Since bitbucket no longer supported the use of username. We must instead use User uuid for accessing the bitbucket api's.
Depreciated or Earlier
Latest
https://api.bitbucket.com/2.0/users/558050:c0b72ad0-1cb5-4018-9cdc-0cde8492c443
You can make a GET request for a repository that you own and see your UUID listed under the owner
attribute:
curl https://api.bitbucket.org/2.0/repositories/1team/moxie
Or you could possibly make a GET request for all team members of a team you're a part of and see their UUID's there
curl https://api.bitbucket.org/2.0/teams/1team/members
Info taken from https://developer.atlassian.com/bitbucket/api/2/reference/meta/uri-uuid#repo-obj