lightning-fetchinvoice – Command for fetch an invoice for an offer

SYNOPSIS

(WARNING: experimental-offers only)

fetchinvoice offer [msatoshi] [quantity] [recurrence_counter] [recurrence_start] [recurrence_label] [timeout]

DESCRIPTION

The fetchinvoice RPC command contacts the issuer of an offer to get an actual invoice that can be paid. It highlights any changes between the offer and the returned invoice.

The offer must not contain send_invoice; see lightning-sendinvoice(7).

msatoshi is required if the offer does not specify an amount at all, otherwise it is not allowed.

quantity is is required if the offer specifies quantity_min or quantity_max, otherwise it is not allowed.

recurrence_counter is required if the offer specifies recurrence, otherwise it is not allowed. recurrence_counter should first be set to 0, and incremented for each successive invoice in a given series.

recurrence_start is required if the offer specifies recurrence_base with start_any_period set, otherwise it is not allowed. It indicates what period number to start at.

recurrence_label is required if recurrence_counter is set, and otherwise is not allowed. It must be the same as prior fetchinvoice calls for the same recurrence, as it is used to link them together.

timeout is an optional timeout; if we don’t get a reply before this we fail (default, 60 seconds).

RETURN VALUE

On success, an object as follows is returned:

  • invoice: the bolt12-encoded invoice string, starting with “lni1”.

  • changes: an object detailing changes between the offer and invoice.

Optionally:

  • next_period: an object returned for recurring invoices if the next period is under the recurrence_limit (if any).

The changes object can have and of the following members:

  • description_appended: extra characters appended to the description field.

  • description: a completely replaced description field.

  • vendor_removed”: the offer vendor field, which has been omitted from the invoice.

  • vendor”: the offer vendor field, which has changed from the invoice.

  • msat”: the amount, if different from the offer amount multiplied by any quantity (or the offer had no amount, or was not in BTC).

The next_period object has at least the following members:

  • counter: the index of the next period to be fetchinvoice.

  • starttime: the time that the next period starts (seconds since 1970)

  • endtime: the time that the next period ends (seconds since 1970)

  • paywindow_start: the earliest time that the next invoice can be fetched (seconds since 1970)

  • paywindow_end: the latest time that the next invoice can be fetched (seconds since 1970)

The following error codes may occur:

  • -1: Catchall nonspecific error.

  • 1002: Offer has expired.

  • 1003: Cannot find a route to the node making the offer.

  • 1004: The node making the offer returned an error message.

  • 1005: We timed out trying to fetch an invoice.

AUTHOR

Rusty Russell <rusty@rustcorp.com.au> is mainly responsible.

SEE ALSO

lightning-sendinvoice(7), lightning-pay(7).

RESOURCES

Main web site: https://github.com/ElementsProject/lightning