What Is a Payment Gateway?
A payment gateway is the technology that securely transmits payment data between your online store, the customer's bank, and your merchant account. Think of it as the digital equivalent of a card terminal — it authorises transactions and ensures funds reach your account.
Choosing the wrong gateway can lead to poor checkout experiences, lost sales, unnecessary fees, and integration headaches. Getting it right from the start saves considerable time and money.
Key Factors to Evaluate
1. Compatibility with Your Ecommerce Platform
Not every gateway works with every platform. Before you research fees or features, confirm the gateway integrates with your store — whether that's Shopify, WooCommerce, Magento, BigCommerce, or a custom-built site. Most major gateways publish a list of supported platforms and offer plugins or APIs for integration.
2. Transaction Fees and Pricing Model
Gateway pricing generally falls into one of three models:
- Flat-rate pricing — a fixed percentage per transaction, regardless of card type (e.g. 2.9% + 30¢). Simple and predictable.
- Interchange-plus pricing — the actual interchange rate charged by the card network, plus a small markup. Often cheaper for higher-volume stores.
- Tiered pricing — transactions are grouped into "qualified", "mid-qualified", and "non-qualified" tiers. Often the least transparent model.
3. Supported Payment Methods
Modern customers expect choice. A strong gateway should support:
- Visa, Mastercard, American Express, Discover
- Digital wallets: Apple Pay, Google Pay
- Buy Now, Pay Later options (Klarna, Afterpay)
- International payment methods if you sell globally
4. Security and PCI Compliance
Any gateway you choose should be PCI DSS compliant — this is the global security standard for card data handling. Look for gateways that offer tokenisation (replacing card data with a unique token), 3D Secure authentication, and fraud detection tools. These features protect both you and your customers.
5. Checkout Experience
A clunky checkout is one of the biggest causes of cart abandonment. Evaluate whether the gateway offers:
- Hosted checkout pages (fast to set up, PCI scope reduced)
- Embedded/inline forms (seamless UX, more customisable)
- Mobile-optimised payment flows
- One-click payments for returning customers
6. Settlement Speed
How quickly do funds reach your bank account? Standard settlement is one to three business days, but some providers offer next-day or even same-day payouts (sometimes for a small fee). Cash flow matters — especially for newer businesses.
Hosted vs. Self-Hosted Gateways
| Type | How It Works | Best For |
|---|---|---|
| Hosted Gateway | Customer is redirected to the provider's secure payment page | Small stores, quick setup |
| Self-Hosted / API | Payment form lives on your site; data sent via API | Custom stores, brand consistency |
| iFrame / Embedded | Provider form embedded within your site's page | Balance of control and simplicity |
Questions to Ask Before You Commit
- Is there a setup fee or monthly minimum?
- What are the chargeback fees if a customer disputes a payment?
- Can you accept payments in multiple currencies?
- What support is available — phone, chat, email?
- Is there a long-term contract or can you cancel month to month?
The right payment gateway balances cost, security, and customer experience. Take the time to test a few options — most offer free trials or developer sandboxes — before making a final commitment.