How to send Jira active users to Splunk ?

[Bhanu Prakash]

Disclaimer: Long and detailed Question. 

Scenario: 
We would like to send Jira Cloud Active users to Splunk. Note this is for Jira Cloud only

Restrictions we have: 

1. Cant use apps which cost additional cost to company. 
2. Cant user apps which does not have a bug bounty enabled on it. 
3. Cant provide access splunk folks as site admin to pull users via API. 

Question: 

How can i fetch Jira Cloud users and send the information to Splunk ?