Issuing decline codes indicate why the issuer declined a transaction. They help merchants and acquirers diagnose transaction failures and provide guidance on how to retry or otherwise address the issue.
Common reasons for Issuing declines include:
- Authentication failures, for example due to incorrect details or process issues
- Security concerns, for example suspected fraud or unauthorized transactions
- Policy violations, for example exceeding limits
- Technical issues, such as network outages or processing errors
- Insufficient funds
- Card restrictions, for example on certain merchant categories