{
  "key": "external_reference",
  "name": "External reference",
  "description": "An opaque ID in another system, optionally scoped to an account or brand.",
  "version": "0.1.0",
  "properties": [
    {
      "key": "id",
      "name": "ID",
      "description": "Opaque, case-sensitive identifier assigned by the external system.",
      "type": "string",
      "required": true
    },
    {
      "key": "routing_key",
      "name": "Routing key",
      "description": "Identifies the account or brand within the vendor/type namespace. Omit when routing is unambiguous.",
      "type": "string"
    }
  ]
}