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LSPS2: Add ability to signal channel open failure #136
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Closes lightningdevkit/rust-lightning#3479
There are a number of reasons a channel open might fail or be abandoned by the LSP. This adds a way for the LSP to signal back to the library that this has happened.
All pending payments are failed backwards and the channel state is reset to
PendingInitialPayment
as per the spec. This allows the payer to try again.