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Phase 4 - Billing/Stripe: - src/Billing/StripeService.php: Stripe API wrapper - Checkout session creation - Customer management - Billing portal sessions - Webhook signature verification - src/Billing/SubscriptionManager.php: Subscription logic - Plan management (CRUD) - Trial handling - Feature access checks - Invoice storage - src/Billing/WebhookHandler.php: Stripe webhook processing - checkout.session.completed - customer.subscription.* events - invoice.paid / payment_failed - api/stripe-webhook.php: Webhook endpoint - dashboard/billing.php: Billing dashboard - Current plan display with features - Plan comparison grid - Upgrade buttons with Stripe Checkout - Invoice history Phase 5 - Landing Page: - landing/index.php: Marketing homepage - Hero section with CTA - Feature grid (6 features) - How it works (3 steps) - Final CTA section - Responsive design - landing/pricing.php: Pricing page - Dynamic plan cards from DB - Monthly/yearly toggle (2 months free) - Feature comparison - FAQ accordion All features respect saas_features toggles in settings.