Discover Payment Decline Code
Discover Decline Code 64: Original Amount Incorrect
Category Invalid Payment DataRetry Guidance Conditional Decline (Editorial Classification)By Payment Defender Editorial TeamUpdated July 17, 2026Last reviewed July 17, 2026
What Discover Decline Code 64 Means
Discover decline code 64 (Original Amount Incorrect) indicates that the original transaction amount is incorrect for this request.
Where the Response May Come From
Code 64 means the amount does not match the original transaction it references, common in adjustments, reversals, or completions. It concerns amount consistency in the request, so your transaction records are the reference.
Common Reasons for This Response
Common causes include a mismatch between the original and submitted amount in a related transaction.
Should the Merchant Retry the Payment?
A retry succeeds only once the amount is aligned with the original transaction; resubmitting a mismatched amount returns code 64 again.
Recommended Merchant Action
Reconcile the amount against the original authorization or transaction, correct the mismatch, and then resubmit.
What to Tell the Customer
Ask the customer to confirm the amount if relevant, and try again once the correct amount is used.
How to Reduce Similar Payment Failures
Auditing adjustment and reversal flows for amount mismatches helps prevent code 64 in transactions that reference a prior amount.
Important Limitations
Decline-code meanings vary by processor, gateway, and payment environment, and issuers do not always disclose the specific reason behind a response. The retry classification on this page is Payment Defender editorial guidance, not an official network rule. Merchants should confirm handling with their processor or gateway.
Related Decline Codes
Sources and Review Information
Last reviewed July 17, 2026
Raw network-response codes are supplemental to the complete processor or gateway response. Meanings and recommended actions can vary by issuer, processor, gateway, card network, payment method, region, and merchant configuration.