Error code
Card Network 15
CARD NETWORK15
Payment Decline Code· Why a card payment was declined by the issuer or processor, and what to do.
What it means
No Such Issuer.
How to fix it
- Ask the customer to verify the card number and try again.
- use a different card.
Not affiliated with Card Network. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.