curl --request POST \
  --url https://openapi.pluuug.com/v1/estimate/item \
  --header 'Content-Type: application/json' \
  --header 'X-API-Key: <api-key>' \
  --header 'X-Signature: <api-key>' \
  --data '
{
  "title": "<string>",
  "unitCost": "<string>",
  "unit": "<string>",
  "description": "<string>",
  "classification": {
    "id": 123
  }
}
'

{
  "id": 123,
  "title": "<string>",
  "unitCost": "<string>",
  "unit": "<string>",
  "image": "<string>",
  "description": "<string>",
  "classification": {
    "id": 123,
    "title": "<string>"
  }
}