def get_terms_of_service(self, billing_plan='electrum-per-tx-otp'):
        """
        Returns the TOS for the given billing plan as a plain/text unicode string.
        :param billing_plan: the plan to return the terms for
        """
        payload = {'billing_plan': billing_plan}
        return self.send_request('get', 'tos', payload)

        Returns the TOS for the given billing plan as a plain/text unicode string.
        :param billing_plan: the plan to return the terms for
        
electrum/plugins/trustedcoin/trustedcoin.py