We have a log management option in PAX , you can enable it as below. The LogManagement class will create a log file ('logmanagement.log') in the home directory. This log file will capture all transaction request and response messages, the location and log file name are customizable.
$config = new ConnectionConfig();
$config->ipAddress = '192.168.42.219';
$config->port = '10009';
$config->deviceType = DeviceType::PAX_S300;
$config->connectionMode = ConnectionModes::HTTPS;
$config->timeout = 10;
$config->requestIdProvider = new RequestIdProvider();
$config->logManagementProvider = new LogManagement();