Can I vibe code AfterSell?

Build a custom embedded Shopify App that replaces AfterSell for post-purchase upsells and thank-you page widgets.

1. DATA MODEL & STACK
- Tech Stack: Node.js, Remix, Prisma, Shopify App Remix Template, TailwindCSS, Shopify Polaris.
- Models:
  - OfferRule: id, name, priority, triggerConditions (JSON: product_ids, min_cart_total), offerVariantId, discountPercentage, active (boolean).
  - AnalyticsEvent: id, offerRuleId, eventType ('impression' | 'accept' | 'decline'), orderId, revenueAdded, createdAt.

2. POST-PURCHASE EXTENSION HOOKS
- Implement a Shopify Post-Purchase UI Extension.
- Fetch rules via Shopify Admin GraphQL on payment authorization.
- If trigger conditions match cart items, intercept payment confirmation and render the post-purchase upsell UI extension screen.
- Provide simple binary choices: 'Add to Order with X% Discount' or 'No Thanks'.
- On accept: Call Shopify Post-Purchase API 'addChanges' to append variant to existing order token and capture additional funds seamlessly.
- On decline/accept: Forward buyer to native Thank You page.

3. THANK-YOU PAGE CHECKOUT EXTENSION
- Build a Checkout UI Extension targeted at 'purchase.thank-you.block.render'.
- Display a responsive dynamic widget: recommended products based on purchased collection, custom promo code banner with countdown timer, and customer survey block.

4. ADMIN DASHBOARD
- Embedded Polaris dashboard displaying conversion rate, extra revenue generated, and active offer management.
- Simple CRUD interface for defining offer rules (Trigger Product -> Target Upsell Variant -> Discount %).

5. FAILURE MODES & EDGE CASES
- If Shopify API times out (>2000ms), immediately pass-through the order to thank-you page without showing upsell.
- Gracefully handle out-of-stock scenarios for target upsell variants.
- Handle multi-currency store display by relying on Shopify's presentment currency context.

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