Can I vibe code SuperLemon?

Build a lightweight Node.js/TypeScript backend service deployed on Vercel that replaces SuperLemon WhatsApp automation for Shopify.

1. DATA MODEL & STATE MANAGEMENT:
- Use Prisma with PostgreSQL to define:
  - Merchant: storeDomain, shopifyAccessToken, whatsappPhoneId, whatsappAccessToken.
  - AbandonedCart: checkoutId, phone, customerName, totalAmount, checkoutUrl, status (pending, sent, recovered), scheduledAt.
  - NotificationLog: orderId, eventType (order_confirmation, shipping_update, cart_recovery), recipientPhone, status, metaResponseId.
- Integrate Upstash Redis for delayed queue execution (or QStash).

2. SHOPIFY WEBHOOK INTEGRATION:
- Endpoints to handle incoming POST webhooks signed with Shopify secret HMAC verification:
  - `checkouts/create` and `checkouts/update`: If phone number exists and opt-in is true, upsert AbandonedCart. Schedule a delay event for 30 minutes in Redis/QStash.
  - `orders/create`: Cancel any pending abandoned cart schedule for that customer phone/email. Trigger WhatsApp template 'order_confirmation'.
  - `fulfillments/create`: Trigger WhatsApp template 'shipping_update' with tracking link.

3. META WHATSAPP CLOUD API INTEGRATION:
- Implement a module `sendWhatsAppTemplate(phone, templateName, languageCode, components)` calling `https://graph.facebook.com/v18.0/{phone_number_id}/messages`.
- Include pre-formatted payloads matching approved Meta templates for cart recovery, order confirmation, and fulfillment.

4. STOREFRONT WIDGET & OPT-IN:
- Expose a public endpoint `/api/widget-config` returning merchant WhatsApp phone number and preset pre-filled chat text.
- Create a lightweight embeddable JS script to render a floating bottom-right WhatsApp button on the Shopify store.

5. FAILURE HANDLING & COMPLIANCE:
- Handle Meta API error response codes (e.g. rate limit 429, invalid token, unapproved template).
- Check for keyword opt-out (e.g. STOP) in incoming Meta webhooks to blacklist phone numbers from further messages.

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