Retrieve and manage categories for directories through the Directify API.
GET /api/directories/{directory_id}/categories
directory_id
{ "data": [ { "id": 1, "title": "Web Development", "parent_title": null }, { "id": 2, "title": "Frontend", "parent_title": "Web Development" }, { "id": 3, "title": "Backend", "parent_title": "Web Development" } ] }