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See the Project Settings - Notification Policies and Repository Settings - Notification Policies for creating, deleting and editing notification policies. 

Bitbucket has a complete event subsystem that fires events whenever anything happens inside the application. For example, an event is fired whenever a branch is created or a pull request is merged.

To notify Mattermost from Bitbucket when a branch is created, your Bitbucket Administrator will set up the correct policy.  Then, when a branch is created in a repository in Bitbucket, the designated Mattermost channel will receive a notification. 

Example:

A Bitbucket user creates a branch in the repository namedApolloUI.  This repository belongs to the project Team.  This project has, for its project channels, the Mattermost channel Bitbucket.  With a "branch created" notification policy set for the project, the following notification would be seen in the Bitbucket channel upon branch creation:

The date/time of creation are shown.  The notification shows the Bitbucket project (Team), the repository (ApolloUI) and the name of the branch (adam).

Links to Bitbucket are provided for team, repository and branch.

Here are the results in Mattermost for the different notifications: