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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def get_storage(self, hex_contract_address: str, hex_key: str, is_full: bool = False) -> str: """ This interface is used to get the corresponding stored value based on hexadecimal contract address and stored key. :param hex_contract_address: hexadecimal contract address. :param hex_key: a hexadecimal stored key. :param is_full: :return: the information of contract storage. """

        payload = self.generate_json_rpc_payload(RpcMethod.GET_STORAGE, [hex_contract_address, hex_key, 1])
        response = self.__post(self.__url, payload)
        if is_full:
            return response
        return response['result']