MPP and AMP When a single channel can't carry the full payment amount or no single path has enough liquidity, the sender splits the payment. MPP (Multi-Path Payments) — BOLT 9 bit 16 Split into N parts, each with the same payment hash and (BOLT 11 's' tag). Receiver's wallet: 1. Receives first HTLC; sees , this part's amount. 2. Holds HTLC; doesn't fulfill yet. 3. Waits for more parts to arrive (with same payment secret). 4. When , atomically fulfills all HTLCs with the preimage. If timeout reached and not enough collected: fail all parts. Funds return to sender (minus any that already timed…