Error code
Card Network 30
CARD NETWORK30
Payment Decline Code· Why a card payment was declined by the issuer or processor, and what to do.
What it means
Format Error.
How to fix it
- Verify that the payment request is correctly formatted.
- contact your payment processor if the issue persists.
Not affiliated with Card Network. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.