# Licensr

> Licensr sells software licenses: a hosted buy page or checkout from the seller's own site, license keys emailed to buyers, and a small REST API that products call to activate and validate those keys.

Coding agents: start with the integration page below. It is self-contained and lists the values to ask the seller for (API base URL, product slug, store slug, Client API key). Never put a full-access API key in code that ships to customers.

## Start here

- [Integrate Licensr (for coding agents)](https://docs.licensr.app/agents/storefront-integration): selling (hosted buy page or own-site checkout) and license checks in one page

## Reference

- [License calls: activate, validate, deactivate](https://docs.licensr.app/plugin-integration): every field, error, and rule
- [In-app and own-site checkout](https://docs.licensr.app/advanced/in-app-checkout): POST /v1/billing/checkout from the seller's server
- [Webhooks](https://docs.licensr.app/advanced/webhooks): signed license and subscription events sent to the seller's server
- [Offline tokens](https://docs.licensr.app/advanced/offline-tokens): signed tokens verified without a network call
- [Security and limits](https://docs.licensr.app/advanced/security-and-limits): allowed websites, rate limits
- [Seller API](https://docs.licensr.app/api/seller-api): list, issue, revoke and re-key licenses, free a device or website, and erase a buyer from the seller's server (full-access key)
- [OpenAPI spec](https://docs.licensr.app/openapi.json): the public license, checkout, storefront and seller API

## Optional

- [Guides by product type](https://docs.licensr.app/guides): WordPress, browser extensions, audio plugins, desktop apps, games and more
- [SDKs](https://docs.licensr.app/sdks): JavaScript, C++, C# / Unity, Go