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How to prevent and handle payment fraud

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Payment fraud hits online stores constantly: through stolen credit cards, chargebacks, and account takeovers. The damage goes beyond the lost sale. A chargeback costs you the product, the money, and a processing fee, and too many chargebacks can shut down your ability to accept payments altogether.

This article covers the types of fraud that hit online stores, how to recognize and prevent each one, and how to respond when fraud happens.

Payment fraud is not a matter of if, but when. Most online stores experience attempted fraud within their first year. The good news: you can reduce your fraud risk dramatically through verification, monitoring, and smart policies.

The three most common types of payment fraud targeting online stores

Chargebacks

A chargeback happens when a customer claims they did not authorize a transaction and requests their credit card company or bank to reverse the charge. The customer gets their money back, you lose the product and the payment, and you pay a chargeback fee (typically $15-$100). A handful of chargebacks is normal in e-commerce, but too many (usually 1% of your transaction volume or more) can result in payment processors terminating your account.

Chargebacks fall into two categories: legitimate chargebacks (the customer's account was truly hacked or the product never arrived) and fraudulent chargebacks (the customer received the product but falsely claims they did not). You cannot prevent all chargebacks, but you can defend against false ones by keeping clear records of shipment, delivery confirmation, and customer communication.

Stolen card transactions

A criminal uses a stolen credit card number to make a purchase from your store. They may buy in bulk or make multiple small orders to avoid detection. The cardholder eventually notices unauthorized charges on their statement, initiates a chargeback, and you are left holding the loss. Your chargeback rate spikes, and if chargebacks exceed 1% of your monthly volume, your payment processor can revoke your account.

Account takeover and friendly fraud

A criminal gains access to a legitimate customer's account (through phishing, password reuse, or data breaches) and uses their stored payment information to make unauthorized purchases. The customer notices the charge, claims they did not authorize it, initiates a chargeback, and you lose money twice: once to the fraudster and again through the chargeback fee. This is sometimes called "friendly fraud" because the transaction looks legitimate at first.

How to identify fraud before it costs you

Watch for high-risk order patterns

Certain patterns signal a high likelihood of fraud. Orders that combine several of these red flags are worth investigating before you ship:

Large quantity or high-value orders from a new customer with no order history
Billing address and shipping address in different countries
Multiple orders with the same credit card but different customer names
Orders placed at unusual hours (outside your typical traffic time)
Rush shipping requests with overnight or express delivery
Completely different shipping and billing addresses (address mismatch)
Multiple orders to the same shipping address in a short time span
Invalid or mismatched customer details (name format, email inconsistencies)

No single flag means an order is definitely fraudulent, but a combination of them justifies a pause. Contact the customer to verify the order before processing it. Legitimate customers will confirm. Fraudsters often abandon orders when asked to verify.

Monitor for sudden spikes in chargebacks

Your payment processor sends you notification each time you receive a chargeback. Track these regularly. A sudden spike in chargebacks (even just 3-5 within a week) can signal that your store has been targeted or that your account credentials have been compromised. Investigate the orders associated with chargebacks to identify patterns: are they all the same product? Same geographic region? Same payment method? Understanding the pattern helps you block similar fraud before it happens again.

Fraud prevention tools and verification methods

Address Verification System (AVS)

AVS checks whether the billing address the customer entered matches the address on file with their credit card company. Most payment processors run AVS automatically on every transaction. An address mismatch does not always mean fraud (people move, use PO boxes, or enter addresses inconsistently), but it is a signal to investigate. If you receive many orders with AVS mismatches, you can decline transactions that fail this check, though this also declines some legitimate customers.

CVV verification

The CVV (Card Verification Value) is the three- or four-digit security code on the back of a credit card. Requiring customers to enter their CVV during checkout proves they have the physical card in hand (or a photo of it) and reduces the risk of fraud from stolen card numbers alone. All major payment processors require CVV verification as standard practice.

3D Secure (3DS) authentication

3D Secure adds an extra step to the checkout process: after entering payment information, customers are redirected to their bank to verify their identity (usually through a password or one-time code). This reduces your store's fraud liability and chargebacks by shifting responsibility to the cardholder's bank. Many payment processors now use 3DS by default for certain transactions or geographic regions. Even if it adds a few seconds to checkout, the fraud protection is worth the minor friction.

Fraud detection services

Many fraud detection services use machine learning to analyze transaction patterns and flag suspicious orders in real time. These services cost money (typically $500-$2,000+ per month for a growing store), but if you receive hundreds of orders monthly, the cost of chargebacks often exceeds the cost of fraud detection. WEMASY stores have access to basic fraud monitoring through their payment processor, and can integrate additional fraud detection services for extra protection if your store needs it.

Prevention strategies that work

Require phone verification for high-risk orders

Before shipping an order that shows multiple fraud signals (large amount, new customer, address mismatch), contact the customer by phone to confirm the order. Legitimate customers expect this and are happy to confirm. Fraudsters rarely answer, and if they do, they will often admit they do not recognize the order when confronted directly.

Use delivery confirmation and tracking

Always ship with a carrier that provides tracking and delivery confirmation. When a customer initiates a chargeback claiming they never received the product, you can prove delivery by providing the tracking number and delivery signature to your payment processor. This is your strongest defense against chargebacks. Never ship without tracking, even if the customer asks you to.

Keep clear records of communication

If a customer reaches out with questions before or after placing an order, keep those messages. If they later claim they did not authorize the transaction, those messages (where they confirmed their order, asked about sizing, or tracked delivery) prove the transaction was authorized. Document everything in your customer support system.

Set shipping restrictions and limits

You can reduce fraud exposure by limiting how much a new customer can spend on their first order. For example, allow new customers to spend up to $200, but require manual review for orders over that threshold. Similarly, restrict shipping to addresses in high-risk regions (countries with known fraud operations) or to addresses that differ significantly from the billing address. These limits slow down legitimate customers slightly, but they also dramatically reduce fraud losses.

What to do when you receive a chargeback

Act immediately

Payment processors usually give you 10-30 days to respond to a chargeback. Start gathering evidence immediately. The first step is to pull the full transaction record: the order details, payment information, billing and shipping addresses, customer email, and any communication with the customer. If the order shipped, get the tracking number and delivery confirmation from your carrier.

Determine if the chargeback is legitimate or false

Read the reason code your processor provides. Common codes include "customer disputes transaction" (vague), "product not received" (physical product), "card not present transaction" (customer claims they never authorized it), or "duplicate transaction" (customer claims they were charged twice). The reason code tells you what the cardholder claimed and shapes how you respond.

Gather evidence

Your payment processor will ask you for proof that the transaction was authorized and the product was delivered. Collect:

Proof of authorization: the original authorization code from the payment processor, confirmation that CVV verification passed, 3DS authentication proof, or copies of customer communication confirming the order
Proof of delivery: shipping and tracking information showing the product was delivered to the address the customer provided, with a signature if available
Proof of customer communication: any emails, messages, or support tickets where the customer confirmed their order or did not dispute it until the chargeback

Submit your chargeback response

Log into your payment processor account and submit your evidence in response to the chargeback. Be clear and specific. Do not just dump files—accompany them with a written explanation of what each piece of evidence proves. For example: "The shipping tracking shows delivery confirmation to the address provided during checkout on [date]." Your processor will send this to the issuing bank for review.

Know when to accept the loss

If the chargeback is legitimate (the customer truly did not receive the product or their account was compromised through no fault of your own), you may not win the dispute. Accept the chargeback fee as a cost of doing business, refund the customer if they are still a valuable relationship, and move on. Fighting a chargeback you will lose wastes time and damages customer relationships. Save your energy for fighting false chargebacks where you have solid evidence.

How WEMASY protects your store

WEMASY's e-commerce system integrates with major payment processors and includes built-in protections: secure payment pages that meet PCI compliance standards, CVV verification on every transaction, and fraud monitoring tools to flag high-risk orders. Your WEMASY store also maintains detailed records of all transactions, customer addresses, and delivery information. These records are everything you need to defend against chargebacks.

For complex fraud scenarios or if your chargeback rate is rising, WEMASY's support team can help you review patterns and recommend additional security measures. See what's included in your plan.