curl --request GET \
  --url https://api.slash.com/merchant-category \
  --header 'X-API-Key: <api-key>'

{
  "items": [
    {
      "id": "<string>",
      "name": "<string>"
    }
  ],
  "metadata": {
    "nextCursor": "<string>",
    "count": 123
  }
}