R4J - Get folder structure via REST API 2

[Franz Schwarzenböck]

Dear Community, 

I´m want to get the requirement tree structure with it´s issues in R4J via REST API. Unfortunately all ways I found in the web were not successful. Accessing special issues, e. g.
.../rest/api/2/issue/SIA-1... works fine. I searched also the following references and got no working version for me. 

https://docs.atlassian.com/software/jira/docs/api/REST/8.22.3/#project-getProjectComponents

https://easesolutions.atlassian.net/wiki/spaces/REQ4J/pages/498270209/REST+API+Tree+Folders

Has anybody a suggestion? Is there something in sense .../rest/api/2/tree/{project key}   ? 
Or does anyone know a further reference? 

Thanks all!

[Edmer John Sarmiento]

Hi @Franz Schwarzenböck

I'm Edmer from EaseSolutions, vendor of R4J plugin.

I would like to confirm if you’re using R4J Server/Data Center or R4J Cloud version?

If you're using  R4J Server/Data Center, you may use the following R4J 2.0 REST APIs: https://easesolutions.atlassian.net/wiki/spaces/REQ4J/pages/1473937542/REST+API+2.0+Reference

To get the complete tree structure with or without issues from the root folder in the tree.

/2.0/projects/{projectKey}/folders

To get the complete tree structure with or without issues from a specific folder in the tree.

/2.0/projects/{projectKey}/folders/{id}

If you're using  R4J Cloud, you may use the following: R4J Cloud REST API: https://easesolutions.atlassian.net/wiki/spaces/R4JC/pages/2251948033/easeRequirements+Cloud+REST+API+Reference

To get Tree Item(s)
/1/tree/projects/{projectKey}/items/{idOrJiraIssueKey}

Best regards,

Edmer