A cardholder who disputes a transaction can have the payment reversed through the card network. The process runs on defined rules and deadlines, and it allocates the loss rather than investigating the truth.
The dispute is raised with the issuer, not the merchant
The cardholder contacts the bank that issued the card, which assesses whether the complaint fits one of the network's defined reason codes.
Reason codes cover categories such as unauthorised use, goods not received, goods not as described, and processing errors.
The classification matters because each code carries its own evidence requirements and time limits, and a dispute filed under the wrong code can fail regardless of merit. Filing windows are measured from the transaction or the expected delivery date depending on the category.
Funds move before the merits are established
If the claim passes initial assessment, the issuer debits the merchant's acquirer and credits the cardholder provisionally.
The merchant sees the sale amount withdrawn, usually with an additional fee, before having presented any response.
This ordering reflects a deliberate choice to place the cardholder in funds during the dispute, with the merchant carrying the exposure in the interim.
Representment is the merchant's response
The merchant may contest the reversal by submitting evidence, which must address the specific reason code rather than the dispute generally.
Delivery confirmation, authentication records, terms accepted at checkout and communication history are the typical materials, and their relevance depends on the code cited.
Deadlines are short and strictly enforced, so operational readiness matters as much as the underlying facts. A merchant unable to retrieve records quickly loses cases it would otherwise win.
Unresolved cases escalate through the network
Where the issuer rejects the evidence, the case can move to further stages and ultimately to arbitration administered by the card network.
Arbitration carries substantial fees for the losing side, which deters escalation of low-value disputes regardless of who is right.
Most cases therefore conclude earlier on economic grounds rather than on a determination of the facts.
Chargeback ratios carry consequences beyond the loss
Networks monitor the proportion of a merchant's transactions that are disputed, and exceeding thresholds triggers monitoring programmes with fees and required remediation.
Persistent breaches can result in a merchant losing card acceptance entirely, which is a far larger consequence than the disputed amounts.
This is why merchants invest in clear billing descriptors, responsive service and delivery evidence, all of which reduce disputes before they are filed.