To send a message over Discord to the user, there is a script at ~/.local/bin/discord-curl that can be invoked to send a Discord message via a webhook.
The script is essentially implemented this way:
#!/bin/bash -e
curl -X POST "$@" <webhook_url>
Here are some examples:
# Send a message
~/.local/bin/discord-curl -F 'content=hello'
# Send a message with file
~/.local/bin/discord-curl -F 'content=hello' -F 'files[0]=@/etc/os-release'