Now supports saving card groups, this is probably the ugliest code ive ever written but anything to avoid 20 cardgroup properties. we should see if there's a better way, it could probably be a lot cleaner

TOOHUCardAPI/DTO/AbstractResponse.cs

@@ -0,0 +1,14 @@
+using System.Text.Json.Serialization;
+using Newtonsoft.Json;
+
+namespace TOOHUCardAPI.DTO
+{
+    public abstract class AbstractResponse
+    {
+        public static string SUCCESS_CODE = "0000";
+        [JsonProperty("code")]
+        public string Code { get; set; } = SUCCESS_CODE;
+        [JsonProperty("msg")]
+        public string Message { get; set; } = string.Empty;
+    }
+}