add idm/access code preference for physical cards (server)

AMNet.Server/Config.cs

@@ -1,4 +1,5 @@
 using System;
+using System.Linq;
 using Windows.Win32;
 using Windows.Win32.Foundation;
 
@@ -6,21 +7,31 @@ namespace AMNet.Server;
 
 internal static class Config
 {
+    internal const string IOSection = "aimeio";
     private const string ConfigFileName = @".\segatools.ini";
 
-    internal const string IOSection = "aimeio";
+    /// <summary>
+    /// Valid physical card identification methods.
+    /// IDm - uses the idm of the card to generate a 20-digit identifier (also known as the 0008 number)
+    /// Access - prefer the real access code of the card. if not available (i.e. Suica card), fallback to the IDm.
+    /// </summary>
+    private static readonly string[] ValidPhysicalCardIdentifiers = ["idm", "access"];
 
     static Config()
     {
         GameId = ReadKey(IOSection, "gameId", 4);
         ServerName = ReadKey(IOSection, "serverName", 26, Environment.MachineName);
 
+        var physicalCardIdentifierPreference = ReadKey(IOSection, "physicalCardIdentifier", 10);
+        PhysicalCardIdentifierPreference = ValidPhysicalCardIdentifiers.Contains(physicalCardIdentifierPreference) ? physicalCardIdentifierPreference : ValidPhysicalCardIdentifiers[^1];
+        
         EnableAimeTxt = PInvoke.GetPrivateProfileInt(IOSection, "enableKeyboardMode", 1, ConfigFileName) > 0;
         AimeTxtPath = ReadKey("aime", "aimePath", PInvoke.MAX_PATH, @"DEVICE\aime.txt");
     }
 
     public static string GameId { get; }
     public static string ServerName { get; }
+    public static string PhysicalCardIdentifierPreference { get; }
 
     public static bool EnableAimeTxt { get; }
     public static string AimeTxtPath { get; }