{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "title": "AddonPurchase",
  "description": "",
  "type": "object",
  "properties": {
    "addon_id": {
      "enum": [
        "esignature",
        "signnow"
      ],
      "type": "string"
    },
    "quantity": {
      "type": "integer"
    }
  },
  "required": [
    "addon_id",
    "quantity"
  ]
}