Can I vibe code PayKickstart?

Build a full-stack checkout engine using Next.js 14, Stripe Billing API, and PostgreSQL (Prisma ORM) to replace PayKickstart.

1. DATA MODEL:
- Customer: id, email, stripe_customer_id, created_at.
- Product: id, name, type (one_time, recurring), price_cents, interval (month, year).
- Order: id, customer_id, product_id, total_cents, status, affiliate_id, created_at.
- Affiliate: id, code, payout_paypal_email, commission_rate (percentage).
- Commission: id, affiliate_id, order_id, amount_cents, status (pending, paid).

2. CHECKOUT FLOW:
- Render a multi-step checkout form accepting email, billing address, and credit card via Stripe Elements.
- Support inline 'Order Bumps' (checkbox to append an extra digital product to the PaymentIntent before confirmation).
- Implement one-click post-purchase upsell pages: render an intermediate route after primary payment confirmation using Stripe PaymentIntents with stored payment methods.

3. SUBSCRIPTION & DUNNING:
- Process Stripe Webhooks: customer.subscription.created, customer.subscription.updated, invoice.payment_failed, invoice.payment_succeeded.
- Send automated dunning emails via Resend on invoice.payment_failed containing a secure link to a self-service Stripe Customer Portal.

4. AFFILIATE ENGINE:
- Parse query parameter ?ref=CODE on page land, saving affiliate_id to a 30-day HTTP-only secure cookie.
- On checkout completion webhook, verify cookie, calculate commission, and record a row in the Commission table.
- Expose an affiliate dashboard showing link clicks, total referred sales, and pending vs paid commissions.

5. FAILURE MODES & OUT OF SCOPE:
- Handle duplicate webhooks using an idempotency key store in Redis.
- Out of scope: Physical shipping label generation, multi-vendor split settlements, manual tax exemption certificates.

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