Sign in to slack.com, create a workspace (e.g. sentinel) or reuse one.
Create channel vprofile-actions (Private).
Open api.slack.com/apps -> Create New App -> From scratch (name
vpro-act-notifications), pick the workspace -> Create app.
Incoming Webhooks -> Activate.

Add New Webhook to Workspace -> choose channel vprofile-actions -> Allow.

Copy the Webhook URL and save it. Test:
curl -X POST -H 'Content-type: application/json' \
--data '{"text":"Hello, World!"}' <YOUR_SLACK_WEBHOOK_URL>