Card restrictions: The card is not allowed for certain transaction types (e.g., online, international, or recurring).
Issuer policy: The bank's internal rules prevent the transaction, sometimes without disclosing the reason.
Account issues: The customer's account may have temporary holds, insufficient privileges, or security-related blocks.
Expired or inactive card: The card has expired or is no longer active for use.
Inform the customer that their bank is declining the transaction for unspecified reasons.
Ask the customer to:
Contact their bank for details regarding the decline.
Use an alternative payment method if the issue cannot be resolved immediately.
Internally:
Avoid retrying the transaction automatically without customer confirmation.
Provide support agents with a script or predefined message to assist affected customers effectively.