{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "title": "Card Response",
  "description": "Details of the payment card.",
  "type": "object",
  "properties": {
    "last_4_digits": {
      "description": "Last 4 digits of the payment card number.",
      "type": "string",
      "example": "3456",
      "maxLength": 4,
      "minLength": 4,
      "readOnly": true
    },
    "type": {
      "$ref": "#/components/schemas/CardType"
    }
  }
}