This article provides a merchant’s essential guide to common credit card Error Codes, explaining that these confusing messages are actually vital instructions from the cardholder’s bank. Understanding the codes helps merchants avoid lost sales and chargebacks by responding appropriately—for example, knowing that “05 – Do Not Honor” requires the customer to contact their bank, while “51 – Insufficient Funds” simply requires an alternate card. The guide dedicates a section to the complex “Error 35 – Call Processor,” explaining it’s a general authorization failure often related to fraud flags or system issues, necessitating a call to the merchant processor. Nationwide Payment Systems (NPS) emphasizes its role as the human support system, offering 24/7 live assistance to troubleshoot technical, bank-side, or configuration errors and train staff.
By Nationwide Payment Systems – Your Partner in Seamless Payments
Common Credit Card Error Codes (and What They Really Mean for Your Business)
When you process credit cards—whether in-store, online, or through your POS—sooner or later you’ll see a confusing message like “Error Code 35 – Call Processor.”
These codes can frustrate business owners, but each one tells a story about what’s happening behind the scenes. At Nationwide Payment Systems (NPS), we’ve been helping businesses decode and fix authorization issues for over 20 years. Let’s break down the most common credit card error codes, what they mean, and how to respond quickly so you don’t lose a sale.
What Are Credit Card Error Codes?Every time you process a payment, your terminal or gateway sends a request to the cardholder’s issuing bank through your payment processor. If something goes wrong—fraud suspicion, expired card, wrong CVV, or system timeout—the network returns a specific error code.
Understanding these codes helps you:
Avoid unnecessary transaction retries.
Prevent future chargebacks.
Keep customers informed!
Know when to contact your processor (that’s us!).
Common Credit Card Error Codes ExplainedHere is a quick-reference table for the most frequently encountered authorization error codes:
| Code | Message | Meaning | What to Do |
| 05 |
Do Not Honor |
Issuer declined—no details given (often fraud filter or temporary block). | Ask the cardholder to contact their bank or use another card. Do not retry immediately. |
12 |
Invalid Transaction |
Something is wrong with how the transaction was formatted. | Check terminal setup or contact NPS support. |
| 13 |
Invalid Amount |
Amount is not valid or out of the acceptable range. | Verify the amount entered and retry. |
| 14 |
Invalid Card Number |
The card number entered is incorrect or doesn’t exist. | Re-enter card or verify manually. |
| 41 |
Lost Card – Pick Up |
The card has been reported lost. (Hard Decline) | Don’t process; request another card. |
| 43 |
Stolen Card – Pick Up |
The card was reported stolen. (Hard Decline) | Stop transaction; do not retry. |
| 51 |
Insufficient Funds |
The account doesn’t have enough balance or credit limit. | Ask for another payment method. |
| 54 |
Expired Card |
Card is no longer valid. | Request a different card. |
| 57 |
Transaction Not Permitted |
The card is restricted from use at this merchant type or for this transaction. | Ask customer to call their bank, or use another card. |
| 58 |
Transaction Not Allowed |
Your terminal or merchant account isn’t set up for this transaction type. | Contact NPS support immediately. |
| 61 |
Exceeds Withdrawal Limit |
Cardholder exceeded their daily or per-transaction limit. | Ask customer to call their bank. |
| 62 |
Restricted Card |
Card cannot be used at this merchant or for this purpose. | Contact NPS support for help. |
| 65 |
Exceeds Frequency Limit |
Too many transactions for this account in a short time frame. | Wait and retry later. |
| 91 |
Issuer Unavailable |
The card issuer’s system didn’t respond (often temporary). | Try again later or contact processor. |
| 96 |
System Malfunction |
Network or processor issue. | Call your processor for assistance. |
| 35 |
Call Processor |
General authorization failure—contact your processor. | Contact NPS support; may be a fraud flag or restriction. |
Why These Codes MatterThese messages protect both you and your customers. They help prevent fraud, chargebacks, and accidental duplicate charges. When you understand them, you can take faster action and provide smoother customer experience.
For example:
A “Do Not Honor” (05) might mean a fraud protection filter kicked in due to an unusual purchase pattern, not necessarily that the customer has bad credit.
“Call Processor” (35) could be a temporary block or a bank verification issue that only your processor can quickly diagnose.
What to Do When You See “Call Processor” (Error 35)Error 35 – Call Processor is one of the most common and confusing messages.
It means the issuer declined the transaction but did not provide a standard reason. The bank is requesting the card acceptor (you) to contact the acquirer (your processor). This could be:
A temporary system or network error.
A bank’s internal fraud filter flag.
A transaction outside the cardholder’s normal spending pattern.
Your next steps:
Do not retry immediately.
Ask the cardholder to contact their bank.
Call Nationwide Payment Systems Support to check your merchant setup or gateway logs.
We can quickly identify if it’s a bank restriction, a technical issue, or an account setting that needs adjustment.
Pro Tip: Train Your TeamMerchants lose thousands of dollars each year by retrying declined cards incorrectly (which can lead to higher fees or account review).
Train your team to read and respond to codes the right way. With NPS, you’ll have 24/7 live support—no bots, no waiting. We’ll walk you through what the code means, check the authorization response, and get you back to business.
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This means the issuer declined the transaction, and the processor must be contacted for details. It often indicates that information entered for the transaction was incorrect or incomplete.
The cardholder’s bank (the issuer) refused authorization. This is a general refusal often due to suspected fraud, insufficient funds, or the card exceeding its spending limits.
Generally, no. You should only retry after confirming the issue is resolved with your processor or the customer’s bank. Trying too many times can trigger a fraud block on the cardholder’s account, requiring them to call their bank to lift it.
The card number entered does not correspond to any valid account structure recognized by the payment network. You must verify the number and re-enter it carefully.
No. If the card has expired, you will receive an Error 54. You must request a new card from the customer.
This means the card itself is blocked from certain types of transactions (e.g., credit cards blocked from cash advances) or the merchant’s industry (SIC code) is not permitted by the card issuer.
It is typically a temporary communication delay, system overload, or outage at the card-issuing bank or between payment systems. Waiting a few minutes and trying again is sometimes effective.
The core meanings are generally the same, but E-Commerce (card-not-present) systems will also look for Address Verification Service (AVS), Zip Code, and Security Digits, which can generate additional specific decline codes.
If you are a Nationwide Payment Systems merchant, you should contact our dedicated 24/7 support team. We can pinpoint the exact cause of the decline based on the code provided by the processor.
Use up-to-date terminals, always verify billing information, and partner with a processor that actively monitors your approval rates. Factors like accurate SIC codes, clear descriptors, and optimized gateway settings play a crucial role in reducing declines.
The post Credit Card Error Codes Explained: Decline Codes & What Merchants Should Do Now appeared first on Customized Payment Processing Solutions.
