What is a Payment Gateway?
A payment gateway is the technology service that processes card payment transactions between a merchant and the financial institutions involved. It securely transmits transaction data, handles authorisation requests, and returns the approval or decline to the merchant in real time.
How a Payment Gateway Works
A payment gateway acts as the bridge between your business and the banking network. When a customer makes a card payment — whether online, in-store, or over the telephone — the payment gateway handles the complex process of getting the transaction authorised and settled. Here is what happens behind the scenes:
- Step 1: Data capture — The customer's card details (card number, expiry date, CVV) are collected through a payment form, card terminal, or telephone payment system.
- Step 2: Encryption — The gateway encrypts the card data to protect it during transmission.
- Step 3: Authorisation request — The encrypted data is sent to the acquiring bank (the merchant's bank), which forwards it to the card network (Visa, Mastercard, etc.), which routes it to the issuing bank (the customer's bank).
- Step 4: Approval or decline — The issuing bank checks the account, verifies the card details, runs fraud checks, and returns an approval or decline.
- Step 5: Response — The response travels back through the card network and acquiring bank to the payment gateway, which informs the merchant and customer of the result.
- Step 6: Settlement — For approved transactions, the funds are transferred from the issuing bank to the merchant's account, typically within 1-3 business days.
This entire process usually takes just two to three seconds.
Payment Gateway vs Payment Processor
These terms are often used interchangeably, but they serve slightly different functions:
- A payment gateway is the front-end technology that captures and transmits card data securely.
- A payment processor handles the actual movement of funds between banks and manages the settlement process.
Many providers offer both gateway and processing services as a combined solution, which is why the distinction can be confusing. Some businesses use a separate gateway and processor, whilst others use an all-in-one provider.
Types of Payment Gateway
Hosted payment gateways
The customer is redirected to a payment page hosted by the gateway provider. This removes card data from your systems entirely and simplifies PCI DSS compliance. Pay-by-link solutions typically use this model.
API-integrated gateways
The payment form is embedded within your own website or application via an API. This gives you more control over the customer experience but requires stronger PCI compliance measures.
Virtual terminal gateways
A web-based interface that allows your staff to manually key in card details for telephone or mail order payments. The virtual terminal is hosted by the gateway provider.
Choosing a Payment Gateway
When selecting a payment gateway, businesses should consider:
- Supported card brands and payment methods
- Transaction fees and pricing structure
- Integration options (API, hosted page, virtual terminal)
- PCI DSS compliance level
- Fraud prevention tools
- Settlement times and currency support
- Compatibility with your existing systems
Paytia integrates with a wide range of leading payment gateways, allowing your business to continue using your existing payment provider when you add Paytia's secure telephone payment solution. Whether you process through Stripe, Worldpay, Opayo, Adyen, or another major gateway, Paytia connects seamlessly.
When a customer makes a telephone payment through Paytia, the card data captured via DTMF suppression is transmitted directly to your chosen payment gateway for authorisation and settlement. Your contact centre agents never see the card details, and your systems never handle the sensitive data — it flows securely from the caller's keypad to the gateway.
This gateway-agnostic approach means you do not need to change your payment infrastructure to use Paytia. You keep your existing gateway, your existing merchant account, and your existing settlement arrangements, whilst adding a fully PCI DSS Level 1 compliant telephone payment channel.
Frequently Asked Questions
Does Paytia work with my existing payment gateway?
Paytia integrates with a wide range of leading payment gateways including Stripe, Worldpay, Opayo, Adyen, and many more. You can continue using your current gateway when you add Paytia's telephone payment solution.
What is the difference between a payment gateway and a merchant account?
A payment gateway is the technology that processes the transaction and communicates with the banking network. A merchant account is the bank account where your card payment funds are deposited after settlement. You need both to accept card payments.
Do I need to be PCI compliant to use a payment gateway?
Yes. Any business that accepts card payments must comply with PCI DSS, regardless of which gateway they use. However, using a hosted gateway or a service like Paytia can significantly reduce your compliance scope.
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