Postman + Jira - Check for when users are added to a group

I am very new to postman, and today was the first time I got to handle requests to add people to groups in Jira. I was able to figure out the process to add bulk users to a specific Jira group.
The issue I’m having is, I want to be able to use postman as a monitoring tool for every time a user gets added to a group postman will run some sort of scheduled task and alert me over email.My question:

I would appreciate some suggestions.