diff --git a/.env.example b/.env.example
index 58f6095..0bb0da4 100644
--- a/.env.example
+++ b/.env.example
@@ -1,6 +1,9 @@
 NUXT_DATABASE_URL=postgresql://postgres:postgres@127.0.0.1:5432/dinner_ticket_system
 NUXT_REDIS_URL=redis://127.0.0.1:6379
 NUXT_SESSION_COOKIE_NAME=dinner_ticket_session
+NUXT_WHATSAPP_ACCESS_TOKEN=
+NUXT_WHATSAPP_PHONE_NUMBER_ID=
+NUXT_WHATSAPP_API_VERSION=v23.0
 
 # Use your deployed HTTPS origin in production so WebAuthn/passkeys validate correctly.
 NUXT_PUBLIC_APP_URL=http://localhost:20013
diff --git a/README.md b/README.md
index 7e39373..1f7c6d0 100644
--- a/README.md
+++ b/README.md
@@ -17,10 +17,14 @@ Create `.env` from `.env.example` and set:
 ```bash
 NUXT_DATABASE_URL=postgresql://postgres:postgres@127.0.0.1:5432/dinner_ticket_system
 NUXT_REDIS_URL=redis://127.0.0.1:6379
+NUXT_WHATSAPP_ACCESS_TOKEN=
+NUXT_WHATSAPP_PHONE_NUMBER_ID=
+NUXT_WHATSAPP_API_VERSION=v23.0
 NUXT_PUBLIC_APP_URL=http://localhost:20013
 ```
 
 `NUXT_PUBLIC_APP_URL` should be your final HTTPS origin in production. Passkeys rely on the RP origin being stable and correct.
+Set the WhatsApp variables to enable automatic ticket receipt delivery after PIC confirmation. Without them, confirmation still succeeds and the UI reports that WhatsApp delivery was skipped.
 
 ## Setup
 
diff --git a/app/pages/confirmation/[token].vue b/app/pages/confirmation/[token].vue
index 722faf5..ef7e1a0 100644
--- a/app/pages/confirmation/[token].vue
+++ b/app/pages/confirmation/[token].vue
@@ -1,5 +1,5 @@
 <script lang="ts" setup>
-import type { PublicBooking } from '~~/shared/booking'
+import type { ConfirmBookingResponse, PublicBooking } from '~~/shared/booking'
 
 import {
   formatBookingCurrency,
@@ -85,7 +85,7 @@ async function confirmBooking() {
   confirming.value = true
 
   try {
-    const response = await apiClient<{ booking: PublicBooking, alreadyConfirmed: boolean }>(
+    const response = await apiClient<ConfirmBookingResponse>(
       `/api/public/bookings/${token}/confirm`,
       {
         method: 'POST'
@@ -98,8 +98,10 @@ async function confirmBooking() {
       title: response.alreadyConfirmed ? 'Booking already confirmed' : 'Booking confirmed',
       description: response.alreadyConfirmed
         ? 'This booking had already been confirmed earlier.'
-        : 'The booking details have been confirmed successfully.',
-      color: 'success',
+        : response.ticketReceiptWhatsApp.sent
+          ? `Ticket receipt was sent to ${response.ticketReceiptWhatsApp.recipientPhone}.`
+          : `Booking confirmed, but the ticket receipt WhatsApp was not sent: ${response.ticketReceiptWhatsApp.error}`,
+      color: response.alreadyConfirmed || response.ticketReceiptWhatsApp.sent ? 'success' : 'warning',
       icon: 'i-lucide-check-circle-2'
     })
   } catch (error) {
diff --git a/app/pages/index.vue b/app/pages/index.vue
index 71d3bd8..c328693 100644
--- a/app/pages/index.vue
+++ b/app/pages/index.vue
@@ -1,7 +1,12 @@
 <script lang="ts" setup>
 import type { FormError, FormSubmitEvent } from '@nuxt/ui'
 
-import { isValidPhoneNumber, type PublicContact } from '~~/shared/auth'
+import {
+  DEFAULT_PHONE_COUNTRY_CODE,
+  isValidPhoneNumber,
+  normalizePhoneNumber,
+  type PublicContact
+} from '~~/shared/auth'
 import type { CreateBookingResponse } from '~~/shared/booking'
 import {
   BOOKING_MODE_OPTIONS,
@@ -51,7 +56,7 @@ const personInCharge = computed(() => {
 
 const form = reactive({
   name: '',
-  phone: '',
+  phone: DEFAULT_PHONE_COUNTRY_CODE,
   bookingMode: 'table' as BookingMode,
   quantity: 1,
   ticketType: 'vip' as TicketType
@@ -85,7 +90,7 @@ function validateBooking(state: typeof form): FormError[] {
   if (!state.phone.trim()) {
     errors.push({ name: 'phone', message: 'Please enter a contact number.' })
   } else if (!isValidPhoneNumber(state.phone.trim())) {
-    errors.push({ name: 'phone', message: 'Use a valid phone number with 8 to 15 digits.' })
+    errors.push({ name: 'phone', message: 'Use a valid phone number with country code, e.g. +60123456789.' })
   }
 
   if (state.quantity < 1) {
@@ -117,7 +122,7 @@ async function bookTicket(event: FormSubmitEvent<typeof form>) {
       method: 'POST',
       body: {
         customerName: form.name.trim(),
-        customerPhone: form.phone.trim(),
+        customerPhone: normalizePhoneNumber(form.phone),
         bookingMode: form.bookingMode,
         quantity: form.quantity,
         ticketType: form.ticketType,
@@ -181,7 +186,7 @@ async function bookTicket(event: FormSubmitEvent<typeof form>) {
             </UFormField>
 
             <UFormField name="phone" label="Phone Number" required>
-              <UInput v-model="form.phone" size="xl" type="tel" class="w-full" placeholder="e.g. 0123456789" />
+              <UInput v-model="form.phone" size="xl" type="tel" class="w-full" placeholder="e.g. +60123456789" />
             </UFormField>
           </div>
 
diff --git a/app/pages/management/users/index.vue b/app/pages/management/users/index.vue
index 5c5e90b..9dfbde6 100644
--- a/app/pages/management/users/index.vue
+++ b/app/pages/management/users/index.vue
@@ -166,7 +166,7 @@
                 size="lg"
                 type="tel"
                 class="w-full"
-                placeholder="e.g. 0123456789"
+                placeholder="e.g. +60123456789"
               />
             </UFormField>
 
@@ -208,6 +208,7 @@
 import type { FormError, FormSubmitEvent } from '@nuxt/ui'
 
 import {
+  DEFAULT_PHONE_COUNTRY_CODE,
   hasValidFullName,
   isValidPhoneNumber,
   isValidUsername,
@@ -242,7 +243,7 @@ const editingUserId = ref<string | null>(null)
 const userForm = reactive({
   fullName: '',
   username: '',
-  phoneNumber: '',
+  phoneNumber: DEFAULT_PHONE_COUNTRY_CODE,
   role: 'staff' as UserRole
 })
 
@@ -287,7 +288,7 @@ await refreshUsers()
 function resetUserForm() {
   userForm.fullName = ''
   userForm.username = ''
-  userForm.phoneNumber = ''
+  userForm.phoneNumber = DEFAULT_PHONE_COUNTRY_CODE
   userForm.role = 'staff'
   editingUserId.value = null
 }
@@ -303,7 +304,7 @@ function openEditModal(user: ManagedUser) {
   editingUserId.value = user.id
   userForm.fullName = user.fullName
   userForm.username = user.username
-  userForm.phoneNumber = user.phoneNumber || ''
+  userForm.phoneNumber = user.phoneNumber ? normalizePhoneNumber(user.phoneNumber) : DEFAULT_PHONE_COUNTRY_CODE
   userForm.role = user.role
   editorOpen.value = true
 }
@@ -329,7 +330,7 @@ function validateUserForm(state: typeof userForm): FormError[] {
   }
 
   if (!isValidPhoneNumber(state.phoneNumber)) {
-    errors.push({ name: 'phoneNumber', message: 'Use a valid phone number with 8 to 15 digits.' })
+    errors.push({ name: 'phoneNumber', message: 'Use a valid phone number with country code, e.g. +60123456789.' })
   }
 
   return errors
diff --git a/app/pages/receipt/[token].vue b/app/pages/receipt/[token].vue
index bd50b57..cf09155 100644
--- a/app/pages/receipt/[token].vue
+++ b/app/pages/receipt/[token].vue
@@ -607,7 +607,7 @@ async function openBatchShare() {
               <UInput
                 v-model="shareForm.recipientName"
                 class="w-full"
-                placeholder="Optional"
+                placeholder="Optional, e.g. +60123456789"
               />
             </UFormField>
 
diff --git a/docker-compose.dev.yml b/docker-compose.dev.yml
index 8a57509..d61b305 100644
--- a/docker-compose.dev.yml
+++ b/docker-compose.dev.yml
@@ -15,6 +15,9 @@ services:
       NUXT_DATABASE_URL: ${NUXT_DATABASE_URL:-postgresql://postgres:postgres@postgres:5432/dinner_ticket_system}
       NUXT_REDIS_URL: ${NUXT_REDIS_URL:-redis://redis:6379}
       NUXT_SESSION_COOKIE_NAME: ${NUXT_SESSION_COOKIE_NAME:-dinner_ticket_session}
+      NUXT_WHATSAPP_ACCESS_TOKEN: ${NUXT_WHATSAPP_ACCESS_TOKEN:-}
+      NUXT_WHATSAPP_PHONE_NUMBER_ID: ${NUXT_WHATSAPP_PHONE_NUMBER_ID:-}
+      NUXT_WHATSAPP_API_VERSION: ${NUXT_WHATSAPP_API_VERSION:-v23.0}
       NUXT_PUBLIC_APP_URL: ${NUXT_PUBLIC_APP_URL:-http://localhost:20013}
       NUXT_PUBLIC_RP_NAME: ${NUXT_PUBLIC_RP_NAME:-Dinner Ticket System}
     volumes:
diff --git a/docker-compose.yml b/docker-compose.yml
index a2d16dc..aae8a94 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -48,6 +48,9 @@ services:
       NUXT_DATABASE_URL: postgresql://postgres:postgres@postgres:5432/dinner_ticket_system
       NUXT_REDIS_URL: redis://redis:6379
       NUXT_SESSION_COOKIE_NAME: dinner_ticket_session
+      NUXT_WHATSAPP_ACCESS_TOKEN: ${NUXT_WHATSAPP_ACCESS_TOKEN:-}
+      NUXT_WHATSAPP_PHONE_NUMBER_ID: ${NUXT_WHATSAPP_PHONE_NUMBER_ID:-}
+      NUXT_WHATSAPP_API_VERSION: ${NUXT_WHATSAPP_API_VERSION:-v23.0}
       NUXT_PUBLIC_APP_URL: ${NUXT_PUBLIC_APP_URL:-http://localhost:20013}
       NUXT_PUBLIC_RP_NAME: ${NUXT_PUBLIC_RP_NAME:-Dinner Ticket System}
     ports:
diff --git a/nuxt.config.ts b/nuxt.config.ts
index d34a834..fcdadcc 100644
--- a/nuxt.config.ts
+++ b/nuxt.config.ts
@@ -10,6 +10,9 @@ export default defineNuxtConfig({
     databaseUrl: '',
     redisUrl: '',
     sessionCookieName: 'dinner_ticket_session',
+    whatsappAccessToken: '',
+    whatsappPhoneNumberId: '',
+    whatsappApiVersion: 'v23.0',
     public: {
       appUrl: '',
       rpName: 'Dinner Ticket System'
diff --git a/server/api/public/bookings.post.ts b/server/api/public/bookings.post.ts
index fa59a62..399b0df 100644
--- a/server/api/public/bookings.post.ts
+++ b/server/api/public/bookings.post.ts
@@ -7,6 +7,7 @@ import { createBooking } from '../../utils/booking-repository'
 import { buildBookingMessage, parseCreateBookingInput } from '../../utils/bookings'
 import { assertBadRequest } from '../../utils/http'
 import { getPublicContactById } from '../../utils/user-repository'
+import { buildWhatsAppDeepLink } from '../../utils/whatsapp'
 
 export default defineEventHandler(async (event): Promise<CreateBookingResponse> => {
   const body = await readBody<{
@@ -46,7 +47,7 @@ export default defineEventHandler(async (event): Promise<CreateBookingResponse>
 
   const confirmationUrl = buildAppUrl(event, `/confirmation/${confirmationToken}`)
   const whatsappMessage = buildBookingMessage(booking, confirmationUrl)
-  const whatsappUrl = `https://wa.me/${booking.personInChargePhoneNumber}?text=${encodeURIComponent(whatsappMessage)}`
+  const whatsappUrl = buildWhatsAppDeepLink(booking.personInChargePhoneNumber, whatsappMessage)
 
   return {
     booking,
diff --git a/server/api/public/bookings/[token]/confirm.post.ts b/server/api/public/bookings/[token]/confirm.post.ts
index 02a1467..41426b7 100644
--- a/server/api/public/bookings/[token]/confirm.post.ts
+++ b/server/api/public/bookings/[token]/confirm.post.ts
@@ -1,7 +1,10 @@
+import type { ConfirmBookingResponse } from '~~/shared/booking'
+
 import { confirmBookingByConfirmationToken, getBookingByConfirmationToken, getBookingInventorySummary } from '../../../../utils/booking-repository'
 import { getRequiredRouteParam, httpError } from '../../../../utils/http'
+import { sendBookingTicketReceiptViaWhatsApp } from '../../../../utils/whatsapp'
 
-export default defineEventHandler(async (event) => {
+export default defineEventHandler(async (event): Promise<ConfirmBookingResponse> => {
   const token = getRequiredRouteParam(event, 'token', 'Confirmation token')
   const existingBooking = await getBookingByConfirmationToken(token)
 
@@ -12,7 +15,14 @@ export default defineEventHandler(async (event) => {
   if (existingBooking.status === 'confirmed') {
     return {
       booking: existingBooking,
-      alreadyConfirmed: true
+      alreadyConfirmed: true,
+      ticketReceiptWhatsApp: {
+        sent: false,
+        skipped: true,
+        recipientPhone: existingBooking.customerPhone,
+        apiRecipientPhone: existingBooking.customerPhone.replace(/\D/g, ''),
+        error: 'Booking was already confirmed earlier.'
+      }
     }
   }
 
@@ -28,8 +38,11 @@ export default defineEventHandler(async (event) => {
     httpError(404, 'Booking not found')
   }
 
+  const ticketReceiptWhatsApp = await sendBookingTicketReceiptViaWhatsApp(event, booking)
+
   return {
     booking,
-    alreadyConfirmed: false
+    alreadyConfirmed: false,
+    ticketReceiptWhatsApp
   }
 })
diff --git a/server/utils/bookings.ts b/server/utils/bookings.ts
index 49cd1fb..ee9d64e 100644
--- a/server/utils/bookings.ts
+++ b/server/utils/bookings.ts
@@ -26,7 +26,7 @@ export function parseCreateBookingInput(body: {
   const personInChargeId = (body.personInChargeId || '').trim()
 
   assertBadRequest(hasValidFullName(customerName), 'Guest or organizer name must be at least 2 characters')
-  assertBadRequest(isValidPhoneNumber(customerPhone), 'Phone number must contain 8 to 15 digits')
+  assertBadRequest(isValidPhoneNumber(customerPhone), 'Phone number must include a country code, e.g. +60123456789')
   assertBadRequest(isBookingMode(bookingMode), 'Booking mode is invalid')
   assertBadRequest(Number.isInteger(quantity) && quantity >= 1, 'Quantity must be a whole number of at least 1')
   assertBadRequest(isTicketType(ticketType), 'Ticket category is invalid')
@@ -73,7 +73,7 @@ export function parseSeatShareInput(body: {
 
   if (shared) {
     assertBadRequest(!recipientName || hasValidFullName(recipientName), 'Recipient name must be at least 2 characters')
-    assertBadRequest(!recipientPhone || isValidPhoneNumber(recipientPhone), 'Recipient phone number must contain 8 to 15 digits')
+    assertBadRequest(!recipientPhone || isValidPhoneNumber(recipientPhone), 'Recipient phone number must include a country code, e.g. +60123456789')
   }
 
   return {
diff --git a/server/utils/db-init.ts b/server/utils/db-init.ts
index 208e658..12c07fc 100644
--- a/server/utils/db-init.ts
+++ b/server/utils/db-init.ts
@@ -279,7 +279,7 @@ async function initializeDatabase() {
   await sql`
     update users
     set
-      phone_number = '601157753558',
+      phone_number = '+601157753558',
       updated_at = now()
     where username = 'xiaomai'
       and (phone_number is null or phone_number = '')
diff --git a/server/utils/user-repository.ts b/server/utils/user-repository.ts
index 2dfa52f..8a1f7c3 100644
--- a/server/utils/user-repository.ts
+++ b/server/utils/user-repository.ts
@@ -3,6 +3,7 @@ import { randomUUID } from 'node:crypto'
 import type { AuthenticatorTransportFuture, CredentialDeviceType } from '@simplewebauthn/server'
 
 import type { AuthUser, ManagedUser, PasskeySummary, PublicContact, UserRole } from '~~/shared/auth'
+import { normalizePhoneNumber } from '~~/shared/auth'
 
 import { encodeBase64Url, toIsoString } from './base64url'
 import { ensureDatabaseReady } from './db-init'
@@ -80,7 +81,7 @@ function mapAuthUser(row: DbUserRow): AuthUser {
     id: row.id,
     username: row.username,
     fullName: row.full_name,
-    phoneNumber: row.phone_number,
+    phoneNumber: row.phone_number ? normalizePhoneNumber(row.phone_number) : null,
     role: row.role,
     isActive: row.is_active,
     mustChangePassword: row.must_change_password,
@@ -251,7 +252,7 @@ export async function listPublicContacts(): Promise<PublicContact[]> {
   return rows.map((row) => ({
     id: row.id,
     fullName: row.full_name,
-    phoneNumber: row.phone_number || '',
+    phoneNumber: normalizePhoneNumber(row.phone_number || ''),
     role: row.role
   }))
 }
@@ -281,7 +282,7 @@ export async function getPublicContactById(contactId: string): Promise<PublicCon
   return {
     id: row.id,
     fullName: row.full_name,
-    phoneNumber: row.phone_number || '',
+    phoneNumber: normalizePhoneNumber(row.phone_number || ''),
     role: row.role
   }
 }
diff --git a/server/utils/users.ts b/server/utils/users.ts
index aab31e7..00901e4 100644
--- a/server/utils/users.ts
+++ b/server/utils/users.ts
@@ -44,7 +44,7 @@ export function parseCreateUserInput(body: {
     'Username must be 3 to 32 characters using lowercase letters, numbers, dot, dash, or underscore'
   )
   assertBadRequest(hasValidFullName(fullName), 'Full name must be at least 2 characters')
-  assertBadRequest(isValidPhoneNumber(phoneNumber), 'Phone number must contain 8 to 15 digits')
+  assertBadRequest(isValidPhoneNumber(phoneNumber), 'Phone number must include a country code, e.g. +60123456789')
 
   return {
     username,
@@ -64,7 +64,7 @@ export function parseUserProfileInput(body: {
   const role = body.role
 
   assertBadRequest(hasValidFullName(fullName), 'Display name must be at least 2 characters')
-  assertBadRequest(isValidPhoneNumber(phoneNumber), 'Phone number must contain 8 to 15 digits')
+  assertBadRequest(isValidPhoneNumber(phoneNumber), 'Phone number must include a country code, e.g. +60123456789')
   assertBadRequest(isUserRole(role), 'Role is invalid')
 
   return {
diff --git a/server/utils/whatsapp.ts b/server/utils/whatsapp.ts
new file mode 100644
index 0000000..4fa09fc
--- /dev/null
+++ b/server/utils/whatsapp.ts
@@ -0,0 +1,111 @@
+import type { H3Event } from 'h3'
+
+import type { PublicBooking, WhatsAppDeliveryResult } from '~~/shared/booking'
+
+import {
+  DINNER_EVENT_DATE_LABEL,
+  DINNER_EVENT_TIME_LABEL,
+  DINNER_EVENT_TITLE,
+  DINNER_EVENT_VENUE,
+  formatBookingCurrency,
+  getTicketCatalogItem
+} from '~~/shared/booking'
+import { normalizePhoneNumber } from '~~/shared/auth'
+
+import { buildAppUrl } from './app-url'
+
+type WhatsAppMessagesResponse = {
+  messages?: Array<{
+    id?: string
+  }>
+}
+
+export function toWhatsAppPhoneNumber(phoneNumber: string) {
+  return normalizePhoneNumber(phoneNumber).replace(/\D/g, '')
+}
+
+export function buildWhatsAppDeepLink(phoneNumber: string, message: string) {
+  return `https://wa.me/${toWhatsAppPhoneNumber(phoneNumber)}?text=${encodeURIComponent(message)}`
+}
+
+export function buildBookingTicketReceiptMessage(event: H3Event, booking: PublicBooking) {
+  const ticket = getTicketCatalogItem(booking.ticketType)
+  const ticketLabel = ticket?.label || booking.ticketType.toUpperCase()
+  const receiptUrl = buildAppUrl(event, `/receipt/${booking.receiptToken}`)
+
+  return [
+    DINNER_EVENT_TITLE,
+    '',
+    `Hi ${booking.customerName}, your ticket receipt has been confirmed.`,
+    '',
+    `Receipt: ${receiptUrl}`,
+    `Seats: ${booking.seatCount}`,
+    `Ticket Category: ${ticketLabel}`,
+    `Total Price: ${formatBookingCurrency(booking.totalPrice)}`,
+    `Date: ${DINNER_EVENT_DATE_LABEL}`,
+    `Time: ${DINNER_EVENT_TIME_LABEL}`,
+    `Venue: ${DINNER_EVENT_VENUE}`,
+    '',
+    'Please present the QR code from the receipt at the event.'
+  ].join('\n')
+}
+
+export async function sendBookingTicketReceiptViaWhatsApp(
+  event: H3Event,
+  booking: PublicBooking
+): Promise<WhatsAppDeliveryResult> {
+  const recipientPhone = normalizePhoneNumber(booking.customerPhone)
+  const to = toWhatsAppPhoneNumber(recipientPhone)
+  const config = useRuntimeConfig()
+  const accessToken = String(config.whatsappAccessToken || '')
+  const phoneNumberId = String(config.whatsappPhoneNumberId || '')
+  const apiVersion = String(config.whatsappApiVersion || 'v23.0')
+
+  if (!accessToken || !phoneNumberId) {
+    return {
+      sent: false,
+      skipped: true,
+      recipientPhone,
+      apiRecipientPhone: to,
+      error: 'WhatsApp API credentials are not configured.'
+    }
+  }
+
+  try {
+    const response = await $fetch<WhatsAppMessagesResponse>(
+      `https://graph.facebook.com/${apiVersion}/${phoneNumberId}/messages`,
+      {
+        method: 'POST',
+        headers: {
+          Authorization: `Bearer ${accessToken}`
+        },
+        body: {
+          messaging_product: 'whatsapp',
+          recipient_type: 'individual',
+          to,
+          type: 'text',
+          text: {
+            preview_url: true,
+            body: buildBookingTicketReceiptMessage(event, booking)
+          }
+        }
+      }
+    )
+
+    return {
+      sent: true,
+      skipped: false,
+      recipientPhone,
+      apiRecipientPhone: to,
+      messageId: response.messages?.[0]?.id
+    }
+  } catch (error: any) {
+    return {
+      sent: false,
+      skipped: false,
+      recipientPhone,
+      apiRecipientPhone: to,
+      error: error?.data?.error?.message || error?.message || 'WhatsApp API request failed.'
+    }
+  }
+}
diff --git a/shared/auth.ts b/shared/auth.ts
index b9c4eee..04b17e5 100644
--- a/shared/auth.ts
+++ b/shared/auth.ts
@@ -3,6 +3,7 @@ export const MIN_PASSWORD_LENGTH = 8
 export const MIN_FULL_NAME_LENGTH = 2
 export const USERNAME_PATTERN = /^[a-z0-9._-]{3,32}$/
 export const PHONE_NUMBER_PATTERN = /^\+?\d{8,15}$/
+export const DEFAULT_PHONE_COUNTRY_CODE = '+60'
 
 export type UserRole = 'super_admin' | 'staff'
 
@@ -24,7 +25,21 @@ export function normalizePhoneNumber(value: string) {
   const hasPlusPrefix = trimmed.startsWith('+')
   const digitsOnly = trimmed.replace(/\D/g, '')
 
-  return hasPlusPrefix ? `+${digitsOnly}` : digitsOnly
+  if (!digitsOnly) {
+    return ''
+  }
+
+  if (hasPlusPrefix) {
+    return `+${digitsOnly}`
+  }
+
+  const defaultCountryDigits = DEFAULT_PHONE_COUNTRY_CODE.replace(/\D/g, '')
+
+  if (digitsOnly.startsWith(defaultCountryDigits)) {
+    return `+${digitsOnly}`
+  }
+
+  return `+${defaultCountryDigits}${digitsOnly.replace(/^0+/, '')}`
 }
 
 export function isValidPhoneNumber(value: string) {
diff --git a/shared/booking.ts b/shared/booking.ts
index ca68849..d885a95 100644
--- a/shared/booking.ts
+++ b/shared/booking.ts
@@ -116,6 +116,21 @@ export interface CreateBookingResponse {
   whatsappUrl: string
 }
 
+export interface WhatsAppDeliveryResult {
+  sent: boolean
+  skipped: boolean
+  recipientPhone: string
+  apiRecipientPhone: string
+  messageId?: string
+  error?: string
+}
+
+export interface ConfirmBookingResponse {
+  booking: PublicBooking
+  alreadyConfirmed: boolean
+  ticketReceiptWhatsApp: WhatsAppDeliveryResult
+}
+
 export function isBookingMode(value: string | null | undefined): value is BookingMode {
   return value === 'table' || value === 'seat'
 }