core-lightning/doc/lightning-sendpay.7

'\" t
.\"     Title: lightning-sendpay
.\"    Author: [see the "AUTHOR" section]
.\" Generator: DocBook XSL Stylesheets v1.79.1 <http://docbook.sf.net/>
.\"      Date: 03/22/2018
.\"    Manual: \ \&
.\"    Source: \ \&
.\"  Language: English
.\"
.TH "LIGHTNING\-SENDPAY" "7" "03/22/2018" "\ \&" "\ \&"
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.SH "NAME"
lightning-sendpay \- Protocol for sending a payment via a route\&.
.SH "SYNOPSIS"
.sp
\fBsendpay\fR \fIroute\fR \fIhash\fR [\fImsatoshi\fR]
.SH "DESCRIPTION"
.sp
The \fBsendpay\fR RPC command attempts to send funds associated with the given \fIhash\fR, along a route to the final destination in the route\&.
.sp
Generally, a client would call getroute(7) to resolve a route, then use \fBsendpay\fR to send it\&. If it fails, it would call getroute(7) again to retry\&.
.sp
The response will occur when the payment is on its way to the destination\&. The \fBsendpay\fR RPC command does not wait for definite success or definite failure of the payment\&. Instead, use the \fBwaitsendpay\fR RPC command to poll or wait for definite success or definite failure\&.
.sp
The \fImsatoshi\fR amount, if provided, is the amount that will be recorded as the target payment value\&. If not specified, it will be the final amount to the destination\&. If specified, then the final amount at the destination must be from the specified \fImsatoshi\fR to twice the specified \fImsatoshi\fR, inclusive\&. This is intended to obscure payments by overpaying slightly at the destination; the actual target payment is what should be specified as the \fImsatoshi\fR argument\&.
.sp
Once a payment has succeeded, calls to \fBsendpay\fR with the same \fIhash\fR but a different \fImsatoshi\fR or destination will fail; this prevents accidental multiple payments\&. Calls to \fBsendpay\fR with the same \fIhash\fR, \fImsatoshi\fR, and destination as a previous successful payment (even if a different route) will return immediately with success\&.
.SH "RETURN VALUE"
.sp
On success, an object similar to the output of \fBlistpayments\fR will be returned\&. This object will have a \fIstatus\fR field that is typically the string \fI"pending"\fR, but may be \fI"complete"\fR if the payment was already performed successfully\&.
.sp
On error, if the error occurred from a node other than the final destination, the route table will be updated so that getroute(7) should return an alternate route (if any)\&. An error from the final destination implies the payment should not be retried\&.
.sp
The following error codes may occur:
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
\-1\&. Catchall nonspecific error\&.
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
201\&. Already paid with this
\fIhash\fR
using different amount or destination\&.
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
202\&. Unparseable onion reply\&. The
\fIdata\fR
field of the error will have an
\fIonionreply\fR
field, a hex string representation of the raw onion reply\&.
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
203\&. Permanent failure at destination\&. The
\fIdata\fR
field of the error will be routing failure object\&.
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
204\&. Failure along route; retry a different route\&. The
\fIdata\fR
field of the error will be routing failure object\&.
.RE
.sp
A routing failure object has the fields below:
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
\fIerring_index\fR\&. The index of the node along the route that reported the error\&. 0 for the local node, 1 for the first hop, and so on\&.
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
\fIerring_node\fR\&. The hex string of the pubkey id of the node that reported the error\&.
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
\fIerring_channel\fR\&. The short channel ID of the channel that has the error, or
\fI0:0:0\fR
if the destination node raised the error\&.
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
\fIfailcode\fR\&. The failure code, as per BOLT #4\&.
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
\fIchannel_update\fR\&. The hex string of the
\fIchannel_update\fR
message received from the remote node\&. Only present if error is from the remote node and the
\fIfailcode\fR
has the UPDATE bit set, as per BOLT #4\&.
.RE
.SH "AUTHOR"
.sp
Rusty Russell <rusty@rustcorp\&.com\&.au> is mainly responsible\&.
.SH "SEE ALSO"
.sp
lightning\-listinvoice(7), lightning\-delinvoice(7), lightning\-getroute(7), lightning\-invoice(7), lightning\-pay(7), lightning\-waitsendpay(7)\&.
.SH "RESOURCES"
.sp
Main web site: https://github\&.com/ElementsProject/lightning