Clerk

# Clerk ## Docs - [Maintenance Mode](https://clerk.com/docs/maintenance-mode.md): Learn about Clerk's Maintenance Mode. - [Clerk CLI](https://clerk.com/docs/cli.md): Learn how to use the Clerk CLI to set up authentication, manage configuration, and integrate with AI agents. - [Pin a Clerk SDK](https://clerk.com/docs/pinning.md): Learn how to pin a Clerk SDK to a specific version. - [Welcome to Clerk Docs](https://clerk.com/docs.md): Add complete user management to your application in minutes. - [Core concepts](https://clerk.com/docs/getting-started/core-concepts.md): Learn about the main concepts and objects that drive Clerk's powerful authentication and user management system. - [Quickstarts](https://clerk.com/docs/getting-started/quickstart/overview.md): See the getting started guides and tutorials. - [Set up your Clerk account](https://clerk.com/docs/getting-started/quickstart/setup-clerk.md): Set up a new Clerk account and integrate it into a new application. - [Next.js Quickstart (Pages Router)](https://clerk.com/docs/getting-started/quickstart/pages-router.md): Add authentication and user management to your Next.js app with Clerk. - [Chrome Extension Quickstart (JavaScript)](https://clerk.com/docs/getting-started/quickstart/chrome-extension-js.md): Add authentication and user management to your Chrome Extension with Clerk using plain TypeScript and esbuild. - [SDK References](https://clerk.com/docs/reference/overview.md): Learn about the Clerk and community SDK's available for integrating Clerk into your application. - [API Reference](https://clerk.com/docs/reference/api/overview.md): Access Clerk's frontend and backend API reference documentation. - [Component Versioning](https://clerk.com/docs/reference/components/versioning.md): Learn how Clerk versions its components, and how to specify a specific version if necessary. - [Component Changelog](https://clerk.com/docs/reference/components/changelog.md): Keep track of the changes to Clerk's components. - [`authenticateRequest()`](https://clerk.com/docs/reference/backend/authenticate-request.md): Use the authenticateRequest() method to verify a token passed from the frontend. - [`clerkClient`](https://clerk.com/docs/reference/backend/overview.md): Use clerkClient to interact with Clerk's Backend API resources. - [`verifyToken()`](https://clerk.com/docs/reference/backend/verify-token.md): Use the verifyToken() method to verify a token signature. - [`verifyWebhook()`](https://clerk.com/docs/reference/backend/verify-webhook.md): Use the verifyWebhook() method to verify a webhook signature. - [`cancelSubscriptionItem()`](https://clerk.com/docs/reference/backend/billing/cancel-subscription-item.md): Use the cancelSubscriptionItem() method to cancel a Subscription Item. - [`extendSubscriptionItemFreeTrial()`](https://clerk.com/docs/reference/backend/billing/extend-subscription-item-free-trial.md): Use the extendSubscriptionItemFreeTrial() method to extend the free trial period of a Subscription Item. - [`getOrganizationBillingSubscription()`](https://clerk.com/docs/reference/backend/billing/get-organization-billing-subscription.md): Use the getOrganizationBillingSubscription() method to get an Organization's Billing Subscription. - [`getPlanList()`](https://clerk.com/docs/reference/backend/billing/get-plan-list.md): Use the getPlanList() method to get a list of Billing Plans. - [`getUserBillingSubscription()`](https://clerk.com/docs/reference/backend/billing/get-user-billing-subscription.md): Use the getUserBillingSubscription() method to get a user's Billing Subscription. - [`create()`](https://clerk.com/docs/reference/backend/api-keys/create.md): Use the create() method to create an API key. - [`delete()`](https://clerk.com/docs/reference/backend/api-keys/delete.md): Use the delete() method to delete an API key. - [`getSecret()`](https://clerk.com/docs/reference/backend/api-keys/get-secret.md): Use the getSecret() method to get the secret of an API key. - [`get()`](https:// […gekürzt]