Can I vibe code CartX?

Build a custom post-purchase upsell web application using Next.js (App Router), Tailwind CSS, and Node.js.

1. DATA MODEL:
- Store: id, name, apiKey, checkoutConfig.
- Offer: id, storeId, triggerProductId, upsellProductId, discountPercentage, targetStep.
- OrderState: id, cartToken, initialOrderId, customerEmail, paymentToken, status (pending, offer_shown, completed).

2. CORE FUNCTIONALITY:
- Intercept post-purchase checkout redirects using a serverless middleware function.
- Render a high-speed post-purchase modal displaying target upsellProduct with dynamic price calculations.
- Integrate Stripe Elements / Mercado Pago SDK for tokenized payment capture.
- Provide a '1-Click Accept' button that charges the vaulted token via API and appends the upsell product to the original order.
- Provide a 'Decline' button that instantly routes the customer to the final order confirmation page.

3. INTEGRATIONS & UTILITIES:
- Implement CPF/CNPJ regex validation for Brazilian tax ID fields if present.
- Handle asynchronous webhook listeners for immediate payment status (e.g., PIX/Credit card approvals).

4. FAILURE MODES & OUT OF SCOPE:
- If token charge fails, gracefully fallback to displaying an embedded card input modal without canceling the base order.
- Exclude raw credit card storage; rely entirely on tokenized gateway payloads to remain out of PCI-DSS scope.

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