public function searchTxn()
 {
     $logger = new PPLoggingManager('TransactionSearch');
     // ## TransactionSearchReq
     $transactionSearchReq = new TransactionSearchReq();
     // `TransactionSearchRequestType` which takes mandatory argument:
     //
     // * `Start Date` - The earliest transaction date at which to start the
     // search.
     $transactionSearchRequest = new TransactionSearchRequestType("2013-01-11T00:00:00+0530");
     $transactionSearchReq->TransactionSearchRequest = $transactionSearchRequest;
     // ## Creating service wrapper object
     // Creating service wrapper object to make API call and loading
     // configuration file for your credentials and endpoint
     $service = new PayPalAPIInterfaceServiceService();
     try {
         // ## Making API call
         // Invoke the appropriate method corresponding to API in service
         // wrapper object
         $response = $service->TransactionSearch($transactionSearchReq);
     } catch (Exception $ex) {
         $logger->error("Error Message : " + $ex->getMessage());
     }
     // ## Accessing response parameters
     // You can access the response parameters using getter methods in
     // response object as shown below
     // ### Success values
     if ($response->Ack == "Success") {
         // Search Results
         $txnSearchArray = $response->PaymentTransactions;
         foreach ($txnSearchArray as $txn) {
             // Merchant's transaction ID.
             $logger->log("Transaction ID : " . $txn->TransactionID);
         }
     } else {
         $logger->error("API Error Message : " . $response->Errors[0]->LongMessage);
     }
     return $response;
 }
<?php

$path = '../../lib';
set_include_path(get_include_path() . PATH_SEPARATOR . $path);
require_once 'services/PayPalAPIInterfaceService/PayPalAPIInterfaceServiceService.php';
require_once 'PPLoggingManager.php';
$logger = new PPLoggingManager('TransactionSearch');
$transactionSearchRequest = new TransactionSearchRequestType();
$transactionSearchRequest->StartDate = $_REQUEST['startDate'];
$transactionSearchRequest->EndDate = $_REQUEST['endDate'];
$transactionSearchRequest->TransactionID = $_REQUEST['transactionID'];
$tranSearchReq = new TransactionSearchReq();
$tranSearchReq->TransactionSearchRequest = $transactionSearchRequest;
$paypalService = new PayPalAPIInterfaceServiceService();
try {
    /* wrap API method calls on the service object with a try catch */
    $transactionSearchResponse = $paypalService->TransactionSearch($tranSearchReq);
} catch (Exception $ex) {
    include_once "../Error.php";
    exit;
}
if (isset($transactionSearchResponse)) {
    echo "<table>";
    echo "<tr><td>Ack :</td><td><div id='Ack'>{$transactionSearchResponse->Ack}</div> </td></tr>";
    echo "</table>";
    echo "<pre>";
    print_r($transactionSearchResponse);
    echo "</pre>";
}
require_once '../Response.php';