code: func (p *ProjectsClient) GetTree(ctx context.Context, orgID *identity.ID) ([]ProjectTreeSegment, error) {
  	v := &url.Values{}
  	v.Set("org_id", orgID.String())
  
  	var segments []ProjectTreeSegment
  	err := p.client.RoundTrip(ctx, "GET", "/projecttree", v, nil, &segments)
  	return segments, err
  }
docs: // GetTree returns a project tree