> For the complete documentation index, see [llms.txt](https://docs.topay.mobi/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.topay.mobi/introduction.md).

# Introduction

Integrate crypto acquiring, crypto withdrawals, fiat payins, and fiat payouts with Topay.

Topay provides REST APIs for two groups of payment services:

* **Crypto Payments** — receive crypto payments through deposit addresses or checkout, and withdraw crypto to a destination address.
* **Fiat Payments** — collect payments through local payment channels and send payouts to bank accounts or wallets.

Use APIs to create transactions and query orders, balances, and exchange rates. Webhooks notify your backend of order status updates.

## Documentation

* [Getting Started](/getting-started.md) covers initial setup and choosing your payment flow.
* Integration explains authentication and the steps for each business flow.
* [API Reference](/reference/api-reference.md) contains endpoints, parameters, and examples.
* [Webhook](/integration/webhook.md) describes notifications and verification.