private IAuthorizationState Authenticate(NativeApplicationClient client)
{
IAuthorizationState state = new AuthorizationState(new string[] { })
{
RefreshToken = this.refreshToken
};
// IMPORTANT - does not work without:
client.ClientCredentialApplicator = ClientCredentialApplicator.PostParameter(this.clientSecret);
client.RefreshAuthorization(state);
return(state);
}