Feature: Add WhatsApp notifications for collection-ready orders

- Implement WhatsApp Business API integration via Meta Cloud API
- Add phoneNumber field to Order model for storing customer phone numbers
- Update admin order detail page with phone number input for collection orders
- Send WhatsApp notification when admin marks order as ready for collection
- Add WhatsApp service module with phone number formatting and message sending
- Create database migrations for collection-related fields
- Add WhatsApp credentials to .env configuration

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

src/app/api/checkout/route.ts

@@ -56,11 +56,34 @@ export async function POST(req: Request) {
     cleanupPendingOrders().catch((err) => console.error('Cleanup error:', err));
 
     const body = await req.json();
-    console.log('Checkout request received with items:', body.items?.length, 'customerId:', body.customerId);
+    console.log('Checkout request received with items:', body.items?.length, 'customerId:', body.customerId, 'isCollection:', body.isCollection);
     const items: CheckoutCartItem[] = body.items ?? [];
     const guest: GuestInfo | undefined = body.guest;
     const shippingCountry: string = body.shippingCountry ?? 'GB';
     const shippingService: string | undefined = body.shippingService;
+    const isCollection: boolean = body.isCollection ?? false;
+    const customer = await getCurrentCustomer();
+    const checkoutEmail = guest?.email ?? customer?.email;
+
+    // Delete any other recent PENDING orders for this email to avoid duplicates
+    if (checkoutEmail) {
+      try {
+        const deletedCount = await prisma.order.deleteMany({
+          where: {
+            email: checkoutEmail,
+            status: 'PENDING',
+            createdAt: {
+              gte: new Date(Date.now() - 2 * 60 * 60 * 1000), // Within last 2 hours
+            },
+          },
+        });
+        if (deletedCount.count > 0) {
+          console.log(`Cleaned up ${deletedCount.count} duplicate pending order(s) for ${checkoutEmail}`);
+        }
+      } catch (err) {
+        console.error('Error deleting duplicate pending orders:', err);
+      }
+    }
 
     if (items.length === 0) {
       return NextResponse.json({ error: 'Your bag is empty.' }, { status: 400 });
@@ -95,11 +118,15 @@ export async function POST(req: Request) {
 
     const subtotal = pricedItems.reduce((sum, i) => sum + i.unitPrice * i.quantity, 0);
 
-    // Calculate shipping cost
+    // Calculate shipping cost (skip for collection orders)
     let shippingCost = 0;
     let selectedShippingService = shippingService;
 
-    try {
+    if (isCollection) {
+      console.log('Collection order - no shipping cost');
+      selectedShippingService = null;
+    } else {
+      try {
       // Calculate total weight from cart items
       let totalWeightGrams = 0;
       for (const item of items) {
@@ -138,9 +165,9 @@ export async function POST(req: Request) {
       // Default shipping cost if calculation fails
       shippingCost = 500; // £5.00
     }
+    }
 
     const total = subtotal + shippingCost;
-    const customer = await getCurrentCustomer();
 
     // Save the order up front, before redirecting to Stripe — this is what makes
     // the design files (and the order itself) retrievable afterward, whether or
@@ -156,6 +183,7 @@ export async function POST(req: Request) {
         email: guest?.email ?? customer?.email,
         guestName: guest?.name,
         guestPhone: guest?.phone,
+        isCollectionPickup,
         items: {
           create: pricedItems.map((i) => ({
             productId: i.productId,