How to locate an API for creating RTC ticket
2 answers
https://jazz.net/wiki/bin/view/Deployment/CLMProductAPILanding is the landing page for all REST APIs. From there you can find pages that describe the Jazz Foundation process REST API that deals with project areas, and the EWM REST API pages that cover work items.
Community users are unlikely to know what you mean by "RTC 12P server".
I recognize your server name pattern. I know that your organization has created and uses a ton of automation. I would suggest to talk to your peers to get access to what they already have. The have worked with all the APIs David mentions in the link.
One tool that they also use is https://github.com/jazz-community/work-item-command-line which is based on the Plain Java Client Libraries/SDK. You don't want to reinvent the wheel, if you could use something existing.