Can I vibe code CheckoutJoy?

Build a custom, hosted checkout application in Next.js (App Router) with Node.js backend services designed to process payments via Stripe and Paystack.

1. DATA MODEL & STATE MANAGEMENT:
- Product: id, title, price, currency, image_url, platform_fulfillment_webhook_url.
- Order: id, product_id, customer_email, customer_name, custom_fields (JSON), amount, currency, payment_gateway, gateway_transaction_id, status (pending, paid, failed), created_at.

2. FRONTEND CHECKOUT UI:
- Render a responsive, high-converting payment page accepting product_id as a URL param.
- Collect customer information: Full Name, Email, and dynamic custom text fields.
- Render an order summary section displaying item price, calculated tax, and total.
- Present payment method selection (Credit Card via Stripe Elements, or Regional Payment via Paystack Embed).

3. PAYMENT INTEGRATION & TOKENIZATION:
- Server-side endpoint (/api/checkout/create-intent) to instantiate a Stripe PaymentIntent or Paystack Initialize Transaction object based on user selection.
- Never handle or record raw credit card details on your servers (PCI SAQ-A compliant iframe model).
- Handle client-side submission and manage redirect flows for 3D-Secure authentication.

4. WEBHOOK & FULFILLMENT ORCHESTRATION:
- Secure webhook endpoints (/api/webhooks/stripe and /api/webhooks/paystack).
- Verify incoming cryptographic signatures for each provider before processing.
- Implement idempotent processing using payment_intent_id / transaction_reference to prevent duplicate fulfillments.
- Upon verified payment success, update Order status to 'paid' and dispatch a POST request payload to the product's platform_fulfillment_webhook_url.

5. FAILURE HANDLING & LOGGING:
- Handle failed or canceled transactions by logging reason code and updating Order status to 'failed'.
- Implement automated retry logic with exponential backoff for outgoing fulfillment webhook calls.
- Out of scope: Multi-tenant SaaS billing, automated refund processing, and affiliate tracking management.

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