This has been a long time in the making, but we finally are able to build new features on top of the paymod series.
This modifier is rather simple, but that's all it takes: add the payment preimage, that we generate randomly, into the onion payload for the final hop, so a recipient that knows to look for it can claim the incoming payment.
Todo

Write the man-page for lightning-cli keysend

Article posted 4 weeks ago