Can I vibe code PayWhirl?

Build a production-ready recurring billing and subscription management service for a custom e-commerce store using Node.js, Express, PostgreSQL, and Stripe API.

1. DATA MODEL:
- Create tables for: Customers (id, email, stripe_customer_id), Subscriptions (id, customer_id, stripe_subscription_id, status, plan_id, next_billing_date, pause_until), SubscriptionItems (id, subscription_id, product_sku, quantity), BillingLogs (id, subscription_id, stripe_invoice_id, status, amount, created_at).

2. CORE FUNCTIONALITY:
- Create an API endpoint to generate a Stripe Checkout session in subscription mode with flexible frequencies (weekly, monthly).
- Build customer self-serve endpoints allowing users to: (a) Pause subscriptions for N cycles, (b) Skip the next billing date, (c) Update item quantities, (d) Cancel subscriptions.
- Integrate Stripe Webhooks for: invoice.paid, invoice.payment_failed, customer.subscription.updated, and customer.subscription.deleted.
- On invoice.paid, update subscription next_billing_date and insert a record into BillingLogs.

3. DUNNING & RETRY LOGIC:
- Implement smart retries on invoice.payment_failed: send automated transactional emails via SendGrid notifying the user to update their payment method, and schedule automatic retry triggers after 3, 7, and 14 days before marking the subscription 'unpaid'.

4. SECURITY & INTEGRITY:
- Enforce idempotency on all webhook receivers using Stripe-Signature validation and a processed_webhooks table.
- Never store raw payment card data locally; process all vaulting operations through Stripe Tokens.

5. OUT OF SCOPE:
- Multi-currency rate conversion, physical inventory tracking, non-Stripe payment processors.

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