feat(activities): expose fiat checkout on event create + purchase

Both sides of the fiat-payment surface introduced by events v1.4.0:

CreateEventDialog — organizer-side opt-in:
- New "Accept fiat payments" switch (allow_fiat) + fiat currency
  picker (USD/EUR/GBP/CHF). Toggle is always shipped on
  create/edit so a true→false flip propagates correctly.
- Hint copy notes that the host's LNbits admin needs a configured
  fiat provider (Stripe etc.) for the toggle to actually work at
  purchase time.

PurchaseTicketDialog — buyer-side method selector:
- Two-button selector (Lightning / Fiat) shown only when the event
  has `allow_fiat=true`. Hidden entirely for Lightning-only events.
- Lightning path: unchanged (uses useTicketPurchase composable).
- Fiat path: posts to the API with `payment_method=fiat`, then
  surfaces a "Open <provider> checkout" button that opens the
  returned fiat_payment_request URL in a new tab. Payment
  confirmation happens via webhook on the backend; ticket appears
  in My Tickets on next reload.

EventsPage threads the new fiat fields through `selectedEvent` so
the dialog sees them.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/modules/activities/components/CreateEventDialog.vue

@@ -24,6 +24,7 @@ import { Input } from '@/components/ui/input'
 import { Textarea } from '@/components/ui/textarea'
 import { Button } from '@/components/ui/button'
 import { Badge } from '@/components/ui/badge'
+import { Switch } from '@/components/ui/switch'
 import { ScrollArea } from '@/components/ui/scroll-area'
 import {
   Select,
@@ -98,6 +99,8 @@ const formSchema = toTypedSchema(
       event_end_time: z.string().optional().default(''),
       location: z.string().max(500).optional().default(''),
       currency: z.string().default("sat"),
+      allow_fiat: z.boolean().default(false),
+      fiat_currency: z.string().default("USD"),
       amount_tickets: z.number().min(0).max(100000).default(0),
       price_per_ticket: z.number().min(0).default(0),
     })
@@ -128,6 +131,8 @@ const form = useForm({
     event_end_time: '',
     location: '',
     currency: 'sat',
+    allow_fiat: false,
+    fiat_currency: 'USD',
     amount_tickets: 0,
     price_per_ticket: 0,
   }
@@ -188,6 +193,8 @@ async function populateFromEvent(event: TicketedEvent) {
     event_end_time: end.time,
     location: event.location ?? '',
     currency: event.currency ?? 'sat',
+    allow_fiat: event.allow_fiat ?? false,
+    fiat_currency: event.fiat_currency ?? 'USD',
     amount_tickets: event.amount_tickets ?? 0,
     price_per_ticket: event.price_per_ticket ?? 0,
   })
@@ -295,6 +302,10 @@ const onSubmit = form.handleSubmit(async (formValues) => {
       eventData.banner = null
     }
     if (formValues.currency) eventData.currency = formValues.currency
+    // allow_fiat / fiat_currency: always send so the toggle reads
+    // both directions on edit (a true→false flip must propagate).
+    eventData.allow_fiat = formValues.allow_fiat
+    if (formValues.fiat_currency) eventData.fiat_currency = formValues.fiat_currency
     if (formValues.amount_tickets) eventData.amount_tickets = formValues.amount_tickets
     if (formValues.price_per_ticket) eventData.price_per_ticket = formValues.price_per_ticket
     if (selectedCategories.value.length > 0) eventData.categories = selectedCategories.value
@@ -568,6 +579,46 @@ const handleOpenChange = (open: boolean) => {
             </FormField>
           </div>
 
+          <!-- Fiat checkout (organizer opts in). Backend requires the
+               host's LNbits admin to have configured a fiat provider
+               (Stripe etc.) under settings.fiat_providers; toggling
+               this on without one will fail at purchase time. -->
+          <div class="grid grid-cols-1 sm:grid-cols-3 gap-3 items-end">
+            <FormField v-slot="{ value, handleChange }" name="allow_fiat">
+              <FormItem class="sm:col-span-2 flex flex-row items-center justify-between rounded-md border p-3">
+                <div class="space-y-0.5">
+                  <FormLabel>Accept fiat payments</FormLabel>
+                  <FormDescription class="text-xs">
+                    Buyers can pay with the LNbits instance's configured fiat provider (e.g. Stripe).
+                  </FormDescription>
+                </div>
+                <FormControl>
+                  <Switch :model-value="value as boolean" @update:model-value="handleChange" />
+                </FormControl>
+              </FormItem>
+            </FormField>
+
+            <FormField v-slot="{ componentField }" name="fiat_currency">
+              <FormItem v-show="form.values.allow_fiat">
+                <FormLabel>Fiat currency</FormLabel>
+                <FormControl>
+                  <Select v-bind="componentField">
+                    <SelectTrigger>
+                      <SelectValue placeholder="USD" />
+                    </SelectTrigger>
+                    <SelectContent>
+                      <SelectItem value="USD">USD</SelectItem>
+                      <SelectItem value="EUR">EUR</SelectItem>
+                      <SelectItem value="GBP">GBP</SelectItem>
+                      <SelectItem value="CHF">CHF</SelectItem>
+                    </SelectContent>
+                  </Select>
+                </FormControl>
+                <FormMessage />
+              </FormItem>
+            </FormField>
+          </div>
+
           <!-- Actions -->
           <div class="flex justify-end gap-3 pt-2">
             <Button type="button" variant="outline" @click="handleOpenChange(false)" :disabled="isLoading">

src/modules/activities/components/PurchaseTicketDialog.vue

@@ -1,11 +1,14 @@
 <script setup lang="ts">
-import { onUnmounted } from 'vue'
+import { computed, onUnmounted, ref } from 'vue'
 import { Dialog, DialogContent, DialogHeader, DialogTitle, DialogDescription } from '@/components/ui/dialog'
 import { Button } from '@/components/ui/button'
 import { Badge } from '@/components/ui/badge'
 import { useTicketPurchase } from '../composables/useTicketPurchase'
 import { useAuth } from '@/composables/useAuthService'
-import { User, Wallet, CreditCard, Zap, Ticket } from 'lucide-vue-next'
+import { injectService, SERVICE_TOKENS } from '@/core/di-container'
+import type { TicketApiService } from '../services/TicketApiService'
+import type { PaymentMethod } from '../types/ticket'
+import { User, Wallet, CreditCard, Zap, Ticket, ExternalLink } from 'lucide-vue-next'
 import { formatEventPrice, formatWalletBalance } from '@/lib/utils/formatting'
 
 interface Props {
@@ -14,6 +17,9 @@ interface Props {
     name: string
     price_per_ticket: number
     currency: string
+    /** Whether the event accepts fiat payments. From v1.4.0+ */
+    allow_fiat?: boolean
+    fiat_currency?: string
   }
   isOpen: boolean
 }
@@ -45,19 +51,74 @@ const {
   showTicketQR
 } = useTicketPurchase()
 
+const paymentMethod = ref<PaymentMethod>('lightning')
+const fiatRedirectUrl = ref<string | null>(null)
+const fiatProviderLabel = ref<string | null>(null)
+const isFiatPending = ref(false)
+const fiatError = ref<string | null>(null)
+
+const canChooseFiat = computed(() => Boolean(props.event.allow_fiat))
+
 async function handlePurchase() {
   if (!canPurchase.value) return
+  fiatError.value = null
 
-  try {
-    await purchaseTicketForEvent(props.event.id)
-  } catch (err) {
-    console.error('Error purchasing ticket:', err)
+  // Lightning path: existing composable handles QR + wallet auto-pay.
+  if (paymentMethod.value === 'lightning') {
+    try {
+      await purchaseTicketForEvent(props.event.id)
+    } catch (err) {
+      console.error('Error purchasing ticket:', err)
+    }
+    return
   }
+
+  // Fiat path: composable can't drive it (no QR / no bolt11). Hit the
+  // API directly, then redirect the buyer to the provider's checkout
+  // URL. Payment confirmation happens via webhook on the backend and
+  // shows up next time the buyer reloads MyTickets.
+  try {
+    isFiatPending.value = true
+    const lnbitsAPI = injectService(SERVICE_TOKENS.LNBITS_API) as any
+    const accessToken = lnbitsAPI?.getAccessToken?.() || ''
+    const ticketApi = injectService(SERVICE_TOKENS.TICKET_API) as TicketApiService
+    const currentUser = (lnbitsAPI?.currentUser?.value) || null
+    const userId = currentUser?.id
+    if (!userId) {
+      fiatError.value = 'Missing user id'
+      return
+    }
+    const invoice = await ticketApi.requestTicket(
+      props.event.id,
+      userId,
+      accessToken,
+      { paymentMethod: 'fiat' },
+    )
+    if (!invoice.isFiat || !invoice.fiatPaymentRequest) {
+      fiatError.value = 'Fiat provider did not return a checkout URL.'
+      return
+    }
+    fiatRedirectUrl.value = invoice.fiatPaymentRequest
+    fiatProviderLabel.value = invoice.fiatProvider ?? 'provider'
+  } catch (err) {
+    fiatError.value = err instanceof Error ? err.message : 'Fiat checkout failed'
+  } finally {
+    isFiatPending.value = false
+  }
+}
+
+function openFiatCheckout() {
+  if (!fiatRedirectUrl.value) return
+  window.open(fiatRedirectUrl.value, '_blank', 'noopener,noreferrer')
 }
 
 function handleClose() {
   emit('update:isOpen', false)
   resetPaymentState()
+  paymentMethod.value = 'lightning'
+  fiatRedirectUrl.value = null
+  fiatProviderLabel.value = null
+  fiatError.value = null
 }
 
 onUnmounted(() => {
@@ -161,16 +222,64 @@ onUnmounted(() => {
           </div>
         </div>
 
-        <div v-if="error" class="text-sm text-destructive bg-destructive/10 p-3 rounded-lg">
-          {{ error }}
+        <!-- Payment method selector (only shown when fiat is enabled
+             on the event). Hidden entirely for Lightning-only events
+             to keep the dialog uncluttered. -->
+        <div v-if="canChooseFiat" class="bg-muted/50 rounded-lg p-4 space-y-2">
+          <div class="text-sm font-medium">Payment method</div>
+          <div class="grid grid-cols-2 gap-2">
+            <Button
+              type="button"
+              :variant="paymentMethod === 'lightning' ? 'default' : 'outline'"
+              size="sm"
+              @click="paymentMethod = 'lightning'"
+            >
+              <Zap class="w-4 h-4 mr-1.5" />
+              Lightning
+            </Button>
+            <Button
+              type="button"
+              :variant="paymentMethod === 'fiat' ? 'default' : 'outline'"
+              size="sm"
+              @click="paymentMethod = 'fiat'"
+            >
+              <CreditCard class="w-4 h-4 mr-1.5" />
+              {{ event.fiat_currency ?? 'Fiat' }}
+            </Button>
+          </div>
+        </div>
+
+        <div v-if="error || fiatError" class="text-sm text-destructive bg-destructive/10 p-3 rounded-lg">
+          {{ error || fiatError }}
+        </div>
+
+        <!-- Fiat checkout panel — shown after a successful fiat
+             POST when we have a provider URL to redirect to. -->
+        <div v-if="fiatRedirectUrl" class="space-y-3">
+          <div class="bg-muted/50 rounded-lg p-4 space-y-2">
+            <div class="text-sm font-medium">Ready to pay with {{ fiatProviderLabel }}</div>
+            <p class="text-xs text-muted-foreground">
+              Opens the provider's checkout in a new tab. Your ticket
+              appears in My Tickets once the payment settles.
+            </p>
+          </div>
+          <Button @click="openFiatCheckout" class="w-full">
+            <ExternalLink class="w-4 h-4 mr-2" />
+            Open {{ fiatProviderLabel }} checkout
+          </Button>
         </div>
 
         <Button
+          v-else
           @click="handlePurchase"
-          :disabled="isLoading || !canPurchase"
+          :disabled="isLoading || isFiatPending || (paymentMethod === 'lightning' && !canPurchase)"
           class="w-full"
         >
-          <span v-if="isLoading" class="animate-spin mr-2">⚡</span>
+          <span v-if="isLoading || isFiatPending" class="animate-spin mr-2">⚡</span>
+          <span v-else-if="paymentMethod === 'fiat'" class="flex items-center gap-2">
+            <CreditCard class="w-4 h-4" />
+            Continue to {{ event.fiat_currency ?? 'fiat' }} checkout
+          </span>
           <span v-else-if="hasWalletWithBalance" class="flex items-center gap-2">
             <Zap class="w-4 h-4" />
             Pay with Wallet

src/modules/activities/views/EventsPage.vue

@@ -27,6 +27,8 @@ const selectedEvent = ref<{
   name: string
   price_per_ticket: number
   currency: string
+  allow_fiat?: boolean
+  fiat_currency?: string
 } | null>(null)
 
 const showEventDialog = ref(false)
@@ -56,6 +58,8 @@ function handlePurchaseClick(event: {
   name: string
   price_per_ticket: number
   currency: string
+  allow_fiat?: boolean
+  fiat_currency?: string
 }) {
   if (!isAuthenticated.value) return
   selectedEvent.value = event