Issue #1: Create Demo Merchant Website (Louis Buitton)

[achneerov]

Description: Build a complete demo e-commerce website to showcase the AuthPay integration workflow.
Requirements:
Pages to Implement:

• Items Page: Display products for purchase
• Cart Page: Show selected items with non-sensitive checkout data (address, etc.)
• Fake Stripe Payment Page: Mock payment interface with standard CC input fields
  Payment Flow:

1. User adds items to cart and proceeds to checkout
2. User enters shipping/billing information
3. On "Proceed to Checkout", redirect to fake Stripe page
4. User enters credit card information
5. If authpay.js is imported:
   • Override process_payment() method
   • Call waitForAuth() function
   • Make backend call to process transaction
   • Handle three response states:
     • SUCCESS: Redirect to order confirmation page
     • FAILURE: Show "Transaction cancelled, please contact merchant"
     • AUTH_REQUIRED: Open MFA modal
       MFA Modal:

• Display dynamic authentication options based on backend response (array of auth method IDs)
• Show dropdown for user to select authentication method (email/phone/etc.)
• "Request Code" button to trigger code generation
• 6-digit code input field
• Call verifyMFA(ccHash, code) endpoint
• Handle SUCCESS/FAILURE/AUTH_REQUIRED responses
  Technical Details:
• Implement client-side CC hashing function for security
• Use webhook integration for backend communication
• Ensure authpay.js properly overrides payment methods