You can use many method for realize this purpose (SNMP, alerts, webhook etc.)
But very simple and right method - use SNMP Request.
You can use simple Request SNMPv3 Dashboard Controller for purpose monitoring device status (https://documentation.meraki.com/General_Administration/Monitoring_and_Reporting/SNMP_Overview_and_C.... This feature configuration for each Organization (Organization-Settings-SNMP Section). Also in SNMP Section you can search SNMPv3 connection parameters (login, configurable authentication and privacy passwords, port and supported protocols connection) to Meraki Controller for you account and you can download from this page specific MIB for upload to your Monitoring System.
I am currently use this method for monitoring device status for network devices (MX,MR,MS) in own Monitoring System (PRTG).