If by 'add a user to account' you meant granting direct permission to a given user in a repository within your workspace, we have the following Bitbucket API endpoint that can be used for that porpoise :
However, if you meant adding a user to a specific group in your workspace, we still just have a Bitbucket API 1.0 endpoint for that, which you can find below :
You can refer to the documentation of both endpoints above, and in case you run into any issues, feel free to ask. Also, as both of the endpoints needs the UUID of the user being added, you can get the UUID from List users from a workspace.
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