public void Authenticate()
{
PromptCredentials();
OAuthToken = HttpPost <Token>(Settings.Default.LogonEndpoint, Login);
if (OAuthToken.MfaRequired)
{
Console.Write("MFA Code: ");
string mfaCode = Console.ReadLine();
Login.MfaCode = mfaCode;
OAuthToken = HttpPost <Token>(Settings.Default.LogonEndpoint, Login);
}
OAuthToken.SaveToFile();
Client.DefaultRequestHeaders.Authorization = new System.Net.Http.Headers.AuthenticationHeaderValue(OAuthToken.TokenType, OAuthToken.AccessToken);
}