Detect user response incident email and trigger CPM PHP curl to call web service

Summary

Tigger PHP c

Content

I am new to RNT and try to detect user response incident email and trigger CPM  to call web service. I am using PHP to get the change in an incident when user response email in the thread automatically without customer service representation involves by checking the old and new thread to see if there is any change. See code below. I already verify curl_exec() works for soap request on my service.

Q1) Do you think above will work to detect user reply incident email?

Q2) I use Execute Async option, will above automatic retry if curl_exec() fail to connect remote server?