When manually entering a customer's credit card over the phone, it's not uncommon to encounter errors due to security protocols, gateway-specific requirements, or input issues. Below is a breakdown of the most common issues across major payment gateways and where to find their complete error documentation.
1. Authorize.net
Common Errors
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E00027 – Invalid credit card number.
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Usually due to a mistyped card number or unsupported card type.
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E00003 – The 'x_card_num' field is required.
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Indicates the card number field was left blank.
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65 – This transaction was declined.
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Often related to card limits or restrictions set by the issuer.
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78 – The card has expired.
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Verify the expiry date entered.
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Full Error Code List:
Authorize.net Response Reason Codes
2. Braintree by PayPal
Common Errors
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91706 – Credit card number is invalid.
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Usually a formatting error or invalid Luhn checksum.
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81701 – Credit card has expired.
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Check expiry date input.
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91565 – Cannot use a payment method once it has been declined.
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Card has been marked as permanently declined.
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91564 – Processor declined.
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General decline by the card issuer. Try a different card.
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Full Error Code List:
Braintree Error & Validation Codes
3. Stripe
Common Errors
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incorrect_number – The card number is not a valid credit card number.
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expired_card – The card has expired.
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card_declined – The card was declined.
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Can include additional
decline_code
likeinsufficient_funds
orstolen_card
.
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processing_error – An error occurred while processing the card.
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Usually a temporary issue on Stripe or the issuer side.
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Full Error Code List:
4. NMI (Network Merchants Inc.)
Common Errors
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200 – Transaction was declined by the processor.
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220 – Invalid credit card number.
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222 – Invalid expiration date.
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240 – Call issuer for further authorization.
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Often means the customer must contact their bank.
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Full Error Code List:
5. USAePay
Common Errors
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10112 – Invalid card number.
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10113 – Invalid expiration date.
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10114 – Card has expired.
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10107 – Transaction declined by issuing bank.
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Can happen due to suspected fraud or insufficient funds.
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Full Error Code List:
6. Square
Common Errors
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CARD_DECLINED – The card was declined.
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VERIFY_CVV_FAILURE – CVV failed verification.
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INVALID_CARD – The card number is invalid.
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EXPIRED_CARD – The card has expired.
Full Error Code List:
General Tips
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Always double-check: Number, expiry, CVV, and billing ZIP.
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Use the exact name on the card to avoid verification mismatches.
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Be cautious with repeated attempts — multiple failures can cause the gateway or issuer to block the card.
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Use gateway logs or the merchant dashboard to review the precise error returned.
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Ask the customer to contact their bank if the issue is persistent or unclear.