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$receiverInvoiceIdArray = array(

'',

'',

'',

'',

'',

''

);

// Request specific optional fields

// Provide a value for each field that you want to include in the request;

// if left as an empty string, the field will not be passed in the request

$senderEmail = ""; // TODO - If you are executing the Pay call against a

// preapprovalKey, you should set senderEmail

// It is not required if the web approval flow immediately

// follows this Pay call

$feesPayer = "";

$ipnNotificationUrl = "";

$memo = ""; // maxlength is 1000 characters

$pin = ""; // TODO - If you are executing the Pay call against an existing

// preapproval that requires a pin, then you must set this

$preapprovalKey = ""; // TODO - If you are executing the Pay call against

// an existing preapproval, set the preapprovalKey here

$reverseAllParallelPaymentsOnError = ""; // TODO - Set this to "true" if you would

// like each parallel payment to be reversed

// if an error occurs

// Defaults to "false" if you don't specify

$trackingId = generateTrackingID(); // generateTrackingID function is found

// in paypalplatform.php

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

// Make the Pay API call

//

// The CallPay function is defined in the paypalplatform.php file,

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

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

$resArray = CallPay ($actionType, $cancelUrl, $returnUrl, $currencyCode,

$receiverEmailArray, $receiverAmountArray, $receiverPrimaryArray,

$receiverInvoiceIdArray, $feesPayer, $ipnNotificationUrl, $memo,

$pin, $preapprovalKey, $reverseAllParallelPaymentsOnError,

$senderEmail, $trackingId

);

$ack = strtoupper($resArray["responseEnvelope.ack"]);

if($ack=="SUCCESS")

{

if ("" == $preapprovalKey)

{

// redirect for web approval flow

$cmd = "cmd=_ap-payment&paykey=" . urldecode($resArray["payKey"]);

RedirectToPayPal ( $cmd );

}

else

{

// payKey is the key that you can use to identify the result from this Pay call

$payKey = urldecode($resArray["payKey"]);

// paymentExecStatus is the status of the payment

$paymentExecStatus = urldecode($resArray["paymentExecStatus"]);

}

}

else

{

//Display a user-friendly Error on the page using any of the following error

//information returned by PayPal.

//TODO - There can be more than 1 error, so check for "error(1).errorId",

// then "error(2).errorId", and so on until you find no more errors.

$ErrorCode = urldecode($resArray["error(0).errorId"]);

$ErrorMsg = urldecode($resArray["error(0).message"]);

$ErrorDomain = urldecode($resArray["error(0).domain"]);

$ErrorSeverity = urldecode($resArray["error(0).severity"]);

$ErrorCategory = urldecode($resArray["error(0).category"]);

echo "Preapproval API call failed. ";

echo "Detailed Error Message: " . $ErrorMsg;

echo "Error Code: " . $ErrorCode;

echo "Error Severity: " . $ErrorSeverity;

echo "Error Domain: " . $ErrorDomain;

echo "Error Category: " . $ErrorCategory;

}

?>

Example 4-6. chainedpayment.php

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

// When you integrate this code,

// look for TODO as an indication

// that you may need to provide a value or take

// action before executing this code.

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

require_once ("paypalplatform.php");

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

// PayPal Platform Chained Payment Module

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

// Request specific required fields

$actionType = "PAY";

$cancelUrl = "https://mycancelurl"; // TODO - If you are not executing the Pay call

// for a preapproval, then you must set a valid

// cancelUrl for the web approval flow that

// immediately follows this Pay call

$returnUrl = "https://myreturnurl"; // TODO - If you are not executing the Pay call

// for a preapproval, then you must set a valid

// returnUrl for the web approval flow that

// immediately follows this Pay call

$currencyCode = "USD";

// A chained payment can be made with 1 primary receiver and between 1 and 5 secondary

// receivers

//