# BILLZ for developers

> BILLZ 2.0 public API — integration of catalog, sales, warehouse and reports.

BILLZ 2.0 REST API for integrations. Connect eCommerce, bots, BI and marketplaces in 10 minutes!

- [Start in 10 minutes](/en/start/)
- [API reference](/en/reference/api/)
- [Prompt for an AI agent](/en/agent-setup/)

import { Card, CardGrid, LinkCard } from '@astrojs/starlight/components';
import AgentPromptCopy from '../../../components/AgentPromptCopy.astro';

<AgentPromptCopy />

## Where to start

<CardGrid>
  <Card title="Getting started" icon="rocket">
    Integration key, first request, first sale — an end-to-end path from zero to a working call.
    [Go](/en/start/)
  </Card>
  <Card title="Recipes" icon="setting">
    Ready-made scenarios: catalog synchronization, stock, sales, error handling.
    [Open](/en/guides/sync-catalog/)
  </Card>
  <Card title="Reference" icon="list-format">
    Public methods and models. Full OpenAPI 3.0.3 compatibility.
    [View](/en/reference/api/)
  </Card>
  <Card title="Concepts" icon="information">
    How product, sale and warehouse are structured and why some methods are asynchronous.
    [Learn more](/en/concepts/data-model/)
  </Card>
</CardGrid>

<LinkCard
  title="Postman and Insomnia collections"
  description="A ready-made collection of all public methods with authorization and environment variables."
  href="/en/tools/collections/"
/>