Posts messages into a Teams channel through an incoming webhook: deployment notices, an approval that needs a human, an alert worth interrupting someone for. The webhook URL is the credential, and anyone holding it can post to that channel, which is exactly why it belongs in the platform rather than in a repository. One URL is one channel, so an application that posts to two channels holds two connections, the second under a prefix.
Microsoft Teams's own documentation →TEAMS_WEBHOOK_URL