Support async payments in BOLT 12 (Blinded Paths, keysend, Bolt12, Offer)

https://github.com/lightningdevkit/rust-lightning/pull/3383

Host: vincenzopalazzo  -  PR author: valentinewallace

Notes

Question

  1. Did you review ldk/3383? Is it a Concept ACK, approach ACK, tested ACK, or NACK?