> ## 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.

# Guides

> Technical guides and business use cases to build on the Qonto APIs: Developer Portal, authentication, PSD2, webhooks, payments, invoicing and partner mechanisms.

## Developer Portal

> **[Create my OAuth App](https://docs.qonto.com/guides/developer-portal/create-oauth-app.md)**
>
> Sign up to the Developer Portal, create your OAuth 2.0 client and manage its credentials.

> **[Developer guidelines](https://docs.qonto.com/guides/developer-portal/developer-guidelines.md)**
>
> Step-by-step guide to build, test, release and publish your integration.

> **[Sandbox access](https://docs.qonto.com/guides/developer-portal/sandbox-access.md)**
>
> Bypass the OneLogin gate from your code and from a browser.

## Authentication

> **[Basics of the OAuth 2.0 flow](https://docs.qonto.com/guides/authentication/oauth-flow.md)**
>
> Authorize, exchange the code, refresh tokens.

> **[Authenticate with OAuth 2.0 (User OAuth flow)](https://docs.qonto.com/guides/authentication/user-oauth-flow.md)**
>
> Access multiple Qonto organizations belonging to the same user.

> **[OAuth in the Sandbox](https://docs.qonto.com/guides/authentication/oauth-sandbox.md)**
>
> Important differences when using the OAuth flow in the Sandbox.

> **[API key](https://docs.qonto.com/guides/authentication/api-key.md)**
>
> Authenticate with your own API key to automate your Qonto account.

> **[QSealC](https://docs.qonto.com/guides/authentication/qsealc.md)**
>
> TPP identification through PSD2 QSeal certificate.

> **[Strong Customer Authentication](https://docs.qonto.com/guides/authentication/sca-flows.md)**
>
> SCA flows for sensitive actions, and how to test them.

## PSD2

> **[How to make a transfer with PSD2](https://docs.qonto.com/guides/psd2/make-a-transfer.md)**
>
> Sensitive scopes, Verification of Payee, SCA and trusted beneficiaries.

## Webhooks

> **[Overview](https://docs.qonto.com/guides/webhooks/overview.md)**
>
> Get notified in real time when events occur on an account.

> **[Setup](https://docs.qonto.com/guides/webhooks/setup.md)**
>
> Register your callback URL, verify the signature, and handle retries.

> **[Testing](https://docs.qonto.com/guides/webhooks/testing.md)**
>
> Test your subscription with webhook.site.

> **[Troubleshooting](https://docs.qonto.com/guides/webhooks/troubleshooting.md)**
>
> Diagnose delivery, signature and retry issues.

> **[Supported events](https://docs.qonto.com/guides/webhooks/supported-events.md)**
>
> The catalogue of webhook events and their payloads.

## Payments concepts

> **[Verification of Payee](https://docs.qonto.com/guides/payments/verification-of-payee.md)**
>
> Verify beneficiary details before initiating SEPA transfers.

> **[International transfers](https://docs.qonto.com/guides/payments/international-transfers.md)**
>
> Eligibility, currencies, quotes, beneficiaries and transfers outside the Eurozone.

> **[SEPA Direct Debit](https://docs.qonto.com/guides/payments/sepa-direct-debit.md)**
>
> Collect payments with SEPA Direct Debit from your customers.

> **[Payment links](https://docs.qonto.com/guides/payments/payment-links.md)**
>
> Accept payments with secure, customizable payment links.

> **[Terminals](https://docs.qonto.com/guides/payments/terminals.md)**
>
> Push payments from your POS to physical payment terminals.

## Invoicing

> **[E-invoicing via API](https://docs.qonto.com/guides/invoicing/e-invoicing.md)**
>
> Send and receive electronic invoices through Qonto's API.

> **[Factur-X invoices](https://docs.qonto.com/guides/invoicing/factur-x.md)**
>
> Generate and download Factur-X invoices.

> **[Payment reminders](https://docs.qonto.com/guides/invoicing/reminders.md)**
>
> What to know before automating payment reminders.

## Partner mechanisms

> **[Encoded requests](https://docs.qonto.com/guides/partner-mechanisms/encoded-requests.md)**
>
> Proxy API requests sent by the Embed SDK.

> **[Embed auth links](https://docs.qonto.com/guides/partner-mechanisms/embed-auth-links.md)**
>
> Authenticate your end customers to Hosted Pages.

## Migrations and troubleshooting

> **[Migrate to GET /v2/organization](https://docs.qonto.com/guides/migrations/deprecated-organization-endpoints.md)**
>
> Move off the deprecated organization endpoints before their sunset on November 15, 2026.

> **[Troubleshooting](https://docs.qonto.com/guides/troubleshooting.md)**
>
> Diagnose and resolve common authentication and connection issues.

## Use cases

> **[Business use cases](https://docs.qonto.com/guides/use-cases/index.md)**
>
> Step-by-step guides with full code examples: SEPA transfers, transaction and invoice sync, Factur-X, SDD collections…