What is a payment service provider? How PSPs work, key features, and how to choose one

Key takeaways

• A payment service provider (PSP) handles the full payment chain, from checkout to settlement, so businesses don't need separate relationships with banks, processors, and card networks.

• When choosing a PSP, prioritise multi-currency support, transparent pricing, flexible integrations, and strong security and compliance credentials.

• Airwallex lets you accept 160+ payment methods across 180+ countries, with like-for-like settlement in multi-currency Business Accounts, so you can avoid forced currency conversions and unnecessary FX fees.

A payment service provider (PSP) is a company that manages digital payments for businesses. It connects you to banks, card networks, and payment methods through one integration. You can think of a PSP as a single layer between your business and the complex network of banks, card networks, and payment methods—so you don't have to connect everything yourself.

The main benefit is simple: you can accept credit cards, digital wallets, bank transfers, and local payment methods without setting up separate relationships with each provider.

By 2026, over 5.2 billion customers are expected to use digital wallets¹. Having a PSP can help your business reach more people by accepting payments in more currencies, at home and abroad. PSPs often include both payment gateways and payment processing.

Keep reading to learn how PSPs work and how to choose the right one for your business.

PSP vs. payment gateway vs. payment processor

People often use these terms as if they mean the same thing. However, they actually refer to different parts of the payment chain. Understanding the difference will help you work out what you really need, and whether a PSP covers everything in one place.

PSP = gateway + processor + merchant account + fraud tools, all in one. Instead of connecting separate providers, a PSP gives you the full stack through one integration.

What's a payment gateway?

A payment gateway is the front door of a payment. It's the technology that collects and encrypts payment details at checkout. Think of it like a card reader at a shop till, but for online payments. It protects sensitive data, so you don't need to build that system yourself. The gateway then sends the encrypted data to the processor, but it doesn't move money or talk to banks directly.

What's a payment processor?

A payment processor is the behind-the-scenes engine that moves transaction data between the merchant's bank and the customer's bank. Think of it like a postal sorting office that sends your letter to the right place. The processor sends authorisation requests, checks if there are enough funds, and helps with settlement—all without you needing direct relationships with each bank involved.

How do PSPs differ from banks?

Banks hold and move money. PSPs sit on top of banking systems and connect merchants to many payment methods and banks through one integration.

Here's the key difference: when you use a PSP, you're usually using an aggregate merchant account model. That means the PSP groups many merchants under its own merchant account, instead of each business getting its own merchant account with an acquiring bank.

Benefits of the aggregate model:

• Faster onboarding (days instead of weeks or months)

• Simplified compliance—the PSP handles much of the regulatory work

• Lower barriers to entry for smaller businesses

Trade-offs to consider:

• Less control over dispute resolution processes

• Potential transaction volume limits

• Shared risk profile with other merchants

PSPs aren't banks, but they work with banking partners and hold the licences required to operate. Very large enterprises with complex needs may still prefer dedicated merchant accounts for greater control, but most growing businesses benefit from the aggregate model's speed and simplicity.

How payment service providers work

Each payment involves a few key players working together: the merchant (your business), the PSP, the acquiring bank (which processes payments for merchants), the card network (Visa, Mastercard, and others), and the issuing bank (the customer's bank).

You can think of the PSP as the conductor of an orchestra. It coordinates each player so the payment goes through smoothly. The PSP connects to the payment gateway, processor, and acquiring bank for you, so you don't have to manage those relationships on your own.

What PSPs replaced (and why it matters)

Before PSPs, businesses had to work directly with banks and card companies. They also had to handle security and compliance themselves. And because payments and fraud tools were separate, businesses often needed more people to manage different vendors and integrations.

PSPs group together what used to need separate integrations—such as processors, gateways, and fraud tools—into one platform. This makes PSPs quicker to set up and easier to manage. It also tends to be more cost-effective, especially for growing businesses.

The five steps of a PSP transaction

1. Customer picks a payment method. The customer picks a payment method and enters their payment details, online or in person.

2. Gateway encrypts and transmits. The payment gateway encrypts the payment details and sends them to the payment processor.

3. Processor requests authorisation. The processor checks the card details and asks the customer's issuing bank to authorise the payment.

4. Authorisation confirmed. If there's enough money and the payment is approved, the merchant gets notified.

5. Funds settle. Finally, the payment processor moves the funds from the customer's bank account to the merchant's account, usually within a few days.

Key features to look for in a payment service provider

If you're selling to customers in more than one country, here's what to look for in a PSP:

Multi-currency support

Your PSP should support payments in many currencies and countries. This makes it easier to take international payments without pushing customers to pay in a currency they don't know.

Example:If you're a UK business selling to customers in Japan, they can pay in yen while you receive pounds—without building separate integrations for Japanese payment methods like Konbini or bank transfers.

Payment method breadth

Look for support for cards, digital wallets, buy now, pay later (BNPL), and local payment methods. The more choice you offer, the fewer customers you'll lose at checkout. Research shows that 9% of online shoppers abandon carts because their preferred payment method isn't available².

Settlement speed and options

PSPs can settle funds at different speeds. Try to choose one with fast settlement and, if possible, like-for-like settlement. That way, you can receive funds in the same currency the customer used.

Without like-for-like settlement, you'll face:

• Unpredictable FX margins (often 2-5% above mid-market rates)

• Exchange rate fluctuations between sale and settlement

• Reduced profit margins on international sales

Ease of integration

Your PSP should offer integration options that fit your website or ecommerce store. These can range from no-code plugins to full API access. This helps cut the time it takes to start taking payments.

Security and compliance

Choose a PSP with strong payment security. It must follow key rules, such as the Payment Card Industry Data Security Standard (PCI DSS), and hold the right licences in the markets where you operate.

Transparent pricing structure

Look for clear pricing with no hidden fees. Before you commit, check transaction fees, FX margins, and any monthly or setup costs.

Reporting and analytics

Strong reports and analytics can show you trends, failed payments, and customer behaviour, so you can make better decisions.

Benefits of using a payment service provider

Using a payment service provider can bring many benefits to your business:

• Simplified setup: Instead of setting up separate relationships with banks, processors, and gateways, you get it through one integration. This saves time and lowers day-to-day complexity.

• Broader payment acceptance: More payment options can help you reach more customers. It also lets local customers pay in their own currency using methods they already trust. With over 5.2 billion customers expected to use digital wallets by 2026¹, that flexibility matters.

• Built-in security: PSPs handle PCI DSS compliance, fraud prevention, and data encryption for you. So, you don't need to build or maintain that setup yourself.

• Lower operational overhead: PSPs often use clearer, lower-cost fee structures. This can help keep your transaction costs down compared with managing many different vendors.

• Consolidated analytics: Many PSPs offer detailed reports. These can show patterns, decline rates, and customer behaviour, so you can make better decisions.

Common trade-offs to consider

Even though PSPs have a lot of benefits, there are a few things to watch for:

• Fees and hidden costs: Beyond transaction fees, some PSPs charge setup fees, monthly fees, or other costs. These can reduce your profit margin. So, always ask for a full cost breakdown before you commit.

• FX conversion exposure: Many PSPs let you take payments in more than one currency. However, you might only be able to withdraw funds in your home currency. For example, if you take euros but your account is in US dollars, the PSP will convert the euros to US dollars when you withdraw. This can lead to conversion fees and exchange rate changes.

• Checkout customisation limitations: A PSP can give you less control over your checkout. Some providers only offer basic changes or fixed checkout steps you can't edit. As a result, the experience can feel less like your brand.

The best PSPs reduce these issues with clear pricing, like-for-like settlement in multi-currency accounts, and flexible integrations that let you shape the customer experience.

When you might not need a PSP

PSPs aren't the right solution for everyone. Consider alternatives if:

You only operate domestically with simple payment needs

If you accept one payment method (e.g., credit cards only) in a single country, a basic payment gateway may be sufficient—and potentially less expensive.

You're a very large enterprise with complex requirements

Businesses processing hundreds of millions annually may benefit from dedicated merchant accounts that provide greater control over processing rules, custom negotiated rates, and direct relationships with acquiring banks.

You have specialised industry requirements

Certain high-risk industries may need PSPs with specific expertise and higher risk tolerance, or may benefit from industry-specialist processors.

You operate primarily offline

If your business is predominantly in-person retail with minimal online sales, a simpler point-of-sale system might be more appropriate.

How to choose the right PSP for your business

The right PSP depends on your business model, your customers, and your growth plans. Here's what to review:

Assess your needs

Different businesses need different PSP features. If you've got international customers, you'll want a PSP that accepts many payment methods and currencies. You'll also want like-for-like settlement, which can help you manage fees and costs.

Check pricing transparency

Look for clear pricing with no hidden fees. Before you commit, check transaction fees, FX margins, and any monthly or setup costs.

Evaluate scalability

Your PSP should be able to grow with you. Check if it can handle more transactions, new markets, and more payment methods as you expand.

Seek integration flexibility

You might want a no-code plugin for your ecommerce platform. Or you might need a fully custom API. Either way, make sure the PSP offers options that fit your technical resources and your checkout goals.

Review settlement options

Faster settlement and the ability to hold funds in more than one currency can help your cash flow and reduce FX risk.

Evaluate customer support

Strong support matters, especially when you face payment issues or technical problems. Look for 24/7 support, more than one contact method, and a track record of fixing issues fast.

PSP comparison: Leading providers

Accept payments globally with Airwallex

Airwallex helps businesses accept 160+ payment methods across 180+ countries, with like-for-like settlement in multi-currency Business Accounts. That means you can receive, hold, and pay out funds in 60+ currencies without forced conversions or hidden FX fees.

Whether you need a no-code plugin for your eCommerce store or full API access for a custom checkout, Airwallex gives you the flexibility to build the payment experience your customers expect.

Ready to simplify your payments? Create an account in minutes and start accepting global payments with transparent pricing and no hidden fees.

Frequently asked questions (FAQ)

What is an example of a payment service provider?

Examples of payment service providers include Airwallex, PayPal, and Stripe. All of them let businesses accept online payments through one integration. Each one has different strengths. Airwallex is built for multi-currency and cross-border payments. PayPal is known for strong brand recognition. And Stripe offers a wide set of developer tools.

What is the difference between a PSP and a payment processor?

A payment processor routes transaction data between banks. A PSP includes the processor, the gateway, and other services in one platform. Most modern PSPs include processing in their product, so you don't need a separate processor contract.

What is a payment service provider in UPI?

In UPI (Unified Payments Interface), a payment service provider is an authorised entity, usually a bank. It builds and runs the app that users use to access UPI services. This is specific to India's payment system. It also differs from the wider global meaning of PSP, which usually means a third-party company that connects merchants to many payment methods.

Do I need a PSP if I already have a bank account?

Yes. A bank account lets you hold and move money. But it doesn't give you the tools to accept online payments across many payment methods and currencies. A PSP connects your business to card networks, digital wallets, and local payment methods that a standard bank account can't support on its own.

Sources and references

1. https://business.bankofamerica.com/resources/benefits-of-digital-payments.html

2. https://developer.paypal.com/braintree/articles/get-started/currencies

3. https://stripe.com/pricing

Disclaimer: We updated this article in Q1 FY26. We based the information on our own online research and couldn't manually test each tool or provider. The information is for educational purposes only, and you should consider your business needs when comparing providers. We review this research every six months. If you'd like to request an update, contact us at [email protected].