- Create shipping.ts with flat-rate tiers: UK £10, Europe £25, International £40
- Integrate shipping cost into PayPal order breakdown (item_total + shipping)
- Add server-side shipping calculation in order creation API (prevents tampering)
- Update checkout page to show real-time shipping cost based on country selection
- Add subtotal/shipping/total breakdown to order confirmation page
- Add order confirmation emails via SMTP (customer + Katheryn notification)
- Include shipping breakdown in email templates
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Jeff Emmett
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