Can I vibe code Tray?

Build a localized Brazilian e-commerce backend service using Node.js, Express, and PostgreSQL.

1. DATA MODEL:
- Products: id, title, slug, description, price_cents, weight_grams, dimensions (length, width, height), stock_quantity.
- Customers: id, full_name, email, cpf_cnpj, phone, address_json (cep, street, number, neighborhood, city, state).
- Orders: id, customer_id, items_json, total_cents, shipping_cost_cents, payment_status (pending, paid, cancelled), payment_method (pix, credit_card, boleto), external_payment_id.
- FreightQuotes: cache table for CEP shipping calculations.

2. CORE FUNCTIONALITY:
- Public API endpoints to list products and calculate live shipping quotes using a mock Correios/Frenet API based on target CEP (postal code).
- Checkout endpoint that validates customer CPF/CNPJ and address payload.
- Generate PIX payments via Mercado Pago API integration: return copy-and-paste payload and base64 QR code image.
- Handle payment webhooks: update order status to 'paid' upon receiving confirmed payment event and deduct product stock inventory.
- Expose an export endpoint returning order details formatted for Bling/Tiny ERP order ingestion.

3. FAILURE MODES TO HANDLE:
- Webhook idempotency: Ensure repeated payment webhooks do not double-deduct stock or update state twice.
- Out-of-stock race conditions: Use database transactions with row-level locks when placing orders.
- Invalid CEP lookup: Provide clear fallback shipping rates if external freight calculation APIs fail or timeout.

4. OUT OF SCOPE:
- Multi-tenant admin UI builder.
- Bi-directional real-time stock sync across multiple foreign marketplaces.
- Full native tax invoice (NFe) XML generation engine (rely on ERP export format).

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