Merchants win only about 45% of the chargebacks they formally re-present, and most of the losses come from avoidable process errors rather than weak evidence. The five most common are missing the card network's response window (20 days for Visa, 45 for Mastercard, 10 for PayPal), disorganized documentation, refund policies buried where customers cannot find them, misreading the dispute reason code, and under-investing in fraud prevention. Submitting organized evidence matched to the specific reason code, on time, is the fastest lever to improve representment outcomes.
TL;DR: Merchants who win chargeback representment share four practices: they submit documentation within the card network’s response window (20-45 days for Visa/Mastercard, 10 days for PayPal), match their evidence to the specific reason code, keep transaction records organized and ready, and maintain clear refund policies. Across these disputes, the average merchant wins roughly 45% of cases they formally re-present, but most lose winnable cases to avoidable process errors, not to weak underlying evidence. The five mistakes below are the most common of those errors.
Merchants who formally dispute chargebacks win roughly 45% of the cases they re-present, but most lose winnable disputes to avoidable process errors. The five mistakes below, missing response deadlines, disorganized documentation, buried refund policies, misread reason codes, and under-investment in fraud prevention, are the most common reasons a merchant loses a case that the underlying evidence could have won. Fixing them is the fastest lever a merchant has to improve representment outcomes.
One reason it’s hard to successfully defend against chargebacks is the cumbersome process. Banks, credit card companies and payment platforms each have their own timeframes, procedures and documentation requirements. If merchants aren’t paying attention, it’s easy to make simple but costly mistakes.
Here are five of the most common mistakes merchants make when it comes to disputing chargebacks and tips for not making the same mistake twice.
What is chargeback representment? Representment is the formal process by which a merchant disputes a chargeback by submitting evidence to the issuing bank through their acquirer. The term means the merchant is re-presenting the original transaction, arguing it was legitimate. A successful representment reverses the chargeback and returns the funds. Each card network sets its own evidence standards and response deadline: 20 days for Visa, 45 for Mastercard, 10 for PayPal.
1. They Can’t Find Their Documentation
Each online sale a merchant makes involves copious amounts of paperwork — including purchase receipts, shipping and delivery confirmations, and customer correspondence. Merchants may find it hard to keep it all organized so that it is easy to find everything needed to quickly respond to a chargeback. But the failure to have an organized system in place can make it virtually impossible for merchants to promptly, accurately and completely submit the compelling documentation that can help them win chargeback disputes.
How to Avoid Making This Mistake
Merchants should take the time today to establish an easy-to-use organizational and storage system for transaction documentation. While there may be some upfront costs associated with starting such a system, they’re certain to be less than the operational costs associated with trying to find unfiled documentation each time a merchant has to respond to a chargeback.
2. They Don’t Respond in Time
While some customers have up to six years to file a chargeback, most customers have at least 120 days from the date of purchase to dispute a transaction. Unfortunately, merchants have a far shorter timeframe for responding. Visa gives merchants just 30 days to respond to a chargeback; MasterCard offers 45. In contrast, PayPal gives merchants only 10 days to submit evidence to counter a PayPal dispute.
And what happens if a merchant doesn’t respond promptly? It used to be that failure to respond meant an automatic assumption of acceptance of the chargeback by the merchants. But with the new Visa Claims Resolution initiative, merchants may now face additional fines if they don’t submit a response to Visa that formally accepts or denies the charge.
How to Avoid Making This Mistake
Merchants should make sure they know exactly how much time each payment platform gives them to respond to chargebacks and then send their response promptly. And if there’s the risk of paying an additional penalty if they fail to respond, merchants need to know that, too.
3. They Bury Their Refund, Return and Exchange Policies
Merchants who make it hard — if not impossible — for customers to find and understand refund, return and exchange policies may find their chargeback levels end up rising. And when merchants try to defend themselves during representment, they have to point to their obscure, unclear policies. It’s not exactly a recipe for success.
How to Avoid Making This Mistake
Merchants must make their policies clear and easy to find, and they should also be prepared to be flexible when it comes to resolving customer dissatisfaction. After all, it’s better for the e-commerce merchant and their business overall to refund a customer’s transaction than to risk fighting a chargeback.
4. They Don’t Understand Reason Codes
It’s easy for merchants to think that all chargebacks are created equal and can be responded to in the same way. But there are dozens of chargeback reason codes that explain exactly why a customer filed a chargeback and what steps a merchant must follow (and what compelling evidence they must submit) to increase their chances of a successful representment.
Credit card issuers also frequently modify their reason codes — Visa just streamlined their 22 reasons into four categories in April 2018 — which means merchants need to keep up. If they don’t, they risk significantly reducing their chances of representment success.
How to Avoid Making This Mistake
Merchants must keep up to date with changing reason codes and ensure they’re familiar with the compelling evidence required to support each one of them.
5. They Aren’t Investing in Fraud Prevention
Some merchants believe their fraud and chargeback rates aren’t high enough to warrant a dedicated fraud prevention team — and that can be a costly mistake. Each $1 of fraud costs U.S. merchants $4.61 in time, fees, penalties, physical goods, and shipping, per the LexisNexis True Cost of Fraud Study 2025, a figure that does not include downstream damage to chargeback ratios or merchant account standing.
How to Avoid Making This Mistake
E-commerce merchants should consider partnering with fraud prevention solutions like ClearSale to protect against both fraud attacks and rising chargeback levels. ClearSale’s 100% chargeback guarantee gives merchants the peace of mind that if ClearSale ever approves a transaction that turns out to be fraudulent and results in a chargeback, ClearSale will pay the entire amount of the chargeback.
Interested in learning more about how our unique approach is helping 2,500 e-commerce merchants? Contact one of our analysts today. They’ll be happy to share more about our chargeback protection and how it can help your business grow.
Frequently Asked Questions about Chargeback Disputes
How long does a merchant have to respond to a chargeback?
Response windows vary by payment network. Visa gives merchants 20 days to respond, Mastercard gives 45 days, and PayPal gives only 10 days to submit evidence. Missing these deadlines forfeits the dispute automatically, and under Visa Claims Resolution, failing to formally accept or deny a Visa chargeback can also trigger additional fines.
What documentation do merchants need to win a chargeback dispute?
Winning representment typically requires purchase receipts, shipping and delivery confirmations, customer correspondence, and proof that your return or refund policy was clearly displayed at checkout. The exact documentation set depends on the reason code: each code specifies what counts as compelling evidence, so merchants must match their submission to the code rather than sending a generic evidence packet.
What is chargeback representment?
Chargeback representment is the formal process by which a merchant disputes a chargeback by submitting evidence to the issuing bank through their acquirer. The term means the merchant is literally re-presenting the transaction, arguing it was legitimate and that the cardholder's claim is unwarranted. A successful representment reverses the chargeback and returns the funds to the merchant.
Why do merchants lose chargeback disputes they should win?
The five most common reasons are: disorganized transaction documentation that cannot be located in time, missing the response deadline, unclear or hard-to-find refund policies that cannot be cited during representment, not tailoring evidence to the specific reason code, and insufficient fraud prevention that drives chargeback rates high enough to threaten merchant account standing.
How many chargeback reason codes exist, and why do they matter?
Visa consolidated its reason codes to four categories in 2018; Mastercard and other networks maintain their own sets, with dozens of codes across the industry. Reason codes matter because they define exactly what evidence a merchant must submit. A representment built on the wrong evidence type, even strong evidence, will not succeed. Merchants must track code changes because networks update them regularly.
What does each $1 of fraud actually cost a merchant?
According to the LexisNexis True Cost of Fraud Study 2025, each $1 of fraud costs U.S. ecommerce and retail merchants $4.61 when time, fees, penalties, physical goods, and shipping costs are included. That figure does not include indirect costs such as damage to chargeback ratios or the risk of losing the merchant account entirely.
Do merchants have to dispute every chargeback?
No. Merchants should weigh the cost of representment against the transaction value and the strength of their evidence. For low-value transactions with weak documentation, accepting the chargeback is sometimes less costly than the labor of mounting a dispute. However, not responding to every chargeback, especially Visa chargebacks, can still carry a penalty under Visa Claims Resolution, so merchants must formally accept or deny rather than simply ignoring the notice.
How does a chargeback guarantee work?
A chargeback guarantee from a fraud prevention provider means the provider, not the merchant, absorbs the cost of chargebacks that result from transactions the provider approved. If the provider approves a transaction that turns out to be fraudulent and generates a chargeback, the provider pays the full chargeback amount. The merchant keeps the revenue from approved legitimate orders and bears no financial exposure on provider-approved fraud.
Stop fraud before it costs you
ClearSale's AI-powered fraud prevention reviews every order and backs it with a chargeback guarantee, so you approve more good orders and fight fewer disputes.
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