Get the issue type hierarchy for a next-gen project. The issue type hierarchy for a project consists of: * *Epic* at level 1 (optional). * One or more issue types at level 0 such as *Story*, *Task*, or *Bug*. Where the issue type *Epic* is defined, these issue types are used to break down the content of an epic. * *Subtask* at level -1 (optional). This issue type enables level 0 issue types to be broken down into components. Issues based on a level -1 issue type must have a parent issue. **Permissions required:** *Browse projects* project permission for the project.

{
  "success": true,
  "data": {
    "id": "abc123",
    "created_at": "2025-01-01T00:00:00Z"
  }
}

{
  "success": false,
  "error": {
    "code": "VALIDATION_ERROR",
    "message": "Invalid request parameters"
  }
}

Get the issue type hierarchy for a next-gen project. The issue type hierarchy for a project consists of: * *Epic* at level 1 (optional). * One or more issue types at level 0 such as *Story*, *Task*, or *Bug*. Where the issue type *Epic* is defined, these issue types are used to break down the content of an epic. * *Subtask* at level -1 (optional). This issue type enables level 0 issue types to be broken down into components. Issues based on a level -1 issue type must have a parent issue. **Permissions required:** *Browse projects* project permission for the project.

{
  "success": true,
  "data": {
    "id": "abc123",
    "created_at": "2025-01-01T00:00:00Z"
  }
}

{
  "success": false,
  "error": {
    "code": "VALIDATION_ERROR",
    "message": "Invalid request parameters"
  }
}