# Polar

> Payments & Billing with 6 lines of code. Open Source & Global Merchant of Record.

## Features

### General
- [Polar: Turn Your Software into a Business](/content/docs/introduction.md): The next generation unicorns will be built by smaller teams. Polar makes that dream possible.
- [Products](/content/docs/features/products.md): Start selling digital products on Polar in minutes.
- [Embedded Checkout](/content/docs/features/checkout/embed.md): Embed our checkout directly on your site.
- [Managing subscriptions](/content/docs/features/subscriptions/manage.md): Everything you can do to a subscription after it's been created.

### Billing
- [Billing](/content/docs/features/usage-based-billing/billing.md): How billing works with Usage Based Billing.
- [Credits](/content/docs/features/usage-based-billing/credits.md): Crediting customers for Usage Based Billing.
- [Introduction to Cost Insights](/content/docs/features/cost-insights/introduction.md): Track costs, profits, and customer lifetime value with event-based cost tracking.

### Integrations
- [Integrate Polar with Encore](/content/docs/guides/encore.md): In this guide, we'll show you how to integrate Polar with Encore.
- [Polar Integration in Fernand](/content/docs/features/integrations/fernand.md): Learn how to sync customer and payment data from Polar to Fernand.

### API Reference
- [API Overview](/content/docs/api-reference/2026-04/introduction.md): Official SDK quickstarts, base URLs, authentication, pagination, rate limits, and API concepts.
- [Create Checkout Session](/content/docs/api-reference/2026-04/checkouts/create-checkout-session.md): Create a checkout session.
- [Get Customer](/content/docs/api-reference/2026-04/customers/get-customer.md): Get a customer by ID.

### License Keys and Seats
- [Get License Key](/content/docs/api-reference/2026-10/license_keys/get-license-key.md): Get a license key.
- [List Seats](/content/docs/api-reference/2026-10/customer-seats/list-seats.md): **Scopes**: `customer_seats:read`.
- [Assign Seat](/content/docs/api-reference/2026-10/customer-seats/assign-seat.md): **Scopes**: `customer_seats:write`.

### Webhooks
- [Create Webhook Endpoint](/content/docs/api-reference/2026-10/webhooks/create-webhook-endpoint.md): Create a webhook endpoint.
- [List Webhook Endpoints](/content/docs/api-reference/2026-10/webhooks/list-webhook-endpoints.md): List webhook endpoints.

### Changelog
- [Product Updates](/content/docs/changelog/recent.md): Stay up to date with the latest changes and improvements to Polar.
- [API Changelog](/content/docs/changelog/api.md): Stay up to date with the latest changes introduced in our API.

## OpenAPI Specs
- [2026-04.openapi](/docs/openapi/2026-04.openapi.json)
- [2026-10.openapi](/docs/openapi/2026-10.openapi.json)