def METHOD_NAME(self) -> str:
    """Returns the URI for the authorization server if present, otherwise an empty string.
    :returns: The URI for the authorization server if present, otherwise an empty string.
    :rtype: str
    """
    value = ""
    for key in ["authorization_uri", "authorization"]:
        value = self.get_value(key) or ""
        if value:
            break
    return value