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---
layout: default
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title: Introduction
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---
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# Introduction
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[![Author ](http://img.shields.io/badge/author-@alexbilbie-red.svg?style=flat-square )](https://twitter.com/alexbilbie)
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[![Source Code ](http://img.shields.io/badge/source-thephpleague%2Foauth2--server-blue.svg?style=flat-square )](https://github.com/thephpleague/oauth2-server)
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[![GitHub tag ](https://img.shields.io/github/tag/thephpleague/oauth2-server.svg )](https://github.com/thephpleague/oauth2-server/releases)
[![Software License ](https://img.shields.io/badge/license-MIT-brightgreen.svg?style=flat-square )](LICENSE.md)
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[![Build Status ](https://img.shields.io/travis/thephpleague/oauth2-server/master.svg?style=flat-square )](https://travis-ci.org/thephpleague/oauth2-server)
[![Total Downloads ](https://img.shields.io/packagist/dt/league/oauth2-server.svg?style=flat-square )](https://packagist.org/packages/league/oauth2-server)
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`league/oauth2-server` is a library that makes implementing a standards compliant OAuth 2.0 server trivial. Your users can authenticate and authorize application clients, and protect your APIs.
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Out of the box it supports all of the grants defined in the [OAuth 2.0 Authorization Framework RFC ](https://tools.ietf.org/html/rfc6749 ):
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* Authorization code grant
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* Implicit grant
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* Client credentials grant
* Resource owner password credentials grant
* Refresh grant
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You can also easily make your own [custom grants]().
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Both JWT bearer token and MAC token response types are supported too.
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This library was created by Alex Bilbie. Find him on Twitter at [@alexbilbie ](https://twitter.com/alexbilbie ).
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## Changelog
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The full changelog can be viewed here - [https://github.com/thephpleague/oauth2-server/releases ](https://github.com/thephpleague/oauth2-server/releases ).
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The latest release is [![GitHub tag ](https://img.shields.io/github/tag/thephpleague/oauth2-server.svg )](https://github.com/thephpleague/oauth2-server/releases)
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## Support
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Please ask questions on the [Github issues page ](https://github.com/thephpleague/oauth2-server/issues ).
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For commercial support and custom implementations please visit [Protobytes ](https://protobytes.uk/oauth ).