154 lines
5.6 KiB
Plaintext
154 lines
5.6 KiB
Plaintext
LIGHTNING-PAY(7)
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================
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:doctype: manpage
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NAME
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----
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lightning-pay - Command for sending a payment to a BOLT11 invoice
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SYNOPSIS
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--------
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*pay* 'bolt11' ['msatoshi'] ['label'] ['riskfactor'] ['maxfeepercent'] ['retry_for'] ['maxdelay'] ['exemptfee']
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DESCRIPTION
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-----------
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The *pay* RPC command attempts to find a route to the given destination,
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and send the funds it asks for. If the 'bolt11' does not contain an amount,
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'msatoshi' is required, otherwise if it is specified it must be 'null'.
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'msatoshi' is in millisatoshi precision; it can be a whole number, or
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a whole number with suffix 'msat' or 'sat', or a three decimal
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point number with suffix 'sat', or an 1 to 11 decimal point number
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suffixed by 'btc'.
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The 'label' field is used to attach a label to payments, and is returned
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in lightning-listpays(7) and lightning-listsendpays(7).
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The 'riskfactor' is described in detail
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in lightning-getroute(7), and defaults to 10.
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The 'maxfeepercent' limits the money paid in fees, and defaults to 0.5.
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The `maxfeepercent' is a percentage of the amount that is to be
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paid.
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The `exemptfee` option can be used for tiny payments which would be dominated by
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the fee leveraged by forwarding nodes. Setting `exemptfee` allows the
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`maxfeepercent` check to be skipped on fees that are smaller than `exemptfee`
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(default: 5000 millisatoshi).
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The response will occur when the payment fails or succeeds. Once a
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payment has succeeded, calls to *pay* with the same 'bolt11' will
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succeed immediately.
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The command will keep finding routes and retrying the payment until
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it succeeds, or the given 'retry_for' seconds passes.
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Note that the command may stop retrying while a pending payment is
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ongoing, which you need to monitor with *listpays*.
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'retry_for' defaults to 60 seconds and can only be an integer.
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When using 'lightning-cli', you may skip optional parameters by using
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'null'.
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Alternatively, use *-k* option to provide parameters by name.
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RANDOMIZATION
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-------------
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To protect user privacy, the payment algorithm performs some randomization.
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1. Route Randomization
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2. Value Randomization
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Route randomization means the payment algorithm
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does not always use the lowest-fee or shortest route.
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This prevents some highly-connected node
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from learning all of the user payments
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by reducing their fees below
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the network average.
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Value randomization means the payment algorithm
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will add a small random amount to the actual value
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paid to the destination.
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This prevents intervening nodes
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from identifying exactly how much is being transacted.
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Both randomizations respect 'maxfeepercent'.
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Route randomization plus the random value in value randomization
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will never exceed 'maxfeepercent' of the payment.
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Route randomization will not take routes that would exceed 'maxdelay'.
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RETURN VALUE
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------------
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On success, this returns the payment 'preimage' which hashes to the
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'payment_hash' to prove that the payment was successful.
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It will also return, a 'getroute_tries' and a 'sendpay_tries'
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statistics for the number of times it internally called *getroute*
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and *sendpay*.
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On error, if the error occurred from a node other than the final
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destination, the route table will be updated so that getroute(7)
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should return an alternate route (if any). An error from the final
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destination implies the payment should not be retried.
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The following error codes may occur:
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* -1. Catchall nonspecific error.
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* 200. Payment timed out while a payment is in progress. Monitor
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the status of that payment with 'listpays' command.
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* 201. Already paid with this 'hash' using different amount or
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destination.
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* 203. Permanent failure at destination. The 'data' field of
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the error will be routing failure object.
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* 205. Unable to find a route.
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* 206. Route too expensive.
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Either the fee or the needed total locktime for the route
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exceeds your 'maxfeepercent' or 'maxdelay' settings,
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respectively.
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The 'data' field of the error will indicate the actual 'fee'
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as well as the 'feepercent' percentage that the fee has of the
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destination payment amount.
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It will also indicate the actual 'delay' along the route.
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* 207. Invoice expired. Payment took too long before expiration,
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or already expired at the time you initiated payment.
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The 'data' field of the error indicates 'now' (the current time)
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and 'expiry' (the invoice expiration) as UNIX epoch time in
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seconds.
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* 210. Payment timed out without a payment in progress.
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Error codes 202 and 204 will only get reported at *sendpay*;
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in *pay* we will keep retrying if we would have gotten those
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errors.
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A routing failure object has the fields below:
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* 'erring_index'. The index of the node along the route that
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reported the error. 0 for the local node, 1 for the first
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hop, and so on.
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* 'erring_node'. The hex string of the pubkey id of the node
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that reported the error.
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* 'erring_channel'. The short channel ID of the channel that
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has the error, or '0:0:0' if the destination node raised
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the error.
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* 'failcode'. The failure code, as per BOLT #4.
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* 'channel_update'. The hex string of the 'channel_update'
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message received from the remote node. Only present if
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error is from the remote node and the 'failcode' has the
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UPDATE bit set, as per BOLT #4.
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The 'data' field of errors will include statistics
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'getroute_tries' and 'sendpay_tries'.
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It will also contain a 'failures' field with detailed data
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about routing errors.
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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-listpays(7), lightning-decodepay(7),
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lightning-listinvoice(7), lightning-delinvoice(7),
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lightning-getroute(7), lightning-invoice(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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