Re: Event option and change of config

I think you should have sevices ip-monitoring instead of event options:

set services ip-monitoring policy PING-A-1 match rpm-probe Probe-Payment-Server
set services ip-monitoring policy PING-A-1 then preferred-route route 8.8.8.8/32 next-hop 10.10.10.2

https://www.juniper.net/documentation/en_US/junos/topics/example/ip-monitoring-security-configuring.html