Feature request: add NUT-15 Multinut payments to CLNRestWallet

[callebtc]

It would be great to have MPP with CLN as well. Here is how it works with LND:

nutshell/cashu/lightning/lndrest.py

Line 198 in 61cf7de

async def pay_partial_invoice(

[lollerfirst]

I take it that in NUT-15, Alice creates a single bolt11 invoice for a certain amount, which is her amount across all the different mints. So then when she supplies that invoice and the proofs that add up to a certain partial amount on a single mint, doesn't this check (NUT-5) prevent partial payments entirely?

nutshell/cashu/mint/ledger.py

Lines 769 to 775 in d80280e

	# verify that the amount of the input proofs is equal to the amount of the quote
	total_provided = sum_proofs(proofs)
	total_needed = melt_quote.amount + (melt_quote.fee_reserve or 0)
	if not total_provided >= total_needed:
	raise TransactionError(
	f"not enough inputs provided for melt. Provided: {total_provided}, needed: {total_needed}"
	)

[lollerfirst]

Ok I was confused now I managed to understand this anyway, thanks.