diff --git a/MareSynchronosAPI/API.cs b/MareSynchronosAPI/API.cs
index 9162756..4637c64 100644
--- a/MareSynchronosAPI/API.cs
+++ b/MareSynchronosAPI/API.cs
@@ -2,7 +2,7 @@
 {
     public class Api
     {
-        public const int Version = 14;
+        public const int Version = 15;
         public const string Path = "/mare";
 
         public const string SendFileAbortUpload = "AbortUpload";
@@ -42,5 +42,20 @@
         public const string OnUserReceiveCharacterData = "ReceiveCharacterData";
         public const string OnUserRemoveOnlinePairedPlayer = "RemoveOnlinePairedPlayer";
         public const string OnUserAddOnlinePairedPlayer = "AddOnlinePairedPlayer";
+
+        public const string InvokeGroupChangePassword = "GroupChangePassword";
+        public const string InvokeGroupCreate = "CreateGroup";
+        public const string InvokeGroupGetGroups = "GetGroups";
+        public const string InvokeGroupGetUsersInGroup = "GetUsersInGroup";
+        public const string SendGroupChangeInviteState = "GroupChangeInviteState";
+        public const string SendGroupDelete = "DeleteGroup";
+        public const string SendGroupJoin = "JoinGroup";
+        public const string SendGroupLeave = "LeaveGroup";
+        public const string SendGroupPause = "PauseGroup";
+        public const string SendGroupRemoveUser = "RemoveUserFromGroup";
+        public const string SendGroupChangeOwner = "ChangeOwnerOfGroup";
+
+        public const string OnGroupChange = "OnGroupPushChange";
+        public const string OnGroupUserChange = "OnGroupUserChange";
     }
 }
diff --git a/MareSynchronosAPI/GroupCreatedDto.cs b/MareSynchronosAPI/GroupCreatedDto.cs
new file mode 100644
index 0000000..d67373e
--- /dev/null
+++ b/MareSynchronosAPI/GroupCreatedDto.cs
@@ -0,0 +1,8 @@
+namespace MareSynchronos.API
+{
+    public record GroupCreatedDto
+    {
+        public string GID { get; set; }
+        public string Password { get; set; }
+    }
+}
diff --git a/MareSynchronosAPI/GroupDto.cs b/MareSynchronosAPI/GroupDto.cs
new file mode 100644
index 0000000..967a29f
--- /dev/null
+++ b/MareSynchronosAPI/GroupDto.cs
@@ -0,0 +1,12 @@
+namespace MareSynchronos.API
+{
+    public record GroupDto
+    {
+        public string GID { get; set; }
+        public string OwnedBy { get; set; }
+        public bool InvitesEnabled { get; set; }
+        public bool IsPaused { get; set; }
+        public bool IsDeleted { get; set; }
+        public string Alias { get; set; }
+    }
+}
diff --git a/MareSynchronosAPI/GroupPairDto.cs b/MareSynchronosAPI/GroupPairDto.cs
new file mode 100644
index 0000000..632d545
--- /dev/null
+++ b/MareSynchronosAPI/GroupPairDto.cs
@@ -0,0 +1,11 @@
+namespace MareSynchronos.API
+{
+    public record GroupPairDto
+    {
+        public string GroupGID { get; set; }
+        public string UserUID { get; set; }
+        public string UserAlias { get; set; }
+        public bool IsPaused { get; set; }
+        public bool IsRemoved { get; set; }
+    }
+}
\ No newline at end of file