DevDefined - call Current User API

OAuthConsumerContext consumerContext = new OAuthConsumerContext
{
    ConsumerKey = consumerKey,
    ConsumerSecret = consumerSecret,
    SignatureMethod = SignatureMethod.HmacSha1,
    UseHeaderForOAuthParameters = true
};

OAuthSession oSession = new OAuthSession(consumerContext, "http://www.example.com", "http://www.example.com", "http://www.example.com")
                            {
                                AccessToken = new TokenBase
                                                    {
                                                        Token = accessToken,
                                                        ConsumerKey = consumerSecret,
                                                        TokenSecret = accessTokenSecret
                                                    }
                            };

IConsumerRequest consumerRequest = oSession.Request();
consumerRequest = consumerRequest.Get();
consumerRequest = consumerRequest.ForUrl("https://appcenter.intuit.com/api/v1/user/current");
consumerRequest = consumerRequest.SignWithToken();

string serviceResponse = consumerRequest.ReadBody();