Technical & Processing Errors
A system, connectivity, or formatting problem between the merchant, processor, network, and issuer prevented the transaction from completing.
Cannot Verify PIN
A "Cannot Verify PIN" decline means a technical failure prevented the issuer from validating the PIN entered, such as encryption key mismatches or a system outage — it is distinct from an incorrect PIN entry. The cardholder's PIN may be entirely correct; the issue lies in the verification process itself rather than the credential.
Technical & Processing ErrorsDuplicate Transaction
A "Duplicate Transaction" decline means the card network or issuer detected that this transaction matches another one already processed for the same card, amount, and time window, and is blocking it to prevent an accidental double charge. It is a protective control, not a fraud or funding issue.
Technical & Processing ErrorsError / Transaction Error
An "Error" or "Transaction Error" decline is a generic processing failure code the network returns when a request can't be completed due to a malformed message, an intermediate system glitch, or an unclassified problem. It doesn't indicate fraud or insufficient funds — it signals something went wrong in transmission or processing rather than a specific cardholder-related reason.
Technical & Processing ErrorsFinancial Institution Not Found
This decline means the routing information attached to the transaction couldn't be matched to a valid financial institution, often due to a BIN (bank identification number) table issue or a routing configuration error. It is a technical failure, not an indication of fraud or account problems.
Technical & Processing ErrorsFormat Error
A "Format Error" decline means the transaction message sent to the network was malformed — missing a required field, containing an invalid value, or structured incorrectly. It is almost always caused by a bug or misconfiguration in the merchant's payment gateway, POS, or integration rather than anything related to the cardholder.
Technical & Processing ErrorsInvalid Amount
An "Invalid Amount" decline means the transaction amount field failed validation — for example it was zero, negative, exceeded a formatting limit, or contained a currency mismatch. This is a technical or processing issue rather than a funds or fraud problem, and it typically requires the merchant or their gateway to correct how the amount is submitted.
Technical & Processing ErrorsInvalid Merchant
An "Invalid Merchant" decline means the merchant ID (MID) submitted with the transaction is not recognized, is inactive, or is misconfigured with the card networks. It is a technical/setup issue on the merchant or acquirer side, not a cardholder problem, and typically requires the merchant's payment processor to investigate and correct the account configuration.
Technical & Processing ErrorsInvalid Transaction
An "Invalid Transaction" decline means the transaction type, format, or combination of details submitted isn't supported for this card, terminal, or account type. It's typically a technical or configuration mismatch — such as attempting a transaction type the card doesn't support — rather than a fraud or funds issue, and often requires a corrected resubmission.
Technical & Processing ErrorsIssuer or Switch Inoperative
This decline means the card issuer's system, or the network switch routing the transaction to it, was temporarily unreachable or down when the authorization request was sent. It is not a reflection of the cardholder's account status and typically resolves once the issuer's systems come back online.
Technical & Processing ErrorsNo Such Issuer
A "No Such Issuer" decline means the card number's issuer identification number (the first six-to-eight digits, or BIN/IIN) doesn't match any recognized financial institution in the routing network. It usually results from a mistyped or mis-keyed card number rather than fraud, and the transaction cannot succeed until the correct card number is entered.
Technical & Processing ErrorsRe-enter Transaction
A "Re-enter Transaction" decline is a request from the issuer to resubmit the transaction after a transient error, such as a brief communication glitch, prevented normal processing the first time. It is not a true decline of the sale — most re-entered transactions succeed on the next attempt with no changes needed.
Technical & Processing ErrorsRequested Function Not Supported
A "Requested Function Not Supported" decline means the specific transaction type or feature requested — such as a particular refund method, cash advance, or account inquiry — isn't supported by the cardholder's issuer for that card. It reflects a capability mismatch rather than a funds or fraud issue and usually requires a different transaction approach.
Technical & Processing ErrorsResponse Received Too Late (Timeout)
A "Response Received Too Late" (timeout) decline occurs when the issuer's authorization response didn't arrive within the card network's required timeframe, so the transaction was automatically declined. It usually reflects a temporary network, connectivity, or system performance issue rather than any problem with the cardholder's account, and often succeeds on retry.
Technical & Processing ErrorsSystem Malfunction
A "System Malfunction" decline is a generic technical failure somewhere in the payment processing chain — hardware, software, or network — that prevented the transaction from being completed. It is unrelated to the cardholder's account status and usually clears up once the underlying system issue is resolved.
Technical & Processing ErrorsUnable to Locate Record
An "Unable to Locate Record" decline occurs when the issuer can't find the original transaction a follow-up message refers to, such as a capture, void, or reversal. It typically results from a timing mismatch, an expired authorization, or a reference number error rather than any issue with the cardholder's account.
Technical & Processing ErrorsUnsupported Currency
An "Unsupported Currency" decline happens when the transaction currency isn't accepted for the cardholder's account, card product, or cross-border corridor, and is returned to merchants as an Invalid Amount response. It's most relevant to merchants processing multi-currency or international transactions and typically requires charging in a supported currency instead.