I think we should specify whether amount can be provided if bolt11 invoice contains an amount.

There are 3 options:
a) amount must not be provided
b) amount can be provided but is ignored
c) amount can be provided but must match the amount in bolt11 invoice

I like the C option the most.

I think we should specify whether amount can be provided if bolt11 invoice contains an amount.

Good point, I've updated wording to reflect this.

Setting for the info endpoint (some backends can't pay amountless invoices)

Setting for the info endpoint (some backends can't pay amountless invoices)

Added in 6628ff1