curl --request POST \
  --url https://api.journeybee.io/v1/pricing-calculators/{uuid}/fields \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "label": "<string>",
  "variable_name": "<string>",
  "required": true,
  "field_config": {},
  "sort_order": 123
}
'

{
  "uuid": "<string>",
  "label": "<string>",
  "variable_name": "<string>",
  "required": true,
  "sort_order": 123,
  "field_config": {
    "min": 123,
    "max": 123,
    "step": 123,
    "default": 123,
    "options": [
      {
        "value": "<string>",
        "label": "<string>",
        "priceModifier": 123
      }
    ],
    "defaultChecked": true
  },
  "created_at": "<string>",
  "updated_at": "<string>"
}