What Is a Payment Gateway?
A payment gateway is the technology that securely processes credit card and other payment transactions between your customer and your store. When a shopper enters their card details at checkout, the gateway encrypts that data, communicates with the customer's bank, and either approves or declines the transaction — all in seconds.
Choosing the right gateway is critical: it affects your transaction fees, the currencies and payment methods you can accept, and how much trust your checkout instils in customers.
Key Factors to Evaluate
1. Transaction Fees
Most gateways charge a percentage per transaction plus a small flat fee (e.g., 2.9% + $0.30). These costs add up quickly at scale, so compare rates carefully. Also watch for:
- Monthly account fees
- International transaction surcharges
- Chargeback fees
- Currency conversion fees
2. Supported Payment Methods
Customers have different preferences. Ensure your gateway supports the methods your audience expects:
- Major credit and debit cards (Visa, Mastercard, Amex)
- Digital wallets (Apple Pay, Google Pay, PayPal)
- Buy Now Pay Later options (Klarna, Afterpay) — increasingly expected by shoppers
- Local payment methods if you're selling internationally
3. Supported Countries and Currencies
Not every gateway operates in every country. If you plan to sell globally, verify that your chosen gateway supports your target markets and allows settlements in your preferred currency without punishing conversion rates.
4. Integration with Your Platform
Most major e-commerce platforms have preferred or native payment gateways. Shopify Payments, for example, waives Shopify's additional transaction fees. Using a non-native gateway often means extra setup steps and additional per-transaction fees from the platform itself. Always check your platform's gateway compatibility list first.
5. Security and Compliance
Any gateway you use must be PCI DSS compliant — this is the industry standard for handling card data securely. Most reputable gateways handle this on your behalf. Look also for 3D Secure support (additional authentication layer) and fraud detection tools.
6. Checkout Experience
A clunky checkout experience loses sales. Consider whether the gateway offers a hosted checkout (customer leaves your site) or an embedded checkout (seamless, stays on your site). Embedded checkouts generally convert better, but require more integration work.
Popular Payment Gateways at a Glance
| Gateway | Best For | Notable Feature |
|---|---|---|
| Stripe | Developers, custom builds | Highly flexible API, global reach |
| PayPal | Wide consumer trust | Buyer protection builds confidence |
| Shopify Payments | Shopify store owners | No extra transaction fees on Shopify |
| Square | Omnichannel (online + in-person) | Seamless POS integration |
| Klarna | Fashion, lifestyle products | Buy Now Pay Later boosts conversions |
Our Recommendation
For most new store owners, start with the payment gateway native to your platform (e.g., Shopify Payments for Shopify, or Stripe for WooCommerce). As your store grows and you understand your customers' payment preferences better, you can add additional gateways to cover more buyers. Don't overcomplicate it early — a simple, reliable checkout is always better than a complex one with more options.