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Build a full-stack customer feedback and review routing web application using Next.js (App Router), TypeScript, Tailwind CSS, Supabase, and Resend API. 

1. DATA MODEL:
Create database tables for:
- merchants: id, shopify_domain, store_name, contact_email, delay_days (default 7), star_threshold (default 4), target_review_url (e.g., Google/Trustpilot link).
- orders: id, merchant_id, shopify_order_id, customer_email, customer_name, fulfilled_at, scheduled_email_at, status ('pending', 'sent', 'cancelled').
- feedback: id, order_id, rating (1-5), comment, routed_external (boolean), created_at.

2. WEBHOOK & QUEUE SYSTEM:
- Expose an API endpoint POST /api/webhooks/shopify/order-fulfilled.
- On payload receipt, record order details and calculate scheduled_email_at by adding merchant.delay_days to fulfilled_at.
- Implement a Cron endpoint GET /api/cron/send-requests processing pending orders where scheduled_email_at <= NOW(). Send a transactional review request email via Resend containing a unique single-use tokenized landing page URL.

3. FEEDBACK ROUTING LANDING PAGE:
- Create a public route /feedback/[token].
- Display a 5-star rating widget.
- If rating >= merchant.star_threshold (e.g., 4 or 5 stars), log the feedback, mark routed_external=true, and redirect the user immediately to merchant.target_review_url.
- If rating < merchant.star_threshold (e.g., 1-3 stars), render an internal text area for private customer feedback. Upon submit, record comment, mark routed_external=false, send an alert email to merchant.contact_email, and present a polite thank-you message.

4. MERCHANT DASHBOARD:
- Build an authenticated dashboard to let merchants set delay_days, threshold, external review link, view aggregate score stats, and review low-rating feedback submissions.

5. FAILURE HANDLING & CONSTRAINTS:
- Store token usage state to prevent duplicate survey submissions.
- Respect email unsubscribes via a standard opt-out footer link.
- Plain text, clean TypeScript code, no external UI component libraries except Lucide icons.

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