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  - href: en/custom/backend/index.md
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> **Documentation Index:** Fetch the complete configuration index at https://pay.yandex.ru/docs/en/llms.txt

# Overview

The interaction between the merchant's backend and Yandex Pay is built around two APIs:

- [Merchant API](https://pay.yandex.ru/docs/en/custom/backend/merchant-api/index.md): Sending queries from the Yandex Pay backend to the merchant's backend to retrieve data about the cart and order or to create a new order.
- [Yandex Pay API](https://pay.yandex.ru/docs/en/custom/backend/yandex-pay-api/index.md): Sending requests from the merchant's backend to the Yandex Pay backend to manage the order.