Update API

LineMessaging/Apis/LineMessageUtils.cs

@@ -0,0 +1,27 @@
+using System;
+using System.Threading.Tasks;
+
+namespace LineMessaging
+{
+    public partial class LineMessagingClient
+    {
+        private const string GroupProfileApiPath = "v2/bot/group/{0}/summary";
+        private const string QuotaApiPath = "/v2/bot/message/quota/consumption";
+
+        public async Task<int> GetTotalUsage()
+        {
+            return Get<LineUsage>(QuotaApiPath).Result.TotalUsage;
+        }
+
+
+
+        public async Task<LineGroupProfile> GetGroupProfile(string groupId)
+        {
+            if (string.IsNullOrEmpty(groupId))
+            {
+                throw new ArgumentException($"{nameof(groupId)} is null or empty.");
+            }
+            return await Get<LineGroupProfile>(string.Format(GroupProfileApiPath, groupId));
+        }
+    }
+}