public function process($data)
 {
     //Construct the request
     $request = new PxPayRequest();
     $request->setAmountInput($data['Amount']);
     $request->setCurrencyInput($data['Currency']);
     //Set PxPay properties
     if (isset($data['Reference'])) {
         $request->setMerchantReference($data['Reference']);
     }
     if (isset($data['EmailAddress'])) {
         $request->setEmailAddress($data['EmailAddress']);
     }
     $request->setUrlFail($this->cancelURL);
     $request->setUrlSuccess($this->returnURL);
     //Generate a unique identifier for the transaction
     $request->setTxnId(uniqid('ID'));
     $request->setTxnType('Purchase');
     //Get encrypted URL from DPS to redirect the user to
     $request_string = $this->makeProcessRequest($request, $data);
     //Obtain output XML
     $response = new MifMessage($request_string);
     //Parse output XML
     $url = $response->get_element_text('URI');
     $valid = $response->get_attribute('valid');
     //If this is a fail or incomplete (cannot reach gateway) then mark payment accordingly and redirect to payment
     if ($valid && is_numeric($valid) && $valid == 1) {
         //Redirect to payment page
         Controller::curr()->redirect($url);
     } else {
         if (is_numeric($valid) && $valid == 0) {
             return new PaymentGateway_Failure();
         } else {
             return new PaymentGateway_Incomplete();
         }
     }
 }
function redirect_form()
{
    global $pxpay;
    $request = new PxPayRequest();
    $http_host = getenv("HTTP_HOST");
    $request_uri = getenv("SCRIPT_NAME");
    $server_url = "http://{$http_host}";
    #$script_url  = "$server_url/$request_uri"; //using this code before PHP version 4.3.4
    #$script_url  = "$server_url$request_uri"; //Using this code after PHP version 4.3.4
    $script_url = version_compare(PHP_VERSION, "4.3.4", ">=") ? "{$server_url}{$request_uri}" : "{$server_url}/{$request_uri}";
    # the following variables are read from the form
    $Quantity = $_REQUEST["Quantity"];
    $MerchantReference = $_REQUEST["Reference"];
    $Address1 = $_REQUEST["Address1"];
    $Address2 = $_REQUEST["Address2"];
    $Address3 = $_REQUEST["Address3"];
    #Calculate AmountInput
    $AmountInput = 19.95 * $Quantity;
    #Generate a unique identifier for the transaction
    $TxnId = uniqid("ID");
    #Set PxPay properties
    $request->setMerchantReference($MerchantReference);
    $request->setAmountInput($AmountInput);
    $request->setTxnData1($Address1);
    $request->setTxnData2($Address2);
    $request->setTxnData3($Address3);
    $request->setTxnType("Purchase");
    $request->setCurrencyInput("NZD");
    $request->setEmailAddress("*****@*****.**");
    $request->setUrlFail($script_url);
    # can be a dedicated failure page
    $request->setUrlSuccess($script_url);
    # can be a dedicated success page
    $request->setTxnId($TxnId);
    #The following properties are not used in this case
    # $request->setEnableAddBillCard($EnableAddBillCard);
    # $request->setBillingId($BillingId);
    # $request->setOpt($Opt);
    #Call makeRequest function to obtain input XML
    $request_string = $pxpay->makeRequest($request);
    #Obtain output XML
    $response = new MifMessage($request_string);
    #Parse output XML
    $url = $response->get_element_text("URI");
    $valid = $response->get_attribute("valid");
    #Redirect to payment page
    header("Location: " . $url);
}
$pxpay = new PxPay_Curl('https://sec.paymentexpress.com/pxpay/pxaccess.aspx', $PxPay_Userid, $PxPay_Key);
//Create a new request object
$request = new PxPayRequest();
//prepare the url to come back to once payment has been complete
$http_host = getenv('HTTP_HOST');
//localhost. if online than domain name
$folders = getenv('SCRIPT_NAME');
$urlToComeBackTo = 'http://' . $http_host . $folders;
//loopthrough cart and calculate the grand total
$grandTotal = 0;
foreach ($_SESSION['cart'] as $cartItem) {
    $grandTotal += $cartItem['quantity'] * $cartItem['price'];
}
//prepare data for PxPay
$request->setAmountInput($grandTotal);
$request->setTxnType('Purchase');
//transaction type
$request->setCurrencyInput('NZD');
$request->setUrlFail(PROJECT_ROOT . 'payment-response.php');
$request->setUrlSuccess(PROJECT_ROOT . 'payment-response.php');
$request->setTxnData1('Nehal Patel');
$request->setTxnData2('20 Kent Terrace, Wellington, NZ');
$request->setTxnData3('Somthing else');
//Prepare the request string out of the request data
$requestString = $pxpay->makeRequest($request);
//send the request to be processed
$response = new MifMessage($requestString);
//extract the url so we can redirect the user
$urlToGoTo = $response->get_element_text('URI');
//redirect the user
header('Location: ' . $urlToGoTo);
 function startPaymentProcess()
 {
     if (!$this->TxnId) {
         $this->TxnId = uniqid("ID");
     }
     $request = new PxPayRequest();
     #Set PxPay properties
     if ($this->MerchantReference) {
         $request->setMerchantReference($this->MerchantReference);
     } else {
         user_error("error in DpsPxPayComs::startPaymentProcess, MerchantReference not set. ", E_USER_WARNING);
     }
     if ($this->AmountInput) {
         $request->setAmountInput($this->AmountInput);
     } else {
         user_error("error in DpsPxPayComs::startPaymentProcess, AmountInput not set. ", E_USER_WARNING);
     }
     if ($this->TxnData1) {
         $request->setTxnData1($this->TxnData1);
     }
     if ($this->TxnData2) {
         $request->setTxnData2($this->TxnData2);
     }
     if ($this->TxnData3) {
         $request->setTxnData3($this->TxnData3);
     }
     if ($this->TxnType) {
         $request->setTxnType($this->TxnType);
     } else {
         user_error("error in DpsPxPayComs::startPaymentProcess, TxnType not set. ", E_USER_WARNING);
     }
     if ($this->CurrencyInput) {
         $request->setCurrencyInput($this->CurrencyInput);
     } else {
         user_error("error in DpsPxPayComs::startPaymentProcess, CurrencyInput not set. ", E_USER_WARNING);
     }
     if ($this->EmailAddress) {
         $request->setEmailAddress($this->EmailAddress);
     }
     if ($this->UrlFail) {
         $request->setUrlFail($this->UrlFail);
     } else {
         user_error("error in DpsPxPayComs::startPaymentProcess, UrlFail not set. ", E_USER_WARNING);
     }
     if ($this->UrlSuccess) {
         $request->setUrlSuccess($this->UrlSuccess);
     } else {
         user_error("error in DpsPxPayComs::startPaymentProcess, UrlSuccess not set. ", E_USER_WARNING);
     }
     if ($this->TxnId) {
         $request->setTxnId($this->TxnId);
     }
     if ($this->EnableAddBillCard) {
         $request->setEnableAddBillCard($this->EnableAddBillCard);
     }
     if ($this->BillingId) {
         $request->setBillingId($this->BillingId);
     }
     /* TODO:
     		$request->setEnableAddBillCard($EnableAddBillCard);
     		$request->setBillingId($BillingId);
     		$request->setOpt($Opt);
     		*/
     #Call makeRequest function to obtain input XML
     $request_string = $this->PxPayObject->makeRequest($request);
     #Obtain output XML
     $this->response = new MifMessage($request_string);
     #Parse output XML
     $url = $this->response->get_element_text("URI");
     //$valid = $this->response->get_attribute("valid");
     #Redirect to payment page
     return $url;
 }