curl -X GET "https://staging-api.loyalty.lt/en/shop/categories" \
  -H "X-API-Key: your_api_key" \
  -H "X-API-Secret: your_api_secret"

{
  "success": true,
  "code": 200,
  "request_id": "550e8400-e29b-41d4-a716-446655440000",
  "data": [
    {
      "id": 1,
      "name": {
        "lt": "Gerimai",
        "en": "Beverages"
      },
      "slug": "beverages",
      "parent_id": null,
      "children": [
        {
          "id": 2,
          "name": {
            "lt": "Kava",
            "en": "Coffee"
          },
          "slug": "coffee",
          "parent_id": 1
        },
        {
          "id": 3,
          "name": {
            "lt": "Arbata",
            "en": "Tea"
          },
          "slug": "tea",
          "parent_id": 1
        }
      ]
    }
  ]
}