AddressVerify.php

<?php
// Include required library files.
require_once('includes/config.php');
require_once('includes/paypal.class.php');

// Create PayPal object.
$PayPalConfig = array(
					'Sandbox' => $sandbox,
					'APIUsername' => $api_username,
					'APIPassword' => $api_password,
					'APISignature' => $api_signature
					);

$PayPal = new PayPal($PayPalConfig);

// Prepare request arrays
$AVFields = array
				(
				'email' => '', 							// Required. Email address of PayPal member to verify.
				'street' => '', 						// Required. First line of the postal address to verify.  35 char max.
				'zip' => ''								// Required.  Postal code to verify.  
				);
				
$PayPalRequestData = array('AVFields'=>$AVFields);

// Pass data into class for processing with PayPal and load the response array into $PayPalResult
$PayPalResult = $PayPal->AddressVerify($PayPalRequestData);

// Write the contents of the response array to the screen for demo purposes.
echo '<pre />';
print_r($PayPalResult);
?>