global $gCms;
$config = &$gCms->GetConfig();

$type = ($params['type'] != '') ? $params['type'] : "cart";
$name = $params['name'];
$price = $params['price'];
$id = $params['id'];
$extra = $params['extra'];
$weight = $params['weight'];
$email = "YOUR PAYPAL EMAIL ADDRESS";
$buttondata = array(
 "business" => $email,
 "item_name" => $name,
 "amount" => $price,
 "no_shipping" => 2, // shipping required
 "return" => $config['root_url']."/",
 "cancel_return" => $config['root_url']."/",
 "currency_code" => "USD",
 "bn" => "PP-BuyNowBF",
);
if ($id != '')
 $buttondata['item_number'] = $id;
if ($weight != '') {
 $buttondata['weight'] = $weight;
 $buttondata['weight_unit'] = 'lbs';
}
if ($type == "cart") {
 $buttondata['cmd'] = "_cart";
 $buttondata['add'] = "1";
}
elseif ($type == "buy")
 $buttondata['cmd'] = "_xclick";
elseif ($type == "donate")
 $buttondata['cmd'] = "_donations";
elseif ($type == "subscribe")
 $buttondata['cmd'] = "_subscribe";
else {
 echo "Bad button type $type.";
 return;
}

include "PATH TO FORBIDDEN DIRECTORY/paypal_encrypt.php"

if ($extra != "")
 $ret = encrypt_paypal_button($buttondata, $type, "paypal_button", $extra);
else
 $ret = encrypt_paypal_button($buttondata, $type, "paypal_button");

if ($ret[0] === true)
 echo $ret[1];
else
 echo "<p>Error: &nbsp;<code>{$ret[1]}</code></p>";