Can I vibe code Charles?

Build a full-stack WhatsApp commerce and support web application for Shopify merchants using Next.js App Router, Tailwind CSS, PostgreSQL, Prisma, and the official Meta WhatsApp Cloud API.

CORE ENTITIES & DATA MODEL:
- Merchant (id, shopifyDomain, shopifyAccessToken, whatsappPhoneId, whatsappBusinessAccountId, metaAccessToken)
- Customer (id, phone, shopifyCustomerId, optInStatus, optInTimestamp, optInSource, metadata)
- Conversation (id, customerId, status [open, pending, closed], assignedAgentId, lastMessageAt)
- Message (id, conversationId, direction [inbound, outbound], type [text, template, interactive], content, metaMessageId, deliveryStatus)
- Campaign (id, name, templateName, templateLanguage, targetSegment, scheduledAt, status)
- Flow (id, name, triggerType, nodesJson, isActive)

REQUIRED INTEGRATIONS:
1. Meta WhatsApp Cloud API: Handle inbound webhooks (messages, statuses) and send outbound messages/templates. Implement signature validation for security.
2. Shopify Admin API: Sync customer profiles, fetch past orders, generate draft orders, and attach custom discount codes to checkout URLs sent over WhatsApp.

KEY FUNCTIONALITY:
1. Multi-Agent Shared Inbox: Real-time update of messages via WebSocket/Server-Sent Events. Ability to assign conversations, add internal notes, send product cards, and share checkout links directly into the chat.
2. Campaign Broadcast Engine: Process target customer segments in background jobs (Redis/BullMQ) to dispatch approved Meta WhatsApp templates within rate limits.
3. Chat-In / Opt-in Engine: API endpoint to log explicit GDPR consent events with timestamp, IP, and source code when a customer initiates chat via popup or web link.
4. Flow Execution Engine: Trigger state-machine workflows based on incoming keywords or Shopify webhooks (e.g., Abandoned Checkout -> wait 30m -> check opt-in -> send interactive message).

FAILURE MODES TO HANDLE:
- Meta API Rate Limits: Implement exponential backoff and queueing for broadcast messaging.
- Template Rejection: Store template status updates from Meta webhooks and warn the merchant if a campaign uses an unapproved or paused template.
- Invalid Opt-In: Refuse to dispatch outbound marketing templates to customers without verified optInStatus = true.

OUT OF SCOPE:
- Native iOS/Android apps (web responsive only).
- Voice calls or video call handling via Meta API.
- Payment processing directly inside the WhatsApp chat window (redirect to Shopify checkout).

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