{
  "$schema": "http://json-schema.org/draft-04/schema#",
  "title": "adjustment",
  "type": "object",
  "properties": {
    "address": {"$ref": "address"},
    "amount": {"$ref": "amount"},
    "tag": {"$ref": "tag"}
  },
  "required": ["address", "amount"],
  "additionalProperties": false
}