1. Copy the scripts and SSL configuration to zabbix external scripts directory: /usr/lib/zabbix/externalscripts
2. Add domains to the configuration file: ssl/sslCertDomains.json
3. Create zabbix host and link with SSL template, add macro to the host: {$DOMAIN_GROUP}, macro value should match the group name in the SSL configuration file.
4. Create a cron job to send data to the zabbix host, see description in "sslCertExpiryCheck.sh"