What does “Do Not Honor” mean? Causes and solutions

The 05 code is a standard ISO 8583 response that means the issuing bank has declined the transaction without providing a specific reason. It is the most common generic decline code in the payments industry.

You should not immediately retry the transaction with the same details, as this may look like fraud and lead to further declines. Ask the shopper to check their details or call their bank before attempting the payment again.

Not necessarily. It usually means the bank flagged that specific transaction as suspicious, but the card might still work for other purchases or after the cardholder confirms the activity.

Merchants can prevent these codes by sending comprehensive transaction data, including AVS and CVV info, and by using modern authentication protocols like 3D Secure 2.