how to make hash_call("SetExpressCheckout", $nvpstr) work?

<?php

/********************************************
  	PayPal API Module

	Defines all the global variables and the wrapper functions
	********************************************/
    $PROXY_HOST = '127.0.0.1';
	$PROXY_PORT = '808';

	$SandboxFlag = true;

	//'------------------------------------
	//' PayPal API Credentials
	//' Replace <API_USERNAME> with your API Username
	//' Replace <API_PASSWORD> with your API Password
	//' Replace <API_SIGNATURE> with your Signature
	//'------------------------------------
    $API_UserName="myusername";
	$API_Password="mypassword";
	$API_Signature="myapisignature";

	// BN Code 	is only applicable for partners
    $sBNCode = "PP-ECWizard";

	/*
	' Define the PayPal Redirect URLs.
	' 	This is the URL that the buyer is first sent to do authorize payment with their paypal account
	' 	change the URL depending if you are testing on the sandbox or the live PayPal site
	'
	' For the sandbox, the URL is       https://www.sandbox.paypal.com/webscr&cmd=_express-checkout&token=
	' For the live site, the URL is        https://www.paypal.com/webscr&cmd=_express-checkout&token=
	*/

   if ($SandboxFlag == true)
	{
		$API_Endpoint = "https://api-3t.sandbox.paypal.com/nvp";
		$PAYPAL_URL = "https://www.sandbox.paypal.com/webscr?cmd=_express-checkout&token=";
	}
	else
	{
		$API_Endpoint = "https://api-3t.paypal.com/nvp";
		$PAYPAL_URL = "https://www.paypal.com/cgi-bin/webscr?cmd=_express-checkout&token=";
	}

	$USE_PROXY = false;
	$version="64";

	if (session_id() == "")
		session_start();

	/* An express checkout transaction starts with a token, that
	   identifies to PayPal your transaction
	   In this example, when the script sees a token, the script
	   knows that the buyer has already authorized payment through
	   paypal.  If no token was found, the action is to send the buyer
	   to PayPal to first authorize payment
	   */

	/*
	'-------------------------------------------------------------------------------------------------------------------------------------------
	' Purpose: 	Prepares the parameters for the SetExpressCheckout API Call.
	' Inputs:
	'		paymentAmount:  	Total value of the shopping cart
	'		currencyCodeType: 	Currency code value the PayPal API
	'		paymentType: 		paymentType has to be one of the following values: Sale or Order or Authorization
	'		returnURL:			the page where buyers return to after they are done with the payment review on PayPal
	'		cancelURL:			the page where buyers return to when they cancel the payment review on PayPal
	'--------------------------------------------------------------------------------------------------------------------------------------------
	*/

   	function CallShortcutExpressCheckout($paymentAmount, $currencyCodeType, $paymentType, $returnURL, $cancelURL,$API_Signature,$API_UserName,$API_Password)
	{
		//------------------------------------------------------------------------------------------------------------------------------------
		// Construct the parameter string that describes the SetExpressCheckout API call in the shortcut implementation

		$nvpstr="&PAYMENTREQUEST_0_AMT=". $paymentAmount;
		$nvpstr = $nvpstr . "&PAYMENTREQUEST_0_PAYMENTACTION=" . $paymentType;
		$nvpstr = $nvpstr . "&RETURNURL=" . $returnURL;
		$nvpstr = $nvpstr . "&CANCELURL=" . $cancelURL;
		$nvpstr = $nvpstr . "&PAYMENTREQUEST_0_CURRENCYCODE=" . $currencyCodeType;

		$_SESSION["currencyCodeType"] = $currencyCodeType;
		$_SESSION["PaymentType"] = $paymentType;

		//'---------------------------------------------------------------------------------------------------------------
		//' Make the API call to PayPal
		//' If the API call succeded, then redirect the buyer to PayPal to begin to authorize payment.
		//' If an error occured, show the resulting errors
		//'---------------------------------------------------------------------------------------------------------------

        echo "before";
        echo "<br/>".$paymentAmount.",".$currencyCodeType.",".$paymentType.",".$returnURL.",".$cancelURL.",".$API_Signature.",".$API_UserName.",".$API_Password;

	    $resArray=hash_call("SetExpressCheckout", $nvpstr);
        echo "after";
		$ack = strtoupper($resArray["ACK"]);

		if($ack=="SUCCESS" || $ack=="SUCCESSWITHWARNING")
		{
			$token = urldecode($resArray["TOKEN"]);
			$_SESSION['TOKEN']=$token;
		}

	    return $resArray;
   	}


    //-------------------------------------------------------------------------

// ==================================
// PayPal Express Checkout Module
// ==================================

//'------------------------------------
//' The paymentAmount is the total value of 
//' the shopping cart, that was set 
//' earlier in a session variable
//' by the shopping cart page
//'------------------------------------
$paymentAmount = "15";

//'------------------------------------
//' The currencyCodeType and paymentType
//' are set to the selections made on the Integration Assistant
//'------------------------------------
$currencyCodeType = "AUD";
$paymentType = "Sale";

//'------------------------------------
//' The returnURL is the location where buyers return to when a
//' payment has been succesfully authorized.
//'
//' This is set to the value entered on the Integration Assistant 
//'------------------------------------
$returnURL = "http://cheapwatersports.wowislandcharter.com/index.php?id=1";

//'------------------------------------
//' The cancelURL is the location buyers are sent to when they hit the
//' cancel button during authorization of payment during the PayPal flow
//'
//' This is set to the value entered on the Integration Assistant
//'------------------------------------
$cancelURL = "http://cheapwatersports.wowislandcharter.com/index.php?id=1";

//'------------------------------------
//' Calls the SetExpressCheckout API call
//'
//' The CallShortcutExpressCheckout function is defined in the file PayPalFunctions.php,
//' it is included at the top of this file.
//'-------------------------------------------------
echo "caLL";
$resArray =CallShortcutExpressCheckout($paymentAmount, $currencyCodeType, $paymentType, $returnURL, $cancelURL,$API_Signature,$API_UserName,$API_Password);


$ack = strtoupper($resArray["ACK"]);
if($ack=="SUCCESS" || $ack=="SUCCESSWITHWARNING")
{
	RedirectToPayPal ( $resArray["TOKEN"] );
} 
else  
{
	//Display a user friendly Error on the page using any of the following error information returned by PayPal
	$ErrorCode = urldecode($resArray["L_ERRORCODE0"]);
	$ErrorShortMsg = urldecode($resArray["L_SHORTMESSAGE0"]);
	$ErrorLongMsg = urldecode($resArray["L_LONGMESSAGE0"]);
	$ErrorSeverityCode = urldecode($resArray["L_SEVERITYCODE0"]);

	echo "SetExpressCheckout API call failed. ";
	echo "Detailed Error Message: " . $ErrorLongMsg;
	echo "Short Error Message: " . $ErrorShortMsg;
	echo "Error Code: " . $ErrorCode;
	echo "Error Severity Code: " . $ErrorSeverityCode;
}

?>

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