Getting paid should be the simplest part of running a store. A customer wants to buy something; they pay; you receive the money. In practice, payment processing involves a complex ecosystem of processors, gateways, fees, and compliance requirements that can confuse even experienced merchants.
Cutting through this complexity helps you make better decisions about how to accept payments—and how much you should be paying to do so.
Understanding the Payment Stack
When a customer enters their credit card, multiple parties get involved. The payment gateway encrypts and transmits the card data. The processor routes the transaction through card networks. The issuing bank authorizes the charge. The acquiring bank deposits funds to your account. Each party takes a cut.
Most merchants don't need to understand these mechanics deeply, but knowing they exist explains why payment processing isn't free and why rates vary.
The True Cost of Payment Processing
Payment processing fees typically have three components. Interchange is the base rate set by card networks and paid to issuing banks—this is largely non-negotiable. Assessment fees go to the card networks themselves. The processor's markup sits on top for their services.
The total typically ranges from 2.4% to 3.5% of transaction value, depending on card type, transaction method, and your negotiated rates. Premium rewards cards cost more to process than basic debit cards. Card-present transactions (swiped or tapped) cost less than card-not-present (online) transactions due to lower fraud risk.
CartOS and Stripe Integration
CartOS integrates natively with Stripe, one of the most respected payment processors for online businesses. This integration provides several advantages: transparent pricing, excellent developer infrastructure, broad payment method support, and strong fraud protection.
Stripe's pricing model is straightforward—a flat percentage plus per-transaction fee with no monthly minimums or hidden costs. You pay for what you process, making it easy to forecast costs as your business scales.
Beyond Credit Cards
Modern customers expect payment options beyond traditional credit cards. CartOS supports digital wallets including Apple Pay, Google Pay, and Shop Pay. These options speed checkout for customers with pre-configured payment methods and reduce cart abandonment from customers unwilling to enter card details manually.
Buy Now, Pay Later options let customers split purchases into installments. For higher-priced items, this can significantly increase conversion by making purchases more accessible without requiring you to manage credit risk.
In-Person Payments with Stripe Terminal
For businesses with physical locations, CartOS integrates with Stripe Terminal hardware for in-person payments. This provides unified payment processing across online and offline channels. The same Stripe account, the same reporting, the same payout schedule—regardless of where the sale originated.
Card-present transactions through Stripe Terminal typically have lower processing rates than online transactions, reflecting the reduced fraud risk. Tap-to-pay acceptance keeps checkout fast for customers and keeps your rates optimal.
Managing Payment Security
Payment security isn't optional. PCI DSS compliance requirements apply to any business handling card data. Violations can result in fines, increased processing rates, or losing the ability to accept cards entirely.
CartOS handles the heavy lifting of PCI compliance. Card data is tokenized immediately—your systems never store actual card numbers. Checkout pages meet security requirements. The platform maintains its PCI certification so you don't have to manage that compliance independently.
Handling Refunds and Disputes
Returns happen. Sometimes customers dispute charges. A good payment setup makes handling these situations straightforward rather than painful.
CartOS processes refunds directly from order management. Click refund, and the money returns to the customer's card through the same path it arrived. No separate login to a payment portal, no manual reconciliation.
For disputes, Stripe provides tools to respond with evidence. CartOS surfaces the relevant order data to help you make your case. Clear transaction records and proper receipts prevent many disputes from escalating.
International Payments
Selling globally introduces currency complexity. Customers prefer paying in their local currency. Exchange rates fluctuate. Some payment methods are popular in specific regions but unknown elsewhere.
CartOS supports multi-currency pricing, letting you set prices in different currencies for international customers. Stripe handles the currency conversion and deposits funds in your preferred currency. Regional payment methods can be enabled for markets where they're popular.
Reconciliation and Reporting
Understanding your payment data matters for accounting, forecasting, and identifying issues. CartOS provides comprehensive payment reporting—transaction volumes, fee breakdowns, payout timing, and refund rates.
Payout reconciliation connects Stripe deposits to the specific orders they contain. When money appears in your bank account, you can see exactly which orders it represents. This makes bookkeeping straightforward and helps catch any discrepancies quickly.
Choosing the Right Payment Setup
For most CartOS merchants, the native Stripe integration provides everything needed: competitive rates, comprehensive payment method support, unified online and in-person processing, and tight platform integration.
Some businesses have specific needs that require additional consideration—very high volume might justify negotiated rates, certain industries have specialized requirements, and some international scenarios need specific solutions. CartOS can accommodate these situations, but the standard Stripe integration serves the vast majority of merchants well.
Payment processing doesn't have to be confusing or expensive. CartOS integrates with Stripe to provide transparent, secure, full-featured payment acceptance without the complexity of managing multiple providers.