Can I vibe code Kangaroo Rewards?

Build a custom, lightweight loyalty program microservice for a Shopify store using Node.js, Fastify, PostgreSQL, and Prisma ORM. 1. Data Model: Define Customer (shopify_customer_id, points_balance, lifetime_points, current_tier_id), PointsTransaction (id, customer_id, points_change, reason, reference_id, created_at), VIPTier (id, name, min_points, point_multiplier), and RewardRule (id, title, cost_in_points, discount_value, discount_type). 2. Shopify Integration: Create an endpoint listening to Shopify 'orders/paid' webhooks. Verify HMAC signatures. Extract subtotal price, calculate points earned based on current VIPTier multiplier, execute a database transaction creating a PointsTransaction and updating Customer balances, and check if the user qualifies for a VIP Tier upgrade. 3. Storefront API & Redemption: Build a public API endpoint authenticated via signed JWT stored in local storefront storage. Expose endpoints: GET /loyalty/profile returning current balance and eligible tiers, and POST /loyalty/redeem accepting reward_rule_id. For redemptions, verify the point balance, deduct points atomically in Postgres, call Shopify REST Admin API to generate a single-use PriceRule/DiscountCode, and return the code string to the client. 4. Customer Widget UI: Build a vanilla JavaScript/Shadow DOM widget embedded via Shopify App Proxy. Render current balance, progress bar to the next VIP Tier, points history table, and 'Redeem Points' buttons that instantly convert points to discount codes. 5. Failure Modes & Edge Cases: Implement idempotent processing on Shopify order webhooks using Shopify order_id as the reference_id to avoid double-crediting. Handle order refunds by listening to 'refunds/create' webhooks and clawing back earned points, permitting negative balances if points were already spent. Out of scope: Physical POS terminal hardware sync and cross-brand promotional gift cards.

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