{
  "type": "object",
  "required": [
    "external_url",
    "errors"
  ],
  "properties": {
    "external_url": { "type": ["string", "null"] },
    "errors": {
      "type": "array",
      "items": { "$ref": "error.json" }
    }
  },
  "additionalProperties": false
}
