Update: Billing UI + Customer Portal live

Yesterday I promised the Billing UI and Paywall Interceptor. Today the Billing UI is done and I went further - integrated the full Stripe Customer Portal.

What's shipped:

-Real-time billing dashboard (credits balance, transaction history, usage breakdown)

-Smart plan management button ("Manage Subscription" opens Stripe Portal for upgrades/downgrades/cancellations)

-Flexible credit purchases (custom quantity input, min 10 credits, real-time price calculation)

-Secure checkout flow from landing page (authenticated users → direct Stripe checkout, unauthenticated → /login?plan=xxx → auto-redirect after login)

-Stripe Customer Portal configured (proration, plan switching, invoice downloads all working)

Key decisions:

Customer Portal over custom UI: Stripe's native portal handles upgrades/downgrades/cancellations with proration. No need to reinvent the wheel.

Auth-aware navigation: Landing page buttons change based on login state (Login/Dashboard, Get Started/Logout)

What's left:

Paywall Interceptor (global 402 handler) - moved to tomorrow

10 days to launch.