I want to integrate my backend application with Jira Service Management. I am currently in a process of migrating from NoSQL database to Jira Assets. Unfortunately Jira does not support client_credentials flow (https://jira.atlassian.com/browse/OAUTH20-176).

What is then the best option for service to service communication?

I already have a full backend built in Java/Quarkus. So developing another application (Forge or Connect) does not make much sense. (Or does it?) So the only option is basic auth, using API token. But even on their documentation it says it is not quite secure option, and should not be used outside of simple scripts and manual calls.

Any advice?

Best,
Nikola