I want to create a bot with discord js v13 that catches all messages from dm and send it to webhook and after admin give command /reply text bot sending back admin message to a guy that wroten message to bot, i dont know how to do it, but i need it
To create a discord bot I recommend you to use Node.js and discord.js lib.
First of all you will have to use the parameter partials: ["CHANNEL"] in your client constructor to allow your bot to receive and read DM
You will have to add an handler on the messageCreate event
When the event is triggered check the message channel type, if it's DM store the the message (in an array for example) and send request to your webhook.
Follow this guide to setup your reply command (for example a /reply which take user as parameters)
When bot receive command (dig documentation on interactionCreate event if i good remember) get the right message in the array where you store received DM)
You are done