curl --request POST \
  --url http://localhost/api/v3/roles/definitions \
  --header 'Content-Type: application/json' \
  --data '
{
  "name": "<string>",
  "handle": "<string>",
  "description": "<string>",
  "short_description": "<string>",
  "icon": "<string>",
  "image_url": "<string>",
  "period": 123,
  "period_type": "days",
  "absolute_expiry": "<string>",
  "notes": "<string>",
  "group_name": "<string>",
  "group_handle": "<string>",
  "meta": [
    "<string>"
  ],
  "custom_fields": [
    {
      "namespace": "<string>",
      "handle": "<string>",
      "type": "string",
      "value": "<string>"
    }
  ]
}
'

{
  "data": {
    "id": 123,
    "name": "<string>",
    "handle": "<string>",
    "description": "<string>",
    "short_description": "<string>",
    "icon": "<string>",
    "image_url": "<string>",
    "timezone": "<string>",
    "period": 123,
    "period_type": "<string>",
    "absolute_expiry": "<string>",
    "group_name": "<string>",
    "group_handle": "<string>",
    "notes": "<string>",
    "meta": [
      "<unknown>"
    ],
    "custom_fields": {},
    "created_at": "<string>",
    "updated_at": "<string>"
  }
}