customer who initiates the payment

• Issuing bank: The bank that issued the customer’s cards

• Card network: The payment network that connects the issuer and the acquirer, such as Visa or Mastercard

• Acquiring bank: The business’s bank that holds the merchant account and receives funds

• Payments processor: The technical intermediary that routes transaction data between the merchant, networks, and banks

Authorisation happens at the moment of purchase. The terminal or payment gateway sends transaction data to the processor, which routes it to the card network to the issuing bank. The issuer checks available funds or credit, fraud signals, and card validity, then returns an approval or decline, typically within seconds.

Clearing generally happens in batches, once daily. Authorised transactions travel to the card networks, which match them against the original authorisation records and calculate net amounts owed between issuing and acquiring banks. During settlement, the issuing bank transfers funds through the network to the acquiring bank, which deposits them into the merchant account.

The processor’s role is largely invisible to the customer but central to the transaction because it encrypts data, routes messages, manages error handling, and reconciles transactions across the batch.

What types of merchant accounts and processing models are available?

The model you use determines how funds are held, how quickly they’re accessible, and how much control you have over your account. Three distinct structures cover many business situations, each with different onboarding requirements, risk profiles, and trade-offs.

Dedicated merchant accounts

An acquiring bank issues these accounts directly in a business’s name. Ownership means faster access to funds, fewer holds, and greater stability at scale. But getting a merchant account involves underwriting, which means the bank reviews transaction volume, chargeback history, and business financials. This model typically suits businesses that process higher volumes or operate in industries with complicated risk profiles.

Payment service providers

Payment service providers (PSPs) aggregate many businesses under a single master merchant account. Onboarding is fast, and there’s no upfront underwriting, but PSPs have broad authority to hold or pause funds if their risk systems detect unusual activity.

Payment facilitators

Payment facilitators (PayFacs) sit between dedicated accounts and PSPs. They sponsor merchants under their own acquiring agreements but take on more liability and oversight than a pure PSP. This model typically appears in platforms and marketplaces that embed payments for their own users.

What fees and pricing structures apply to credit card processing?

Processing fees have three layers: interchange, assessments, and processor markup. Understanding how those combine determines what you actually pay per transaction.

Here's what you need to know:

• Interchange: The fee the issuing bank is paid on every transaction. Interchange rates are set by the card networks and vary by card type, transaction method, and country.

• Assessments: Smaller fees paid directly to the card networks on every transaction.

• Processor markup: What the processor charges on top of interchange and assessments. This is where pricing models diverge considerably.

Here are the three common pricing structures:

• Interchange-plus pricing: Passes the actual interchange and assessment costs through to the business, then adds a fixed markup. It’s a more transparent model and generally more cost-efficient for businesses with consistent volume.

• Flat-rate pricing: Charges a single percentage regardless of card type. Predictable and easy to reconcile, but you pay a premium on low-interchange transactions.

• Tiered pricing: Buckets transactions into “qualified,” “midqualified,” and “nonqualified” tiers based on criteria defined by the processor. It’s traditionally the least transparent model, and processors have wide latitude to assign transactions to higher-cost tiers.

Beyond per-transaction fees, watch for monthly fees, chargeback fees, and early-termination penalties on long-term contracts.

What compliance, security, and risk factors affect merchant services credit card processing?

The Payment Card Industry Data Security Standard (PCI DSS), chargebacks, and security measures are the main areas where merchants carry substantial obligations.

PCI DSS

The PCI DSS sets the baseline compliance requirements for any business accepting card payments. It covers how cardholder data is stored, transmitted, and protected. Compliance level depends on transaction volume. For example, Level 1 merchants—those with more than 6 million transactions annually—face full third-party audits, while smaller businesses complete self-assessment questionnaires. Using a processor that handles cardholder data directly through hosted fields or tokenisation considerably reduces your PCI scope.

Tokenisation

This is when a card number is replaced with a unique token that has no value outside the specific payment system. It’s how recurring billing works securely. The actual card number lives with the processor, and the token is what your system references for future charges.

Encryption

This protects card data in transit. Point-to-point encryption (P2PE) encrypts card data at the terminal before it enters any other system, which makes intercepted data unreadable.

Chargebacks

Chargebacks are disputes cardholders file with their issuing banks. When a cardholder files a dispute, funds are pulled back from the merchant while the bank investigates. Businesses can contest disputes with evidence, but the process is time-consuming, and the burden of proof sits with the merchant. Chargeback rates above 1% of transactions can prompt additional scrutiny or account termination by card networks. Clear billing descriptors, responsive customer service, and accurate product descriptions are effective preventive measures.

How do you choose a credit card processor?

No single processor is right for every business. You’ll need to weigh several factors in your decision.

Consider the following:

• Pricing transparency: Make sure you can see the full fee schedule before signing. For example, whether ancillary fees are disclosed upfront.

• Contract terms: Determine whether there’s a long-term contract with an early termination fee, a month-to-month agreement, or another variation.

• Integration support: Find out if the processor offers application programming interfaces (APIs), software development kits (SDKs), or pre-built plugins for your existing stack, including your point-of-sale (POS) system, ecommerce platform, or invoicing software.

• Hardware compatibility: If you’re selling in person, determine which terminals the processor supports and whether they’re locked to that processor.

• Chargeback and dispute tools: Ask if the processor offers automated dispute responses, evidence submission tools, or pre-dispute alerts.

• Settlement speed: There should be a standard funding timeline with next-day or same-day settlement availability.

• Support quality: Look for 24/7 support, or confirm their escalation path when something goes wrong midtransaction on a busy Saturday.

Stripe Payments handles the full credit card processing stack without the need for a separate merchant account through a bank. Onboarding is fast, and the platform is built to scale with developer-friendly integrations. Stripe’s pricing is also transparent, with no setup fees, monthly fees, or hidden fees.

How Stripe Payments can help

Stripe Payments provides a unified, global payments solution that helps any business – from scaling startups to global enterprises – accept payments online, in person and around the world.

Stripe Payments can help you:

• Optimise your checkout experience: Create a frictionless customer experience and save thousands of engineering hours with prebuilt payment UIs, access to 125+ payment methods and Link, a wallet built by Stripe.

• Expand to new markets faster: Reach customers worldwide and reduce the complexity and cost of multicurrency management with cross-border payment options, available in 195 countries across 135+ currencies.

• Unify payments in person and online: Build a unified commerce experience across online and in-person channels to personalise interactions, reward loyalty and grow revenue.

• Improve payments performance: Increase revenue with a range of customisable, easy-to-configure payment tools, including no-code fraud protection and advanced capabilities to improve authorisation rates.

• Move faster with a flexible, reliable platform for growth: Build on a platform designed to scale with you, with 99.999% historical uptime and industry-leading reliability.

Learn more about how Stripe Payments can power your online and in-person payments or get started today.