{
    "$schema": "http://json-schema.org/draft-07/schema#",
    "type": "object",
    "additionalProperties": false,
    "required": [ "invoice", "changes" ],
    "properties": {
	"invoice": {
	    "type": "string",
	    "description": "The BOLT12 invoice we fetched"
	},
	"changes": {
	    "type": "object",
	    "description": "Summary of changes from offer",
	    "additionalProperties": false,
	    "required": [ ],
	    "properties": {
		"description_appended": {
		    "type": "string",
		    "description": "extra characters appended to the *description* field."
		},
		"description": {
		    "type": "string",
		    "description": "a completely replaced *description* field"
		},
		"vendor_removed": {
		    "type": "string",
		    "description": "The *vendor* from the offer, which is missing in the invoice"
		},
		"vendor": {
		    "type": "string",
		    "description": "a completely replaced *vendor* field"
		},
		"msat": {
		    "type": "msat",
		    "description": "the amount, if different from the offer amount multiplied by any *quantity* (or the offer had no amount, or was not in BTC)."
		}
	    }
	},
	"next_period": {
	    "type": "object",
	    "description": "Only for recurring invoices if the next period is under the *recurrence_limit*",
	    "additionalProperties": false,
	    "required": [ "counter", "starttime", "endtime", "paywindow_start", "paywindow_end" ],
	    "properties": {
		"counter": {
		    "type": "u64",
		    "description": "the index of the next period to fetchinvoice"
		},
		"starttime": {
		    "type": "u64",
		    "description": "UNIX timestamp that the next period starts"
		},
		"endtime": {
		    "type": "u64",
		    "description": "UNIX timestamp that the next period ends"
		},
		"paywindow_start": {
		    "type": "u64",
		    "description": "UNIX timestamp of the earliest time that the next invoice can be fetched"
		},
		"paywindow_end": {
		    "type": "u64",
		    "description": "UNIX timestamp of the latest time that the next invoice can be fetched"
		}
	    }
	}
    }
}