POST /v1/orgs/{orgId}/integrations/slack/callback

Completes connecting a Slack workspace to the organization with the code and state Slack sent to the redirect URI, and returns the connection. Returns 400 when the state was not issued to the caller for this organization or has expired, or when Slack refuses the code. Connecting a Slack workspace the organization already holds for the same app replaces the earlier connection. Returns 503 when this instance cannot connect Slack workspaces.