Reason Codes
Timeframes
Evidence Requirements
Issuer Mistakes
Cardholder Communication
100

This is the Mastercard reason code for “Fraud – Card Present Environment.”

What is 4837?

100

Number of calendar days a merchant typically has to respond to a chargeback.

What is 45 days?

100

This must be obtained from the cardholder before initiating a chargeback.

What is a written cardholder statement or claim?

100

This happens if an issuer files a chargeback outside the allowed timeframe.

What is chargeback invalidation?

100

Before initiating a dispute, the issuer must ensure the cardholder has done this.

What is attempted to resolve with the merchant?

200

This reason code is used for “Goods or Services Not Provided.”

What is 4855?

200

Most chargebacks must be initiated within this many days from the transaction processing date.

What is 120 days?

200

For fraud claims, the issuer must confirm this with the cardholder.

What is that they did not authorize or participate in the transaction?

200

Initiating a chargeback without cardholder contact or claim is a violation of this Mastercard requirement.

What is Good Faith Investigation?

200

This document, signed or confirmed by the cardholder, is needed for most disputes.

What is cardholder letter of dispute?

300

This code relates to “Cancelled Recurring Transaction.”

What is 4841?

300

True or false: Some chargebacks allow 60 days from the date of discovery rather than the transaction date.

What is True.

300

This evidence is not required for a 3DS-authenticated transaction fraud dispute.

What is proof of cardholder non-involvement (because 3DS shifts liability)?

300

Failing to use the correct reason code can result in this outcome.

What is dispute rejection or reversal?

300

When a cardholder disputes a subscription charge, the issuer should ask for this.

What is proof of cancellation?

400

This chargeback reason is used when “Cardholder Does Not Recognize Transaction.”

What is 4863?

400

The time limit to file a chargeback for reason code 4853 (Cardholder Dispute – Defective Merchandise).

What is 120 days from date of discovery?

400

Issuers must submit this document to Mastercard if requested during compliance or arbitration.

What is compelling evidence or supporting documentation?

400

Submitting a chargeback for a 3DS-authenticated transaction without checking fraud liability leads to this.

What is improper filing – issuer liability?

400

True or False: The issuer can proceed with a Fraud dispute even if the cardholder admits to using the service.

What is False?

500

Code 4834 can cover multiple issues, including this subcategory.

What is 4834 – Late Presentment?

500

This condition must be met for a chargeback involving services that were not rendered due to cancellation.

What is Proof that the service was cancelled before fulfillment?

500

When submitting a chargeback for “Not as Described,” issuers must provide this specific detail from the cardholder.

What is how the product/service differed from what was promised?

500

Filing a fraud chargeback when the cardholder was present and PIN was used may violate this rule.

What is EMV liability shift rules?

500

Cardholder claims of fraud must include this statement for issuer documentation.

What is they did not authorize or benefit from the transaction?

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