What is a Payment Gateway? How it Works Explained (2026)

With the world becoming increasingly cashless, payment gateways have become essential infrastructure for any business accepting online payments. Before selecting the right one for your business, here is what you need to know about how they work, what types exist, and what to look for.

What is a payment gateway?

A payment gateway is a technology that enables secure processing of online transactions between customers and merchants. With a payment gateway, businesses are enabled to accept card payments, offer a variety of payment methods to customers, secure their financial transactions, accept bank payments, and more. Payment gateways act as intermediaries, encrypting and transmitting payment information from a customer’s device to the acquiring bank. Technologically, payment gateways use Secure Socket Layer (SSL) encryption to protect data during transmission. They interact with the merchant’s website through Application Programming Interfaces (APIs) to handle transaction requests.

This process involves three basic steps:

1. Authorisation: Verifying payment details with the issuing bank.
2. Authentication: Ensuring the transaction’s legitimacy.
3. Settlement: Transferring funds from the customer’s bank to the merchant’s account.

Payment gateways support various payment methods and comply with standards like PCI-DSS to ensure security and reliability. They also often use tokenization to replace sensitive card information with unique tokens, further enhancing security and reducing the risk of fraud. 

Gateway payment fundamentals for modern businesses

The reason why gateway payments are such a keystone when it comes to daily business operations is the role they play in securely facilitating online transactions between customers and merchants. More specifically, payment gateways facilitate the encryption of sensitive information like credit card details, ensuring safe data transfers over the internet, thereby building trust and reducing the risk of fraud. Most payment gateways facilitate quick onboarding and offer robust security features, including PCI DSS compliance and advanced fraud protection tools. Gateways offer fast setup, ease of use without a merchant account, and comprehensive security, making them essential for efficient payment processing.

Moreover, by supporting a wide range of payment methods like credit/debit cards and digital wallets, payment gateways enhance convenience and expand the customer reach that businesses enjoy. Payment gateways facilitate a seamless payment experience, which can reduce cart abandonment and improve customer satisfaction. This crucial technology also enables quick and reliable payment processing (a vital feature for maintaining cash flow), as well as improves financial management and operational efficiency by seamlessly integrating with different accounting systems. By analyzing transaction data, businesses can identify trends and optimize their payment processing strategies.

What’s the difference between payment processor and payment gateway?

The short answer: a payment processor is a company that handles transactions between customer and merchant banks, while a payment gateway is a technology designed to transmit payment information from customers to payment processors.

The slightly longer answer:

• A payment processor handles the transaction between the customer’s bank and the merchant’s bank, ensuring the payment is completed. It facilitates the authorisation, processing, and settlement of credit card or debit card transactions.
• A payment gateway is a technology for securely transmitting payment information from customers to payment processors. As an intermediary between the merchant’s website and the payment processor, it encrypts sensitive data to ensure secure transactions. It is important to understand the terms used in legal, regulatory, and official documentation related to payment gateways, as terminology can impact compliance and service agreements.

In other words, payment processors manage the actual transaction and the transfer of funds, while payment gateways provide a secure interface for the transaction to take place in the first place.

Payment gateways types

There are three main types of payment gateways: on-site payments, redirects, and checkout on-site with payment off-site.

Given the needs of different types of transaction, payment gateways don’t simply act in the same way regardless of context.

Hosted gateways, provided by third-party services, are used for off-site payments, where customers are redirected to the payment service provider’s platform to enter their payment details and complete the transaction. The checkout process ends off-site, and afterwards, customers are sent back to the business website. Hosted gateways are easy to integrate and secure, but don’t allow businesses to retain control of the customer experience.

Self-hosted gateways, as the name suggests, enable businesses to collect transaction data on their own websites, allowing customers to complete transactions without leaving the merchant’s site. This provides a seamless checkout experience and is ideal for larger businesses seeking full control over the checkout process and customer experience. However, when the gateway is self-hosted, the companies using them are required to comply with data protection standards like the PCI DSS, and bear the responsibility for ensuring security measures are in place, which can make a dent in their bottom lines.

API-hosted gateways collect payment details via an API, and provide businesses with a seamlessly integrated and simple checkout process. Just like with self-hosted gateways, these require the merchant to take responsibility for PCI compliance and security, ensuring a secure cardholder data environment.

Checkout on-site with payment off-site means that the front-end checkout occurs on the merchant’s site, but the payment processing is handled by a separate back-end system. This allows customers to enter their details on the merchant’s site before the payment is processed externally, balancing user experience and security.

Local bank integration is a great option for companies targeting specific regions and countries, as they connect directly with the bank’s proprietary payment system. This is an advantage in cases where the bank is widely known and trusted by customers. The main challenge with this type of gateway is the varying technological infrastructures of different banks and their bandwidth for online transactions.

Payment gateway fees and transparent pricing: what does a payment gateway cost?

When businesses need a payment gateway, understanding the full cost structure is essential. Payment gateway fees typically include several components:

Transaction fees – the most common fee type, charged as a percentage of each transaction value plus a fixed amount per transaction (for example, 1.5% + €0.20). The exact rate varies by payment gateway provider, payment method, and whether the transaction is domestic or international.

Monthly or annual access fees – some payment gateways charge a recurring fee for platform access and maintenance, separate from per-transaction charges.

Setup fees – one-time fees to onboard and configure the payment gateway, though many modern providers have eliminated these. However, a long or complex setup process can negatively impact businesses seeking quick deployment and may delay the ability to start accepting payments.

Chargeback and refund fees – when a customer disputes a transaction or requests a refund, some payment gateways charge an administrative fee to process it.

Currency conversion fees – for international transactions, payment gateways often impose additional fees for handling currency conversion, typically as a percentage of the transaction value plus a fixed per-transaction charge.

When evaluating the total cost of a payment gateway, businesses should look beyond the headline transaction rate and account for all applicable fees — particularly if processing significant volumes of international or multi-currency payments.

How do payment gateways work?

Probably the easiest and clearest way to explain this is to simply break down the entire transaction cycle, going step-by-step. Here’s how it goes:

1. Customer initiates purchase by selecting products/services and proceeds to checkout.
2. Customer is prompted to enter their payment details on the gateway’s site.
3. Payment gateway encrypts the payment information to ensure security.
4. Gateway routes the encrypted data through the payment processor to the relevant banks.
5. Payment processor forwards the transaction details to the customer’s bank.
6. Customer’s bank checks for funds and fraud, and approves/declines the transaction.
7. Customer’s bank sends the response to the processor, who forwards it to the gateway. The payment gateway then displays the transaction status (approved or declined) to the customer.
8. If approved, the transaction is successful and the merchant and customer are notified. The funds are placed on hold.
9. Customer’s bank transfers the funds to the merchant’s bank, completing the transaction.

If the payment process is slow or confusing, customers may fail to complete their payment.

Why businesses need a payment gateway

Any business accepting online payments needs a payment gateway. To accept credit card payments securely online, businesses rely on a payment gateway to verify and process credit card information. But beyond the basic function of enabling transactions, a well-chosen payment gateway delivers several advantages that directly affect business performance.

Security and fraud protection

Payment gateways encrypt customer payment information using SSL technology and replace sensitive card details with tokens — meaning real card data is never exposed during transmission. Modern payment gateways also use AI and machine learning for advanced fraud prevention, analysing transaction patterns in real time to detect and block suspicious activity. Fraud detection tools such as Address Verification Systems (AVS) and Card Verification Value (CVV) checks further reduce the risk of unauthorised transactions.

Support for multiple payment methods

A payment gateway supports multiple payment methods — credit and debit cards, digital wallets, bank transfers, and in some cases UPI and local payment methods. This is essential for businesses that serve diverse customer bases or operate across multiple markets, where payment preferences vary significantly.

Recurring payment capability

Payment gateways can store encrypted payment data for recurring payments and subscription billing. This makes them essential infrastructure for SaaS businesses, subscription platforms, and any company that needs to charge customers automatically at regular intervals.

Multi-currency and international payments

Many payment gateways support multiple currencies and allow merchants to accept payments from international customers. For businesses operating in payment gateway in ecommerce contexts across multiple countries, this is a fundamental requirement — customers expect to pay in their local currency, and a payment gateway that supports this reduces checkout friction and cart abandonment.

Integration with business systems

Payment gateways integrate with e-commerce platforms, accounting systems, and ERPs through APIs, enabling automated reconciliation and financial reporting. A payment gateway with clean, well-documented APIs reduces integration complexity and speeds up deployment.

Implementing gateway payments in your business

When choosing a payment gateway for your business, make sure it supports the payment methods favoured by your customers, and smoothly integrates with your current tech systems. Also, make sure you thoroughly understand the fee structure, and only consider gateways that offer strong security measures and flexibility in managing your merchant account (including multi-currency support).

What makes ConnectPay in particular so great is that it supports a wide range of currencies and payment methods, as well as offers transparent fees, and advanced security.

In addition to having a great track record for reliability and excellent customer service, ConnectPay is also super easy to integrate via API with all the major e-commerce platforms. Here’s what the entire process entails:

1. Register for a ConnectPay account.
2. Access the API documentation from the ConnectPay dashboard.
3. For supported platforms, install the ConnectPay plugin.
4. For custom sites, integrate using provided API keys.
5. Configure payment settings in your system.
6. Test transactions in sandbox mode.
7. Switch to live mode and start processing payments.

Quick and easy!

Security protocols and compliance in gateway payments

For security, gateways use encryption to secure data during transmission, as well as fraud-detection measures to identify and prevent suspicious activities, tokenization (replacing sensitive card information with a unique identifier), and 3D secure authentication to shield online transactions with an extra layer of protection. Furthermore, payment gateways are required to comply with standards like the PCI DSS, and conduct regular audits and updates to keep up with any newly emerging threats.

For our part, in addition to all of the above features, we offer embedded compliance. This means that our trusted team of experts handle AML/KYC requirements, as well as compliance with regulations like the GDPR on behalf of our clients. Which is to say, with ConnectPay, regulatory compliance is part of the package!

Payment gateway fraud: Protect your business

Unauthorised transactions via a payment gateway can occur through various means such as stolen card card information, identity theft, phishing, or hacking by fraudsters exploiting vulnerabilities in the payment process. 

Since a payment gateway is an intermediary that connects the merchant and its customers, before they can succeed, fraudsters must find a way to circumvent the fraud-detection measures used by the relevant gateway – this is why prioritising security is so important.

Common payment gateway fraud examples

Here are the most common forms of payment gateway fraud:

• Card-not-Present (CNP) fraud: Unauthorised transactions made using stolen card details online or via phone.
• Phishing: Tricking customers into revealing sensitive information through fake websites or emails.
• Identity theft: Using stolen personal information to make fraudulent transactions.
• Chargeback fraud: Falsely claiming a legitimate transaction as unauthorised to get a refund.
• Account takeover: Gaining access to and misusing a customer’s payment account.
• Transaction laundering: Processing the transactions of an illegal business through a legitimate merchant account.
• Friendly fraud: Disputing a charge imposed by a merchant that the customer initially approved.
• Skimming: Stealing card information through devices attached to card readers.
• Refund fraud: Making purchases with stolen cards and then requesting refunds to a different account.
• Merchant fraud: Charging customers without delivering goods/services.

Because of that, safeguarding your card details is crucial. Please review our fraud prevention guide here: https://connectpay.com/The-Fraud-Memo.pdf.  

The importance of a gateway for SaaS and subscription companies

Recurring payments involve automatically charging customers at regular intervals, requiring secure storage of payment details, accurate billing, and handling of expirations or changes in payment methods.

With payment gateways, you can easily make and collect recurring payments and manage these complexities through secure storage of payment information, automated billing cycles, and tools facilitating the process of adapting to subscription changes.

Some common challenges (and ConnectPay’s solutions to them):

• Payment failures: ConnectPay offers retry logic and alerts for failed payments.
• Security: Advanced encryption and PCI DSS compliance ensure data protection.
• Customer management: Easy subscription management and update tools.
• Compliance: Ensures adherence to regulatory requirements for recurring billing.

The importance of a gateway for platforms and marketplaces

Since platform and marketplace payments involve multiple parties, complex fee structures, and split payments, managing these requires handling many different currencies, compliance issues, and security concerns.

Picking the right gateway will enable your business to automate split payment, conduct multi-currency transactions, and ensure regulatory compliance with ease.

Some common challenges (and ConnectPay’s solutions to them):

• Split payments: ConnectPay automates payments split among several parties.
• Multi-currency transactions: Supports a wide range of currencies.
• Compliance: Ensures PCI DSS compliance and uses advanced encryption.
• Fee management: Transparently manages complex fee structures and payouts.

Addressing the challenges of gateway payments

Just like everything else, payment gateways aren’t perfect, and issues do arise from time to time. Here’s a short list of the most common ones (including solutions) and how ConnectPay deals with them:

Interested in ConnectPay’s payment gateway solutions?

ConnectPay is an all-in-one financial platform designed with online businesses in mind. We offer multi-currency and cross-border payment solutions, built-in regulatory compliance, 24/7 support, a wide range of payment cards (including virtual and white-label), hassle-free embedding of service via an API – and more.

Needless to say, we’re also here to help you with integrating gateway payments and provide any other type of assistance your business may need. If you’re interested, don’t hesitate to drop us a line and we’ll get back to you as soon as possible!

FAQs: Payment gateways