Using reasonable defaults and optional parameters

CustomerAPI.cs

public void LoginAsCustomer(LoginInfo loginInfo, CustomerType customerType = CustomerType.NEW_CUSTOMER, int numberOfTries = 3)
{
  // ...
}
 
var loginInfo = new LoginInfo("Darth Vader", "ihatewookes");
LoginAsCustomer(loginInfo);

// What if we need to override a default? No problem.

LoginAsCustomer(loginInfo, customerType: CustomerType.REWARDS_CUSTOMER);