curl --request GET \
  --url https://api.signa.so/v1/classifications \
  --header 'Authorization: Bearer <token>'

{
  "success": true,
  "data": {
    "classifications": [
      {
        "class": 23,
        "type": "goods",
        "heading": "<string>",
        "description": "<string>"
      }
    ]
  }
}