public function voidCharge($chargeId , RequestModels\ChargeVoid
                                            $requestModel)
    {

        $chargeMapper = new ChargesMapper($requestModel);

        $requestPayload = array (
            'authorization' => $this->_apiSetting->getSecretKey(),
            'mode'          => $this->_apiSetting->getMode(),
            'postedParam'   => $chargeMapper->requestPayloadConverter(),

        );
        $refundUri = sprintf ($this->_apiUrl->getVoidChargesApiUri(),$chargeId);

        $processCharge = \com\checkout\helpers\ApiHttpClient::postRequest($refundUri,
            $this->_apiSetting->getSecretKey(),$requestPayload);

        $responseModel = new ResponseModels\Charge($processCharge);


        return $responseModel;
    }