It appears that there used to be Bitbucket Connector for Microsoft Teams (I saw screen shots), but it's not shown in Store of Microsoft Teams. Without an App, is it possible to link a Bitbucket repo to a Micrsoft Teams channel?
Looking at this article
https://medium.com/@devlead/switching-to-microsoft-teams-a647b9eab982
and this one
https://confluence.atlassian.com/bitbucket/manage-webhooks-735643732.html
it appears that it might be possble to link a repo to Teams channel via a webhook.
But then what is the URL required for configuring such a webhook?
Or is it impossible now?