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title: Introduction
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---
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< p > This is the documentation for the version 5 release candidate.< / p >
< p > Version 5 is stable and is the recommended version that you should implement as it is significantly simpler to work with.< / p >
< p > Version 4 docs can be < a href = "/V4-docs/" > found here< / a > .< / p >
< / div >
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# Introduction
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[](https://twitter.com/alexbilbie)
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[](https://github.com/thephpleague/oauth2-server)
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[](LICENSE.md)
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[](https://travis-ci.org/thephpleague/oauth2-server)
[](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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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 [](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 [Glynde Labs ](https://glyndelabs.com ).
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