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if($ack=="SUCCESS")

{

$cmd = "cmd=_ap-preapproval&preapprovalkey=" . urldecode($resArray["preapprovalKey"]);

RedirectToPayPal ( $cmd );

}

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 4-3. implicitpayment.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 Implicit Payment Module

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

// Request specific required fields

$senderEmail = ""; // TODO - The PayPal account email address of the sender

// Think of it as required for an implicit payment and

// set to the same account that owns the API credentials

$actionType = "PAY";

$cancelUrl = "https://NoOp"; // There is no approval step for implicit payment

$returnUrl = "https://NoOp"; // There is no approval step for implicit payment

$currencyCode = "USD";

// An implicit payment can be a simple or parallel or chained payment

// TODO - Specify the receiver emails

// Remove or set to an empty string the array entries for receivers

// that you do not have for a simple payment, specify only

// receiver0email, and remove the other array entries

$receiverEmailArray = array(

'receiver0email',

'receiver1email',

'receiver2email',

'receiver3email',

'receiver4email',

'receiver5email'

);

// TODO - Specify the receiver amounts as the amount of money,

// for example, '5' or '5.55'. Remove or set to an empty

// string the array entries for receivers that you do not have

// for a simple payment, specify only receiver0amount, and remove

// the other array entries

$receiverAmountArray = array(

'receiver0amount',

'receiver1amount',

'receiver2amount',

'receiver3amount',

'receiver4amount',

'receiver5amount'

);

// TODO - Specify values ONLY if you are doing a chained payment

// If you are doing a chained payment, then set ONLY 1 receiver in the

// array to 'true' as the primary receiver, and set the other receivers

// corresponding to those indicated in receiverEmailArray to 'false'

// Make sure that you do NOT specify more values

// in this array than in the receiverEmailArray

$receiverPrimaryArray = array(

'',

'',

'',

'',

'',

''

);

// TODO - Set invoiceId to uniquely identify the transaction

// associated with each receiver

// Set the array entries with value for receivers that you have

// Each of the array values must be unique

$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.

$feesPayer = ""; // For an implicit payment use case, this cannot be "SENDER"

$ipnNotificationUrl = "";

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

$pin = ""; // No pin for an implicit payment use case

$preapprovalKey = ""; // No preapprovalKey for an implicit use case

$reverseAllParallelPaymentsOnError = ""; // Only specify if you are doing a

//parallel payment as your implicit

//payment

$trackingId = generateTrackingID();