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lightning-invoice -- Command for accepting payments
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===================================================
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SYNOPSIS
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--------
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**invoice** *msatoshi* *label* *description* \[*expiry*\]
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\[*fallbacks*\] \[*preimage*\] \[*exposeprivatechannels*\]
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DESCRIPTION
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-----------
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The **invoice** RPC command creates the expectation of a payment of a
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given amount of milli-satoshi: it returns a unique token which another
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lightning daemon can use to pay this invoice. This token includes a
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*route hint* description of an incoming channel with capacity to pay the
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invoice, if any exists.
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The *msatoshi* parameter can be the string "any", which creates an
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invoice that can be paid with any amount. Otherwise it is in
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millisatoshi precision; it can be a whole number, or a whole number
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ending in *msat* or *sat*, or a number with three decimal places ending
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in *sat*, or a number with 1 to 11 decimal places ending in *btc*.
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The *label* must be a unique string or number (which is treated as a
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string, so "01" is different from "1"); it is never revealed to other
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nodes on the lightning network, but it can be used to query the status
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of this invoice.
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The *description* is a short description of purpose of payment, e.g. *1
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cup of coffee*. This value is encoded into the BOLT11 invoice and is
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viewable by any node you send this invoice to. It must be UTF-8, and
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cannot use *\\u* JSON escape codes.
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The *expiry* is optionally the time the invoice is valid for; without a
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suffix it is interpreted as seconds, otherwise suffixes *s*, *m*, *h*,
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*d*, *w* indicate seconds, minutes, hours, days and weeks respectively.
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If no value is provided the default of 604800 (1w) is used.
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The *fallbacks* array is one or more fallback addresses to include in
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the invoice (in order from most-preferred to least): note that these
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arrays are not currently tracked to fulfill the invoice.
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The *preimage* is a 64-digit hex string to be used as payment preimage
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for the created invoice. By default, if unspecified, lightningd will
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generate a secure pseudorandom preimage seeded from an appropriate
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entropy source on your system. **IMPORTANT**: if you specify the
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*preimage*, you are responsible, to ensure appropriate care for
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generating using a secure pseudorandom generator seeded with sufficient
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entropy, and keeping the preimage secret. This parameter is an advanced
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feature intended for use with cutting-edge cryptographic protocols and
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should not be used unless explicitly needed.
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If specified, *exposeprivatechannels* overrides the default route hint
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logic, which will use unpublished channels only if there are no
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published channels. If *true* unpublished channels are always considered
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as a route hint candidate; if *false*, never. If it is a short channel id
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(e.g. *1x1x3*) or array of short channel ids, only those specific channels
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will be considered candidates, even if they are public or dead-ends.
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The route hint is selected from the set of incoming channels of which:
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peer’s balance minus their reserves is at least *msatoshi*, state is
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normal, the peer is connected and not a dead end (i.e. has at least one
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other public channel). The selection uses some randomness to prevent
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probing, but favors channels that become more balanced after the
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payment.
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RETURN VALUE
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------------
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On success, a hash is returned as *payment\_hash* to be given to the
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payer, and the *expiry\_time* as a UNIX timestamp. It also returns a
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BOLT11 invoice as *bolt11* to be given to the payer.
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On failure, an error is returned and no invoice is created. If the
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lightning process fails before responding, the caller should use
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lightning-listinvoice(7) to query whether this invoice was created or
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not.
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The following error codes may occur:
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- -1: Catchall nonspecific error.
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- 900: An invoice with the given *label* already exists.
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- 901: An invoice with the given *preimage* already exists.
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- 902: None of the specified *exposeprivatechannels* were usable.
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One of the following warnings may occur (on success):
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- *warning\_offline* if no channel with a currently connected peer has
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the incoming capacity to pay this invoice
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- *warning\_capacity* if there is no channel that has sufficient
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incoming capacity
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- *warning\_deadends* if there is no channel that is not a dead-end
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AUTHOR
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------
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Rusty Russell <<rusty@rustcorp.com.au>> is mainly responsible.
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SEE ALSO
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--------
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lightning-listinvoice(7), lightning-delinvoice(7),
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lightning-getroute(7), lightning-sendpay(7).
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RESOURCES
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---------
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Main web site: <https://github.com/ElementsProject/lightning>
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