clerk-knowledge-patch

# Clerk Knowledge Patch Use this guide when implementing, upgrading, or debugging Clerk authentication, authorization, Organizations, Billing, SDKs, components, or deployment architecture. Start with the migration notes below, then open the topic reference that matches the work. ## Reference index | Reference | Topics | | --- | --- | | [Architecture and deployment](references/architecture-and-deployment.md) | Account Portal, FAPI, cookies, handshake, environments, routing, Astro, Next.js, Dashboard roles, Platform API | | [Authentication and sessions](references/authentication-and-sessions.md) | Factors, SSO, OAuth/OIDC, passkeys, pending sessions, reverification, JWT claims, restrictions | | [Billing](references/billing.md) | Plans, Features, Subscriptions, trials, checkout, hooks, administration | | [Components](references/components.md) | Sign-in-or-up, Waitlist, Google One Tap, Show, loading controls, redirects, Billing drawers | | [Core 3 migration](references/core-3-migration.md) | Signal API, Expo native UI and hooks, attempt errors, MFA, transfer handling | | [Customization](references/customization.md) | Appearance, themes, Tailwind, iOS theming, localization, templates, Elements, profile extensions | | [Frontend resources](references/frontend-resources.md) | Browser API keys, Web3, email links, token cache, user refresh, listeners, multi-session behavior | | [Go Backend SDK](references/go-backend-sdk.md) | v2 setup, clients, middleware, resources, JWTs, roles, ma...