As of the Winter 2015 release, VersionOne supports its own type of Access Token Authentication. VersionOne Access Tokens are far easier to create and use than the other authentication mechanisms, and is the recommend approach as it can be used no matter if your VersionOne instance is configured for Basic, Windows Integrated Authentication, or a third-party SSO authentication method like SAML.
There are several well-known OAuth2 client implementations that you can (and should) use to build your application.
.Net / C#
- DotNetOpenAuth (VersionOne's OAuth2 server implementation employs DotNetOpenAuth)
- oauth2 gem