feat: add bolt11 field to PaymentDetails

Store the full BOLT11 invoice string in `PaymentKind` variants to allow retrieval of the original invoice after payment creation.

- Add optional `bolt11: Option<String>` field to `PaymentKind::Bolt11` and `PaymentKind::Bolt11Jit`
- Update all payment creation flows to persist the original BOLT11 invoice string
- Expose `bolt11` field in FFI/uniffi bindings
- Maintain backward compatibility by defaulting to `None` for older/legacy payments

Author: coreyphillips

bindings/ldk_node.udl

@@ -429,8 +429,8 @@ interface ClosureReason {
 [Enum]
 interface PaymentKind {
 	Onchain(Txid txid, ConfirmationStatus status);
-	Bolt11(PaymentHash hash, PaymentPreimage? preimage, PaymentSecret? secret, string? description);
-	Bolt11Jit(PaymentHash hash, PaymentPreimage? preimage, PaymentSecret? secret, u64? counterparty_skimmed_fee_msat, LSPFeeLimits lsp_fee_limits, string? description);
+	Bolt11(PaymentHash hash, PaymentPreimage? preimage, PaymentSecret? secret, string? description, string? bolt11);
+	Bolt11Jit(PaymentHash hash, PaymentPreimage? preimage, PaymentSecret? secret, u64? counterparty_skimmed_fee_msat, LSPFeeLimits lsp_fee_limits, string? description, string? bolt11);
 	Bolt12Offer(PaymentHash? hash, PaymentPreimage? preimage, PaymentSecret? secret, OfferId offer_id, UntrustedString? payer_note, u64? quantity);
 	Bolt12Refund(PaymentHash? hash, PaymentPreimage? preimage, PaymentSecret? secret, UntrustedString? payer_note, u64? quantity);
 	Spontaneous(PaymentHash hash, PaymentPreimage? preimage);

src/payment/bolt11.rs

@@ -189,6 +189,7 @@ impl Bolt11Payment {
 					preimage: None,
 					secret: payment_secret,
 					description,
+					bolt11: Some(invoice.to_string()),
 				};
 				let payment = PaymentDetails::new(
 					payment_id,
@@ -221,6 +222,7 @@ impl Bolt11Payment {
 							preimage: None,
 							secret: payment_secret,
 							description,
+							bolt11: Some(invoice.to_string()),
 						};
 						let payment = PaymentDetails::new(
 							payment_id,
@@ -342,6 +344,7 @@ impl Bolt11Payment {
 					preimage: None,
 					secret: Some(*payment_secret),
 					description,
+					bolt11: Some(invoice.to_string()),
 				};
 
 				let payment = PaymentDetails::new(
@@ -375,6 +378,7 @@ impl Bolt11Payment {
 							preimage: None,
 							secret: Some(*payment_secret),
 							description,
+							bolt11: Some(invoice.to_string()),
 						};
 						let payment = PaymentDetails::new(
 							payment_id,
@@ -619,6 +623,7 @@ impl Bolt11Payment {
 			preimage,
 			secret: Some(payment_secret.clone()),
 			description,
+			bolt11: Some(invoice.to_string()),
 		};
 		let payment = PaymentDetails::new(
 			id,
@@ -767,6 +772,7 @@ impl Bolt11Payment {
 			counterparty_skimmed_fee_msat: None,
 			lsp_fee_limits,
 			description,
+			bolt11: Some(invoice.to_string()),
 		};
 		let payment = PaymentDetails::new(
 			id,

src/payment/store.rs

@@ -139,9 +139,10 @@ impl Readable for PaymentDetails {
 						counterparty_skimmed_fee_msat,
 						lsp_fee_limits,
 						description: None,
+						bolt11: None,
 					}
 				} else {
-					PaymentKind::Bolt11 { hash, preimage, secret, description: None }
+					PaymentKind::Bolt11 { hash, preimage, secret, description: None, bolt11: None }
 				}
 			} else {
 				PaymentKind::Spontaneous { hash, preimage }
@@ -367,6 +368,8 @@ pub enum PaymentKind {
 		secret: Option<PaymentSecret>,
 		/// The description from the BOLT 11 invoice.
 		description: Option<String>,
+		/// The BOLT 11 invoice string.
+		bolt11: Option<String>,
 	},
 	/// A [BOLT 11] payment intended to open an [bLIP-52 / LSPS 2] just-in-time channel.
 	///
@@ -396,6 +399,8 @@ pub enum PaymentKind {
 		lsp_fee_limits: LSPFeeLimits,
 		/// The description from the BOLT 11 invoice.
 		description: Option<String>,
+		/// The BOLT 11 invoice string.
+		bolt11: Option<String>,
 	},
 	/// A [BOLT 12] 'offer' payment, i.e., a payment for an [`Offer`].
 	///
@@ -462,6 +467,7 @@ impl_writeable_tlv_based_enum!(PaymentKind,
 		(2, preimage, option),
 		(4, secret, option),
 		(6, description, option),
+		(8, bolt11, option),
 	},
 	(4, Bolt11Jit) => {
 		(0, hash, required),
@@ -470,6 +476,7 @@ impl_writeable_tlv_based_enum!(PaymentKind,
 		(4, secret, option),
 		(6, lsp_fee_limits, required),
 		(8, description, option),
+		(10, bolt11, option),
 	},
 	(6, Bolt12Offer) => {
 		(0, hash, option),
@@ -677,7 +684,7 @@ mod tests {
 			);
 
 			match bolt11_decoded.kind {
-				PaymentKind::Bolt11 { hash: h, preimage: p, secret: s, description: _ } => {
+				PaymentKind::Bolt11 { hash: h, preimage: p, secret: s, description: _, bolt11: _ } => {
 					assert_eq!(hash, h);
 					assert_eq!(preimage, p);
 					assert_eq!(secret, s);
@@ -727,6 +734,7 @@ mod tests {
 					counterparty_skimmed_fee_msat: c,
 					lsp_fee_limits: l,
 					description: _,
+					bolt11: _,
 				} => {
 					assert_eq!(hash, h);
 					assert_eq!(preimage, p);