Slack Calls API

Slack's Calls API lets apps represent thirdparty voice or video calls inside Slack by creating a call object with a join URL and metadata, so users see a rich call message with a Join button, status, and participant list in channels or DMs. Through endpoints to create, update, and end callsand to add or remove participantsan app can keep that call message in sync as people join or leave and as the call progresses. The API doesn't handle the media itself; it's for coordinating and rendering the Slack UI around calls hosted by services like Zoom or Webex, making it easy to start, find, and join those calls from Slack.