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Build a custom Shopify loyalty and rewards app using Next.js, Postgres (Prisma), and the Shopify Admin GraphQL API. 

1. DATA MODEL:
Create tables for:
- `customers`: shopify_customer_id (unique string), email, total_points (integer), current_tier_id, created_at.
- `points_ledger`: id, customer_id, points (integer, positive or negative), reason (enum: PURCHASE, REFERRAL, REDEMPTION, ADJUSTMENT), reference_id (order_id or coupon_code), created_at.
- `tiers`: id, name, spend_threshold (decimal), point_multiplier (float).
- `referrals`: id, referrer_customer_id, referee_email, status (PENDING, COMPLETED), referral_code (unique string).

2. WEBHOOK HANDLERS:
Implement verified Shopify webhook listeners for:
- `orders/create`: Calculate net purchase total (subtotal minus discounts). Check if customer exists; if not, create them. Apply current tier multiplier to total spend, compute earned points, add to `total_points`, and insert record in `points_ledger`. Check if order used a pending referral code; if valid, grant bonus points to both referrer and referee.
- `refunds/create`: Calculate points associated with refunded items and deduct them from `total_points` and log negative adjustment in `points_ledger`.

3. REDEMPTION & SHOPIFY API INTEGRATION:
Create an API route `/api/redeem` exposed to authenticated storefront sessions:
- Accepts `shopify_customer_id` and `reward_tier_points` (e.g., 500 points = $5).
- Atomically verifies customer has sufficient balance, deducts points, and logs transaction.
- Calls Shopify Admin GraphQL API `discountCodeBasicCreate` to generate a single-use discount code worth the corresponding value.
- Returns code to storefront UI.

4. FRONTEND STOREFRONT WIDGET:
Create a lightweight Web Component script that can be embedded into a Shopify Liquid account template. It fetches customer balance from `/api/customer-balance` using a secure JWT signed by customer email/ID, renders total points, current tier status, referral link, and a 'Redeem $5 Discount' button.

5. OUT OF SCOPE:
Do not build mobile wallet passes, spin-to-win games, or third-party review platform integrations.

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