public Program(string username, string password)
{
// logger factory / adjust to your needs to log to the desired destination
var loggerFactory = new LoggerFactory();
loggerFactory.AddConsole();
logger = loggerFactory.CreateLogger <Program>();
// create HTTP client with correct authentication and basic logging
logger.LogInformation("Creating http client");
var httpClient = CreateHttpClient(loggerFactory, username, password);
// create instance of FOMA SDK
logger.LogInformation("Creating foma SDK");
fomaSdk = new FomaClient(httpClient, loggerFactory.CreateLogger <FomaClient>());
}