New answers tagged openid
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OpenID Wiki has a page of Libraries many of which have decent documentation, that all help with implementing OpenID Identity Server on your own site.
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The OpenID Foundation has lots of information.
Many common CMS platforms, like WordPress and Magento, have their own plugins already built.
If you just want to use Google, you visit their Federated Login for Google Account Users page. For just Facebook, visit Facebook Login for Developers.
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