possibilities:

How to use:

usingShablePrefics;...//when bot is readyprivateasyncTaskOnReady(){/*            if you connecting Shable prefix first time,            before checking you must to create json file for guilds and their prefixes.            Just write await Prefix.StartShable(), and you don't have to touch it anymore.            */awaitPrefix.StartShable();//ready stuff}...//your command handlerprivateasyncTaskHandleCommandAsync(SocketMessagerawMessage){//your code/*            when you're checking for prefix you must replace your default string prefix with            await Prefix.GetPrefix(guild that requested(Example: context.Guild), default prefix of your bot)            */if(message.HasStringPrefix(awaitPrefix.GetPrefix(context.Guild,_defaultPrefics),refargPos)&&!(message.HasMentionPrefix(_client.CurrentUser,refargPos))){//command responding etc}}