When a new card is created in one of the Trello boards, you get notified on #actioner-trello-notifications channel for new Trello cards.
Actioner continually updates the card notification to reflect any changes. Additionally, it sends relevant notifications, such as new checklist items or comments, as new replies under the original message in Slack.
To get Slack notifications for new Trello cards;
Click Get started. A Slack channel will be created with the name #actioner-trello-notifications - in which you’ll get all Trello board updates.
Actioner turns the complex into simple, allowing you to connect apps and automate workflows on a grand scale, faster and easier than ever.