Can I vibe code SendOwl?

Build a digital product delivery SaaS alternative to SendOwl using Next.js App Router, Tailwind CSS, PostgreSQL (Prisma), Stripe API, and Cloudflare R2 object storage.

1. DATA MODEL:
- Create Products table (id, title, price, file_key_r2, max_downloads, link_expiration_hours, product_type: 'FILE' | 'PDF_STAMP' | 'LICENSE_KEY').
- Create LicenseKeys table (id, product_id, key_code, is_claimed, order_id).
- Create Orders table (id, stripe_checkout_id, customer_email, product_id, download_token, download_count, created_at).

2. CHECKOUT INTEGRATION:
- Implement a API endpoint `/api/checkout` that creates a Stripe Checkout Session for a given product ID.
- Configure Stripe Webhook (`/api/webhooks/stripe`) for `checkout.session.completed` event.
- On payment success: create Order record, generate unique cryptographic download_token, assign an unclaimed license key if applicable, and trigger purchase confirmation email via Resend API containing `/download/[token]` link.

3. DIGITAL FILE SERVING & SECURITY:
- Build the dynamic download page route `/download/[token]`.
- Validate token against database: return error if `download_count >= max_downloads` or if creation timestamp exceeds `link_expiration_hours`.
- If product_type is FILE, generate a Cloudflare R2 presigned GET URL (15-minute expiration) and redirect client.
- If product_type is PDF_STAMP, retrieve PDF from R2, use `pdf-lib` to stamp 'Licensed to [customer_email] - Order #[id]' on footer of each page, and stream response with header `Content-Type: application/pdf`.

4. FAILURE MODES & SECURITY:
- Webhook endpoint must verify Stripe signature and guarantee idempotency using Stripe Event ID.
- Increment `download_count` inside atomic database transaction to avoid race-condition downloads.
- Render clear user error pages for expired links with a button to request a fresh link email.

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