Add the discord bot to your server with this link.
Send APRS messages to DISCRD prefixed with the channel id. You can get the channel ID by doing /aprs.
Use /sendaprs [to_call] [from_call] [aprs_passcode] [message]
APRS is unencrypted, and basically unauthenicated. Keep this in mind. Best practice is to limit the bot to a single channel specific for APRS messages.
You shouldn't need to run your own bot but if you want to the easiest way is using docker
docker build -t aprsdiscord .
docker run -e CALLSIGN=YOUR_CALLSIGN -e DISCORD_TOKEN=BOT_TOKEN -e SERVER_NAME=APRS_SERVER_NAME aprsdiscordDO NOT USE DISCRD as your SERVER_NAME!!!