Is there some standard systemd script (sspcd.service) for CentOS 7.x that has to be run at startup to start CA API Gateway (/opt/SecureSpan/Gateway/runtime/bin/gateway.sh start) or does one have to be created?
API Gateway 9.3+
Try setting up a cronjob to start the gateway service after a reboot.
crontab -e
@reboot /opt/SecureSpan/Gateway/runtime/bin/gateway.sh start