#checkout

Build a conversion-optimized checkout experience. Requirements: 1. Three-step progress indicator (Information → Shipping → Payment). 2. Auto-save form data to localStorage with debouncing. 3. Real-time address validation using Google Places API. 4. Dynamic shipping cost calculator based on location. 5. Express checkout options (Apple Pay, Google Pay). 6. Trust badges and security indicators. 7. Mobile-first responsive design with sticky CTA. 8. Abandoned cart recovery email trigger. Use React Hook Form for validation and Stripe for payment processing.