Discover Payment Decline Code
Discover Decline Code 13: Invalid Amount
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 13 Means
Discover decline code 13 (Invalid Amount) indicates that the transaction amount is invalid, missing, or outside acceptable values.
Where the Response May Come From
Code 13 indicates the submitted amount is unacceptable to the issuer, such as a zero, negative, or out-of-range value. Because it concerns the amount field in the request, the processor response and your transaction data are the reference for resolving it.
Common Reasons for This Response
Common causes include a zero or negative amount, a mis-keyed value, or an amount outside the card program's accepted range.
Should the Merchant Retry the Payment?
A retry can succeed once the amount is corrected to a valid, in-range value; resubmitting the same amount that triggered the response will return code 13 again.
Recommended Merchant Action
Check the transaction amount for keying errors, currency formatting, or program limits, correct it, and then reattempt the charge.
What to Tell the Customer
Ask the customer to confirm the purchase amount and their payment details, then try the transaction again.
How to Reduce Similar Payment Failures
Validating amount formatting and program limits at checkout and monitoring code 13 by integration point helps eliminate avoidable amount-related declines.
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.