def get_balance(self):
response = util.call_api("<STR_LIT>".format(self.identifier), self.build_basic_request(),<EOL>base_url=self.service_url)<EOL>json_response = json.loads(response)<EOL>self.parse_error(json_response)<EOL>return json_response.get('<STR_LIT>')<EOL>
Fetch the wallet balance. Includes unconfirmed transactions
        and possibly double spends.

        :return: wallet balance in satoshi