Can I vibe code Subbyx?

Build a Shopify Embedded Subscription Management App using Remix, TypeScript, Prisma, and the Shopify App SDK.

Data Model:
1. Subscription Plan: ID, title, merchantID, interval (DAY, WEEK, MONTH), intervalCount, discountType (PERCENTAGE, FIXED), discountValue.
2. Subscription Contract: ID, shopifyContractId, customerId, status (ACTIVE, PAUSED, CANCELLED), nextBillingDate, paymentMethodToken, addressJson.
3. Subscription Line Item: ID, contractId, shopifyVariantId, quantity, currentPrice.

Core Features:
1. Shopify Admin UI:
   - Create and edit Subscription Plans mapping to Shopify Selling Plan Groups via GraphQL Admin API (`sellingPlanGroupCreate`).
   - Dashboard displaying active contracts, MRR, and churn rates.
2. Storefront Integration:
   - Widget rendered on product pages displaying purchase options (One-time vs Subscription) linked to Shopify Selling Plans.
3. Customer Portal:
   - Embedded UI using Shopify Customer Account API or App Proxy.
   - Allows customers to pause, resume, skip next order, or update shipping addresses on active Subscription Contracts via `subscriptionContractUpdate` mutation.
4. Billing & Order Automation:
   - Webhook listener for `subscription_contracts/create` and `orders/paid`.
   - Scheduled cron job processing upcoming billing dates via `subscriptionBillingAttemptCreate` GraphQL mutation.
   - Retry engine for failed payment attempts with exponential backoff (1 day, 3 days, 7 days) before marking contract PAUSED.

Out of Scope:
- Custom payment gateway integration outside Shopify Payments/Stripe.
- Physical mystery box allocation logic.
- Native mobile app SDKs.

Failure Modes to Handle:
- Webhook signature validation failures.
- Shopify API rate limiting (implement GraphQL query cost throttling and queue system via BullMQ/Redis).
- Expired or revoked payment tokens handling without throwing unhandled exceptions.

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