What Discover Reason Code IC Means
Discover reason code IC — Illegible Sales Data is a processing error dispute that occurs when Discover requested transaction documentation — typically a sales receipt or order record — and the document provided was illegible, unreadable, or of insufficient quality to process.
IC is unusual among chargeback reason codes: it is not triggered by a cardholder dispute about the transaction itself, but by a document quality failure in the retrieval or chargeback response process. A cardholder or issuer requests transaction documentation, the merchant submits a response, and the evidence submitted is too blurry, faded, incomplete, or low-resolution to read. The underlying transaction may have been entirely legitimate — the chargeback arises from the quality of the documentation.
IC disputes are entirely preventable. The transaction itself may have been legitimate — the chargeback arises from submitting unreadable evidence. Merchants who maintain high-quality transaction records and submit legible, complete documentation will not receive IC chargebacks.
Cross-Network Equivalent Codes
| Network | Code | Title | Notes |
|---|---|---|---|
| Discover | IC | Illegible Sales Data | This page |
| Visa | 11.2 | Declined Authorization | Visa may use this code when documentation quality prevents processing |
| Mastercard | 4834 | Point of Interaction Error | Mastercard's general processing error code for documentation issues |
| Amex | R13 | No Reply | Amex uses R13 when merchant fails to provide adequate documentation |
Common Trigger Scenarios
- Thermal receipt paper faded beyond legibility — Thermal paper receipts fade significantly over time, especially if stored in warm or humid conditions. A receipt that was readable at transaction time may be illegible months later when needed for a dispute.
- Low-resolution scan submitted — A receipt scanned at insufficient resolution (under 200 DPI) produces a blurry image where critical details — amount, card number, date, signature — are unreadable.
- Photographed receipt with poor lighting or angle — A receipt photographed with a smartphone in poor lighting, at an angle, or with glare becomes difficult or impossible to read, especially for fine print.
- Ink ribbon or printer issue — A POS printer with a worn ink ribbon or malfunctioning thermal print head produces light, patchy, or incomplete receipts from the time of transaction.
- Cutoff or incomplete document scan — A receipt scanned without the edges results in a document with missing data — a partial amount, an incomplete card number, or a cut-off signature line.
Key Deadlines & Timeframes
| Milestone | Timeframe | Notes |
|---|---|---|
| Cardholder Filing Window | 120 days | From the transaction date |
| Merchant Response Window | 30 days | From dispute notification; confirm with your processor for internal deadlines |
| Pre-Arbitration | 30 days | If Discover rejects representment, 30 days to escalate |
Evidence You Will Need
- Legible receipt resubmission — If the IC chargeback is still within the pre-arbitration window, submit a clear, legible copy of the original receipt — scanned at minimum 300 DPI, full document, all text readable
- Electronic transaction record — If the physical receipt is unreadable, substitute an electronic transaction record from your POS or payment gateway showing the transaction details — amount, date, card number (last four), and authorization code
- Authorization record — The authorization approval record from your payment processor confirming the transaction was properly authorized, as a supplement to any receipt issues
- Order record or invoice — For CNP transactions, the original order record or invoice from your system showing the transaction details at the time of purchase
Access the Documentation Standards Guide
Our processing errors guide covers IC documentation standards, receipt archiving best practices, and how to set up your dispute portal submissions to avoid illegible document rejections.
Access the Documentation Standards Guide →How Merchants Lose This Dispute
- Submitting a blurry photograph of a receipt — A smartphone photo of a paper receipt is usually insufficient quality for dispute documentation. Scan receipts with a flatbed scanner or high-quality document scanner.
- Relying solely on thermal paper originals — Thermal paper fades. Do not store only the original thermal receipt for dispute documentation — scan and archive digital copies of receipts at the time of transaction.
- Exceeding document file size limits — Heavily compressed documents submitted to acquirer portals may be degraded to the point of illegibility. Check the portal's file size requirements and optimize accordingly.
- Missing the resubmission window — If the IC chargeback can be corrected by resubmission, missing the pre-arbitration window means the illegible document stands and the chargeback is final.
Response Framework Overview
- Locate the original transaction documentation. Find the clearest available version of the receipt or transaction record — check your POS system for electronic records, which are typically more legible than scanned paper.
- Rescan at high resolution. If the original is paper, rescan at minimum 300 DPI on a flatbed scanner. Ensure the full document is captured with no cutoff edges.
- Substitute electronic records if receipt is unreadable. If the paper receipt is too degraded, use your payment gateway or POS system's electronic transaction record as the primary evidence.
- Resubmit through your acquirer immediately. Contact your acquirer to determine if resubmission is possible through the pre-arbitration process. Time is critical — do not delay.
Prevention Tips
- Scan and archive receipts digitally at transaction time — The most effective IC prevention: scan all paper receipts and store them digitally at minimum 300 DPI immediately after the transaction. Do not rely on aging thermal paper for future dispute documentation.
- Use electronic receipt systems — Electronic receipts stored in your POS or payment gateway are always legible and easily retrieved. Moving to electronic receipts eliminates thermal paper degradation as an IC risk.
- Store thermal receipts properly — If you must store paper receipts, keep them away from heat, humidity, and direct light. Store in a cool, dry location in archival-quality envelopes to extend legibility.
- Test your document submission format — Before your first retrieval request arrives, test submitting a sample receipt to your acquirer's dispute portal to verify the format, resolution, and file size produce a legible result.
Frequently Asked Questions
What is Discover reason code IC?
Discover IC (Illegible Sales Data) is issued when a merchant submits transaction documentation — typically a sales receipt — in response to a retrieval request or chargeback, but the document is too blurry, faded, or incomplete for Discover to process it.
How do I prevent Discover IC chargebacks?
Maintain original transaction records at adequate resolution and quality. When responding to retrieval requests, scan or photograph receipts clearly — minimum 300 DPI, all text legible, no cutoff edges. Test your document submission format before the deadline.
Can I resubmit better documentation after an IC chargeback?
In some cases, yes. Contact your acquirer immediately to determine whether the IC chargeback can be resolved by submitting legible documentation through the pre-arbitration process. Do not assume the IC chargeback is final without checking.
What documentation format does Discover require?
Discover typically accepts PDF or image format documentation. Files should be under any size limit specified by your acquirer's portal, minimum 300 DPI resolution, with all text fully legible and no cropped or cut-off sections.