How do I access all the issues in a Roadmap Plan in Jira Server

[Rahul Mittal]

Jira Server Platform v8.20.8

URL: jira.mycompany.com

Plugin: 

• Advanced Roadmaps for Jira v8.20.8
• Jira Agile v8.20.8

I'd like to fetch the list of Issues in a Plan in their sort rank using the REST API.

I know I can fetch issues for a board, but want to get the sort rank from the plan.

I have already looked at Portfolio for Jira - Public API | API Reference (atlassian.com) and Jira 8.20.8 (atlassian.com)

[Carla Ann Rowland]

Roadmaps contains only the issues from a project or board filter so you could use the same filter in api call or reference same project key

[Rahul Mittal]

Yes, but I am stack ranking the issues in the roadmap plan which I can't get in a project or board filter. I am looking for the rank order for prioritization.