curl "https://api.mercozy.com/api/v1/external/categories/tree" \
  -H "X-API-Key: mk_live_xxxxx"

curl -X POST "https://api.mercozy.com/api/v1/external/categories" \
  -H "X-API-Key: mk_live_xxxxx" \
  -H "Content-Type: application/json" \
  -d '{
    "name": "Electronics",
    "description": "Electronic devices and accessories",
    "sortOrder": 1,
    "isActive": true
  }'

{
  "data": [
    {
      "id": "cat_abc123",
      "name": "Electronics",
      "slug": "electronics",
      "description": "Electronic devices and accessories",
      "parentId": null,
      "imageUrl": null,
      "sortOrder": 1,
      "isActive": true,
      "children": [
        {
          "id": "cat_def456",
          "name": "Smartphones",
          "slug": "smartphones",
          "description": "Mobile phones",
          "parentId": "cat_abc123",
          "imageUrl": null,
          "sortOrder": 1,
          "isActive": true,
          "children": []
        }
      ],
      "createdAt": "2025-12-15T10:30:00Z",
      "updatedAt": "2025-12-15T10:30:00Z"
    }
  ]
}