Webhook to Slack

Has anyone successfully created a webhook for Slack? I've already created the bot, implemented the appropriate permission in Slack, and tested that messages are coming through using curl.

I also created the Workflow > Webhook on paperless using:

• Trigger: Document Added
• Actions: Webhook

I have the webhook url, but I don't know what to put in the body and the headers. What I want is a bot that announces that it has processed a new document on the channel I've set with the following details:

"New {document_type} from {correspondent}: {filename}. Check it here: {doc_url}"

Can someone help me please?