What is payment security? What you need to know about PCI DSS and fraud

Key takeaways

• Payment security protects your customers' financial data and your business from fraud, chargebacks, and regulatory penalties.

• Strong security measures like encryption, tokenization, PCI DSS compliance, and fraud detection build trust and directly improve checkout conversion.

• Airwallex combines PCI DSS Level 1 certification, AI-powered fraud prevention, and 60+ global licences to help you accept payments securely across 180+ countries.

Customers expect businesses to protect their personal data, especially their financial information. One security breach can cost you customers, revenue, and years of hard-won reputation. In fact, global customers are 56% less likely to use eCommerce payment services after experiencing a fraud-related incident.¹

In this article, we'll look at what payment security actually means, the threats you're protecting against, the standards and measures that matter, and how to build customer trust through secure payments.

What is payment security?

Payment security is the mix of practices, standards, and technologies that protect financial data during and after a transaction. Think of it like the locks, cameras, and alarm systems that protect a physical shop, but for digital transactions. Every time a customer enters their card details or taps their phone to pay, payment security is what keeps that information safe from fraudsters and data thieves.

If your business accepts payments, strong security isn't optional. It protects your customers from fraud, helps shield your business from financial loss and regulatory penalties, and builds the trust that keeps people coming back. Without it, you're leaving the door open to threats that can damage your business overnight.

So, what are those threats exactly?

Common payment security threats

Before you can build a secure payment system, you need to know what you're defending against. Here are the most common threats businesses face today.

Card-not-present fraud

Card-not-present (CNP) fraud happens when someone uses stolen card details to buy something online, where the physical card isn't needed. For eCommerce businesses, this is the biggest risk. A fraudster buys from your site using stolen credentials, the real cardholder disputes the charge, and you're left covering the chargeback cost plus the lost goods. It's a double hit. You lose the product and the revenue.

Phishing, social engineering, and account takeover

Phishing attacks trick employees or customers into giving away payment credentials or login details, often through fake emails that look legitimate. A common example is an invoice email that captures payment details when someone clicks through. Social engineering goes a step further and manipulates people into bypassing security protocols.

Account takeover is where many of these attacks end up. Fraudsters use stolen credentials, often from data breaches elsewhere, to get into customer accounts on your platform. Once they're in, they can make purchases, change delivery addresses, or drain stored payment methods. Multi-factor authentication is one of the strongest defences here.

Data breaches

Data breaches happen when attackers exploit weaknesses in your systems to get access to stored payment data. The damage goes beyond the immediate theft: regulatory fines, chargeback liability, and, most damaging of all, the loss of customer trust. Remember that 56% stat from the intro? Customers don't forget when their data is compromised. A breach can take years to recover from, if you recover at all.

Key payment security measures and standards

Now that you know what you're protecting against, here's how you protect against it. These are the main measures and standards that keep payment data safe.

Encryption

Encryption scrambles sensitive data, like card numbers and personal details, so it can only be read with a specific key. Think of it like sending a letter in a locked box where only the recipient has the key. Even if someone intercepts the box, they can't open it.

Payment providers use encryption at rest and in transit, both when data is stored and when it's being sent. So even if bad actors get access to encrypted data, they can't decrypt it, read it, or use it. For your customers, it's protection working quietly in the background every time they pay.

Tokenization

Tokenization replaces sensitive data, like a credit card number, with a non-sensitive placeholder called a token. A simple way to think about it is a coat check. You hand over your coat, the card number, and get a ticket, the token. That ticket is useless to a thief. They can't wear it or sell it. But you can still use it to get your coat back.

When payment information is tokenised, the original data is stored securely in a vault, and only the token is used in transactions. Even if a cybercriminal intercepts the token, they can't use it to make fraudulent purchases because the original card number stays inaccessible. For merchants, tokenization also reduces your PCI compliance scope. You're not storing raw card data, so there's less to protect.

PCI DSS compliance

PCI DSS (Payment Card Industry Data Security Standard) is the global security standard that any business handling card payments must follow. It isn't optional. If you accept card payments, you need to comply.

PCI DSS covers everything from how you store and transmit cardholder data to how you manage access controls and monitor your systems. There are four compliance levels, based on how many card transactions you process each year:

• Level 1: Over six million transactions per year. Requires an annual on-site audit by a Qualified Security Assessor.

• Level 2: 1–6 million transactions. Requires an annual self-assessment questionnaire and quarterly network scans.

• Level 3: 20,000–1 million eCommerce transactions. Similar requirements to Level 2.

• Level 4: Fewer than 20,000 eCommerce transactions or up to one million total transactions. Self-assessment questionnaire required.

Here's the practical upside: if you use a PCI DSS Level 1 certified payment provider, like Airwallex, your own compliance burden is significantly lower. The provider does the heavy lifting to secure card data, so you don't have to build and maintain that setup yourself.

Strong Customer Authentication and 3D Secure

Strong Customer Authentication (SCA) is a regulatory requirement under the EU's Payment Services Directive 2 (PSD2). It says that online payments must use at least two of three authentication factors: something you know, like a password, something you have, like your phone, and something you are, like a fingerprint.

3D Secure is one of the main technical protocols used to support SCA. For many transactions, 3D Secure works invisibly in the background, in what's called a frictionless flow. For higher-risk transactions, it's the pop-up or redirect that asks you to verify a payment through your banking app, a one-time code, biometrics, or other methods. While SCA applies specifically to European transactions, 3D Secure is used globally as an extra layer of fraud protection.

The hard part is balancing security with friction. If you challenge too many payments, customers abandon their carts. Airwallex's 3D Secure logic analyses transaction risk in real time and only triggers authentication when it's needed. Low-risk transactions go straight through. High-risk ones get an extra check. You can learn more about two-factor authentication in our help centre.

Hosted vs. embedded checkout

The way you set up checkout changes your security responsibilities. With a hosted checkout, customers are redirected to your payment provider's page to enter their card details. You never handle the raw card data, which significantly reduces your PCI compliance scope. It's a bit like having a security company run your cash register for you. They take on the risk.

With an embedded checkout, customers stay on your site throughout the payment process, which can feel more seamless. But it also means you're handling more of the security yourself, even if the payment provider's tools are doing much of the heavy lifting behind the scenes. It's more like running the register yourself with their security equipment.

Airwallex offers both checkout options, so you can choose the setup that fits your business and technical capabilities.

Digital wallet payment security

Digital wallets like Apple Pay and Google Pay come with built-in security layers that help both you and your customers. When someone pays with a digital wallet, the transaction uses tokenization, so their real card number is never shared, plus biometric authentication, like a fingerprint or face recognition, to verify the payment.

For merchants, that means you never handle raw card data, which lowers your fraud risk and PCI scope. For customers, it means a faster, more secure checkout experience. Accepting digital wallets is also a visible trust signal. Customers recognise these brands and connect them with security. Airwallex supports Apple Pay, Google Pay, and other major digital wallets.

Securing cross-border payments

If you're selling to customers in more than one country, your payment security needs go beyond a single set of regulations. Cross-border payments add more complexity, and more risk if you're not ready for it.

Multi-market regulations and local acquiring

Different markets have different regulatory requirements. GDPR governs data protection across the EU. PSD2 and SCA apply to European transactions. Markets in Asia-Pacific often have local data residency laws that require customer data to stay within the country. Managing all of that yourself is a full-time job, and if you get it wrong, you could face fines, blocked transactions, or worse.

A global payment provider takes that complexity off your plate. Airwallex holds 60+ licences and permits from financial regulators around the world, including the Financial Conduct Authority (FCA) in the UK, the Australian Securities and Investments Commission (ASIC), and the Financial Crimes Enforcement Network (FinCEN) in the US. When you partner with us, you're covered across markets without having to become a compliance expert yourself.

There's another cross-border factor to think about: local acquiring. When you process a payment through a local entity in the customer's country, instead of routing it internationally, authorisation rates improve and legitimate transactions are less likely to be flagged as fraud. Foreign transactions look riskier to card networks, so they get declined more often. Airwallex offers local acquiring in 35+ markets, helping you capture more revenue whilst reducing fraud risk.

Of course, security measures only matter if your customers can see and feel them. So let's look at how to turn all of this into trust at the point of purchase.

How to build customer trust through payment security

When customers feel secure, they're more likely to complete purchases, spend more, and come back. Here's how to make your security visible and build trust where it matters most.

Build trust at checkout

Your checkout page is where trust is won or lost. Customers are handing over their financial details, so they need to feel sure it's safe. Display security signals clearly:

• SSL padlock: The padlock icon in the browser bar shows the connection is encrypted.

• Payment method logos: Visa, Mastercard, Amex — familiar logos signal legitimacy.

• Security badges: Verified by Visa, Mastercard SecureCode, and Norton or McAfee seals near the payment form.

• Digital wallet icons: Apple Pay and Google Pay logos signal modern, secure payment options.

• Local payment methods: Showing options like Venmo in the US or PayNow in Singapore tells customers you understand their market.

Supporting multiple payment methods isn't just about convenience. Every familiar option is also a trust signal. Airwallex supports 160+ local payment methods across 180+ countries, so your customers can pay the way they prefer.

Confirm transactions and resolve issues quickly

Trust doesn't stop at checkout. Send immediate order confirmations after successful payments, a receipt that lists all charges, shipping information, and the payment method used. That reassures customers that the transaction went through properly and gives them a record they can check later.

When issues do come up, responsive customer support makes a huge difference. Show clear refund and return policies on your website so customers know what to expect. Communicate proactively about any delays or problems with orders. Customers who feel informed and supported are much more likely to trust you with future purchases.

How Airwallex protects your payments

All of the security measures we've covered, encryption, tokenization, PCI DSS compliance, 3D Secure, and fraud detection, are built into our platform. Here's how we use them for your business.

AI-powered fraud detection and 24/7 monitoring

We use machine learning models that analyse transaction patterns in real time to spot unusual behaviour before it becomes a problem. Our 3D Secure logic assesses risk on every transaction and only triggers authentication when it's needed, so legitimate customers aren't blocked by unnecessary friction. And when a genuine transaction is declined at first, automatic retry logic gives it another chance through alternative routes.

Our global fraud and security teams work 24/7, 365 days a year. They monitor new threats, update our defences continuously, and stay ahead of the latest developments in cyber security. So you get protection that evolves as quickly as the threats do.

Global compliance and licensing

Airwallex is PCI DSS Level 1 certified, the highest level of compliance, and SOC 1 and SOC 2 compliant. We hold 60+ licences and permits from financial regulators worldwide, including the FCA in the UK, ASIC in Australia, the Hong Kong Customs and Excise Department, and FinCEN in the US.

When you partner with Airwallex, you don't have to work through each market's regulations on your own. We handle compliance so you can focus on growing your business. Our global payment solutions support 160+ local payment methods in 180+ countries, with like-for-like settlements in multiple currencies to protect your margins wherever you do business.

Frequently asked questions

What does payment security mean?

Payment security is the set of practices, standards, and technologies used to protect financial data during and after a transaction. It applies to any business that accepts payments, whether online, in-store, or via mobile, and covers everything from encryption and fraud detection to regulatory compliance.

What is PCI DSS and why does it matter?

PCI DSS (Payment Card Industry Data Security Standard) is a set of security requirements that any business handling card payments must follow. Compliance protects customer data, reduces your liability if there's a breach, and is required by card networks. Learn more in our guide to PCI DSS compliance.

How can I reduce payment fraud on my website?

Use a payment provider that offers fraud detection tools like address verification (AVS), CVV checks, and 3D Secure authentication. Display trust signals at checkout, keep your software and plugins updated, and monitor transactions for unusual patterns. A provider with AI-powered fraud detection can catch threats that manual checks miss.

What's the difference between encryption and tokenization?

Encryption scrambles data so it can only be read with a specific key, while tokenization replaces sensitive data with a non-sensitive placeholder, a token. Both protect payment data, but they work at different stages: encryption secures data in transit and at rest, while tokenization protects stored data by making sure the original card number is never exposed.

Sources and references

• https://trust.telesign.com/rs/592-GWW-584/images/Report-TelesignTrustIndex-en-6.pdf?version=0