backend/src/db/migrate.ts

@@ -238,6 +238,15 @@ async function migrate() {
     try {
       await (db as any).run(sql`ALTER TABLE payments ADD COLUMN reminder_sent_at TEXT`);
     } catch (e) { /* column may already exist */ }
+    try {
+      await (db as any).run(sql`ALTER TABLE payments ADD COLUMN lnbits_invoice TEXT`);
+    } catch (e) { /* column may already exist */ }
+    try {
+      await (db as any).run(sql`ALTER TABLE payments ADD COLUMN lnbits_expires_at TEXT`);
+    } catch (e) { /* column may already exist */ }
+    try {
+      await (db as any).run(sql`ALTER TABLE payments ADD COLUMN lnbits_amount_sats INTEGER`);
+    } catch (e) { /* column may already exist */ }
 
     // Invoices table
     await (db as any).run(sql`
@@ -719,6 +728,15 @@ async function migrate() {
     try {
       await (db as any).execute(sql`ALTER TABLE payments ADD COLUMN reminder_sent_at TIMESTAMP`);
     } catch (e) { /* column may already exist */ }
+    try {
+      await (db as any).execute(sql`ALTER TABLE payments ADD COLUMN lnbits_invoice TEXT`);
+    } catch (e) { /* column may already exist */ }
+    try {
+      await (db as any).execute(sql`ALTER TABLE payments ADD COLUMN lnbits_expires_at TIMESTAMP`);
+    } catch (e) { /* column may already exist */ }
+    try {
+      await (db as any).execute(sql`ALTER TABLE payments ADD COLUMN lnbits_amount_sats INTEGER`);
+    } catch (e) { /* column may already exist */ }
 
     // Invoices table
     await (db as any).execute(sql`

backend/src/db/schema.ts

@@ -121,6 +121,9 @@ export const sqlitePayments = sqliteTable('payments', {
   currency: text('currency').notNull().default('PYG'),
   status: text('status', { enum: ['pending', 'pending_approval', 'paid', 'refunded', 'failed', 'cancelled', 'on_hold'] }).notNull().default('pending'),
   reference: text('reference'),
+  lnbitsInvoice: text('lnbits_invoice'), // BOLT11 string, stored so an unpaid invoice can be redisplayed without a new LNbits call
+  lnbitsExpiresAt: text('lnbits_expires_at'), // When lnbitsInvoice expires
+  lnbitsAmountSats: integer('lnbits_amount_sats'), // Sats amount for display (from LNbits' fiat conversion)
   userMarkedPaidAt: text('user_marked_paid_at'), // When user clicked "I Have Paid"
   payerName: text('payer_name'), // Name of payer if different from attendee
   paidAt: text('paid_at'),
@@ -476,6 +479,9 @@ export const pgPayments = pgTable('payments', {
   currency: varchar('currency', { length: 10 }).notNull().default('PYG'),
   status: varchar('status', { length: 20 }).notNull().default('pending'),
   reference: varchar('reference', { length: 255 }),
+  lnbitsInvoice: pgText('lnbits_invoice'), // BOLT11 string, stored so an unpaid invoice can be redisplayed without a new LNbits call
+  lnbitsExpiresAt: timestamp('lnbits_expires_at'), // When lnbitsInvoice expires
+  lnbitsAmountSats: pgInteger('lnbits_amount_sats'), // Sats amount for display (from LNbits' fiat conversion)
   userMarkedPaidAt: timestamp('user_marked_paid_at'),
   payerName: varchar('payer_name', { length: 255 }), // Name of payer if different from attendee
   paidAt: timestamp('paid_at'),

backend/src/lib/lnbits.ts

@@ -36,6 +36,11 @@ export interface CreateInvoiceParams {
   extra?: Record<string, any>; // Additional metadata
 }
 
+// How long a booking's Lightning invoice is valid for, in seconds. Shared
+// between initial booking creation and invoice regeneration so both produce
+// invoices with the same lifetime.
+export const LNBITS_INVOICE_EXPIRY_SECONDS = 900; // 15 minutes
+
 /**
  * Check if LNbits is configured
  */

backend/src/routes/lnbits.ts

@@ -1,9 +1,15 @@
 import { Hono } from 'hono';
 import { streamSSE } from 'hono/streaming';
-import { db, dbGet, dbAll, tickets, payments } from '../db/index.js';
-import { eq, and } from 'drizzle-orm';
-import { getNow } from '../lib/utils.js';
-import { verifyWebhookPayment, getPaymentStatus } from '../lib/lnbits.js';
+import { db, dbGet, dbAll, tickets, payments, events } from '../db/index.js';
+import { eq, and, inArray } from 'drizzle-orm';
+import { getNow, toDbDate } from '../lib/utils.js';
+import {
+  verifyWebhookPayment,
+  getPaymentStatus,
+  createInvoice,
+  isLNbitsConfigured,
+  LNBITS_INVOICE_EXPIRY_SECONDS,
+} from '../lib/lnbits.js';
 import emailService from '../lib/email.js';
 import { getPubSub } from '../lib/stores/pubsub.js';
 import { getLock } from '../lib/stores/lock.js';
@@ -391,6 +397,145 @@ lnbitsRouter.get('/stream/:ticketId', async (c) => {
   });
 });
 
+/**
+ * Get a Lightning invoice for a ticket to pay or re-pay.
+ *
+ * Reuses the stored invoice if it still has more than 5 minutes of validity
+ * left; otherwise generates a fresh one from LNbits. This is what lets a user
+ * come back to an unpaid Lightning booking later (e.g. from "Pay now" on the
+ * dashboard) instead of hitting a dead end.
+ */
+lnbitsRouter.post('/invoice/:ticketId', async (c) => {
+  const ticketId = c.req.param('ticketId');
+
+  const ticket = await dbGet<any>(
+    (db as any).select().from(tickets).where(eq((tickets as any).id, ticketId))
+  );
+  if (!ticket) {
+    return c.json({ error: 'Ticket not found' }, 404);
+  }
+
+  const payment = await dbGet<any>(
+    (db as any).select().from(payments).where(eq((payments as any).ticketId, ticketId))
+  );
+  if (!payment) {
+    return c.json({ error: 'Payment not found' }, 404);
+  }
+
+  if (payment.provider !== 'lightning') {
+    return c.json({ error: 'This booking is not a Lightning payment' }, 400);
+  }
+
+  if (ticket.status === 'confirmed' || payment.status === 'paid') {
+    return c.json({ alreadyPaid: true });
+  }
+
+  if (ticket.status !== 'pending' || payment.status !== 'pending') {
+    return c.json({
+      error: 'This booking is no longer active. Please make a new booking.',
+    }, 400);
+  }
+
+  // Gather every ticket/payment in the booking group - a multi-ticket booking
+  // shares a single Lightning invoice for the combined total.
+  let groupTickets: any[] = [ticket];
+  if (ticket.bookingId) {
+    groupTickets = await dbAll<any>(
+      (db as any).select().from(tickets).where(eq((tickets as any).bookingId, ticket.bookingId))
+    );
+  }
+  const groupPayments = await dbAll<any>(
+    (db as any).select().from(payments).where(inArray((payments as any).ticketId, groupTickets.map((t: any) => t.id)))
+  );
+  const invoiceHolder = groupPayments.find((p: any) => p.reference) || payment;
+  const totalAmount = groupPayments.reduce((sum: number, p: any) => sum + Number(p.amount), 0);
+  const currency = invoiceHolder.currency;
+
+  const now = Date.now();
+  const FIVE_MIN_MS = 5 * 60 * 1000;
+  const expiresAtMs = invoiceHolder.lnbitsExpiresAt ? new Date(invoiceHolder.lnbitsExpiresAt).getTime() : 0;
+
+  if (invoiceHolder.reference && invoiceHolder.lnbitsInvoice && expiresAtMs - now > FIVE_MIN_MS) {
+    return c.json({
+      invoice: {
+        paymentHash: invoiceHolder.reference,
+        paymentRequest: invoiceHolder.lnbitsInvoice,
+        amount: invoiceHolder.lnbitsAmountSats || 0,
+        fiatAmount: totalAmount,
+        fiatCurrency: currency,
+        expiresAt: invoiceHolder.lnbitsExpiresAt,
+      },
+      reused: true,
+    });
+  }
+
+  // No usable stored invoice (never created, expired, or expiring soon) - get a fresh one.
+  if (!isLNbitsConfigured()) {
+    return c.json({ error: 'Bitcoin Lightning payments are not available at this time' }, 400);
+  }
+
+  const event = await dbGet<any>(
+    (db as any).select().from(events).where(eq((events as any).id, ticket.eventId))
+  );
+
+  const apiUrl = process.env.API_URL || 'http://localhost:3001';
+  const webhookSecret = process.env.LNBITS_WEBHOOK_SECRET || '';
+  const webhookUrl = webhookSecret
+    ? `${apiUrl}/api/lnbits/webhook?token=${encodeURIComponent(webhookSecret)}`
+    : `${apiUrl}/api/lnbits/webhook`;
+  const attendeeName = `${ticket.attendeeFirstName} ${ticket.attendeeLastName || ''}`.trim();
+
+  try {
+    const lnbitsInvoice = await createInvoice({
+      amount: totalAmount,
+      unit: currency,
+      memo: `Spanglish: ${event?.title || 'Event'} - ${attendeeName}${groupTickets.length > 1 ? ` (${groupTickets.length} tickets)` : ''}`,
+      webhookUrl,
+      expiry: LNBITS_INVOICE_EXPIRY_SECONDS,
+      extra: {
+        ticketId: invoiceHolder.ticketId,
+        bookingId: ticket.bookingId || null,
+        ticketIds: groupTickets.map((t: any) => t.id),
+        eventId: ticket.eventId,
+        eventTitle: event?.title,
+        attendeeName,
+        attendeeEmail: ticket.attendeeEmail,
+        ticketCount: groupTickets.length,
+      },
+    });
+
+    const lnbitsExpiresAt = toDbDate(new Date(now + LNBITS_INVOICE_EXPIRY_SECONDS * 1000));
+
+    await (db as any)
+      .update(payments)
+      .set({
+        reference: lnbitsInvoice.paymentHash,
+        lnbitsInvoice: lnbitsInvoice.paymentRequest,
+        lnbitsExpiresAt,
+        lnbitsAmountSats: lnbitsInvoice.amount,
+        updatedAt: getNow(),
+      })
+      .where(eq((payments as any).id, invoiceHolder.id));
+
+    return c.json({
+      invoice: {
+        paymentHash: lnbitsInvoice.paymentHash,
+        paymentRequest: lnbitsInvoice.paymentRequest,
+        amount: lnbitsInvoice.amount,
+        fiatAmount: lnbitsInvoice.fiatAmount ?? totalAmount,
+        fiatCurrency: lnbitsInvoice.fiatCurrency ?? currency,
+        expiresAt: lnbitsExpiresAt,
+      },
+      reused: false,
+    });
+  } catch (error: any) {
+    console.error('Failed to create Lightning invoice:', error);
+    return c.json({
+      error: `Failed to create Lightning invoice: ${error.message || 'Unknown error'}`,
+    }, 500);
+  }
+});
+
 /**
  * Get payment status for a ticket (fallback polling endpoint)
  */

backend/src/routes/tickets.ts

@@ -4,8 +4,8 @@ import { z } from 'zod';
 import { db, dbGet, dbAll, tickets, events, users, payments, paymentOptions, eventPaymentOverrides, siteSettings, isSqlite } from '../db/index.js';
 import { eq, and, or, sql, inArray } from 'drizzle-orm';
 import { requireAuth, getAuthUser } from '../lib/auth.js';
-import { generateId, generateTicketCode, getNow, calculateAvailableSeats, isEventSoldOut } from '../lib/utils.js';
-import { createInvoice, isLNbitsConfigured } from '../lib/lnbits.js';
+import { generateId, generateTicketCode, getNow, toDbDate, calculateAvailableSeats, isEventSoldOut } from '../lib/utils.js';
+import { createInvoice, isLNbitsConfigured, LNBITS_INVOICE_EXPIRY_SECONDS } from '../lib/lnbits.js';
 import { rateLimitMiddleware } from '../lib/rateLimit.js';
 import emailService from '../lib/email.js';
 import { generateTicketPDF, generateCombinedTicketsPDF } from '../lib/pdf.js';
@@ -418,7 +418,7 @@ ticketsRouter.post('/', zValidator('json', createTicketSchema), async (c) => {
         unit: event.currency, // LNbits supports fiat currencies like USD, PYG, etc.
         memo: `Spanglish: ${event.title} - ${fullName}${ticketCount > 1 ? ` (${ticketCount} tickets)` : ''}`,
         webhookUrl,
-        expiry: 900, // 15 minutes expiry for faster UX
+        expiry: LNBITS_INVOICE_EXPIRY_SECONDS, // 15 minutes expiry for faster UX
         extra: {
           ticketId: primaryTicket.id,
           bookingId: ticketCount > 1 ? bookingId : null,
@@ -430,13 +430,22 @@ ticketsRouter.post('/', zValidator('json', createTicketSchema), async (c) => {
           ticketCount,
         },
       });
-      
-      // Update primary payment with LNbits payment hash reference
+
+      const lnbitsExpiresAt = toDbDate(new Date(Date.now() + LNBITS_INVOICE_EXPIRY_SECONDS * 1000));
+
+      // Update primary payment with the LNbits invoice - the BOLT11 string and
+      // expiry are persisted so the "Pay now" page can redisplay this same
+      // invoice later instead of erroring out on an unpaid Lightning booking.
       await (db as any)
         .update(payments)
-        .set({ reference: lnbitsInvoice.paymentHash })
+        .set({
+          reference: lnbitsInvoice.paymentHash,
+          lnbitsInvoice: lnbitsInvoice.paymentRequest,
+          lnbitsExpiresAt,
+          lnbitsAmountSats: lnbitsInvoice.amount,
+        })
         .where(eq((payments as any).id, primaryPayment.id));
-        
+
       (primaryPayment as any).reference = lnbitsInvoice.paymentHash;
     } catch (error: any) {
       console.error('Failed to create Lightning invoice:', error);

frontend/src/app/(public)/book/[eventId]/page.tsx

@@ -16,7 +16,7 @@ import type {
   PaymentMethod,
 } from './_types';
 import { buildPaymentMethods, formatRuc, rucPattern } from './_logic/booking';
-import { useLightningWatcher } from './_hooks/useLightningWatcher';
+import { useLightningWatcher } from '@/hooks/useLightningWatcher';
 import { PayingStep } from './_steps/PayingStep';
 import { ManualPaymentStep } from './_steps/ManualPaymentStep';
 import { PendingApprovalStep } from './_steps/PendingApprovalStep';
@@ -35,7 +35,6 @@ export default function BookingPage() {
   const [step, setStep] = useState<BookingStep>('form');
   const [submitting, setSubmitting] = useState(false);
   const [bookingResult, setBookingResult] = useState<BookingResult | null>(null);
-  const [, setPaymentPending] = useState(false);
   const [markingPaid, setMarkingPaid] = useState(false);
 
   // State for payer name (when paid under different name)
@@ -245,7 +244,13 @@ export default function BookingPage() {
   };
 
   // Watch for Lightning payment confirmation while on the paying step.
-  useLightningWatcher(step, bookingResult?.ticketId, locale, setPaymentPending, setStep);
+  useLightningWatcher(
+    step === 'paying',
+    bookingResult?.ticketId,
+    locale,
+    () => setStep('success'),
+    () => {}
+  );
 
   // Handle "I Have Paid" button click
   const handleMarkPaymentSent = async () => {
@@ -330,7 +335,6 @@ export default function BookingPage() {
         };
         setBookingResult(result);
         setStep('paying');
-        setPaymentPending(true);
         // Payment confirmation is handled by the paying-step watcher effect.
       } else if (formData.paymentMethod === 'bank_transfer' || formData.paymentMethod === 'tpago') {
         // Manual payment methods - show payment details

frontend/src/app/(public)/booking/[ticketId]/page.tsx

@@ -1,15 +1,17 @@
 'use client';
 
-import { useState, useEffect } from 'react';
+import { useState, useEffect, useCallback } from 'react';
 import { useParams, useSearchParams } from 'next/navigation';
 import Link from 'next/link';
 import { useLanguage } from '@/context/LanguageContext';
-import { ticketsApi, paymentOptionsApi, Ticket, PaymentOptionsConfig } from '@/lib/api';
+import { ticketsApi, paymentOptionsApi, Ticket, PaymentOptionsConfig, LightningInvoice } from '@/lib/api';
 import { formatPrice, formatDateLong, formatTime, getTpagoLink } from '@/lib/utils';
+import { useLightningWatcher } from '@/hooks/useLightningWatcher';
+import { PayingStep } from '@/app/(public)/book/[eventId]/_steps/PayingStep';
 import Card from '@/components/ui/Card';
 import Button from '@/components/ui/Button';
-import { 
-  CheckCircleIcon, 
+import {
+  CheckCircleIcon,
   ClockIcon,
   XCircleIcon,
   TicketIcon,
@@ -22,7 +24,7 @@ import {
 } from '@heroicons/react/24/outline';
 import toast from 'react-hot-toast';
 
-type PaymentStep = 'loading' | 'manual_payment' | 'pending_approval' | 'confirmed' | 'error';
+type PaymentStep = 'loading' | 'manual_payment' | 'lightning_payment' | 'pending_approval' | 'confirmed' | 'error';
 
 export default function BookingPaymentPage() {
   const params = useParams();
@@ -33,10 +35,36 @@ export default function BookingPaymentPage() {
   const [step, setStep] = useState<PaymentStep>('loading');
   const [markingPaid, setMarkingPaid] = useState(false);
   const [error, setError] = useState<string | null>(null);
+  const [lightningInvoice, setLightningInvoice] = useState<LightningInvoice | null>(null);
+  const [invoiceExpired, setInvoiceExpired] = useState(false);
+  const [fetchingInvoice, setFetchingInvoice] = useState(false);
 
   const ticketId = params.ticketId as string;
   const requestedStep = searchParams.get('step');
 
+  // Get (or refresh) the Lightning invoice for this ticket - reuses the
+  // stored invoice if still valid, otherwise the backend generates a new one.
+  const fetchLightningInvoice = useCallback(async () => {
+    setFetchingInvoice(true);
+    try {
+      const result = await ticketsApi.getLightningInvoice(ticketId);
+      if (result.alreadyPaid) {
+        setStep('confirmed');
+        return;
+      }
+      if (result.invoice) {
+        setLightningInvoice(result.invoice);
+        setInvoiceExpired(false);
+        setStep('lightning_payment');
+      }
+    } catch (err: any) {
+      setError(err.message || 'Failed to load Lightning invoice');
+      setStep('error');
+    } finally {
+      setFetchingInvoice(false);
+    }
+  }, [ticketId]);
+
   // Fetch ticket and payment config
   useEffect(() => {
     if (!ticketId) return;
@@ -45,7 +73,7 @@ export default function BookingPaymentPage() {
       try {
         // Get ticket with event and payment info
         const { ticket: ticketData } = await ticketsApi.getById(ticketId);
-        
+
         if (!ticketData) {
           setError('Booking not found');
           setStep('error');
@@ -54,10 +82,24 @@ export default function BookingPaymentPage() {
 
         setTicket(ticketData);
 
-        // Only proceed for manual payment methods
         const paymentMethod = ticketData.payment?.provider;
+
+        if (paymentMethod === 'lightning') {
+          if (ticketData.status === 'confirmed' || ticketData.payment?.status === 'paid') {
+            setStep('confirmed');
+          } else if (ticketData.status === 'cancelled') {
+            setError(locale === 'es'
+              ? 'Esta reserva ya no está activa. Por favor realiza una nueva reserva.'
+              : 'This booking is no longer active. Please make a new booking.');
+            setStep('error');
+          } else {
+            await fetchLightningInvoice();
+          }
+          return;
+        }
+
         if (!['bank_transfer', 'tpago'].includes(paymentMethod || '')) {
-          // Not a manual payment method, redirect to success page or show appropriate state
+          // Not a manual or Lightning payment method, show appropriate state
           if (ticketData.status === 'confirmed' || ticketData.payment?.status === 'paid') {
             setStep('confirmed');
           } else {
@@ -75,7 +117,7 @@ export default function BookingPaymentPage() {
 
         // Determine which step to show based on payment status
         const paymentStatus = ticketData.payment?.status;
-        
+
         if (paymentStatus === 'paid' || ticketData.status === 'confirmed') {
           setStep('confirmed');
         } else if (paymentStatus === 'pending_approval') {
@@ -96,6 +138,15 @@ export default function BookingPaymentPage() {
     loadBookingData();
   }, [ticketId]);
 
+  // Watch for Lightning payment confirmation while the invoice is on screen.
+  useLightningWatcher(
+    step === 'lightning_payment' && !invoiceExpired,
+    ticketId,
+    locale,
+    () => setStep('confirmed'),
+    () => setInvoiceExpired(true)
+  );
+
   // Handle "I Have Paid" button click
   const handleMarkPaymentSent = async () => {
     if (!ticket) return;
@@ -301,6 +352,49 @@ export default function BookingPaymentPage() {
     );
   }
 
+  // Lightning payment step - show the (reused or freshly generated) invoice
+  if (step === 'lightning_payment' && ticket) {
+    if (invoiceExpired) {
+      return (
+        <div className="section-padding">
+          <div className="container-page max-w-xl">
+            <Card className="p-8 text-center">
+              <div className="w-16 h-16 rounded-full bg-orange-100 flex items-center justify-center mx-auto mb-6">
+                <ClockIcon className="w-10 h-10 text-orange-600" />
+              </div>
+              <h1 className="text-2xl font-bold text-primary-dark mb-2">
+                {locale === 'es' ? 'La factura expiró' : 'Invoice expired'}
+              </h1>
+              <p className="text-gray-600 mb-6">
+                {locale === 'es'
+                  ? 'Genera una nueva factura Lightning para continuar con el pago.'
+                  : 'Generate a new Lightning invoice to continue with payment.'}
+              </p>
+              <Button onClick={fetchLightningInvoice} isLoading={fetchingInvoice} size="lg">
+                {locale === 'es' ? 'Generar Nueva Factura' : 'Generate New Invoice'}
+              </Button>
+            </Card>
+          </div>
+        </div>
+      );
+    }
+
+    if (!lightningInvoice) {
+      return (
+        <div className="section-padding">
+          <div className="container-page max-w-xl text-center">
+            <div className="animate-spin w-8 h-8 border-4 border-primary-yellow border-t-transparent rounded-full mx-auto" />
+            <p className="mt-4 text-gray-600">
+              {locale === 'es' ? 'Preparando tu factura...' : 'Preparing your invoice...'}
+            </p>
+          </div>
+        </div>
+      );
+    }
+
+    return <PayingStep invoice={lightningInvoice} qrCode={ticket.qrCode} locale={locale} />;
+  }
+
   // Manual payment step - show payment details and "I have paid" button
   if (step === 'manual_payment' && ticket && paymentConfig) {
     const isBankTransfer = ticket.payment?.provider === 'bank_transfer';

frontend/src/hooks/useLightningWatcher.ts

@@ -1,22 +1,21 @@
 import { useEffect } from 'react';
 import toast from 'react-hot-toast';
 import { ticketsApi } from '@/lib/api';
-import type { BookingStep } from '../_types';
 
 /**
- * Watch for Lightning payment confirmation while on the paying step.
+ * Watch for Lightning payment confirmation while an invoice is on screen.
  * SSE gives instant updates; a 3s poll runs in parallel as a safety net so a
  * buffered/stuck stream (e.g. a proxy that doesn't flush SSE) can't strand the UI.
  */
 export function useLightningWatcher(
-  step: BookingStep,
+  active: boolean,
   ticketId: string | undefined,
   locale: string,
-  setPaymentPending: (value: boolean) => void,
-  setStep: (value: BookingStep) => void
+  onPaid: () => void,
+  onExpired: () => void
 ) {
   useEffect(() => {
-    if (step !== 'paying' || !ticketId) return;
+    if (!active || !ticketId) return;
 
     let settled = false;
     let pollTimer: ReturnType<typeof setTimeout> | null = null;
@@ -25,15 +24,14 @@ export function useLightningWatcher(
       if (settled) return;
       settled = true;
       toast.success(locale === 'es' ? '¡Pago confirmado!' : 'Payment confirmed!');
-      setPaymentPending(false);
-      setStep('success');
+      onPaid();
     };
 
     const expire = () => {
       if (settled) return;
       settled = true;
       toast.error(locale === 'es' ? 'La factura ha expirado' : 'Invoice has expired');
-      setPaymentPending(false);
+      onExpired();
     };
 
     // Always same-origin so the streaming proxy route handler is used (it
@@ -79,5 +77,5 @@ export function useLightningWatcher(
       eventSource.close();
       if (pollTimer) clearTimeout(pollTimer);
     };
-  }, [step, ticketId, locale]);
+  }, [active, ticketId, locale]);
 }

frontend/src/lib/api/tickets.ts

@@ -6,6 +6,7 @@ import type {
   TicketValidationResult,
   TicketSearchResult,
   LiveSearchResult,
+  LightningInvoice,
 } from './types';
 
 export const ticketsApi = {
@@ -137,6 +138,14 @@ export const ticketsApi = {
       `/api/lnbits/status/${ticketId}`
     ),
 
+  // Get a Lightning invoice to pay/re-pay a ticket - reuses the stored invoice
+  // if it's still valid, otherwise generates a fresh one.
+  getLightningInvoice: (ticketId: string) =>
+    fetchApi<{ invoice?: LightningInvoice; reused?: boolean; alreadyPaid?: boolean }>(
+      `/api/lnbits/invoice/${ticketId}`,
+      { method: 'POST' }
+    ),
+
   // Get PDF download URL (returns the URL, not the PDF itself)
   getPdfUrl: (id: string) => `${API_BASE}/api/tickets/${id}/pdf`,
 };

frontend/src/lib/api/types.ts

@@ -25,6 +25,15 @@ export interface Event {
   updatedAt: string;
 }
 
+export interface LightningInvoice {
+  paymentHash: string;
+  paymentRequest: string; // BOLT11 invoice
+  amount: number; // Amount in satoshis
+  fiatAmount?: number; // Original fiat amount
+  fiatCurrency?: string; // Original fiat currency
+  expiresAt?: string;
+}
+
 export interface Ticket {
   id: string;
   bookingId?: string; // Groups multiple tickets from same booking