diff --git a/src/disk.rs b/src/disk.rs
index e28c3179..26603770 100644
--- a/src/disk.rs
+++ b/src/disk.rs
@@ -13,6 +13,9 @@ use std::net::SocketAddr;
 use std::path::Path;
 use std::sync::Arc;
 
+pub(crate) const INBOUND_PAYMENTS_FNAME: &str = "inbound_payments";
+pub(crate) const OUTBOUND_PAYMENTS_FNAME: &str = "outbound_payments";
+
 pub(crate) struct FilesystemLogger {
 	data_dir: String,
 }
@@ -55,14 +58,17 @@ pub(crate) fn persist_channel_peer(path: &Path, peer_info: &str) -> std::io::Res
 pub(crate) fn persist_inbound_payments(
 	ldk_data_dir: String, inbound_payments: &PaymentInfoStorage,
 ) -> std::io::Result<()> {
-	persist_payment_info(Path::new(&format!("{}/inbound_payments", ldk_data_dir)), inbound_payments)
+	persist_payment_info(
+		Path::new(&format!("{}/{}", ldk_data_dir, INBOUND_PAYMENTS_FNAME)),
+		inbound_payments,
+	)
 }
 
 pub(crate) fn persist_outbound_payments(
 	ldk_data_dir: String, outbound_payments: &PaymentInfoStorage,
 ) -> std::io::Result<()> {
 	persist_payment_info(
-		Path::new(&format!("{}/outbound_payments", ldk_data_dir)),
+		Path::new(&format!("{}/{}", ldk_data_dir, OUTBOUND_PAYMENTS_FNAME)),
 		outbound_payments,
 	)
 }
diff --git a/src/main.rs b/src/main.rs
index 44720fb9..31498caf 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -13,6 +13,7 @@ use bitcoin::consensus::encode;
 use bitcoin::network::constants::Network;
 use bitcoin::BlockHash;
 use bitcoin_bech32::WitnessProgram;
+use disk::{INBOUND_PAYMENTS_FNAME, OUTBOUND_PAYMENTS_FNAME};
 use lightning::chain::keysinterface::{
 	EntropySource, InMemorySigner, KeysManager, SpendableOutputDescriptor,
 };
@@ -114,10 +115,10 @@ pub(crate) struct PaymentInfo {
 }
 
 impl_writeable_tlv_based!(PaymentInfo, {
-	(0, preimage, option),
-	(1, secret, option),
-	(2, status, required),
-	(3, amt_msat, required),
+	(0, preimage, required),
+	(2, secret, required),
+	(4, status, required),
+	(6, amt_msat, required),
 });
 
 pub(crate) struct PaymentInfoStorage {
@@ -740,12 +741,12 @@ async fn start_ldk() {
 	});
 
 	let inbound_payments = Arc::new(Mutex::new(disk::read_payment_info(Path::new(&format!(
-		"{}/inbound_payments",
-		ldk_data_dir
+		"{}/{}",
+		ldk_data_dir, INBOUND_PAYMENTS_FNAME
 	)))));
 	let outbound_payments = Arc::new(Mutex::new(disk::read_payment_info(Path::new(&format!(
-		"{}/outbound_payments",
-		ldk_data_dir
+		"{}/{}",
+		ldk_data_dir, OUTBOUND_PAYMENTS_FNAME
 	)))));
 
 	// Step 18: Handle LDK Events