{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "type": "object",
  "properties": {
    "format": {
      "default": "PDF",
      "type": "string",
      "enum": [
        "ZPL",
        "PDF",
        "PNG"
      ]
    },
    "packageIds": {
      "minItems": 1,
      "maxItems": 50,
      "type": "array",
      "items": {
        "type": "string",
        "pattern": "^pkg_[0-9A-HJKMNP-TV-Z]{26}$"
      }
    }
  },
  "required": [
    "packageIds"
  ],
  "additionalProperties": false
}