{
  "checks": [
    {
      "path": "/invoice/id",
      "type": "string"
    },
    {
      "path": "/invoice/currency",
      "equals": "USD"
    },
    {
      "path": "/invoice/total",
      "type": "number",
      "min": 0,
      "max": 150
    }
  ]
}