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Build a custom subscription billing middleware and product review micro-service for a Webflow Ecommerce store using Next.js (App Router), Supabase, and Stripe Billing.

1. ARCHITECTURE & DATA MODEL
- Database (Supabase PostgreSQL):
  - Create 'subscriptions' table: id, user_email, stripe_customer_id, stripe_subscription_id, status, plan_id, current_period_end.
  - Create 'reviews' table: id, product_id, reviewer_name, reviewer_email, rating (1-5), comment, status ('pending', 'approved'), created_at.

2. SUBSCRIPTION ENGINE & STRIPE INTEGRATION
- Webflow Front-end Embed: Provide a lightweight JS script widget that injects a 'Subscribe' button next to Webflow product pages. On click, call API endpoint '/api/checkout' to generate a Stripe Checkout session in subscription mode.
- Stripe Webhooks Endpoint ('/api/webhooks/stripe'):
  - Handle 'customer.subscription.created', 'customer.subscription.updated', 'customer.subscription.deleted'.
  - On successful recurring payment ('invoice.payment_succeeded'):
    - Call Webflow REST API (POST /v2/sites/{site_id}/orders) to create a fulfillment order in Webflow automatically.
    - Update 'subscriptions' table state in Supabase.
  - Handle 'invoice.payment_failed' by updating DB status and triggering transactional email via Resend API to inform customer to update payment details.
- Customer Portal Endpoint ('/api/portal'): Authenticate user email via magic link, then generate a Stripe Customer Portal session URL redirecting customers to manage/cancel subscriptions.

3. REVIEW SYSTEM
- API Endpoint ('/api/reviews'):
  - POST /api/reviews: Accept product_id, reviewer_name, reviewer_email, rating, comment. Default status to 'pending'.
  - GET /api/reviews?product_id={id}: Return JSON array of 'approved' reviews with computed aggregate rating.
- Embed Script: Create a front-end script that loads on Webflow product pages, fetches reviews from GET /api/reviews, renders star UI, and appends a review submit form.

4. FAILURE HANDLING & SAFETY
- Idempotency: Verify Stripe event ID before processing webhooks to avoid duplicate Webflow order creations.
- API Retries: Implement exponential backoff when posting orders to Webflow REST API to handle HTTP 429 rate limit responses.

5. OUT OF SCOPE
- Native Webflow App Store OAuth logic (store environment variables directly in Vercel).
- Multi-currency conversion logic (rely on Stripe's native multi-currency checkout capability).

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