> ## Documentation Index
> Fetch the complete documentation index at: https://docs.qonto.com/llms.txt
> Use this file to discover all available pages before exploring further.
# Introduction
Qonto provides **2 collections of REST APIs** and a **Sandbox environment** to help you build integrations on top of Qonto accounts, transactions, memberships, etc; no matter what your use case is.
JSON is returned in all API responses, including errors.
For security purposes:
* All API requests must be made over HTTPS. Calls made over plain HTTP will fail.
* All API requests (except the ones to [/v2/oauth2/auth](/api-reference/business-api/authentication/oauth2/retrieve_authorization)) must be made **from your backend**. Direct calls from browsers will fail.
## Qonto APIs
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href="/get-started/business-api/overview"
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Access Qonto banking, invoicing, bookkeeping & more remotely
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href="/get-started/onboarding-api/overview"
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Fast track your customers' onboarding to Qonto
## Use cases
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**Qonto account owners** automating their own workflows (accounting sync, internal reporting, reconciliation) using the **Business API**.
Access with:
* [OAuth 2.0](/get-started/business-api/authentication/oauth/oauth-flow) if you need to perform sensitive actions (cf. the [endpoints access table](/get-started/business-api/authentication/introduction#endpoints-access) to identify if you need to use an endpoint which is only accessible through OAuth) OR if you want to restrict the scopes accessible with your authentication credentials to a specific list of scopes;
* Your [API key](/get-started/business-api/authentication/api-key) otherwise.
The API key authentication method is much more simple to implement than OAuth 2.0.
This use case requires **no validation from Qonto**, for either authentication method. You can start building right away.
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**Third-party platforms** connecting to Qonto on behalf of their users (ERPs, accounting software, financial tools).
Access with: [OAuth 2.0](/get-started/business-api/authentication/oauth/oauth-flow).
This use case **requires validation from Qonto** if you are requesting [sensitive scopes](/get-started/business-api/authentication/oauth/available-scopes#available-scopes).
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>
**Partners embedding Qonto** natively into their product.
* To create Qonto business accounts (and eventually companies) for your customers, use the **Onboarding API**;
* To operate those accounts directly from your platform, use the **Business API** (with [OAuth 2.0](/get-started/business-api/authentication/oauth/oauth-flow)).
Requires **signing a partnership contract** with Qonto before going live.
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**Platforms** using the **Onboarding API** to create Qonto accounts and companies (digital KYB, KYC and capital deposit) programmatically.
Requires **signing an ORIAS mandate** (France only) and a **partnership contract** with Qonto before going live.