Webhooks do not work with Slack

Hello, I am trying to set up webhooks that will post to our company Slack channel when an event occurs. For example, when a photographer completes a job.
After setting up the webhook in Spiro, I get this error:

"missing_text_or_fallback_or_attachments"

I did some research and it seems that webhook request to Slack is missing required elements in the payload. Specifically, Slack expects the payload to contain one of the following fields: text, fallback, or attachments.

This should be an easy fix for the dev team. The JSON for webhooks just need the three missing fields that Slack requires.