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Software Development October 19, 2023

Payment Integration: A Comprehensive Guide to Payment Gateway

Writen by Dharmesh Patel


As it’s commonly accepted, seamless transactions are the backbone of any online business, demanding both security and user-friendliness. As businesses expand their online presence, understanding the intricacies of payment integration becomes paramount. Enter the world of Payment Gateways – Internet commerce’s silent, efficient facilitators. Whether you’re a startup wandering into e-commerce, a developer intending to consolidate installment arrangements, or simply a curious individual, this comprehensive guide will disentangle the intricacies behind installment joining, giving you the information and certainty to explore the universe of online transactions.

What is a payment gateway?

A payment gateway is an online service help that goes about as a go-between, working with the secure transfer of exchange data between a merchant and the financial institution. Fundamentally, it capabilities as a computerized rendition of a customary retail location terminal.

This instrument empowers organizations to consistently get assets from different sources, for example, credit cards, debit cards, e-wallets, and several other payment methods.  By utilizing a payment gateway, merchants can guarantee that the installment subtleties are communicated safely, cultivating trust among their clients and defending sensitive information.

Payment Gateway vs. Payment Processor

A payment gateway is a help that works with the exchange of data between an installment entry ((like a website, mobile phone, or interactive voice response service) and the bank or front-end processor.

At the point when a client decides to pay online for labor and products, the installment door assumes a pivotal part in guaranteeing that the exchange data is safely shipped off to the significant monetary organization for approval and in this manner repayment.

It goes about as a broker among merchants and banks, scrambling delicate information like credit card numbers to guarantee exchanges are private and secure.

Then again, a payment processor is the foundation that deals with the complex steering interaction of the exchange between the dealer, the giving bank, and the gaining bank.

When the payment gateway moves the exchange data, the payment processor confirms and approves the subtleties prior to moving the assets.

Basically, while the payment gateway can be considered the advanced course for exchanging data, the installment processor does the hard work in the background to finish and settle the monetary exchange.

How Does A Payment Gateway Work?

  • A payment gateway is a crucial element in the e-commerce sector, enabling secure online transactions. Here’s how a payment gateway works:
  • When a customer decides to make a purchase on an e-commerce website or app, they enter their credit/debit card details or use other payment methods on the checkout page.
  • Once the user submits their payment details, the web browser encrypts the data and sends it to the merchant’s web server. The server then forwards this encrypted information to the payment gateway.
  • The payment gateway takes the transaction details and passes them securely to the payment processor. The payment processor is a service that communicates transaction details between the merchant and the card networks/banks.
  • The payment processor sends the transaction data to the card association (like Visa, or MasterCard). Then, the bank that issued the user’s card receives the transaction request and performs various anti-fraud checks to ensure the transaction’s legitimacy.
  • Once the issuing bank verifies the transaction, it sends back an approval or decline message. This response is based on the funds available in the user’s account, the validity of the card, and other checks.
  • The payment gateway receives the response (either approval or denial) and forwards it to the merchant’s website or app. If approved, the sale continues, and if denied, the user is alerted, usually prompting them to provide an alternative payment method.
  • After a successful transaction, the merchant sends all approved transactions to their bank in a batch. The bank then communicates with the respective card networks to settle the funds, which usually involves transferring the transaction amounts from the issuing banks to the merchant’s bank account.
  • Once the funds are settled, the merchant’s bank deposits the amount (minus any associated fees) into the merchant’s bank account. This entire process from the time the customer initiates the payment to when the merchant receives the funds typically takes 1-3 days.

Remember, while this process seems lengthy, it happens within seconds in real-time, ensuring quick and secure online transactions.

Types Of Payment Systems 

There are various types of payment systems that facilitate the transfer of money and transactions between individuals, businesses, and other entities. Here’s an overview of some of the most common types:

1. Hosted Payment Gateways

These gateways redirect the user from an e-commerce website to the gateway’s own page to complete the payment. After the transaction is finished, the customer is redirected back to the e-commerce website.

Advantages: Security concerns are mostly handled by the gateway provider. Easy to integrate.

Examples: PayPal, PayUmoney.

2. Self-Hosted Payment Gateways

These gateways collect payment details from the customers within the e-commerce website itself. However, the data is then sent to the payment gateway’s URL to process the transaction.

Advantages: Offers a seamless user experience as customers don’t leave the merchant’s website.

Examples: Many custom solutions function this way; Magento’s payment system can be set up in this manner.

3. API/Non-hosted Payment Gateways

Here, the payment is processed using APIs or HTTPS queries. This means the merchant has full control over the design and layout of the payment process, offering a completely seamless user experience.

Advantages: Customizable and offers a consistent user experience.

Examples: Stripe Payment, Braintree.

4. Custom Payment Gateways

These are specifically designed and built for a particular merchant or e-commerce platform. They offer the maximum degree of customization regarding functionality, UX, and security protocols.

Advantages: Tailored to specific business needs, which can be beneficial in terms of scalability, security, and offering unique payment solutions.

Disadvantages: Can be more expensive and time-consuming to develop and maintain.

Choosing the right payment gateway depends on various factors including the volume of transactions, desired user experience, geographical focus (some gateways are better suited for certain countries), and budget. Always consider transaction fees, setup costs, security measures, and compatibility with your e-commerce platform when selecting a gateway.

Top 7 Things to Keep in Mind for Payment Gateway Integration

Security and Compliance: Ensure that the gateway adheres to the Payment Card Industry Data Security Standard (PCI DSS) and employs end-to-end encryption to safeguard sensitive data.

Compatibility: Check for compatibility with your existing platforms, e-commerce software, and other technical systems to ensure smooth integration.

Transaction Fees: Understand the cost structure, including setup fees, monthly fees, transaction fees, and any hidden costs that might be associated with the gateway.

Multi-Currency and International Support: If targeting a global audience, choose a gateway that supports multiple currencies and has international payment acceptance capabilities.

User Experience: The gateway should provide a seamless and intuitive UI/UX experience for customers, with minimal redirects and quick transaction processing times.

Customer Support: Opt for gateways with responsive customer support, available 24/7 through multiple channels like chat, email, and phone.

Reporting and Analytics: Ensure the gateway offers comprehensive transaction reporting, analytics tools, and dashboards to monitor and evaluate payment performance.


Having a good system for payments is super important for businesses. A good payment system can make buying things easier and safer for customers. This guide has given a detailed look into how these payment systems work and how to set them up. In short, for businesses selling online, picking the right payment method can lead to happier customers and more sales. We hope this guide helps you make the best choice for your business. If you’re considering building one for your business, consulting a reputable Fintech App Development Company can streamline the process and ensure seamless integration.

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