Payment gateway

What is a payment gateway and how does it work?

A payment gateway is a technology that securely transmits payment information from a customer to the acquiring bank during an online or in-store transaction. It acts as the digital equivalent of a point-of-sale terminal, authorizing payments and ensuring that customer data is encrypted and protected.

Here’s how it works:

• A customer enters payment details at checkout
• The gateway encrypts the data and sends it to the payment processor
• The payment is authenticated and either approved or declined
• The response is returned to the merchant and customer in real time

Payment gateway and payment processor are often used interchangeably but they’re distinct roles. The gateway is the secure front-end that captures and transmits card data; the processor is the back-end service that communicates with card networks and banks to actually move the money.

Why payment gateways matter?

Payment gateways are essential for online businesses and ecommerce platforms because they:

• Enable secure transactions
• Protect sensitive data through encryption and fraud detection
• Support various payment methods, including cards, wallets, and bank transfers
• Improve user trust with seamless checkout experiences

For subscription brands, the gateway also tokenizes the customer’s saved payment method so that every recurring billing charge can run automatically on each renewal without re-collecting card details. Whether you are running a Shopify store or a subscription-based service, a reliable payment gateway is critical for smooth, secure transactions.

Types of payment gateways

There are three main types of payment gateways:

• Hosted gateways: redirect users to a third-party page (e.g., PayPal, Razorpay Checkout).
• Self-hosted gateways: payment info is collected on the merchant site but processed externally.
• API/Integrated gateways: fully integrated within the merchant’s platform for seamless checkout (e.g., Stripe, Braintree).

Example of a payment gateway

A customer visits an online store selling handmade candles. They add items to their cart and proceed to checkout. The store uses Stripe as its payment gateway. When the customer enters their credit card details and clicks ‘Pay,’ Stripe securely authorizes the payment, deducts the amount from the customer’s bank, and confirms the transaction.

Driftcharge Tip

Choose a payment gateway that aligns with your business needs, supports your region’s preferred payment methods, and is PCI compliance certified to safely handle cardholder data.

Ganesh Pawar

• 

Ganesh Pawar is the founder of Driftcharge, a subscription management app designed to help Shopify merchants streamline and scale their subscription businesses. With a deep focus on solving real-world pain points—like legacy account page support, flexible subscription options, and advanced analytics—Ganesh is passionate about building tools that drive growth and retention.