When a customer disputes a charge with their bank, you don’t have to accept the loss. The process of fighting back is called representment, and it involves submitting evidence to your payment processor proving the original transaction was legitimate. Winning depends on responding quickly, matching your evidence to the specific reason code, and writing a clear rebuttal. Here’s how the process works from start to finish.
How the Dispute Reaches You
A chargeback starts when a cardholder contacts their bank (the issuing bank) and claims a charge is unauthorized, duplicated, or otherwise invalid. The issuing bank temporarily credits the cardholder and sends the dispute to your acquiring bank or payment processor. Your processor then notifies you, usually through your merchant dashboard or by email.
This notification includes a reason code that tells you why the cardholder is disputing the charge. Reason codes fall into broad categories: fraud or unauthorized use, goods or services not provided, duplicate charges, and charges for the wrong amount. The reason code determines what kind of evidence you need to submit, so read it carefully before doing anything else.
Response Deadlines That Matter
The clock starts ticking when the chargeback is filed, not when you receive the notification. That distinction matters because processing delays can eat into your window. Visa, American Express, and Discover give merchants a maximum of 20 days to respond. Mastercard allows up to 45 days per phase. In practice, your acquirer or payment processor may impose shorter internal deadlines, sometimes as tight as 5 to 10 days. When your processor’s deadline is shorter than the card network’s, the shorter one applies.
Missing the response deadline results in an automatic loss regardless of how strong your evidence is. Set up alerts so dispute notifications don’t sit unread in an inbox for a week. If you use a platform like Stripe, Shopify Payments, or Square, check whether it offers automated notifications or a disputes dashboard that shows countdowns.
Gathering the Right Evidence
Your evidence package needs to directly counter the cardholder’s claim. Generic proof of a transaction existing won’t cut it. Tailor your documentation to the reason code.
- Fraud or unauthorized transaction: Show that the real cardholder made the purchase. Useful evidence includes AVS (address verification) and CVC match results, the IP address used at checkout (especially if it matches the cardholder’s billing region), signed delivery confirmations, and any prior purchase history from the same account or device.
- Goods or services not provided: Prove delivery happened. For physical products, include shipping carrier tracking numbers and delivery confirmation with dates. For services, include records showing the service was rendered: appointment logs, project files delivered, or communication confirming completion.
- Duplicate charge: Show that each charge corresponds to a separate order or service. Include distinct order numbers, itemized receipts, or timestamps proving the transactions were for different purchases. If there truly was only one charge and the cardholder is mistaken, provide your transaction records showing a single entry.
- Product not as described: Provide the original product listing, terms of service, and any correspondence where the customer confirmed satisfaction or where you offered a resolution they declined.
For every dispute type, also include a copy of your refund and cancellation policy, especially if the customer agreed to it at checkout. Screenshots of the policy as it appeared during the purchase carry more weight than a link to your current terms page.
Evidence for Digital Products
Digital goods present a unique challenge because there’s no shipping receipt to point to. For software, downloads, subscriptions, or digital content, include the IP address used at purchase and at the time the content was accessed, system logs showing the customer downloaded the file or logged into your service, and timestamps of usage after the purchase date. If the customer used your product for days or weeks before filing a dispute, that usage history is some of your strongest evidence.
When truncating card numbers in any documentation you submit, show only the last four digits. Mastercard specifically recommends replacing the remaining digits with fill characters like X or asterisks to protect cardholder data.
Writing the Rebuttal Letter
Along with your evidence, you need to submit a rebuttal letter. Think of it as a cover letter that ties everything together. It should be concise, factual, and organized. Avoid emotional language or accusations about the cardholder’s motives.
A strong rebuttal letter includes four things: a brief summary of the transaction (date, amount, what was purchased), a clear statement of why the dispute is invalid, a numbered list of each piece of evidence you’re attaching with a one-sentence explanation of what it proves, and your conclusion requesting the chargeback be reversed. Keep it to one page. The bank analyst reviewing your case may handle dozens of disputes a day, so make your argument easy to follow at a glance.
Submitting Through Your Processor
You submit your evidence and rebuttal through whatever system your payment processor provides. Most modern processors have a dispute section in the merchant dashboard where you can upload files directly. If you use a traditional merchant account, your acquirer may require submission through a specific portal or even by fax in some cases.
Once submitted, your acquirer forwards your evidence package to the card network, which passes it to the issuing bank. The issuing bank reviews everything and decides whether to reverse the chargeback in your favor or uphold the cardholder’s dispute. This review typically takes 60 to 75 days, though timelines vary by network.
If the issuing bank rules against you, most card networks offer one more level of appeal called arbitration. Arbitration involves the card network itself making the final decision. Be aware that arbitration carries additional fees, often several hundred dollars, and the network’s decision is final.
What a Win and a Loss Look Like
If you win the representment, the chargeback is reversed. The disputed funds return to your account, and the temporary credit to the cardholder is removed. However, most processors still charge a chargeback fee for the initial dispute regardless of the outcome. These fees typically range from $15 to $100 per dispute depending on your processor and your agreement terms.
If you lose, the cardholder keeps the refunded amount and you absorb the chargeback fee on top of it. You also lose the cost of whatever product or service you provided. For high-value transactions, that makes a thorough evidence package well worth the time investment.
Keeping Your Chargeback Ratio Low
Beyond individual disputes, your overall chargeback rate affects your standing with card networks. Visa and Mastercard monitor merchants and flag those whose dispute volume exceeds roughly 1% of transactions. Cross the 1.5% threshold and you enter excessive-risk territory, which can trigger penalty fees, mandatory remediation programs, or even termination of your ability to accept card payments.
Preventing disputes in the first place is more effective than winning them after the fact. Use clear billing descriptors so customers recognize charges on their statements. Send order confirmation and shipping notification emails. Make your refund policy visible and easy to use. Customers who can get a refund directly from you have less reason to call their bank instead.
Keep organized records of every transaction, including order details, customer communications, delivery confirmations, and signed agreements. If a dispute does arrive, having this documentation already filed means you can respond in days rather than scrambling to reconstruct a transaction from months ago.