+ /// A multiplier used with the payment amount to calculate a fixed penalty applied to each
+ /// channel, in excess of the [`base_penalty_msat`].
+ ///
+ /// The purpose of the amount penalty is to avoid having fees dominate the channel cost (i.e.,
+ /// fees plus penalty) for large payments. The penalty is computed as the product of this
+ /// multiplier and `2^30`ths of the payment amount.
+ ///
+ /// ie `base_penalty_amount_multiplier_msat * amount_msat / 2^30`
+ ///
+ /// Default value: 8,192 msat
+ ///
+ /// [`base_penalty_msat`]: Self::base_penalty_msat
+ pub base_penalty_amount_multiplier_msat: u64,
+