Decline Code 13: Invalid amount

The decline code “13: Invalid amount” in a credit card transaction indicates that the amount entered for the transaction is invalid. This could be because the amount is either too high or too low, possibly falling outside of the permitted transaction limits set by the merchant or the card issuer. It might also be due to entering the amount in an incorrect format (such as including non-numeric characters or too many decimal places). To resolve this issue, the person attempting the transaction should double-check the amount being entered and ensure it adheres to the required format and limits.