chargeback reason code c02. 04/20/13 Visa and MC Retrieval Codes — removed retired codes MC Reason Code 37American Express Chargebacks / Disputes. chargeback reason code c02

 
 04/20/13 Visa and MC Retrieval Codes — removed retired codes MC Reason Code 37American Express Chargebacks / Disputeschargeback reason code c02 2 – EMV Liability Shift Non-Counterfeit Fraud

2. Once filed, the merchant generally has 20. Mastercard uses reason code 4842 for late presentment chargebacks, but the conditions are considerably more complex. Chargeback reason code description – An explanation which provides the reason of raising a chargeback by the cardholder. Each code has a different timeline. Provide Explanation Give a clear overview of the documents you’re submitting, address the specific dispute reason, provide any changes made to the original purchase/agreement and explain the steps you’ve taken to resolve the dispute. American Express Chargebacks / Disputes. 7. 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. 2. Chargeback Reason Codes / American Express / C02 – Credit Not Processed Reason Code C02 Category Cardmember Disputes DESCRIPTION Why did I receive this. Updated Disputes/Chargeback Policy Coming April 2024Here are some numbers on chargeback reason codes: 30% - the number of chargebacks that result from transactions made with a stolen card. Below are some examples of more common reason codes. 2. The cardholder may be the customer or the someone who lent their card to a friend or relative. 1; Reason: EMV Liability Shift. Chargeback. Chargeback Reason Code Quick Reference Guide. 60. The transaction amount and authorization number (ARN. g. 2 is the result of receiving a declined authorization but going ahead with the transaction anyway. Maestro. The reason for the dispute was false or inaccurate. If one member believed the other violated a Visa rule when handling a chargeback, they filed a pre-compliance chargeback for compensation. Visa anticipates that changes to the required up-front information will help eliminate the back-and-forth between merchant, acquirer, and issuer, intending to result in a quicker chargeback resolution time for our merchants. Also, Ethoca Alerts only notify you of chargebacks that occur within the alert. 7. UA05 Fraud – Chip Counterfeit Transaction. This code is used when a cardholder claims that a fraudulent transaction occurred in a face-to-face environment, such as a retail store. 0, these guidelines guarantee merchant protections from certain categories of disputes. To subscribe and learn more about the free online chargeback management system, or contact Chase Paymentech Client Services at 1. A risk department can accurately analyze what the issue is with their merchant by seeing the individual reason code,” Cirone explained. The shorthand description is “Credit Not Processed. It also applies when a customer claims they tried to cancel. CODE DESCRIPTION A01 CHARGE EXCEEDS AUTHORIZATION AMOUNT A02 NO VALID. chargeback management with an easy to use online system. 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 date of. ) Visa and Mastercard Chargeback reason codes. But cardholders and merchants have different time limits. 265. resolved via the chargeback management process and within timeframes. Each reason code has certain standards of proof and evidence associated with it that determine whether the chargeback is valid or not. Number two: Product Not Received chargebacks. 265. 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. Once filed, the merchant generally has 20 days to respond to the chargeback. This return reason code may only be used to return XCK entries. 10. So don’t spend another second worrying about chargebacks. Description: Reason code for applying handling fee. Articles; Chargeback Reason Codes;. The list of chargeback reason codes in this article. When a cardholder makes a purchase, but regrets it later, they may file a chargeback to recoup their money. If the dispute is deemed valid, the bank or credit union proceeds to issue a chargeback to the merchant. We also included the reason code descriptions and an indication of when the allowable time frame begins. To help merchants understand the underlying issue of each chargeback, American Express has created specific chargeback reason codes to help business owners interpret chargebacks. The customer returned a product or service, but a credit was never processed by the merchant. Issued the credit but did not deposit it with its processing bank in time for it to appear on the cardholder’s next statement. Simple Order API; Virtual Terminal; Secure Acceptance - Hosted. Based on the information provided, Paymentology will investigate the transaction being disputed. 2. At Visa they used to receive reason code 98. This could result from a bank buying another bank, which would cause routing numbers to change. 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. R02 Account is closed, R03 No account on file, R04 Invalid account number. Goods and services not as described or cardholder received defective goods or services 3. The EMV SRC system can use device information to pull customer and card information through the system and automatically verify the customer. 6, "Chargeback Reasons" Added requirements for each Chargeback Reason code. ”. Enter the code that identifies the reason that a chargeback was generated for an invoice during receipt entry. Learn the details, the cause, how to respond and how to prevent American Express Reason Code C02 Credit Not Processed . The existing 22 chargeback reason codes will be replaced by new reason codes and grouped into 4 categories: 1. R05 – Unauthorized debit to consumer account using Corporate SEC code. Note that a chargeback is a forced bank reversal that always results in additional fees and penalties for sellers, regardless of the validity of the buyer’s claim. Additionally, Amex uses a fifth "Miscellaneous" category. 6). ”. Even though these codes are not detailed enough, they are crucial when it comes to successfully preventing and fighting chargebacks. Common reason codes Mastercard. Collect Compelling Evidence. C14 – Paid by Other Means. 2 address the specific dispute reason with the documents you send. Depending on the specific situation, Mastercard will match authorization response to one of the following merchant advice codes: Mastercard Response Code. • Clarified support required to request a Chargeback Reversal for Credit not processed (ISO 4513) / Goods/ services returned or refused (C04). Amex uses the same four main categories as Visa to organize its reason codes: Authorization, Card Member Disputes (which Visa refers to as Consumer Disputes), Fraud, and Processing Errors. The good news is that most of these invalid claims are disputable by the merchant. Pursuant to the Fair Credit Billing Act of 1974, cardholders have the right to dispute unauthorized or erroneous charges, and issuing banks must reverse a disputed transaction if the cardholder’s claim. Consider Deadlines. 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. 4853 – Cardholder Dispute – Credit Posted as a Purchase. CODE DESCRIPTION A01 CHARGE EXCEEDS AUTHORIZATION AMOUNT A02 NO VALID. have 20 days to respond. FR6 Partial Immediate Chargeback Program. You’ll want to carefully review all chargeback reason codes so you are familiar with the very detailed regulations. This is a relatively common. 0" or CE3. Most Common Chargeback Reason Codes #3: Order Significantly Not as Described. Technical. Blog and Articles; Success Stories; Chargeback Reason Codes; WASTEBASKET Look-up; eGuides both Reviews;. com Europe. The Fintech Times. Issuers will not have the ability to submit lost/stolen fraud chargebacks for chip-on-chip (contact or contactless) AFD transactions. Solutions. Discover. Administrative returns (R02, R03, R04): 3%. 7: Defective goods and services: C32: RM: 13. With that said, you still need to understand the reason codes with any chargebacks from Amex. Some 90% of merchants said “cardholder abuse of the chargeback process” was a leading concern for their business. It’s a 3-digit alphanumeric shorthand attached to a returned ACH transaction explaining why an ACH transfer is reversed. Scenario 2. Investigate suspicious orders. Effective for Transactions completed on or after 15 April 2016, A Transaction for which Authorization was obtained after a Decline Response was received for the same purchase. The most common chargeback reason codes are fraudulent charges, unauthorized transactions, and products not received, however, there are dozens of different chargeback reason codes for cardholders to choose from. Valid Values/Format: 22 - First Chargeback Handling Fee. A Complete Listing of all American Express Chargeback Reason Codes Prohibited Business Types American Express Tools That Help Prevent Chargebacks. The new reason codes follow a format of two digits, a period, then a third digit. 04/20/13 Visa and MC Retrieval Codes — removed retired codes MC Reason Code 37American Express Chargebacks / Disputes. The goal is to reduce. C18 – “No Show” or CARDeposit Cancelled. Scenario 1 — upfront chargeback. 5 Visa will also place new rules to effectively target Rules. Field name: reasonCode. People request chargebacks for all kinds of reasons—some sinister (like friendly fraud), some because the item they bought never arrived. 800. Reason Code C02 Category Cardmember Dispute Claim The cardholder claims the merchant was to issue a refund, but the amount hasn’t been credited to the card. WEX has repurposed chargeback reason code 10 to indicate EMV chargebacks. How you respond is determined by the chargeback reason code: Embed This Graphic. C02 – Credit (or partial credit) Not Processed; C04- Goods/Services Returned or Refused; C05 – Goods. Chargeback Reason Key by Network - 2023 Guide. chargeback_settlement: The gross shows negative if the chargeback was resolved in the buyer's favor, and the funds return to the buyer. chargeback_settlement: The gross shows negative if the chargeback was resolved in the buyer's favor, and the funds return to the buyer. Responding to Mastercard Reason Code 4853 Chargebacks. Required Authorization Not Obtained. Amex Cardmember Dispute Chargeback Reason Codes C02 — Credit Not Processed. Chargeback fees can start at US$25 and go up from there. Each reason code has its own set of regulations regarding: Proper and. ” Here the cardholder is. The new codes, which can be found in our reason code guide, start with a two-digit number indicating which of Visa's four dispute categories it falls into: 10 — Fraud; 11 — Authorization; 12 — Processing Errors; 13 — Consumer Disputes; The Visa Claims. Each of the major card brands, including Visa, Mastercard, and others, have their own system of reason codes. Here’s a look at the reason codes for the same scenario from the major credit card companies: Visa: Reason Code 30 Services not provided or merchandise not received. American Express chargeback reason code C05 falls under the “Card Member Disputes” category. It should ultimately help prevent fraud and unwarranted chargebacks, specifically applying to disputes marked with a Visa reason code 10. Chargeback time frames - A specific period during which a chargeback can be raised. Region. 16 Chargeback Reason Code 71 – Declined Authorization. The issuing bank reviews the information. M10 Vehicle Rental – Capital Damages. Reason codes are alphanumeric codes that provide the justification for granting a chargeback. R05 – Unauthorized debit to consumer account using Corporate SEC code. Check with the issuing banks to determine what time limits may apply to you. Amex uses the same four main categories as Visa to organize its reason codes: Authorization, Card Member Disputes (which Visa refers to as Consumer Disputes), Fraud, and Processing Errors. Then it chooses the most applicable code for a. UA02 Fraud – Card Not Present Transaction. R01 – Insufficient funds. MDR also retired reason code 4840 – Fraudulent Processing of Transactions. There are many reasons why a chargeback occurs, with over 100 reason codes listed across the major credit card brands. Chargeback Reason Codes for AMEX. Additionally, Amex uses a fifth "Miscellaneous" category. Card issuers are in the process of enrolling all cards issued to cardholders to participate in 3-D Secure. In simple terms, an Electronic Commerce Indicator (ECI) is basically a 3-D Secure response code. This extra step can be frustrating for Card Members and lead to lost sales. The ECI value tells you what to do next in a 3DS transaction — proceed, reject the purchase, or try again. This ranges anywhere from roughly 60 to 90 days after purchase. Visa groups its chargeback codes into four. If the merchant has a signature showing that the order was delivered, or evidence that the. For instance, if the customer claims unauthorized purchase, your letter should cite evidence, such as an IP address matching previous purchases, to support. Section5. Vendors that do not have a well-drafted shipping and order fulfillment policy are susceptible to this category of Shopify chargebacks. chargeback_settlement: The gross shows negative if the chargeback was resolved in the buyer's favor, and the funds return to the buyer. Visa has recently announced changes to its chargeback rules. France saw a drop of roughly 50% during the same period. You must tailor your representment case — including the compelling evidence — to the reason code under. It was originally just one facet. UA02 Fraud – Card Not Present Transaction. S. 800. Amex: A02: No Authorization/Invalid Approval Code: 120: Authorization: Amex: A08: Authorization Approval Code Expired: 120: Authorization: Amex: C02: Credit Not Processed: 120: Cardholder. What is the chargeback representment process? When faced with a chargeback representment, you should take these steps. It is associated with a chargeback reason code, and it is specific per Card Scheme. C02: Credit not processed: C04: Goods / services returned or. In simple terms, Mastercard Chargeback Reason Code 4859 — No Show/Addendum/ATM Dispute refers to situations where a customer claims the services purchased from a merchant were not fulfilled. 99. We want to clarify: this doesn’t imply that a transaction ID can reliably prevent chargebacks and fraud. The following chargeback reason codes are related to EMV: Visa: 10. Chargeback Reason Codes 62 and 4862 are issued when a merchant fails to compare the first four digits of the embossed account number on the card with the pre-printed digits below the embossed number for a card-present transaction or receives an authorization without the transmission of the entire magnetic stripe. About American Express chargeback reason codes. What Are the Different Chargeback Reason Codes? There are over 100 chargeback reason codes. Chapter 6 Pre-Arbitration and Arbitration Case Filing-For Chargebacks Initiated On or After 17 July 2020 > Time Frames and Requirements > Dual Message System Pre-Arbitration andVisa reason code 53 is used for Chargeback for Defective/Not as Described, and reason code 85 is used for Credit Not Processed. R07 – Authorization revoked by customer. Reason Code North-America: Canada and United States of America; Reason Code: All other countries;. For example, suppose a cardholder filed a case about an order processing issue, and you disputed the chargeback. information, including correct routing number, e. When a card is declined, it is in your best interest to accept that answer and either cancel the transaction or ask for a different form of payment. The chargeback transfers funds from the acquirer to the issuer. Consider using all the tools available to you—including Visa Secure, card security code (CVV2), and Address Verification Service (AVS). Click the Update Chargeback link to edit the chargeback details. 975. Step 1: The cardholder disputes a charge. If you get a chargeback,. R03 – Unable to locate account or no account. A chargeback happens when a customer requests for a transaction to be reversed. Cardholder-Activated Terminal (CAT) 3 Device. Fraud filters are tools you can add to your e-commerce website to prevent potentially fraudulent orders from processing in your. Chargeback Reason Codes by Industry. Your first step is to identify the chargeback reason code, which is a kind of shorthand that indicates why the transaction is being disputed. 1. 634. Discover. Refocus on the Customer Experience. 2. C02: Credit Not Processed: C04: Goods/Services. This code is used when a cardholder claims that a fraudulent transaction occurred in a face-to-face environment, such as a retail store. When customers dispute charges to their accounts, you can incur chargebacks. The bank or credit union then conducts an investigation to ascertain the validity of the dispute. Chargeback reason code 4853 can be used to indicate disputes where the cardholder simply claims that the merchant never delivered on what was promised. Complete Listing of Check 21 Return Codes. 10. The cardholder was expecting a full or partial credit from the merchant that. It also regulates the way banks must respond to consumer complaints and sets limits on liability for lost or stolen debit cards. Duplicate Processing - 81“Visa has 28 different reason codes. For best results, your chargeback win rate should be as close to 100% as possible. Updated Visa Reason Codes. 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. While you obviously don’t want customers to cancel their service, a cancelation is far better than a chargeback. Step 4: Card Network Collects Dispute Information. Discover: Reason Code 4755 Non-receipts of goods or services. This is your chance to send . CB CD (chargeback reason code) Enter the code that identifies the reason that a chargeback was generated for an invoice during receipt entry. Include any terms relevant to the transaction, including return, cancellation and. Category: Description. You can see a reason code 11. You must tailor your representment case — including the compelling evidence — to the reason code under. The newer system is designed to. Therefore, the issuer may submit a chargeback for a Payment Transaction using the message reason code 4842 before the 30-calendar day presentment time frame normally required for this message reason code. C14 – Paid by Other Means. Please refer to chapter 5 for more information. Scenario 1 — upfront chargeback. This does not include an AuthorizationIf the dispute involves a non-Visa card, the dispute can be paused for up to 72 hours for the merchant to respond. Credit not processed for cancelled or returned goods and services 2. Here’s how your store can prevent and deal with chargebacks. The shorthand description is “Canceled Recurring Billing. Card Type Reason Code Reason Text Chargeback Category Preventable Reversible VISA 30 Services Not Provided or Merchandise Not Received Non-Receipt of Goods. The use of this reason code indicates that the cardholder does not recognize the transaction as it appears on their bank statement. Here are some chargeback reason codes by card type. All ACH return reason codes consist of the letter “R” followed by two. Merchants who believe they have received an invalid chargeback under reason code 11. 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 American Express Chargebacks / Disputes. The assigned chargeback reason code outlines why a customer submitted the dispute. Additionally, Amex uses a fifth "Miscellaneous" category. Or contact your account manager. It's essential to respond within the. It depends on the chargeback reason code associated with the dispute. message. 105. Request for Information. Mastercard also considers some chargeback reason codes to be indisputable. If you're contesting a chargeback, you'll need solid evidence. Some 90% of merchants said “cardholder abuse of the chargeback process” was a leading concern for their business. There is a USD 25 limit for the First Chargeback (Reason Code 22). If the policy is on the front of the receipt, it should be near the customer signature line. Status: Status Details: Disputing on Your Behalf. 3? Visa chargeback reason code 11. You’re fighting Chargebacks with everything you have. The implication is that the merchant is at fault. C02 – Credit Not Processed; C08 – Goods/Services Not/Partially Received; Discover. This means that it will require merchants to provide evidence supporting their claim that a transaction was authorized by the cardholder. R06 – Returned due to ODFI’s request. FAQ: What remains Chargeback Representment? TIPS. 1. This means the cardholder claims that they received goods or services that were substantially different from what the merchant described. Check the chargeback reason code. Valid Values/Format: 22 - First Chargeback Handling Fee. There are 151 chargeback reason codes across the four major card networks. Values are: Blank: Use the receipt G/L date. The merchant did not receive any returned merchandise. C02: No Credit Received: A credit has not been applied to cardholders account for either: goods/services. 4853 – Cardholder Dispute – Digital Goods Purchase of $25 or Less. List of NACHA ACH Return Codes. EMV has been a mostly global standard since 2004. Visa also overhauled its system of chargeback reason codes. Click on “report a problem” and select the transaction in question. There are two parts to this. Under Set Order Status, select None, Refund, or Chargeback. Using the same link provided above, contact PayPal to report the scam. Betty's issuing bank assigned chargeback reason code 10. Chargeback reason codes vary by the credit card company. C02: Due to merger or consolidation, a once valid transit/routing number must be changed. 4853 – Cardholder Dispute – Credit Not Processed. Example: 25. This is commonly caused by either true fraud or friendly fraud. 1. ) A no-nonsense summary of evidence that proves transaction is legit. Build & Submit a Representment Case in 4 StepsFurther information at page PSR-564, 11. The list of chargeback reason codes in this article is organized by card brand and type of dispute. Other reason codes address entirely understandable reasons for cutting a merchant off from their credit card processor, like participating in money-laundering schemes, colluding with other merchants to fix prices or. Poor order fulfillment: Late order fulfillment or billing for an order before shipping the goods. Fraud: Fraudulent Transaction: P08: Processing Error: Paid By Other. Card Type Reason Code Reason Text Chargeback Category Preventable Reversible VISA 30 Services Not Provided or. Another thing you should bear in mind is that the card brand involved in the dispute can also change the reason code to suit new developments. Expedited Dispute Resolution forms will not be allowed. We’ll make a decision about reversing the Chargeback. Unauthorized returns (R05, R07, R10, R29, R51): 0. paper processing and mailing costs. Below is a list of Mastercard chargeback codes used in eCommerce. The Time Frame charts in this guide indicate the reason codes, allowable time frames for chargeback processing and type of chargeback. Nevertheless, you must respond to the chargeback based on the given code. Other Fraud—Card Absent Environment. The terminal action codes are in Table 122 of the 4. 5 Visa Fraud Monitoring Program. com. Amex Dispute Codes 2 address the specific dispute reason with the documents you send. The actual underlying cause of this chargeback is. With the implementation of Visa Claims Resolution, reason code 98 eventually became obsolete. ”. Take the time to note the following dispute reason codes for Visa. Improve chargeback-resolution time. If you choose to fight the chargeback, Amazon Pay will charge you a $20 Disputed Chargeback Fee. 1 Chargebacks A chargeback is a rules-based mechanism, with time-sensitive workflows, that enables the issuer and the acquirer to determine the financial liability of a disputed transaction. This definitive guide comes that chargeback reason codes from jeder of of four majority card networks. Payment Capture. Compelling evidence for fraud chargeback reason codes: • Proof that Verified by Visa was utilized by the merchant and 3DS authentication was obtained (ECI 5/6, UCF 1/2) for the disputed electronic commerce transaction. 0 represents the first rules change of its kind that specifically provides merchants with the opportunity to reverse the fraud status applied to a transaction associated by reason code 10. It’s even more frustrating if you don’t understand what the chargeback code means. Time Frames by Chargeback Type and Reason Code. Chargeback Reason Codes > Chip Liability Shift > Issuer Chargeback > Chip Liability Shift Program for Domestic and Intraregional Transactions Chapter 5—Compliance Case Filing Incorporated the changes announced in “AN 1677—Revised Standards—QuestionableSurvey 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. With an eCommerce transaction, 3-D Secure technology works like an online PIN code. chargeback_settlement: The gross shows negative if the chargeback was resolved in the buyer's favor, and the funds return to the buyer. It’s a 3-digit alphanumeric shorthand attached to a returned ACH transaction explaining why an ACH transfer is reversed. Examples of compelling evidence that you may submit in response to a chargeback with this reason code include: Proof you submitted the card security code with the authorization request and the issuer authorized the transaction, even if the code was a mismatch or the code wasn’t verified. If one of your customers issues a chargeback through their bank, you have the chance to dispute it and win back the funds. Code description a01 charge exceeds authorization. Whenever a chargeback is initiated, a code is passed through from the issuing bank that gives a reason for the dispute. This definitive guide includes the chargeback ground codes by each the the four main card wired. ” Here the cardholder is claiming that you were supposed to provide them with a refund, but no credit has been applied to their account. The following are reason codes for the same scenario: Visa: Reason Code 30 Services not provided or merchandise not received. 3 is the less common version for card-present transactions. For card-present transactions, clearly disclose the cancellation policy on the transaction receipt. Fight; Prevent; Recover; Predict; Success Story; Resources. C04 – Goods / Services Returned or Refused. Here’s a look at the reason codes for the same scenario from the major credit card companies: Visa: Reason Code 30 Services not provided or merchandise not received. FIGHT What compelling evidence is needed to respond? AMEX CODE A08 (Chargeback) CATEGORY Authorization AMEX CODE C02 (Chargeback) CATEGORY Authorization DESCRIPTION Authorization Approval Expired What it means The authorization has expired before the transaction was submitted. g. C31 – Goods / Services Not As Described. R06 – Returned due to ODFI’s request. ACH return codes and explanations for R01 – R33 returns. Categories For Reason Codes. 4853 – Cardholder Dispute – Credit Not Processed. Technical. FAQ: What is Chargeback. If the CID doesn’t match, merchants generally prompt the Card Member to re-enter it. 7: Defective goods and. Question: How soon after I submit a pr enotification can I submit a live entry (debit or credit)? These chargebacks occur to resolve chargeback-related disputes between network members. The claim often, but not always, involves automated teller machines (ATMs). Vantage HouseChargeback Reason Codes. Complaint reason_code values include: not_as_described: The buyer claims that the goods or services received differ from the merchant's description of the goods or services. These disputes are commonly referred to as friendly fraud. Unlike your response to other chargeback types, which is mostly determined by the particular circumstances and may require taking different actions, your response to a Reason Code 75 is quite. In this instance, the cardholder claims a misrepresentation of the order they received, such as a defect, damage, counterfeit, or incomplete merchandise. The case is now closed. Dec 6, 2021 — Betty's bank issued the chargeback for $9. Chargeback management describes all of the ways in which merchants can deal with fraud and disputes that result in payment reversals. Like traditional chargeback reason codes, an ACH return code indicates why the RDFI initiated the transaction reversal request. Cardholders can find loopholes in chargeback process, including illegal use of reason code C02 to their advantage.