You will need to make a change to their sqlnet.ora file in your Oracle home directory (Under network\admin).
You need to add the following lines:
SQLNET.ALLOWED_LOGON_VERSION_SERVER=11
SQLNET.ALLOWED_LOGON_VERSION_CLIENT=11
CardExchange is using the client version 11 to connect, so you need to allow older clients to connect by adding these settings.
The Oracle data access components need to be installed manually, so you will need to download these from our website and install them.
Once done, you may also need to reset the password for the user account that CardExchange is using to connect, you can see some details in the oracle document here:
