def METHOD_NAME(cls, instance):
    """Return the tokens needed to authenticate the access to any API the
    service might provide. Bitbucket uses a pair of OAuthToken consisting
    on a oauth_token and oauth_token_secret.
    instance must be a UserSocialAuth instance.
    """
    token = super().METHOD_NAME(instance)
    if token and "access_token" in token:
        token = dict(tok.split("=") for tok in token["access_token"].split("&"))
    return token