Return dispatch_fee_payment from message details RPC (#1014)

bridges/primitives/messages/src/lib.rs

@@ -23,6 +23,7 @@
 #![allow(clippy::unnecessary_mut_passed)]
 
 use bitvec::prelude::*;
+use bp_runtime::messages::DispatchFeePayment;
 use codec::{Decode, Encode};
 use frame_support::RuntimeDebug;
 use sp_std::{collections::vec_deque::VecDeque, prelude::*};
@@ -169,7 +170,7 @@ impl<RelayerId> InboundLaneData<RelayerId> {
 }
 
 /// Message details, returned by runtime APIs.
-#[derive(Clone, Default, Encode, Decode, RuntimeDebug, PartialEq, Eq)]
+#[derive(Clone, Encode, Decode, RuntimeDebug, PartialEq, Eq)]
 pub struct MessageDetails<OutboundMessageFee> {
 	/// Nonce assigned to the message.
 	pub nonce: MessageNonce,
@@ -179,6 +180,8 @@ pub struct MessageDetails<OutboundMessageFee> {
 	pub size: u32,
 	/// Delivery+dispatch fee paid by the message submitter at the source chain.
 	pub delivery_and_dispatch_fee: OutboundMessageFee,
+	/// Where the fee for dispatching message is paid?
+	pub dispatch_fee_payment: DispatchFeePayment,
 }
 
 /// Bit vector of message dispatch results.