You will need it later to invite the bot to a server. Try to give your app a unique name. Create a bot user for your app. After creating app, you need to take one further step and add a bot user to the app. You can do this on the app details page. On the

This tutorial walks through the process of creating a server, creating a bot, and writing a custom Python script to power the bot. Also check out part two, available at Make a Discord Bot with Python, Part 2 .

I'd use discordrb, a ruby gem that really makes writing your bot easy. It doesn't seem to have an event for users joining the group, but you could maintain a collection of userIDs seen before and every time someone logs in you check that collectio