{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "type": "object",
  "additionalProperties": false,
  "required": [],
  "properties": {
    "invstring": {
      "type": "string",
      "description": "if specified, the command will return a list of payment attempts whose invoice matches *invstring*, otherwise all payments with be listed"
    }
  }
}