public async Task <IAuthenticatedUser> ValidateAuthAsync(string authorizationId, string oauthVerifier) { var twitterAuth = await FindAndDeleteAsync(authorizationId); if (string.IsNullOrEmpty(oauthVerifier)) { return(null); } return(_twitterClient.GetAuthenticatedUser(oauthVerifier, twitterAuth.AuthorizationKey, twitterAuth.AuthorizationSecret)); }