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

{
  "success": true,
  "data": {
    "class": 123,
    "type": "<string>",
    "heading": "<string>",
    "description": "<string>",
    "common_terms": [
      "<string>"
    ]
  }
}