{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "#/components/schemas/SsnOrItin",
  "title": "SsnOrItin",
  "type": "object",
  "description": "Social Security Number or Individual Taxpayer Identification Number.",
  "properties": {
    "full": {
      "type": "string",
      "description": "Full 9-digit SSN or ITIN. Only provided on write; masked on read.",
      "pattern": "^\\d{9}$"
    },
    "lastFour": {
      "type": "string",
      "description": "Last four digits of the SSN or ITIN.",
      "pattern": "^\\d{4}$"
    }
  }
}