1. Download the mod from the modrinth page. Fabric servers also need the FabricAPI mod.
2. Place the mod jar in the mods folder, and restart the server.
3. Change auth-type in Geyser's config to floodgate.
4. Restart the server.

Note for Fabric servers running behind a Velocity proxy

You will need to configure FabricProxyLite to allow the Fabric server to receive data from Velocity.