---
title: "Concepts"
description: "The four ideas every Cardzone integration needs, API keys, the catalog, the order lifecycle, and the store wallet."
---

> Documentation Index
> Fetch the complete documentation index at: https://docs.cardzone.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Concepts

Read these pages once before you write integration code. Each page is short, and each one links to the guide that uses it.

- [Authentication and API keys](https://docs.cardzone.ai/concepts/authentication/) — Live and sandbox API keys, permissions, and the 401 and 403 errors.
- [Catalog and recipients](https://docs.cardzone.ai/concepts/catalog-and-recipients/) — Each product is one item at one amount. recipient\_fields tell you which account fields to ask for.
- [Order lifecycle](https://docs.cardzone.ai/concepts/order-lifecycle/) — Five public statuses, three of them final, and what to do for each one.
- [Store wallet](https://docs.cardzone.ai/concepts/wallet/) — How the store wallet pays for orders, the minimum balance for live API keys, and orders blocked by the store wallet.

Source: https://docs.cardzone.ai/concepts/index.mdx