Introduction | Documentation

# Documentation ## v2 - [Introduction](https://docs.autentique.com.br/api/master.md): Integration guide with autentique.com.br API using GraphQL. It is not available in REST, if it ever exists we will remove this sentence. - [About GraphQL](https://docs.autentique.com.br/api/sobre-o-graphql.md): GraphQL is a query language for APIs and a runtime for executing those queries with existing data. Unlike REST, it lets you structure your request however you prefer. - [API pricing](https://docs.autentique.com.br/api/api-pricing.md): This page provides detailed information about Autentique’s API pricing structure. It includes tables with the costs for different actions, along with usage and billing examples. - [Using Altair](https://docs.autentique.com.br/api/integration-basics/altair.md): Altair is an application for running GraphQL queries/mutations. With it, you can build and check the results of requests on the web before integrating them into your code. - [Sandbox/tests](https://docs.autentique.com.br/api/integration-basics/sandbox-testes.md): A great way to run tests on the platform without extra costs or using up your free documents. - [Webhooks](https://docs.autentique.com.br/api/integration-basics/webhooks.md): Receive events from your organization on Autentique through your webhook endpoints. - [Webhooks (deprecated)](https://docs.autentique.com.br/api/integration-basics/webhooks-1.md): How to set up Webhooks and receive document status notifications - [Error messages](https://docs.autentique.com.br/api/integration-basics/mensagens-de-erro.md): Examples of error messages or validations returned by the API and what they are - [OAuth 2.0](https://docs.autentique.com.br/api/integration-basics/oauth2.md): Let users authorize your integration to access the Autentique API on their behalf. - [Creating an OAuth application](https://docs.autentique.com.br/api/integration-basics/oauth2/creating-an-oauth-application.md): Create and configure an OAuth application in the A