plugins: lsps: replace owned types by references

diff --git a/plugins/lsps-plugin/src/core/transport.rs b/plugins/lsps-plugin/src/core/transport.rs
index 5e5ce749..0d86afbf 100644
--- a/plugins/lsps-plugin/src/core/transport.rs
+++ b/plugins/lsps-plugin/src/core/transport.rs
@@ -39,8 +39,9 @@ pub type Result<T> = std::result::Result<T, Error>;
 /// request over some transport mechanism (RPC, Bolt8, etc.)
 #[async_trait]
 pub trait Transport: Send + Sync {
-    async fn send(&self, peer: &PublicKey, request: String) -> Result<String>;
-    async fn notify(&self, peer: &PublicKey, request: String) -> Result<()>;
+    async fn send(&self, peer: &PublicKey, request: &str) -> Result<String>;
+    async fn notify(&self, peer: &PublicKey, request: &str) -> Result<()>;
+}
 }
 
 /// A typed JSON-RPC client that works with any transport implementation.
@@ -152,7 +153,7 @@ impl<T: Transport> JsonRpcClient<T> {
             method, id, &request_json
         );
         let start = tokio::time::Instant::now();
-        let res_str = self.transport.send(peer, request_json).await?;
+        let res_str = self.transport.send(peer, &request_json).await?;
         let elapsed = start.elapsed();
         debug!(
             "Received response: method={}, id={}, response={}, elapsed={}ms",
@@ -176,7 +177,7 @@ impl<T: Transport> JsonRpcClient<T> {
         let request_json = serde_json::to_string(&payload)?;
         debug!("Sending notification: method={}", method);
         let start = tokio::time::Instant::now();
-        self.transport.notify(peer_id, request_json).await?;
+        self.transport.notify(peer_id, &request_json).await?;
         let elapsed = start.elapsed();
         debug!(
             "Sent notification: method={}, elapsed={}ms",
@@ -241,10 +242,10 @@ mod test_json_rpc {
         async fn send(
             &self,
             _peer_id: &PublicKey,
-            req: String,
+            req: &str,
         ) -> core::result::Result<String, Error> {
             // Store the request
-            let _ = self.req.set(req);
+            let _ = self.req.set(req.to_owned());
 
             // Check for error first
             if let Some(err) = &*self.err {
@@ -259,13 +260,9 @@ mod test_json_rpc {
             panic!("TestTransport: neither result nor error is set.");
         }
 
-        async fn notify(
-            &self,
-            _peer_id: &PublicKey,
-            req: String,
-        ) -> core::result::Result<(), Error> {
+        async fn notify(&self, _peer_id: &PublicKey, req: &str) -> core::result::Result<(), Error> {
             // Store the request
-            let _ = self.req.set(req);
+            let _ = self.req.set(req.to_owned());
 
             // Check for error
             if let Some(err) = &*self.err {
diff --git a/plugins/lsps-plugin/src/lsps0/transport.rs b/plugins/lsps-plugin/src/lsps0/transport.rs
index f549ccf8..ffc98e92 100644
--- a/plugins/lsps-plugin/src/lsps0/transport.rs
+++ b/plugins/lsps-plugin/src/lsps0/transport.rs
@@ -208,7 +208,7 @@ impl Bolt8Transport {
         &self,
         client: &mut ClnRpc,
         peer_id: &PublicKey,
-        payload: Vec<u8>,
+        payload: &[u8],
     ) -> Result<(), Error> {
         send_custommsg(client, payload, peer_id).await
     }
@@ -228,12 +228,12 @@ impl Bolt8Transport {
 /// Sends a custom message to the destination node.
 pub async fn send_custommsg(
     client: &mut ClnRpc,
-    payload: Vec<u8>,
+    payload: &[u8],
     peer: &PublicKey,
 ) -> Result<(), Error> {
     let msg = CustomMsg {
         message_type: LSPS0_MESSAGE_TYPE,
-        payload,
+        payload: payload.to_owned(),
     };
 
     let request = cln_rpc::model::requests::SendcustommsgRequest {
@@ -257,9 +257,9 @@ impl Transport for Bolt8Transport {
     async fn send(
         &self,
         peer_id: &PublicKey,
-        request: String,
+        request: &str,
     ) -> core::result::Result<String, Error> {
-        let id = extract_message_id(&request)?;
+        let id = extract_message_id(request)?;
         let mut client = self.connect_to_node().await?;
 
         let (tx, rx) = mpsc::channel(1);
@@ -274,7 +274,7 @@ impl Transport for Bolt8Transport {
         self.hook_watcher
             .subscribe_hook_once(id, Arc::downgrade(&tx_arc))
             .await;
-        self.send_custom_msg(&mut client, peer_id, request.into_bytes())
+        self.send_custom_msg(&mut client, peer_id, request.as_bytes())
             .await?;
 
         let res = self.wait_for_response(rx).await?;
@@ -297,13 +297,9 @@ impl Transport for Bolt8Transport {
     }
 
     /// Sends a notification without waiting for a response.
-    async fn notify(
-        &self,
-        peer_id: &PublicKey,
-        request: String,
-    ) -> core::result::Result<(), Error> {
+    async fn notify(&self, peer_id: &PublicKey, request: &str) -> core::result::Result<(), Error> {
         let mut client = self.connect_to_node().await?;
-        self.send_custom_msg(&mut client, peer_id, request.into_bytes())
+        self.send_custom_msg(&mut client, peer_id, request.as_bytes())
             .await
     }
 }
diff --git a/plugins/lsps-plugin/src/service.rs b/plugins/lsps-plugin/src/service.rs
index 2b443045..ea0def45 100644
--- a/plugins/lsps-plugin/src/service.rs
+++ b/plugins/lsps-plugin/src/service.rs
@@ -189,6 +189,6 @@ impl JsonRpcResponseWriter for LspsResponseWriter {
         let mut client = cln_rpc::ClnRpc::new(&self.rpc_path)
             .await
             .map_err(|e| Error::Internal(e.to_string()))?;
-        transport::send_custommsg(&mut client, payload.to_vec(), &self.peer_id).await
+        transport::send_custommsg(&mut client, payload, &self.peer_id).await
     }
 }