def get_authc_info(self, identifier, session=None):
        """
        If an Account requires credentials from multiple data stores, this
        AccountStore is responsible for aggregating them (composite) and returning
        the results in a single account object.

        :returns: a dict of account attributes
        """
        user = self._get_user_query(session, identifier).first()

        creds = self._get_credential_query(session, identifier).all()
        if not creds:
            return None
        authc_info = {cred_type: {'credential': cred_value, 'failed_attempts': []}
                      for cred_type, cred_value in creds}

        if 'totp_key' in authc_info:
            authc_info['totp_key']['2fa_info'] = {'phone_number': user.phone_number}

        return dict(account_locked=user.account_lock_millis, authc_info=authc_info)