This plugin uses https://bitbucket.org/api/.. as it's base URL. This is not a valid or even supported URL on Bitbucket. It currently happens to work, but won't in the future.

As per the documentation, Bitbucket's API lives on https://api.bitbucket.org

https://developer.atlassian.com/bitbucket/api/2/reference/meta/uri-uuid#uri-structure