.TH "LIGHTNING-FETCHINVOICE" "7" "" "" "lightning-fetchinvoice"
.SH NAME
lightning-fetchinvoice - Command for fetch an invoice for an offer
.SH SYNOPSIS

\fIEXPERIMENTAL_FEATURES only\fR


\fBfetchinvoice\fR \fIoffer\fR [\fImsatoshi\fR] [\fIquantity\fR] [\fIrecurrence_counter\fR] [\fIrecurrence_start\fR] [\fIrecurrence_label\fR] [\fItimeout\fR]

.SH DESCRIPTION

The \fBfetchinvoice\fR RPC command contacts the issuer of an \fIoffer\fR 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 \fIsend_invoice\fR; see \fBlightning-sendinvoice\fR(7)\.


\fImsatoshi\fR is required if the \fIoffer\fR does not specify
an amount at all, otherwise it is not allowed\.


\fIquantity\fR is is required if the \fIoffer\fR specifies
\fIquantity_min\fR or \fIquantity_max\fR, otherwise it is not allowed\.


\fIrecurrence_counter\fR is required if the \fIoffer\fR
specifies \fIrecurrence\fR, otherwise it is not allowed\.
\fIrecurrence_counter\fR should first be set to 0, and incremented for
each successive invoice in a given series\.


\fIrecurrence_start\fR is required if the \fIoffer\fR
specifies \fIrecurrence_base\fR with \fIstart_any_period\fR set, otherwise it
is not allowed\.  It indicates what period number to start at\.


\fIrecurrence_label\fR is required if \fIrecurrence_counter\fR 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\.


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

.SH RETURN VALUE

On success, an object as follows is returned:

.RS
.IP \[bu]
\fIinvoice\fR: the bolt12-encoded invoice string, starting with "lni1"\.
.IP \[bu]
\fIchanges\fR: an object detailing changes between the offer and invoice\.

.RE

Optionally:

.RS
.IP \[bu]
\fInext_period\fR: an object returned for recurring invoices if the next 
period is under the recurrence_limit (if any)\.

.RE

The \fIchanges\fR object can have and of the following members:

.RS
.IP \[bu]
\fIdescription_appended\fR: extra characters appended to the \fIdescription\fR field\.
.IP \[bu]
\fIdescription\fR: a completely replaced \fIdescription\fR field\.
.IP \[bu]
\fIvendor_removed\fR": the offer vendor field, which has been omitted from the invoice\.
.IP \[bu]
\fIvendor\fR": the offer vendor field, which has changed from the invoice\.
.IP \[bu]
\fImsat\fR": the amount, if different from the offer amount multiplied
by any \fIquantity\fR (or the offer had no amount, or was not in BTC)\.

.RE

The \fInext_period\fR object has at least the following members:

.RS
.IP \[bu]
\fIcounter\fR: the index of the next period to be fetchinvoice\.
.IP \[bu]
\fIstarttime\fR: the time that the next period starts (seconds since 1970)
.IP \[bu]
\fIendtime\fR: the time that the next period ends (seconds since 1970)
.IP \[bu]
\fIpaywindow_start\fR: the earliest time that the next invoice can be fetched (seconds since 1970)
.IP \[bu]
\fIpaywindow_end\fR: the latest time that the next invoice can be fetched (seconds since 1970)

.RE

The following error codes may occur:

.RS
.IP \[bu]
-1: Catchall nonspecific error\.
.IP \[bu]
1002: Offer has expired\.
.IP \[bu]
1003: Cannot find a route to the node making the offer\.
.IP \[bu]
1004: The node making the offer returned an error message\.
.IP \[bu]
1005: We timed out trying to fetch an invoice\.

.RE
.SH AUTHOR

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

.SH SEE ALSO

\fBlightning-sendinvoice\fR(7), \fBlightning-pay\fR(7)\.

.SH RESOURCES

Main web site: \fIhttps://github.com/ElementsProject/lightning\fR

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