What is Payment Gateway?

Payment Gateway Explained

A payment gateway is the technology that handles online transactions on your website. When a customer enters their card details during checkout, the payment gateway securely transmits that information to the bank or card network, processes the transaction, and sends back a confirmation (or a decline) to your website.

Think of it as the online equivalent of a card terminal in a physical shop. You never see the card data yourself. The gateway handles the sensitive bits securely so you don't have to.

Popular payment gateways include Stripe, PayPal, Square, Worldpay, and SagePay. Each has different features, pricing structures, and levels of customisation. Some are simple plug-and-play solutions, while others give developers more control over the experience.

Most payment gateways charge a small percentage fee per transaction (typically around 1.4% to 2.9% plus a fixed fee), rather than a large upfront cost.

Why Payment Gateway Matters

If you sell anything online, you need a payment gateway. Without one, there's no way to accept card payments on your website.

The right payment gateway affects your customer experience, security, and operational costs. A clunky or unfamiliar payment screen can put people off at the final step. A smooth, trusted checkout with recognisable branding (like Stripe or PayPal) builds confidence and reduces cart abandonment.

Security is critical too. Payment gateways handle PCI compliance (the security standards for card data) on your behalf, which means you don't have to store sensitive payment information on your own servers.

Where You'll Come Across It

Every time you pay for something online with a card, a payment gateway is working behind the scenes. If you've ever been redirected to a PayPal screen or seen a Stripe-powered form pop up during checkout, you've seen a payment gateway in action.

When building an ecommerce site, your developer will help you choose and integrate a payment gateway that suits your business and customer base.

Practical Example

You launch an online shop selling artisan coffee. A customer orders two bags, enters their card details, and clicks "Pay Now." Your payment gateway (Stripe) securely sends the card information to the customer's bank, gets the transaction approved, takes payment, and confirms the order on your site. The money (minus Stripe's fee) lands in your bank account a few days later. You never see or store the card details.

Frequently Asked Questions

Which payment gateway is best?

It depends on your needs. Stripe is popular with developers for its flexibility. PayPal is widely trusted by consumers. Square works well if you also sell in person. Your web developer can recommend the best fit for your business.

Do payment gateways charge fees?

Yes. Most charge a small percentage per transaction, typically between 1.4% and 2.9% plus a fixed fee of around 20p. There are usually no monthly fees for basic accounts.

Is it safe to take payments on my website?

Yes, as long as you use a reputable payment gateway and have an SSL certificate. The gateway handles PCI compliance, which means sensitive card data is processed securely without being stored on your server.