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plan.md

Travel Checkout App Refactoring Plan

Overview

Transform the current checkout app into a modern, realistic demo with proper data management, improved UX, and better code organization.

🚀 Current Status

  • ✅ Application Restored: Working React-based travel checkout app with demo modal and 3-tour landing page
  • ✅ Task 1.1 Completed: Configuration file created and implemented
  • ✅ Task 1.2 Completed: Utility functions implemented with Base64 encoding, localStorage helpers, image caching, and comprehensive error handling
  • ✅ Task 1.3 Completed: Full demo modal implementation with first-time visitor detection, encoded localStorage, fade animations, accessibility features, and comprehensive event handling
  • 🧪 Test Mode Added: Click "🧪 Test Utility Functions" on landing page to verify utility functions work correctly
  • 📱 Current Features: Demo modal (first-time only) → Landing page with 3 tours → Tour selection → Basic navigation
  • 🎯 Phase 1 Complete: Infrastructure & Configuration phase fully implemented

API Flow Understanding

Server Base URL: https://server.zenithpayments.support User Journey: Landing Page → Tour Selection → Form Page → Payment Flow API Calls:

  1. GET https://server.zenithpayments.support/api/v1/tour/{id} - Load tour + set security cookies
  2. POST https://server.zenithpayments.support/api/v1/create-nonce - Get single-use nonce (CSRF + bot check)
  3. POST https://server.zenithpayments.support/api/v1/payment/exchange-nonce - Get payment fingerprint
  4. Client-side ZenPay initialization
  5. Server callback (no frontend involvement)

PHASE 1: INFRASTRUCTURE & CONFIGURATION

✅ Task 1.1: Create Configuration File

File: /js/config.js

Subtasks:

  • Create config.js file with export structure
  • Add server configuration:
    • SERVER_BASE_URL: 'https://server.zenithpayments.support'
    • API_BASE_PATH: '/api/v1'
  • Update API endpoints:
    • TOUR_ENDPOINT: '/tour/' (will be: /api/v1/tour/{id})
    • NONCE_ENDPOINT: '/create-nonce' (will be: /api/v1/create-nonce)
    • EXCHANGE_ENDPOINT: '/payment/exchange-nonce' (will be: /api/v1/payment/exchange-nonce)
  • Move external library URLs:
    • jQuery URL: 'https://code.jquery.com/jquery-3.6.0.min.js'
    • Bootstrap CSS: 'https://cdn.jsdelivr.net/npm/bootstrap@5.1.3/dist/css/bootstrap.min.css'
    • Bootstrap JS: 'https://cdn.jsdelivr.net/npm/bootstrap@5.1.3/dist/js/bootstrap.bundle.min.js'
    • ZenPay plugin URL: 'https://payuat.travelpay.com.au/online/v5/js/zp-payment-bs5.js'
    • ZenPay CSS: 'https://payuat.travelpay.com.au/online/v5/css/zp-payment-bs5.css'
  • Add default form values:
    • Default payment mode, display mode
    • Default customer data structure
    • Merchant configuration
  • Add demo modal configuration:
    • Modal title, message text
    • Storage keys for demo acknowledgment
    • Modal styling configuration
  • Add tour configuration:
    • Default tour IDs for landing page
    • Image cache settings (expiration time, max size)
    • Loading states configuration
  • Export configuration object as default export

✅ Task 1.2: Create Utilities File

File: /js/utils.js

Subtasks:

  • Create utils.js file with proper exports
  • Implement encoding/decoding functions:
    • encodeForStorage(data) - Base64 encoding only (no obfuscation as requested)
    • decodeFromStorage(encodedData) - Reverse decoding with error handling
    • Add validation for corrupted data (Base64 format validation)
  • Implement localStorage helpers:
    • setStorageItem(key, value, encode=true) - Store with optional encoding
    • getStorageItem(key, decode=true) - Retrieve with optional decoding
    • removeStorageItem(key) - Safe removal with error handling
    • clearAllStorageItems(prefix) - Clear items by prefix (returns count)
  • Implement image caching utilities:
    • cacheImage(url, key) - Fetch image, convert to base64, store (500KB limit)
    • getCachedImage(key) - Retrieve base64 image from storage
    • isCacheExpired(key, maxAge) - Check if cached item is expired (default 7 days)
    • clearImageCache() - Remove all cached images
    • getCacheSize() - Calculate total cache size in bytes
  • Implement cookie utilities:
    • getCookie(name) - Extract cookie value by name
    • getXSRFToken() - Specifically get XSRF-TOKEN cookie
    • parseCookies() - Parse all cookies into object
  • Implement API helpers:
    • buildApiUrl(endpoint) - Construct full API URL
    • getDefaultHeaders() - Get common request headers
    • handleApiError(response) - Standardized error handling
  • Implement validation utilities:
    • validateEmail(email) - Email format validation
    • validatePhone(phone) - Phone number validation
    • validateRequired(value) - Required field validation
  • Export all utility functions

✅ COMPLETED - All utility functions implemented with Base64-only encoding, comprehensive error handling, and test functionality added to main app.

✅ Task 1.3: Demo Modal Implementation

Location: Main app initialization

Subtasks:

  • Create demo modal component in main app:
    • Add modal HTML structure using React.createElement
    • Create dark overlay (position: fixed, z-index: 9999)
    • Center modal container with responsive sizing
  • Implement first-time visitor detection:
    • Check encoded localStorage for demo acknowledgment
    • Use storage key: btoa('zenith_demo_ack_v1')
    • Handle corrupted/invalid storage data gracefully
  • Create modal UI elements:
    • Modal header with title: "ZenPay Security Demo"
    • Modal body with explanation text (see content below)
    • Modal footer with "Got it!" button
    • Close button (X) in top-right corner
    • Professional styling matching app theme
  • Implement modal logic:
    • Show modal before any other UI renders
    • Prevent background interaction (pointer-events: none)
    • Store acknowledgment when dismissed
    • Fade-in/fade-out animations (CSS transitions)
  • Add demo explanation content:
    • "This is a demonstration of ZenPay's secure payment flow"
    • "You'll see how single-use nonces and CSRF tokens protect transactions"
    • "This is a safe testing environment - no real payments will be processed"
    • "Click 'Got it!' to continue to the tour selection"
  • Add modal event handlers:
    • Button click handler to dismiss modal
    • Escape key handler to close modal
    • Click outside modal to close (optional)
  • Add accessibility features:
    • Focus trap within modal (body overflow hidden)
    • ARIA labels and roles (dialog, modal, labelledby, describedby)
    • Keyboard navigation support (Escape key)

✅ COMPLETED - Full demo modal implementation with first-time visitor detection, encoded localStorage, fade animations, accessibility features, and comprehensive event handling.

PHASE 2: FILE STRUCTURE REORGANIZATION

✅ Task 2.1: Split Landing Page Component

File: /js/landing-page.js

Subtasks:

  • Create landing-page.js file with proper imports
  • Import required dependencies:
    • Import config from './config.js'
    • Import utils from './utils.js'
    • Import React components from window.TravelCheckout
  • Define tour data structure:
    • Create array of 3 tour objects with IDs
    • Tour IDs: 'tour_paris_explorer', 'tour_tokyo_adventure', 'tour_sydney_harbor'
    • Include fallback data for offline mode
  • Implement tour data loading:
    • loadTourData(tourId) function
    • Call GET https://server.zenithpayments.support/api/v1/tour/{id}
    • Handle CORS and credentials properly
    • Store response data in component state
    • Cache successful responses
  • Create 3-card layout structure:
    • Container div with 100% width
    • CSS Grid: grid-template-columns: 1fr 1fr 1fr
    • Equal height cards with align-items: stretch
    • Responsive breakpoints for mobile/tablet
  • Implement individual card component:
    • Card container with hover detection
    • Hero image with lazy loading
    • Title, description, price display
    • "Select Tour" call-to-action button
    • Loading state placeholder
  • Add hover effects:
    • CSS transitions: transition: all 0.3s ease
    • Hovered card: transform: scale(1.02), enhanced shadow
    • Non-hovered cards: opacity: 0.6, reduced scale
    • Smooth state transitions
  • Implement image caching:
    • Check localStorage before fetching images
    • Convert images to base64 and cache
    • Handle cache expiration (7 days)
    • Fallback to direct URL if caching fails
  • Add loading states:
    • Skeleton cards while loading tour data
    • Progressive image loading
    • Error states for failed API calls
  • Implement click handlers:
    • Card click handler to select tour
    • Pass selected tour data to parent component
    • Trigger navigation to form page
  • Add responsive design:
    • Mobile: Single column layout
    • Tablet: Two column layout
    • Desktop: Three column layout
    • Touch-friendly sizing for mobile
  • Export renderLandingPage(onTourSelect, loadingState) function

✅ Task 2.2: Split Form Page Component

File: /js/form-page.js

Subtasks:

  • Create form-page.js file with proper imports
  • Import required dependencies:
    • Import config from './config.js'
    • Import utils from './utils.js'
    • Import React components from window.TravelCheckout
  • Move traveler information form from checkout-steps.js:
    • Copy existing form structure
    • Update to use new component structure
    • Maintain existing form validation
  • Implement split layout structure:
    • Container with CSS Grid: grid-template-columns: 1fr 1fr
    • Left column: Form section (50% width)
    • Right column: Tour details section (50% width)
    • Responsive breakpoints for mobile (stack vertically)
  • Create form section:
    • Form container with proper spacing
    • Input fields: Name, Email, Phone, Customer Reference
    • Form validation indicators
    • Continue button with validation state
  • Create tour details section:
    • Hero image display with fallback
    • Tour title with emoji
    • Description text with proper typography
    • Price and currency display
    • Duration information
    • Available dates list
    • Inclusions list with bullet points
    • Exclusions list with bullet points
  • Implement form validation:
    • Real-time validation on input change
    • Required field validation (name, email)
    • Email format validation using utils
    • Phone number format validation
    • Visual validation feedback (red/green borders)
    • Error message display
  • Add form state management:
    • Handle input changes
    • Maintain form data in parent state
    • Validate form before allowing continue
    • Reset form functionality
  • Implement tour data display:
    • Use tour data passed from landing page
    • Handle missing or incomplete data gracefully
    • Format price with currency symbol
    • Format dates in readable format
    • Handle empty inclusions/exclusions arrays
  • Add loading states:
    • Form loading skeleton
    • Tour details loading placeholder
    • Image loading states
  • Add responsive design:
    • Mobile: Stack form above tour details
    • Tablet: Maintain side-by-side layout
    • Desktop: Full side-by-side layout
    • Proper spacing and padding for all sizes
  • Export renderFormPage(tourData, formData, onInputChange, onContinue, onBack) function

✅ Task 2.3: Update Payment Page Component

File: /js/payment-page.js (rename from checkout-steps.js)

Subtasks:

  • Rename checkout-steps.js to payment-page.js
  • Remove landing and form page functions
  • Keep only payment/review functionality
  • Update function names for clarity
  • Export renderPaymentPage() function

✅ Task 2.4: Update Main App File

File: /js/checkout-app.js

Subtasks:

  • Add imports for all new modules:
    • import config from './config.js'
    • import * as utils from './utils.js'
    • import { renderLandingPage } from './landing-page.js'
    • import { renderFormPage } from './form-page.js'
    • import { renderPaymentPage } from './payment-page.js'
    • Keep existing payment handler imports
  • Replace hardcoded values with config:
    • Replace all URL constants with config values
    • Update API endpoints to use config
    • Replace default form values with config
  • Update state management:
    • Add showDemoModal state
    • Add tourData state for selected tour
    • Add loadingStates for different components
    • Maintain existing payment-related states
  • Implement demo modal logic:
    • Check for demo acknowledgment on app init
    • Show modal if first visit
    • Handle modal dismissal
    • Store acknowledgment using utils
  • Update step rendering logic:
    • Step 0: Show demo modal OR landing page
    • Step 1: Show form page with tour data
    • Step 2: Show payment page (existing)
    • Handle transitions between steps
  • Add tour selection handler:
    • Handle tour selection from landing page
    • Store selected tour data
    • Trigger API call to load full tour details
    • Navigate to form page
  • Update navigation handlers:
    • Handle back navigation between steps
    • Maintain tour data across navigation
    • Handle browser back button
  • Add error handling:
    • Global error boundary for component failures
    • API error handling and user feedback
    • Network failure recovery
  • Add loading state management:
    • Show loading indicators during API calls
    • Handle concurrent loading states
    • Prevent user interaction during loading
  • Update initialization logic:
    • Initialize demo modal check
    • Load cached tour data if available
    • Set up global error handlers
  • Maintain existing functionality:
    • Keep all payment-related logic intact
    • Preserve form data handling
    • Maintain script loading logic

PHASE 3: BACKEND INTEGRATION & API UPDATES

✅ Task 3.1: Update API Endpoints

File: /js/payment-handlers.js

Subtasks:

  • Import config and utils:
    • import config from './config.js'
    • import { buildApiUrl, getXSRFToken, handleApiError } from './utils.js'
  • Update nonce request function:
    • Change URL to use config.SERVER_BASE_URL + config.API_BASE_PATH + config.NONCE_ENDPOINT
    • Update request headers:
      • Add 'Content-Type': 'application/json'
      • Add 'X-XSRF-TOKEN': getXSRFToken() from cookies
      • Add 'Origin': window.location.origin
      • Add 'Referer': window.location.href
    • Update request body format: 
      {
  "tourId": "<selected_tour_id>",
  "cfToken": "<cloudflare_turnstile_token>"
}
    • Add proper error handling for CSRF failures
    • Handle 429 rate limiting responses
  • Update fingerprint exchange function:
    • Change URL to use config.SERVER_BASE_URL + config.API_BASE_PATH + config.EXCHANGE_ENDPOINT
    • Update headers:
      • Keep 'Content-Type': 'application/json'
      • Change to 'X-Payment-Nonce': <nonce> (remove Authorization header)
      • Add 'Origin': window.location.origin
      • Add 'Referer': window.location.href
    • Update request body format: 
      {
  "apiKey": "<public_api_key>",
  "mode": "<mode>",
  "paymentAmount": "<amount_in_cents>",
  "merchantUniquePaymentId": "<unique_booking_id>",
  "timestamp": "<ISO8601_timestamp>"
}
    • Remove backend API key requirement
    • Update error handling for nonce validation failures
  • Add cookie handling:
    • Ensure cookies are sent with credentials: 'include'
    • Handle missing XSRF token gracefully
    • Add cookie validation before API calls
  • Update error handling:
    • Handle network failures with retry logic
    • Parse error responses properly
    • Provide user-friendly error messages
    • Handle nonce expiration (60 seconds)
  • Add request timeout handling:
    • Set reasonable timeouts for API calls
    • Handle timeout errors gracefully
    • Provide timeout feedback to users
  • Update function signatures:
    • Include tourId parameter in nonce request
    • Remove unnecessary parameters
    • Update callback functions accordingly

✅ Task 3.2: Implement Tour Data Loading

File: /js/landing-page.js

Subtasks:

  • Create loadTourData(tourId) function:
    • Build full API URL: https://server.zenithpayments.support/api/v1/tour/${tourId}
    • Configure fetch request:
      • Method: 'GET'
      • Headers: { 'Accept': 'application/json' }
      • Credentials: 'include' (for cookies)
      • Mode: 'cors'
    • Handle response:
      • Check response.ok status
      • Parse JSON response
      • Extract tour data from response.body
      • Validate required fields exist
  • Add response data processing:
    • Parse JSON from response.body string
    • Map API response to internal tour object structure
    • Handle missing optional fields gracefully
    • Validate required fields (tourId, title, price, etc.)
  • Implement error handling:
    • Network failure handling (offline, timeout)
    • HTTP error status handling (404, 500, etc.)
    • Invalid JSON response handling
    • Missing required data handling
    • Provide fallback data for demo purposes
  • Add loading state management:
    • Track loading state per tour
    • Show loading indicators during fetch
    • Handle concurrent requests properly
    • Prevent duplicate requests for same tour
  • Implement caching strategy:
    • Cache successful API responses in memory
    • Use sessionStorage for tour data persistence
    • Check cache before making API calls
    • Implement cache expiration (30 minutes)
    • Clear cache on page refresh
  • Add tour data validation:
    • Validate tour object structure
    • Ensure required fields are present
    • Validate data types (price as number, etc.)
    • Sanitize text fields for XSS prevention
  • Handle cookies and security:
    • Ensure SESSION and XSRF-TOKEN cookies are set
    • Store cookies for subsequent API calls
    • Handle cookie expiration gracefully
  • Add retry logic:
    • Retry failed requests (max 3 attempts)
    • Exponential backoff for retries
    • Different retry strategies for different error types
  • Create tour loading orchestration:
    • Load all 3 tours concurrently
    • Handle partial failures (some tours load, others fail)
    • Provide feedback for each tour's loading state
    • Allow user interaction with successfully loaded tours

✅ Task 3.3: Update Security Token Handling

File: /js/payment-handlers.js

Subtasks:

  • Implement XSRF token extraction:
    • Read XSRF-TOKEN from cookies
    • Add to request headers
  • Add Cloudflare Turnstile integration:
    • Ensure turnstile token is captured
    • Include in nonce request
  • Update error handling:
    • Handle 429 rate limiting
    • Handle CSRF token errors
    • Handle nonce expiration (60 seconds)

PHASE 4: MODERN UI IMPLEMENTATION

✅ Task 4.1: Design Landing Page Cards

File: /js/landing-page.js + CSS

Subtasks:

  • Create modern card design:
    • Card container: border-radius: 12px, box-shadow: 0 4px 6px rgba(0,0,0,0.1)
    • Background: background: white, border: 1px solid #e5e7eb
    • Padding: padding: 1.5rem
    • Height: min-height: 400px for consistency
  • Style card images:
    • Image container: aspect-ratio: 16/9, border-radius: 8px
    • Image: object-fit: cover, width: 100%
    • Loading placeholder with skeleton animation
    • Error fallback with icon/text
  • Design typography:
    • Title: font-size: 1.5rem, font-weight: 600, color: #1f2937
    • Description: font-size: 0.875rem, color: #6b7280, line-height: 1.5
    • Price: font-size: 1.25rem, font-weight: 700, color: #059669
  • Create call-to-action button:
    • Button: background: #3b82f6, color: white, padding: 0.75rem 1.5rem
    • Border radius: border-radius: 6px
    • Hover state: background: #2563eb, transform: translateY(-1px)
    • Transition: transition: all 0.2s ease
  • Implement hover animations:
    • Card hover: transform: translateY(-4px) scale(1.02)
    • Shadow enhancement: box-shadow: 0 10px 25px rgba(0,0,0,0.15)
    • Transition: transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1)
  • Add sibling card effects:
    • Non-hovered cards: opacity: 0.6, transform: scale(0.98)
    • Smooth transition back to normal state
    • Use CSS :hover and :not(:hover) selectors
  • Implement responsive design:
    • Mobile (< 768px): Single column, full width cards
    • Tablet (768px - 1024px): Two column grid
    • Desktop (> 1024px): Three column grid
    • Use CSS Grid with grid-template-columns
  • Add loading states:
    • Skeleton card animation using CSS keyframes
    • Shimmer effect for loading images
    • Progressive content loading
  • Optimize for performance:
    • Use will-change: transform for animated elements
    • GPU acceleration with transform3d(0,0,0)
    • Debounce hover effects to prevent jank
  • Add accessibility features:
    • Focus states with outline and box-shadow
    • Keyboard navigation support
    • ARIA labels for screen readers
    • High contrast mode support

✅ Task 4.2: Style Form Page Layout

File: /js/form-page.js + CSS

Subtasks:

  • Create split-screen layout:
    • Container: display: grid, grid-template-columns: 1fr 1fr
    • Gap: gap: 2rem
    • Min height: min-height: calc(100vh - 4rem)
  • Style form section:
    • Form container: background: white, padding: 2rem, border-radius: 12px
    • Box shadow: box-shadow: 0 4px 6px rgba(0,0,0,0.05)
    • Form spacing: space-y: 1.5rem between elements
  • Design form inputs:
    • Input styling: border: 2px solid #e5e7eb, border-radius: 8px
    • Padding: padding: 0.75rem 1rem
    • Focus state: border-color: #3b82f6, outline: none, box-shadow: 0 0 0 3px rgba(59,130,246,0.1)
    • Error state: border-color: #ef4444, red focus ring
    • Success state: border-color: #10b981, green focus ring
  • Style form labels:
    • Label: font-weight: 500, color: #374151, margin-bottom: 0.5rem
    • Required indicator: red asterisk
    • Helper text: font-size: 0.875rem, color: #6b7280
  • Design validation feedback:
    • Error messages: color: #ef4444, font-size: 0.875rem
    • Success indicators: green checkmark icons
    • Real-time validation styling
  • Style continue button:
    • Primary button: background: #059669, color: white
    • Full width: width: 100%, padding: 1rem
    • Disabled state: opacity: 0.5, cursor: not-allowed
    • Loading state: spinner animation
  • Style tour details section:
    • Container: background: #f9fafb, padding: 2rem, border-radius: 12px
    • Sticky positioning: position: sticky, top: 2rem
  • Design tour image display:
    • Hero image: aspect-ratio: 16/9, border-radius: 8px
    • Image: object-fit: cover, width: 100%
    • Loading placeholder with blur effect
  • Style tour information:
    • Title: font-size: 1.75rem, font-weight: 700, color: #1f2937
    • Description: color: #4b5563, line-height: 1.6
    • Price: font-size: 1.5rem, font-weight: 700, color: #059669
  • Design lists (inclusions/exclusions):
    • List container: background: white, border-radius: 8px, padding: 1rem
    • List items: padding: 0.5rem 0, bullet points or checkmarks
    • Alternating background colors for readability
  • Add responsive design:
    • Mobile: Stack form above tour details
    • Tablet: Maintain side-by-side with adjusted proportions
    • Desktop: Full side-by-side layout
    • Proper touch targets for mobile (min 44px)
  • Implement loading states:
    • Form skeleton with animated placeholders
    • Tour details skeleton matching content structure
    • Progressive loading of images and content
  • Add micro-interactions:
    • Input focus animations
    • Button hover effects
    • Form submission feedback
    • Smooth transitions between states

✅ Task 4.3: Enhance Payment Page Styling

File: /js/payment-page.js + CSS

Subtasks:

  • Update existing payment page styling:
    • Maintain current functionality
    • Apply consistent design system
    • Match landing and form page aesthetics
  • Style review cards:
    • Consistent card styling with other pages
    • Clear information hierarchy
    • Proper spacing and typography
  • Enhance payment buttons:
    • Primary action styling for "Pay Now"
    • Secondary styling for "Back" button
    • Loading states and disabled states
  • Style error and success states:
    • Consistent alert styling
    • Clear visual hierarchy for different message types
    • Proper spacing and readability
  • Add responsive design:
    • Mobile-optimized payment flow
    • Touch-friendly button sizing
    • Readable text on small screens

PHASE 5: TESTING & OPTIMIZATION

✅ Task 5.1: Image Caching Implementation

File: /js/utils.js

Subtasks:

  • Implement robust image caching:
    • cacheImage(url, key) function:
      • Fetch image with proper error handling
      • Convert to base64 using FileReader or canvas
      • Compress images if too large (>500KB)
      • Store with timestamp for expiration
    • getCachedImage(key) function:
      • Retrieve from localStorage
      • Check expiration timestamp
      • Return base64 data URL or null
    • isCacheExpired(key, maxAge) function:
      • Compare stored timestamp with current time
      • Default expiration: 7 days
      • Handle corrupted timestamp data
  • Add cache management:
    • getCacheSize() - Calculate total cache size in bytes
    • clearExpiredCache() - Remove expired items
    • clearImageCache() - Remove all cached images
    • getCacheStats() - Return cache statistics
  • Implement cache size limits:
    • Maximum cache size: 50MB
    • LRU (Least Recently Used) eviction policy
    • Automatic cleanup when approaching limits
    • User notification when cache is full
  • Add cache optimization:
    • Image compression before caching
    • Progressive JPEG support
    • WebP format detection and support
    • Fallback to original URL if caching fails
  • Test caching performance:
    • Measure cache hit/miss ratios
    • Test cache persistence across browser sessions
    • Verify cache invalidation works correctly
    • Test cache behavior with network failures

✅ Task 5.2: Error Handling & Recovery

All Files

Subtasks:

  • Add comprehensive error boundaries:
    • Network failure handling:
      • Detect offline/online status
      • Queue requests when offline
      • Retry when connection restored
      • Show appropriate offline messages
    • API error responses:
      • Parse error messages from API responses
      • Handle different HTTP status codes appropriately
      • Provide user-friendly error messages
      • Log errors for debugging
    • Invalid data handling:
      • Validate API response structure
      • Handle missing required fields
      • Sanitize user inputs
      • Prevent XSS attacks
  • Implement retry mechanisms:
    • Automatic retry for transient failures:
      • Network timeouts
      • 5xx server errors
      • Rate limiting (429) with backoff
    • Manual retry options:
      • "Try Again" buttons for failed operations
      • "Refresh" options for stale data
      • Clear instructions for users
    • Exponential backoff:
      • Start with 1 second delay
      • Double delay for each retry
      • Maximum delay of 30 seconds
      • Maximum of 3 retry attempts
  • Add user feedback systems:
    • Loading indicators:
      • Skeleton screens for content loading
      • Spinner animations for actions
      • Progress bars for multi-step processes
    • Error messages:
      • Clear, actionable error descriptions
      • Suggestions for resolution
      • Contact information for support
    • Success confirmations:
      • Visual feedback for completed actions
      • Clear next steps for users
      • Celebration animations for major milestones
  • Implement graceful degradation:
    • Fallback content when APIs fail
    • Offline mode with cached data
    • Progressive enhancement approach
    • Accessibility in error states

✅ Task 5.3: Final Integration Testing

All Files

Subtasks:

  • Test complete user flow:
    • Demo modal functionality:
      • Shows on first visit
      • Doesn't show on subsequent visits
      • Properly stores acknowledgment
      • Handles corrupted storage data
    • Landing page functionality:
      • All 3 tours load correctly
      • Hover effects work smoothly
      • Images cache and load from cache
      • Tour selection navigates correctly
    • Form page functionality:
      • Form validation works correctly
      • Tour details display properly
      • Navigation between steps works
      • Data persists across navigation
    • Payment flow functionality:
      • All API calls work with new endpoints
      • CSRF tokens are handled correctly
      • Nonce exchange works properly
      • ZenPay integration still functions
  • Test caching functionality:
    • Images cache on first load
    • Cached images load on subsequent visits
    • Cache expiration works correctly
    • Cache cleanup functions properly
    • Demo acknowledgment persists correctly
  • Performance testing:
    • Page load times under 3 seconds
    • Smooth animations (60fps)
    • Memory usage stays reasonable
    • No memory leaks during navigation
    • Image loading doesn't block UI
  • Cross-browser testing:
    • Chrome (latest 2 versions)
    • Firefox (latest 2 versions)
    • Safari (latest 2 versions)
    • Edge (latest 2 versions)
    • Mobile browsers (iOS Safari, Chrome Mobile)
  • Responsive design testing:
    • Mobile phones (320px - 768px)
    • Tablets (768px - 1024px)
    • Desktop (1024px+)
    • Ultra-wide screens (1440px+)
  • Accessibility testing:
    • Keyboard navigation works throughout
    • Screen reader compatibility
    • Color contrast meets WCAG standards
    • Focus indicators are visible
  • Security testing:
    • XSS prevention in user inputs
    • CSRF tokens work correctly
    • No sensitive data in localStorage
    • Proper cookie handling
  • Error scenario testing:
    • Network failures at each step
    • Invalid API responses
    • Corrupted cache data
    • Browser storage limitations

IMPLEMENTATION ORDER

  1. Phase 1: Infrastructure (Config, Utils, Demo Modal) - ~15 tasks
  2. Phase 2: File Reorganization (Split components) - ~25 tasks
  3. Phase 3: API Integration (Update endpoints, security) - ~20 tasks
  4. Phase 4: UI Implementation (Modern design, animations) - ~30 tasks
  5. Phase 5: Testing & Optimization (Caching, error handling) - ~35 tasks

Total: ~125 actionable tasks

SUCCESS CRITERIA

  • Demo modal shows once per user, stored encoded in localStorage
  • 3-card landing page with smooth hover effects and real images
  • Real tour data loaded from https://server.zenithpayments.support/api/v1/tour/{id}
  • Proper security flow with CSRF tokens and nonce handling
  • Images cached in localStorage with expiration and size management
  • No breaking changes to existing payment flow
  • Modern, professional UI/UX with consistent design system
  • Responsive design works on mobile, tablet, and desktop
  • Comprehensive error handling provides good user experience
  • All API calls use correct endpoints with proper headers
  • Form validation works with real-time feedback
  • Performance optimized with caching and lazy loading
  • Cross-browser compatibility verified
  • Accessibility standards met (WCAG compliance)

FRONTEND-SPECIFIC NOTES

✅ What Frontend Handles:

  • All UI components and user interactions
  • API calls to backend endpoints
  • Client-side caching and storage
  • Form validation and user feedback
  • Image loading and caching
  • Browser compatibility and responsive design
  • Error handling and retry logic
  • Demo modal and user onboarding

❌ What Backend Handles (NOT in this plan):

  • API endpoint implementation
  • Database operations
  • Server-side validation
  • Payment processing callbacks
  • Security token generation
  • CORS configuration
  • Cookie management (server-side)

Ready to start implementation once this task list is approved!