Learn about the different chargeback reason codes and what they mean. The codes for each card brand are listed below along with the recommended documentation to provide. You can learn more about each one by visiting the Mastercard Chargeback Guide. For those facing a lower chargeback volume, however, alerts might not provide a positive ROI. School Yeshiva University; Course Title BUS MISC; Uploaded By KidGorilla7385. MASTERCARD. 3 falls under the “Consumer Disputes” category. A reason code is an alphanumeric code that explains the reason behind the dispute. Bank of America issues both Mastercard- and Visa-branded cards, so the exact requirements may vary depending on the Mastercard reason code or Visa reason code . M01: Merchant Accepted Chargeback-Miscellaneous: Amex: M04: Merchant Accepted Chargeback-Miscellaneous: Amex: M10: Capital damages. Merchants can analyze the root causes of their chargebacks by examining the reason code of the chargeback and their own records regarding the purchase in question. There are over 80 unique return codes, and each one represents a different type of return. Chargeback Reason Codes; BIN Lookup; ROI Tool; Company. Issuer Review; Allocation. 101. Issuers will not have the ability to submit lost/stolen fraud chargebacks for chip-on-chip (contact or contactless) AFD transactions. Which is meant to know the reason for the dispute. Thanks for following the Chargeback Gurus blog. However, a truly effective strategy must involve both prevention and disputing cases of friendly fraud. An issuer can initiate a first chargeback when the circumstances of the transaction meet the requirement of a chargeback reason code described in the Chargeback Guide. An XCK entry may be returned up to sixty days after its Settlement Date. If the dispute is deemed valid, the bank or credit union proceeds to issue a chargeback to the merchant. So don’t spend another second worrying about chargebacks. This can be transaction receipts, proof of. Most reason codes apply to any merchant, regardless of what’s being sold. Chargeback Reason Codes Visa. This definitive guide include the chargeback base codes from each away and four more card networks. M01 Chargeback Authorization . Everyone from processors and card brands to local and federal governments has rules about how payments should be handled. The Merchant Reviews the Partial Chargeback Claim. S. Chargeback Reason Codes and Descriptions. Mastercard specifies 21 reason codes under the categories of Fraud, Authorization, Point-of-Interaction Error, and Cardholder Disputes. Partnerships; Integrations; About. MasterCard chargeback reason code 4540. If you receive a chargeback under Reason Code 85, you will need to provide evidence that the credit was processed in order to dispute the chargeback. Issuers must not initiate a chargeback for magnetic-stripe (POS Entry Mode value of 90 or 02) transactions on non-chip enabled cards. In addition to Reason Codes changing as a result of the VCR program, each Reason Code is now associated with a new Reason Category. The reason_code will be one of the following values: chargeback_reimbursement: The gross shows positive if the chargeback was resolved in the seller's favor, and the seller gets a refund. Reason Code 12. If they think it does, they assign it a reason code and credit the funds back to the cardholder’s account. Key-in your chargeback reason code and get a detailed explanation of what it means, how to fight the chargeback, and how to prevent disputes in the future. Merchants who receive a chargeback for a transaction placed with an American Express card may encounter reason code M01, which indicates a chargeback generated as a result of an inquiry from American Express. 3. There are two parts to this. The reason_code will be one of the following values: chargeback_reimbursement: The gross shows positive if the chargeback was resolved in the seller's favor, and the seller gets a refund. As a merchant, you face the brunt of chargeback losses. Reason. Visa reason code 53 is used for Chargeback for Defective/Not as Described, and reason code 85 is used for Credit Not Processed. 4860 Credit Not Processed. 3. M01: Chargeback Authorization: P01: Unassigned Card Number: P03: Credit Processed as Charge: P04: Charge Processed. Standard Threshold: Reaching a chargeback ratio of 0. Additionally, Amex uses a fifth "Miscellaneous" category. Chargeback Reason Codes Fraud – Card-Not-Present (CNP) Network Reason Code Bank Initiation Timeframe Accel 81 120 calendar days from transaction processing date American Express FR2, F14, F24, F29 120 calendar days from transaction processing date Discover 4752 AA, 7030 UA02 Within 30 calendar days from the close date of the TRRUpdated August 23, 2023. Across open networks and include account numbers sent over email, instant messaging, text, or chat. reason codes. Additionally, Amex uses a fifth "Miscellaneous" category. Retrieval request regulations vary significantly from one card brand to another. Vendors that do not have a well-drafted shipping and order fulfillment policy are susceptible to this category of Shopify chargebacks. But cardholders and merchants have different time limits. P08 – Duplicate Charge. Now, 10. M01 M10 P01 P03 P04 P05 P07 P08 P22 P23 R03 R13 Select a code to see the details QUICK REFERENCE Time to respond: 20 days from date of chargeback. A Charge is Disputed * We’ll work directly with the Card Member and try to resolve the case before reaching out to you. M01: Chargeback Authorization: Inquiry/Miscellaneous: M10: Vehicle Rental – Capital Damages: Inquiry/Miscellaneous: M49:. STEP #7: Bank Review & Decisioning. Amazon Pay will send you a notification email when you get a chargeback, which will include details such as the order number and reason code. the requested documentation, your account will be debited. Visa requires processors and banks use to this system for multiple tasks, including challenging initial chargeback results. U Express chargeback reason id M01 falls under the “Inquiry/Miscellaneous” category. Type. Reason codes. deposit not. The cardholder claims they were charged multiple times for a single transaction. For example, American Express has more than a dozen retrieval request reason codes while Discover only has four. Explore more ACH Return Codes. 2. CODE DESCRIPTION A01 CHARGE EXCEEDS AUTHORIZATION AMOUNT A02 NO VALID. As we touched on earlier, chargebacks can happen due to technical errors. Mastercard Chargeback Reason Code 70: Chip Liability Shift. Blog and Articles; Success Stories; Chargeback Reason Codes;. Visa chargeback reason code 75 is filed as an honest mistake. Fight; Prevent;. txt) or read online for free. up under any number of different chargeback . ONE reason code is an alphanumeric code selected from a fixed list by the issuing bank to indicate the reason of cardholder gave for requesting a chargeback. account closed or insufficient funds. You ultimately need a well-documented workflow to ensure the response documentation is. Date Option. Chargeback Reason Codes by Network - 2023 Orientation. The chargeback period, or the time limit for filing a chargeback, depends on the card scheme and the chargeback reason code. For your reference, here's a list of chargeback reason codes for Visa, Mastercard, Discover, and Amex. Only the first four to five digits of the address and the postal code. In fact, 91. One catch is that CE3. Not recognizing your billing descriptor on a statement. 4. Processing Errors involve chargeback and disputes revolving around processing issues, late presentment, credit processed as charge, invalid card numbers, no show errors, incorrect charge amounts. NACHA Return Codes. Use pre-sale fraud detection service providers that can help verify the cardholder’s identity, detect potential criminal activity, and reduce the risk of accepting unauthorized transaction. Accessed October 31, 2022. 1? Visa chargeback reason code 12. There are many reasons why a chargeback occurs, with over 100 reason codes listed across the major credit card brands. Fraud. Reason Code 03: Laundering: The merchant processed transactions that did not involve a bona fide cardholder: Reason Code 04: Excessive Chargebacks: The merchant breached predetermined chargeback thresholds: Reason Code 05: Excessive Fraud: The merchant breached predetermined fraud-to-sales dollar volume thresholds:. 144. 7. Each chargeback has a chargeback reason code assigned to it, which is a two-digit number that corresponds to the reason the customer is disputing the charge. Submitted: The response has been sent and the issuer is. Take, for example, a reason code 4853 chargeback claiming that merchandise or services ordered were not received. Build & Submit a Representment Case in 4 Steps ACH Return Codes. What are reason codes?. Pages 124 This preview shows page 90 - 93 out of 124 pages. Time to respond: 20 days from date of chargeback. customer rec goods/srvcs, but not charged. 15, 2021. A chargeback reason code is a 2-to-4-digit alphanumeric code provided by the issuing bank involved in a chargeback, which is meant to identify the reason for the dispute. Visa uses a numeric scheme for its chargeback reason codes. Reason codes are important to help merchants address recurring. Reason Codes A chargeback reason code is a distinctive two-to-four-character combination of letters and numbers issued by the involved bank to identify why a dispute was initiated. Blog and Articles; Success Stories; Chargeback Reason Codings; DUMPSTER Look-up;. Card Member cancelled, refused or returned goods and/or services American Express Chargebacks / Disputes. By entering your email, you agree to receive marketing emails from Shopify. chargeback_settlement: The gross shows negative if the chargeback was resolved in the buyer's favor, and the funds return to the buyer. These reason codes indicate disputes that occur as a result of inaction or wrong action on either party’s part (merchant or cardholder). A chargeback reason code is a 2-to-4-digit alphanumeric code given by the issuing bank tangled in a chargeback. What Are the Time Limits for Mastercard Chargeback Arbitration? Starting from the date the chargeback representment was filed, issuing banks have 45 calendar days to file a pre-arbitration. Protect stored cardholder data. 10/21/14 Updated Chargeback Time Frames: Added Reason Code 05; Addendum Reason Code PM; Changed TF time frame from 120 days to 540 days. A chargeback attempt may fail if there is not a valid reason for it, and card issuers are unable to force a merchant’s bank to refund credit card payments. You can see a reason code 11. 4: Other fraud: Card-absent environment: VCR Dispute Reason Code 13. The list of chargeback reason codes in this article. Understanding chargeback reason codes is one of the most essential parts of effective chargeback management. The standard chargeback process involves eight steps: Retrieval request: The card-issuing bank requests that the acquiring bank provide additional information for a given transaction. Solution. Chargeback amount is equal to or less than the exceeded limited /authorised amount. Under Set Order Status, select None, Refund, or Chargeback. Under the new VCR process, there will be 4 dispute categories: Fraud, Authorization, Processing Errors and Consumer Disputes. 0: Updated report version from 1. Reason Code M01: Chargeback Authorization. Chargeback reason code - A numeric, custom way to explain the reason of raising a chargeback specific per Card Scheme, e. Reason Code. There are multiple situations in which this can occur. Chargebacks. Use pre-sale fraud detection service providers that can help verify the cardholder’s identity, detect potential criminal activity, and reduce the risk of accepting unauthorized transaction. American Express Chargebacks / Disputes. This list was generated 5/4/2022. EMV Liability Shift Non-Counterfeit Fraud. 2 chargeback if you override a declined, referral, or pickup authorization message, but process the transaction anyway. The notification will also specify the terms of the agreement under which Amazon Pay will assist you in handling the chargeback. The reason_code field lists the reason code the issuing bank has assigned to the chargeback. Select the value “open”. Investigate suspicious orders. Chargeback reason code. Lack of proper chargeback reason codes. MASTERCARD Reason Code Description. customer charged, did not rec goods/srvcs. It is important to identify and understand the root cause and take the necessary steps to dispute the chargeback. The length and structure of Reason Codes changed from a current two-digit code to four to six digits that contains decimal(s) point(s). All cardholder data must be encrypted, truncated, or tokenized; account numbers can only be partially displayed. Here are the two possible scenarios: 1. reason_description: string. However, it is important to note that this reason code is based on the reason given by the customer to their bank. Based on the information provided, Paymentology will investigate the transaction being disputed. This reason code is used when the cardholder claims that their card was used fraudulently without their permission. Collect Compelling Evidence. 1: EMV Liability Shift Counterfeit Fraud:. Chargeback Base Codes by Network - 2023 Guide. customer charged, did not rec goods/srvcs. Once filed, the merchant generally has 20 days to respond. Once filed, the merchant generally has 20. Discover is a credit card network and an issuing bank—just like American Express. Fine Period - month 2 or 3. So don’t spend another second worrying about chargebacks. There are several types of chargeback reason codes that can be used, including the following: 1. The following is a full list of Chargeback Reason Codes for the card schemes that Zai supports. chargeback_settlement: The gross shows negative if the chargeback was resolved in the buyer's favor, and the funds return to the buyer. M01 Acct Notice - processed Chargeback authorization M02 Acct Notice - processed your credit M03 Acct Notice - processed your credit M04 Acct Notice - debit stands M05 Acct Notice - ch does not agreeP01 – Unassigned Card Number. So, if a customer files an Amex chargeback, the company has good reason to side with their customer over the merchant. The main chargeback reasons look like this: Malicious fraud. g. The first two digits indicate what category the reason code falls under: 10 for Fraud, 11 for Authorization, 12 for Processing Errors, and 13 for Customer Disputes. It is caused by things like beliefs, opinions, morals, regrets, fear, and confusion. Each reason code has certain standards of proof and evidence associated with it that determine whether the chargeback is valid or not. Your comprehensive guide to chargeback reason codes, transaction modifiers, time limits, and compelling evidence for the four major card brands. 4841 Canceled Recurring or Digital Goods Transactions. P22 – Non-Matching Card Number. 3. A02: No Valid Authorization. It was originally just one facet of legacy reason code 81. Which fraud reason codes will be included in EMV Liability Shift? How are Lost/Stolen transactions affected? A. Each of the major card brands, including Visa, Mastercard, and others, have their own system of reason codes. Signifyd’s Revenue Protection solution offers fraud screening services to help merchant subscribers protect against fraudulent or unauthorized activity with respect to certain e-commerce transactions, as classified by the applicable card processor’s chargeback. Each code begins with 'R' followed by a two digit number. Survey data from the 2019 Chargeback Field Report found that 82% of merchants surveyed believed that the Visa Claims Resolution process had “little to no impact on chargeback management. 4. The implication is that the merchant is at fault. Card Brand Code Description Days to Dispute Dispute Category;. P01 – Unassigned Card Number. If more information is needed, you’ll either receive an Inquiry or a Chargeback. Discover chargeback reason code 7030. The issuing bank initiates the first chargeback on behalf of the cardholder by sending a chargeback notification to Adyen stating the dispute reason. Discover - UA02 Fraud – Card Not Present Transaction. Once you receive this notification, you have 11 days to submit a response. There are two parts to this. Both EFM and ECM measure compliance at the MID level. Less than 20% of merchants noted a slight decline in Visa chargebacks after VCR, while over 55% reported no decline in chargebacks. Merchants can find a. After an authorization request is declined, the merchant forces the transaction through, typically by key-entering it, without making another authorization. 4. American Express Chargebacks / Disputes. 1: Use the corresponding dates from the invoice. See the list of reason codes below: Card Network. 4854 Cardholder Dispute—Not Elsewhere Classified (U. Chargeback fees make up a big chunk of the total costs, so we’re going to take a. If you choose to fight the chargeback, Amazon Pay will charge you a $20 Disputed Chargeback Fee. chargeback of credit without receipt. compliance process depending on whether a chargeback right exists. Mastercard uses a four-digit numbering scheme for its chargeback reason codes. Step 2: Customer initiates the chargeback. By entering your email, you agree to receive marketing emails from Shopify. In some cases, errors can be resolved and reversed, but there is no equivalent to chargeback representment when it comes to ACH. By understanding the reason behind the chargeback, you can gather the necessary evidence to support your case effectively. 2: Canceled Recurring Transaction, and those disputes would still go through the normal chargeback process. Understanding chargeback reason codes is one of the most essential parts of effective chargeback management. 5 billion lost in 2020. The following chargeback reason codes are related to EMV: Visa: 10. Support; Login. Many subscription payment disputes are made under code 13. Code. To submit your documents to Wave, use the link in the chargeback notification email, or reply to the email. During this process, the representative of the institution examines the reasons’ list. A chargeback happens when a customer requests for a transaction to be reversed. EMV Liability Shift Counterfeit Fraud. The issuing bank will then pass on the chargeback to the merchant. Category. P08 – Duplicate Charge. The following are some examples: Visa Reason Code 13. Chargeback Reason Codes Retrieval Reason Codes 78 Int'l only Service Violation Code Discover 4541 AP 4586 AW 4755 RG 4553 RM 8002 RN2 Altered Amount Non-Receipt of Goods or Services0Cardholder Disputes Quality of Goods or Services MasterCard;45 Days from the central processing date of the transaction120 Days from the central processing. 1 – Merchandise/Services Not Received; Mastercard Reason Code 4853 – Goods or Services Not as Described or Defective;. American Express chargeback reason codes are divided into five categories: authorization, cardmember disputes, fraud, processing errors, and miscellaneous. • Removed reason code 4840 (Fraudulent Processing of Transactions) Chapter 1—General Information. For each reason code, a definition is provided along with the merchant’s actions—or failure to act—that may have caused the chargeback,Yank Express chargeback reason code M01 falls on the “Inquiry/Miscellaneous” category. P03 — Credit Processed as Charge Reason codes vary by card brand. This return reason code may only be used to return XCK entries. Once you submit the documentation to Wave, our Disputes Resolution Team will work on the case, and submit the required information to the bank on your behalf. 4853 – Cardholder Dispute – Credit Posted as a Purchase. When a cardholder disputes a charge, their issuing bank will review the transaction and decide if. Each of the major card brands, including Visa, Mastercard, and others, have their own system of reason codes. M01: Chargeback Authorization: M10: Vehicle Rental -. Following the prompts that pop up, inform PayPal of every detail, and include the screenshots of the conversations you had with the scammer. Depending upon the class, a retailer will have a swift way to offer evidence supporting the claim. The network hasn't wholly disallowed some old codes. If the available information indicates that the customer dispute is a valid one, American Express will automatically debit your merchant account for the amount of the disputed transaction and will send you a chargeback notification for you to review. The newer system is designed to. Yes. Chargeback. Blog and Articles; Success Stories; Chargeback Reason Codes; BIN Look-up; eGuides the Reports; Webinars; Knowledgebase; Online; Partners. It gets worse. It is associated with a chargeback. 1: Merchandise/services not received Visa uses this reason code when a customer claims they didn’t receive the goods or services they ordered from your business. 04/20/13 Visa and MC Retrieval Codes — removed retired codes MC Reason Code 372 address the specific dispute reason with the documents you send. This definitive guide comprise which chargeback reason encrypted with apiece of the four greater bill networks. It makes sense that merchants would use any tool they can to prevent payment reversals, especially when it comes to true fraud. 2 EMV Liability Shift. Most commonly the payer is a consumer. ” One might almost consider this chargeback a technicality, as is only existing when the merchant explicitly agreed until take responsibility since a contention and accept a chargeback. About Us; Careers We're hiring! In The Press; Latest News; Events; Corporate Responsibility; Brand Resources; Contact Us. 1=1010, 10. It is subject to change and may not include every currently known dispute reason code. 9808 info@chargebacks911. Chargeback Reason Codes Reason code are the first key to understanding the root causes . These codes explain the reason why the chargeback was filed, and the reason the chargeback was approved. While you obviously don’t want customers to cancel their service, a cancelation is far better than a chargeback. 0 is to make the chargeback process more efficient, transparent, and fair. Prevention alerts arrive within 24 hours of a dispute. VCIPayments; NMI;. Chargeback Reason Codes for AMEX. Despite being the smallest of the four major credit card companies, the list of Discover chargeback reason codes is extensive. VCIPayments; NMI;. 3 is part of an updated and expanded revision of the legacy codes that indicated fraud, codes which were phased out under the Visa Claims Resolution initiative. Get your complete guide to Amex reason codes, including all the detailed information, chargeback time limits, and other important information you need. “American Express Chargeback Reason Codes | Sift”. Click on “report a problem” and select the transaction in question. 634. Each chargeback reason code has specific rules and documentation requirements. 16, 2021. If the available information indicates that the customer dispute is a valid one, American Express will automatically debit your merchant account for the amount of the disputed transaction and will send you a chargeback notification for you to review. [noun]/* kə • stə • mər • di • spyo͞ot/. When the customer disputes a charge, the issuing bank then begins the chargeback process. Ready to see MidMetrics™ in action. ↩ Back to Directory. FAQ: What is Chargeback. 0 only applies to reason code 10. processed the transaction correctly. Example: 25. Stage #1: Awareness - be aware of the chargeback response time limitIn fact, for every dollar lost to chargebacks in 2019, the average merchant lost an additional $2. With the implementation of Visa Claims Resolution, reason code 98 eventually became obsolete. The networks say merchants have a 45-day response window, but the Chase credit card chargeback time limit for merchants is 39 days. FR6 Partial Immediate Chargeback Program. Administrative returns (R02, R03, R04): 3%. 1 EMV Liability Shift 10. invalid adjustment received - req. UA10 Request Transaction Receipt (swiped card transactions) UA11 Cardholder claims fraud (swiped transaction, no signature) These chargebacks occur to resolve chargeback-related disputes between network members. 140. M01 Chargeback Authorization; Processing errors. Eligible Chargeback Reason Codes . Card Member cancelled, refused or returned goods and/or. It’s doable – a chargeback is not an ultimate revenue loss at face value. From there, the merchant can look up the code to figure out what the dispute is about. 1 = EMV-Liability Shift counterfeit. For example, the dispute reason “Cardholder Does Not Recognize” is denoted under the Discover reason codes system as “AA. It’s a 3-digit alphanumeric shorthand attached to a returned ACH transaction explaining why an ACH transfer is reversed. Automated Clearing House return codes, reasons, and details. What are the odds a merchant will “win” the chargeback dispute? The true odds depend on the strength of the compelling evidence and the chargeback reason code itself. ECM monitors first presentment chargebacks regardless of reason code or transaction type. Fraudulent Activity. Here are some chargeback reason codes by card type. Immediate Chargeback Program: FR5: No Further Recourse: FR6: Partial Immediate Chargeback Program. MASTERCARD Reason Code Description 01 Requested Transaction Data Not Received 02 Requested\Required information illegible or missing 07 Warning Bulletin File 08 Requested\Required authorization not obtained 12 Account number not on file 31 Transaction amount differs 34 Duplicate Processing P01 – Unassigned Card Number. If you believe you have received an ACH return in error, you can contact your bank. resolved via the chargeback management process and within timeframes. UA10 Request Transaction Receipt (swiped card transactions) UA11 Cardholder claims fraud (swiped transaction, no signature)These chargebacks occur to resolve chargeback-related disputes between network members. There are also third-party tools available to conduct advanced analysis. You double and triple check your customer service records to see if the customer wrote in about the shipment (they haven’t), you check the tracking. Time and Labor. It should ultimately help prevent fraud and unwarranted chargebacks, specifically applying to disputes marked with a Visa reason code 10. Mastercard Chargeback Reason Code 70: Chip Liability Shift. Chargeback reason code 4853 can be used to indicate disputes where the cardholder simply claims that the merchant never delivered on what was promised. Cardholders and card issuers can place disputes on transactions for a variety of reasons including product returns, defects, cancelled reservations, and card processing errors. Try Shopify free for 3 days, no credit card required. Chargeback reason codes 71 and 4808 are caused when merchants ignore a declined authorization response from the issuer and attempt one of the following actions: Forced posting. A01 — Charge Amount Exceeds Authorization Amount The approved authorization amount is less than the amount of the sale submitted by the merchant. The business has the chance to refute the chargeback. 04/09/14 Discover: DC, U02. Assemble Your Evidence. 4 Ways to Fight Chargebacks: Gather compelling evidence. In this instance, the cardholder claims a misrepresentation of the order they received, such as a defect, damage, counterfeit, or incomplete merchandise. 146. There is a USD 25 limit for the First Chargeback (Reason Code 22). A chargeback happens when a customer requests for a transaction to be reversed. 103. Time Limit (Issuer/Cardholder) 120 Days. Save finalize leaders includes the chargeback good codes off each of the four major card networks. If you did not receive the email, open Mave, Wave’s automated chatbot, and. M01. The assigned chargeback reason code outlines why a customer submitted the dispute. Visa’s 22 chargeback reason codes will be merged into client disputes – fraud, authorization, processing errors, and four guidelines. Read on for the complete guide to dealing with chargebacks. Analyze your chargeback data. Time Limit (Acquirer/Merchant) 20 Days. 04/09/14 Discover: DC, U02. Quickly and proactively respond to customer complaints. There are dozens of reasons why cardholders and issuers dispute transactions. 3 is an updated version of legacy Visa reason code 72, which was phased out under the Visa Claims Resolution initiative. It’s important that you include a copy of your customer terms and conditions in order to prove that the customer knew what to expect from the outset. MDR also retired reason code 4840 – Fraudulent Processing of Transactions. Written to Chargeback Gurus. 75 for every $1. For example, 10. Scenario 2. Visa groups its chargeback codes into four main categories—fraud, authorization, processing errors, and customer disputes. P04 – Charge Processed as Credit. Visa specifies 46 reason codes under the categories of Fraud, Authorization, Point-of-Interaction Error, Consumer Disputes, and Processing Errors. Terms and conditions. Responding to Mastercard Reason Code 4853 Chargebacks. Why did I get a chargeback with AmEx reason code M01? How can I prevent this dispute in the future? Can I fight this chargeback? Learn more from Midigator!Reason Code M01 : Chargeback Authorization ↩ Back to Directory Dispute Card Issuer American Express Reason Code M01 Category Inquiry Claim American Express sent a. Overall returns (all codes): 15%. Feel free to submit topic suggestions, questions or requests for advice to:. American Express chargeback reason code C42. 634. If a customer makes a chargeback request on the basis that he or she has not authorised the transaction, the customer's bank will charge the transaction back to the merchant’s bank. Code 10. Chargeback Reason Codes Card Type Reason Reason Text Chargeback Category Preventable Reversible Code DISCOVER 4502 IC-Illegible Sales Data Request forReceive the Chargeback. Understanding these codes is essential because they'll guide your response strategy. For this reason, you must document all debit and credit card transactions and adhere to the strict rules set by the card networks. Know these five rules to avoid payroll blunders triggering fines, penalties and IRS audits.