DiscordRolesync is a plugin for syncing your discord roles with discourse groups. short tutorial video
Follow Install a Plugin
how-to from the official Discourse Meta, using git clone https://github.com/spirobel/discord-rolesync.git
as the plugin command. You need to create a personal access token according to: https://docs.github.com/en/github/authenticating-to-github/creating-a-personal-access-token (with repo rights) and attach it to the git clone link as described int the "install a plugin" thread. If you need pictures for the next two steps look at the Getting Started section of this tutorial https://www.howtogeek.com/364225/how-to-make-your-own-discord-bot/
you also need to setup discord login in your disource instance. This requires putting your discordapp clientid and your client secret in the respective settings in the discourse admin panel. The discourse admin panel will provide you with a link on how to create your discordapp if you search for the discord settings. You can also follow this guide: https://meta.discourse.org/t/configuring-discord-login-for-discourse/127129
Replace CLIENTID with the clientid of your dicordapp that you created when enabling the discord login in the discourse admin panel. You can find the clientid in your discourse admin settings or on: https://discord.com/developers/applications
https://discordapp.com/oauth2/authorize?client_id=CLIENTID&scope=bot
go to https://discord.com/developers/applications create a bot and copy the access token into the discord_rolyesync_token setting of this plugin. the bot needs to have intents enabled: Screenshot-2021-03-16-Discord-Developer-Portal-API-Docs-for-Bots-and-Developers.png
go to the the group that you would like to sync with your discord role and attach the discord role id you want to sync it with. If you don't know how to find the id of your role, check out this tutorial: https://discordhelp.net/role-id
Every time a user has roles add / removed on discord, he will be added / removed from the discourse groups according to the discord roles he possesses. This affects only discourse groups that have a discord role id assigned.
Make sure your bot is only connected to one (your) discord server. On discourse plugin initialization the bot will be created and it checks which discord server it is connected to. This server will later be used to query which roles its members have when they login to your discourse.
if you assign a role id to a group you decide to manage access to this group through discord. So if a user wants to stay in this group he needs to connect his discord account to discourse.
the reason why this plugin needs to act on all logins and not just the logins that happen through discord is this: suppose you have a paid group on discord. A user joins this group. Logs into discourse with discord. disconnects his discord account in discourse. Cancels his payment. Now he is still part of the special discourse group and no one expects it because its expected that they are synced. the remedy to this is to create discourse groups that fit no other purpose than being synced to discord roles.