Error code
Card Network 55
CARD NETWORK55
Payment Decline Code· Why a card payment was declined by the issuer or processor, and what to do.
What it means
Incorrect PIN.
How to fix it
- Ask the customer to re-enter their PIN carefully.
- after repeated failures advise contacting their bank.
Not affiliated with Card Network. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.