Advanced Gateway Fraud Prevention Strategies for 2026

Imagine you want to buy something online, but you can only pay for it with a direct bank transfer, cryptocurrency, or a peer-to-peer payment app you’ve never heard of. You would probably be concerned about fraud and may not even complete the payment. Without payment gateways, online purchases would be much more difficult—and even dangerous—to manage. Payment gateways allow companies to accept credit and debit cards from anyone and have become an essential part of every online transaction.

But payment gateways aren’t without risk. Wherever money flows, there will be fraud, and payment gateways are no exception. This particular type of digital fraud is on the rise, with global online payment fraud losses expected to reach $107 billion by 2029. The financial repercussions for businesses and payment service providers can be severe, including direct monetary losses, chargebacks, and increased compliance costs.

If you want to protect your customers and your brand reputation, it’s important to understand what payment gateway fraud is and how it can be prevented.

In this blog post, we will explore exactly that:

• What is payment gateway fraud?
• What are the consequences of payment gateway fraud?
• How to Detect Gateway Fraud
• How Payment Gateways Can Prevent Fraud
• How to Choose a Secure Payment Gateway

Key takeaways

• The financial stakes are rising: E-commerce companies face escalating risks, with global merchant losses from online payment fraud projected to exceed $100 billion across the next three years.
• Automation is the real enemy: Fraudsters rarely operate manually; they rely on bots and automated scripts to test stolen credentials at scale. Look out for sudden transaction spikes, multiple failed payment attempts, and unusual proxy server usage.
• Basic protocols aren’t enough: While technologies like CVV, 3-D Secure 2.0 (3DS2), and device fingerprinting add necessary friction, they cannot consistently stop sophisticated, automated threats on their own.
• Proactive cyberfraud protection outperforms: The most secure payment gateway is one that bad actors never reach. Implementing a robust bot and agent trust management software stops AI-driven attacks before they hit your infrastructure.

What is payment gateway fraud?

A payment gateway is a software application that securely captures and transmits payment information between the customer, merchant, and payment processor. A payment processor, on the other hand, is responsible for authorizing transactions and handling settlement, working behind the scenes to move funds between the buyer’s and seller’s accounts. While the payment gateway acts as the secure interface for collecting payment data, the payment processor executes the transaction, making it important to understand both components for effective gateway fraud prevention.

Payment gateway fraud is the act of using stolen or fake card details to make illicit online payments. Every business that processes online payments is at risk of gateway fraud. Fraudsters target payment gateways because they’re the entry point for all transaction data. Once a gateway captures and transmits card information to the processor, it’s difficult to stop the transaction unless the fraud is detected immediately. This makes the gateway a prime target for several types of attacks, including card testing, account takeover, and chargeback fraud.

What are the consequences of payment gateway fraud?

Gateway fraud typically manifests as credit card fraud, with unauthorized transactions appearing on legitimate cardholders’ statements. For consumers, this is primarily an inconvenience—consumer protection laws in most countries ensure victims of e-commerce fraud receive full reimbursement from their card issuers.

Businesses face far greater consequences. When chargebacks are filed, merchants must refund the fraudulent purchase while also paying chargeback fees, gateway transaction fees, and fraud penalties—often totaling more than the original transaction value. Beyond direct financial losses, gateway fraud damages brand reputation and trust, particularly when customers associate security failures with the merchant. Companies also face regulatory scrutiny and compliance risks when fraud rates exceed industry thresholds, potentially resulting in higher processing rates or loss of payment processing privileges.

How to detect gateway fraud: 7 signs and red flags

Gateway fraud does not come unannounced. There are a few key indicators that you can watch out for to identify and prevent gateway fraud, such as:

1. Sudden increase in the number of processed transactions

Legitimate traffic grows gradually. A sharp, unexplained spike in transaction volume—especially outside of known sales events or marketing campaigns—often signals automated fraud. Bots can process hundreds of transactions per minute during card testing attacks, creating volume patterns that deviate significantly from your baseline. Monitor for unusual spikes in both successful and declined transactions.

2. Large number of transactions made outside of normal operating hours

If your business typically sees peak activity between 9am and 9pm, but suddenly experiences heavy transaction volume at 3am, that’s a red flag. Fraudsters often operate during off-hours when security teams are less likely to respond immediately. Automated attacks don’t follow human schedules—they run around the clock until stopped.

3. Sudden changes to shipping addresses

When the same payment information is used for multiple orders with different shipping addresses, or when accounts suddenly update their delivery information right before making high-value purchases, it often indicates account takeover or stolen payment credentials. Legitimate customers rarely change shipping addresses repeatedly or immediately before checkout.

4. Multiple failed payment attempts

A few declined transactions are normal. But dozens or hundreds of failed attempts from the same session, IP address, or device signals card testing fraud. Attackers use bots to validate stolen card numbers by making small test purchases, cycling through compromised credentials until they find active cards with available credit.

5. Increase in refunds and chargebacks

Rising chargeback rates—especially when customers claim they never made the purchase—directly indicate fraudulent transactions slipping through. Similarly, refund abuse patterns, such as requests to alternative payment methods or excessive returns from new accounts, suggest coordinated fraud schemes exploiting your gateway.

6. Increase in traffic from VPNs or proxy servers

Fraudsters use VPNs, proxies, and residential IP networks to mask their true location and distribute attacks across multiple IP addresses. While some legitimate users employ privacy tools, a sudden surge in proxy traffic—particularly from data centers or high-risk regions—warrants closer inspection. Advanced attackers rotate IPs constantly to avoid rate limiting and IP-based blocking.

7. Unusual behavior patterns at checkout

Beyond technical signals, pay attention to how users navigate your site. Bots often exhibit inhuman behavior: skipping product pages entirely, moving directly to checkout with precise timing, or submitting forms faster than humans can type. Session analysis that tracks mouse movements, keystroke patterns, and navigation flow can reveal automated activity that traditional security measures miss.

How payment gateways can prevent fraud

Several technologies help drastically reduce the risk of payment gateway fraud, including card verification value (CVV)—the three or four digits on the back of your credit and debit cards. CVV codes are an additional layer of security, because fraudsters often only know (parts of) a credit card number and not the CVV code. The code isn’t foolproof, but it’s more secure than having a payment gateway that does not ask for a CVV code.

3-D Secure 2.0 (3DS2) adds another security layer to prevent payment gateway fraud by requiring the customer to enter a one-time password. Those passwords are often sent to the customer’s mobile phone or their email address, both channels that fraudsters are unlikely to have access to. Still, 3DS2 is not a perfect security layer, and it will cost your business in authentication fees (and degraded UX) without necessarily preventing all gateway fraud.

Device fingerprinting is another fraud prevention technology that tracks a customer’s digital fingerprints to identify the device they’re using to make payments. If the digital fingerprints during payment don’t match up with past sessions, the right online fraud protection software will flag and block the transaction.

Other technologies to prevent payment gateway fraud include:

• IP fraud scoring systems: These assess the risk of fraudulent activities by looking at the IP addresses of users. Unusual IPs will be identified and, depending on how strictly you set up the software, blocked from buying anything.
• Data enrichment: This involves collecting data on customer behavior and cross-referencing it with other databases to check for fraudulent activities. If the cross-referenced information doesn’t match, it’s a potential indicator of fraud.
• Reverse email lookups: This uses software to verify emails used when making transactions, to check if they’re fake or stolen. This is useful because fraudsters don’t use their actual emails to commit fraud. Instead, they use fake or stolen emails.

How to choose a secure payment gateway

When you’re looking for a payment gateway, look for one that’s compliant with PCI DSS. PCI DSS is the industry standard for securing credit card data, and it requires payment gateways to follow strict security protocols. Any gateway you consider should meet these requirements—it’s non-negotiable.

PCI DSS covers the gateway itself, but it doesn’t address the bigger threat: automated attacks that target your payment infrastructure before transactions even reach the gateway.

Stop fraud before it hits your payment gateway

Most gateway fraud happens through bots. Fraudsters use automated scripts to test stolen cards, take over accounts, and submit fraudulent transactions at scale. Traditional gateway security measures like CVV verification and 3DS2 only work after fraud attempts reach your payment flow—when they’ve already consumed infrastructure resources and created friction for legitimate customers.

DataDome blocks fraudulent traffic in under 2 milliseconds, before bots ever reach your payment gateway. Our bot protection platform analyzes behavioral signals across your entire digital infrastructure—websites, mobile apps, and APIs—distinguishing between legitimate customers and automated attacks in real time.

For PayPal, DataDome has helped ensure cleaner traffic reaches core systems and fraud models work better, yielding a measurable reduction in operating costs.

Curious to learn more? Book a demo to see how DataDome can reduce gateway fraud for your business.