multi_pay_invoice and multi_pay_keysend are for just doing multiple payments in a single command, to save on the number of requests needed, nothing to do with AMP

lol, naming is confusing then, maybe we should rename them? ;)

half-joking

to save on the number of requests needed, nothing to do with AMP

what about one call to drain a wallet? i imagine this could be very useful for some people.