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{

//position of Key

$keypos= strpos($nvpstr,'=');

//position of value

$valuepos = strpos($nvpstr,'&') ? strpos($nvpstr,'&'): strlen($nvpstr);

/*getting the Key and Value values and storing in a Associative Array*/

$keyval=substr($nvpstr,$intial,$keypos);

$valval=substr($nvpstr,$keypos+1,$valuepos-$keypos-1);

//decoding the respose

$nvpArray[urldecode($keyval)] =urldecode( $valval);

$nvpstr=substr($nvpstr,$valuepos+1,strlen($nvpstr));

}

return $nvpArray;

}

?>

Example 2-2. expresscheckout.php

require_once ("paypalfunctions.php");

// ==================================

// PayPal Express Checkout Module

// ==================================

//'------------------------------------

//' The paymentAmount is the total value of

//' the shopping cart, which was set

//' earlier in a session variable

//' by the shopping cart page.

//'------------------------------------

$paymentAmount = $_SESSION["Payment_Amount"];

//'------------------------------------

//' The currencyCodeType and paymentType

//' are set to the selections made in the Integration Assistant.

//'------------------------------------

$currencyCodeType = "USD";

$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 in the Integration Assistant.

//'------------------------------------

$returnURL = "http://www.michaelbalderas.com/paypal/expresscheckout/OrderConfirm.php";

//'------------------------------------

//' 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 in the Integration Assistant.

//'------------------------------------

$cancelURL = "http://www.michaelbalderas.com/paypal/expresscheckout/shoppingcart.php";

//'------------------------------------

//' Calls the SetExpressCheckout API call

//'

//' The CallShortcutExpressCheckout function is defined in the file PayPalFunctions.php,

//' which is included at the top of this file.

//'-------------------------------------------------

$resArray = CallShortcutExpressCheckout ($paymentAmount, $currencyCodeType, $paymentType,

$returnURL, $cancelURL);

$ack = strtoupper($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;

}

?>

Example 2-3. billing.php

require_once ("paypalfunctions.php");

if ( $PaymentOption == "PayPal")

{ // ==================================

// PayPal Express Checkout Module

// ==================================

//'------------------------------------

//' The paymentAmount is the total value of

//' the shopping cart, which was set

//' earlier in a session variable

//' by the shopping cart page.

//'------------------------------------

$paymentAmount = $_SESSION["Payment_Amount"];

//'------------------------------------

//' When you integrate this code,

//' set the following variables with

//' shipping address details

//' entered by the user on the

//' Shipping page.

//'------------------------------------

$shipToName = "<>";

$shipToStreet = "<>";

$shipToStreet2 = "<>"; //Leave it blank if there is no value

$shipToCity = "<>";

$shipToState = "<>";

$shipToCountryCode = "<>"; //