Published Oct 20, 2025 4 Min Read

Understanding Payment Gateway

 
 

In today’s digital economy, seamless and secure online payments are essential for any business. Whether you're running an e-commerce store or offering digital services, a payment gateway plays a crucial role in enabling transactions. This article explains what a payment gateway is, how it functions, the different types available, and how it compares to other payment solutions. Check your business loan eligibility to ensure your business is financially prepared to integrate such technologies.

What is a payment gateway?

A payment gateway is a technology that enables merchants to accept payments from customers through various digital methods such as credit/debit cards, UPI, net banking, and mobile wallets. It acts as a bridge between a customer’s bank and the merchant’s bank, ensuring that the payment process is smooth, secure, and efficient.

How does a payment gateway work?

Here’s how a typical payment gateway functions step by step:

  • Step 1: The customer selects products/services and proceeds to checkout.
  • Step 2: The payment gateway encrypts and transmits the customer’s payment data to the acquiring bank.
  • Step 3: The acquiring bank routes the request to the payment processor.
  • Step 4: The payment processor communicates with the customer’s issuing bank to approve or decline the transaction.
  • Step 5: The response is sent back through the gateway, and the transaction is either approved or declined.
  • Step 6: If approved, funds are transferred to the merchant’s account.

Types of payment gateways

There are several types of payment gateways used by businesses in India:

  • Hosted payment gateway: Redirects customers to the payment service provider’s page.
  • Self-hosted payment gateway: Payment details are collected on the merchant’s site and then sent to the gateway for processing.
  • API/Integrated gateway: Provides full control over the checkout process, ideal for larger businesses with development resources.
  • Mobile payment gateway: Optimised for mobile apps and supports UPI and wallet payments.

Benefits of using a payment gateway for your business

Implementing a payment gateway offers multiple benefits:

  • Secure transactions: Uses encryption and compliance protocols like PCI DSS.
  • Faster payment processing: Instant confirmations and quicker settlements.
  • 24/7 availability: Enables customers to pay at any time, improving sales.
  • Supports multiple payment methods: Credit/debit cards, UPI, wallets, net banking.
  • Reduces cart abandonment: A seamless checkout experience leads to better conversions.

Check your pre-approved business loan offer to explore options for expanding your payment infrastructure.

What does a payment gateway do?

A payment gateway performs several vital tasks to ensure smooth payment processing:

  • Data encryption: Secures sensitive payment information during transmission.
  • Authorisation: Validates the customer’s payment details with their bank.
  • Fraud detection: Detects and prevents suspicious transactions.
  • Transaction settlement: Ensures funds are moved to the merchant's account after approval.
  • Reporting and analytics: Offers dashboards for tracking transactions and performance.

Difference between payment gateway and payment terminal

FeaturePayment gatewayPayment terminal
UsageOnline payments (web/app)In-person payments (POS machines)
ConnectivityInternet-basedInternet or card reader-based
Payment methodsCards, UPI, wallets, net bankingCards (swipe, tap), sometimes QR codes
Physical presence neededNoYes
Ideal forE-commerce and digital servicesPhysical retail stores

Difference between a payment gateway and a payment processor

While both are part of the payment ecosystem, their roles differ:

  • Payment gateway acts as the communication channel between the merchant and banks. It handles data encryption and secure transmission of payment information.
  • Payment processor is responsible for carrying out the actual transaction by communicating with banks and card networks to approve or decline the payment.
  • Think of the gateway as the “interface” and the processor as the “engine” that makes the transaction happen.

Conclusion

A payment gateway is essential for any business that wants to accept digital payments securely and efficiently. From enhancing customer trust to enabling faster transactions, it plays a crucial role in business growth. For companies that need immediate access to capital for setting up or upgrading payment systems, a business loan can be a smart financing option.

Frequently Asked Questions

Can I use a single payment gateway for both my website and physical store?

Yes, many modern payment gateways support omnichannel payments, enabling businesses to collect payments through both online and offline modes seamlessly. For example, the same gateway can be integrated into your website for online payments and connected to a POS terminal for your physical store.

What is MDR (Merchant Discount Rate) in a payment gateway?

MDR stands for Merchant Discount Rate, the percentage of the transaction amount charged by the payment service provider to the merchant to process a payment. It typically covers services like payment processing, transaction security, and payment settlement services.

How does a payment gateway handle failed transactions and refunds?

Payment gateways immediately notify merchants and customers of a failed transaction. Often, they provide detailed error codes that indicate the issue (e.g., insufficient funds, incorrect card details). For refunds, the amount is processed and credited back to the customer’s original payment method within a specified timeline, based on the gateway provider’s policies.

Can a payment gateway accept international payments in foreign currencies?

Yes, most payment gateways support international transactions, enabling businesses to accept payments in multiple currencies. The gateway handles the currency conversion and ensures secure fund transfers across borders. However, there may be additional charges for cross-border transactions.

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