discord:
  test:
    endpoint: https://discord.com/api/webhooks/.../...
    username: Test Logs
    content: A Warzone has spawned at ***! Get there quickly...

  hacks:
    endpoint: https://discord.com/api/webhooks/.../...
    username: Hack Logs
    avatar_url: https://cdn3.emoji.gg/emojis/3213-banhammer.png

This will return "this is a test" into the channel.

"arma_webhooks" callExtension ["discord", ["hacks", "this is a test"]];

To save yourself from writing the same logs/entries all the time you can use the shorthand feature that is built into the extension. Providing that you have added a content option with a string with a match point defined using ***

"arma_webhooks" callExtension ["discord", ["test", "Kavala"]];

The output of this would look like: "A Warzone has spawned at Kavala Get there quickly..."