{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "type": "object",
  "additionalProperties": false,
  "required": [
    "invstring",
    "label",
    "preimage"
  ],
  "properties": {
    "invstring": {
      "type": "string",
      "description": ""
    },
    "label": {
      "oneOf": [
        {
          "type": "string"
        },
        {
          "type": "integer"
        }
      ],
      "description": "a unique string or number (which is treated as a string, so `01` is different from `1`); it is never revealed to other nodes on the lightning network, but it can be used to query the status of this invoice"
    },
    "preimage": {
      "type": "hex",
      "description": ""
    }
  }
}