Reason code

This reason code applies when a cardholder disputes a transaction, claiming the amount charged differs from what they agreed to at the point of sale. Common scenarios include:​

• Incorrect Amount Entered: The merchant mistakenly entered the wrong transaction amount.​
  
  
• Unauthorized Additions: Additional charges were applied without the cardholder's consent.​
  
  
• Calculation Errors: Mistakes in totaling the purchase led to an incorrect charge.

It’s important to note that Mastercard has discontinued the use of reason code 4831 and incorporated it into code 4834. 

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To address a chargeback under Reason Code 4831, provide evidence that the transaction amount was correct and authorized by the cardholder. This may include:​

• Signed Receipts: Copies of the transaction receipt signed by the cardholder indicating agreement to the amount.​
  
  
• Itemized Invoices: Detailed breakdowns of the goods or services purchased, showing the total amount.​
  
  
• Communication Records: Any correspondence with the cardholder confirming the agreed-upon price.

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To minimize the risk of such chargebacks under reason code 4831

• Double-Check Amounts: Always verify the transaction amount before processing the payment to ensure accuracy.​
  
  
• Obtain Clear Consent: Ensure the cardholder reviews and agrees to the total amount before completing the transaction.​
  
  
• Provide Detailed Receipts: Offer itemized receipts to customers, clearly outlining each charge.​
  
  
• Train Staff Thoroughly: Educate employees on accurate transaction processing and the importance of confirming amounts with customers.

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