<mention>which is used to mention the user who has joined, the next to mention is the user count which is a simple
<userCount>and lastly, the server name which is simply
Welcome @Shindou Mihou to My Server! You are our special 99th member!
config leaveand the process will also be the same, example.
config [welcome/leave] disablewhich will simply remove the channel set, to re-enable to function, all you would have to do is simply set the channel once more.