Certificate related files are stored in the SD-card folder ExternalPayUnits\Certificates
The filename is constructed of the host address and park id. The file extensions have the following meaning:
.crt Contain the certificate with the server’s public crypto key
.csr Certificate Sign Request file containing the terminal’s public crypto key.
.key Contain the terminal’s private crypto key used when handshaking with the server.
The “usedAuthToken.txt” is a file containing a token that was successfully used to retrieve a certificate and is renamed so it’s not used again during the startup of the terminal. The file is left for tracking reasons.
