A PayPal sample code with PHP Pear

$database = new Database($yourconfig);
$order = database->getOrder((int)$order_id);
if($order->status != 'Payable'){
	redirect(base_url().'order/show');
	exit();
}
include('HTTP/Request2.php');
$conf = array('ssl_verify_peer' => false, 'ssl_verify_host' => false);
$req =& new HTTP_Request2("https://api-3t.sandbox.paypal.com/nvp/", HTTP_Request2::METHOD_POST, $conf);
if(empty($order->token) || $order->token_expire < time()){//Create new token
	$SetExpressCheckout = array(
		"USER" => "info_1283974049_biz_api2.XXXXX.com",
		"PWD" => "XXXXX",
		"SIGNATURE" => "XX-XX-XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX",
		"VERSION"=> "63.0",
		"RETURNURL"=> base_url()."order/paypalreturn/",
		"CANCELURL" => base_url()."order/paypalcancel/",
		"METHOD"=> "SetExpressCheckout",
		"HDRIMG" => "http://example.org/logo.png",
		"LANDINGPAGE" => "billing",
		"CHANNELTYPE" => "merchant",
		"BRANDNAME" => "EXAMPLE GMBH",
		"NOSHIPPING" => '1',
		"PAYMENTREQUEST_0_AMT" => (string)$order->price,
		"PAYMENTREQUEST_0_CURRENCYCODE" => 'EUR',
		//"PAYMENTREQUEST_0_SHIPDISCAMT" => '-1.00',
		//"PAYMENTREQUEST_0_SHIPPINGAMT" => '2.00',
		"PAYMENTREQUEST_0_DESC" => 'Order description',
		"PAYMENTREQUEST_0_PAYMENTACTION"=> "Sale"
	);
	$req->addPostParameter($SetExpressCheckout);
	$body = $req->send()->getBody();
	$body = responseParse($body);
	$database->set_token((int)$order->id, (string)$body['TOKEN'], (int)time()+7200);//Add 2h expire time
	redirect("https://www.sandbox.paypal.com/cgi-bin/webscr?cmd=_express-checkout&useraction=commit&token=".$body['TOKEN']);
}else //Use cached token
	redirect("https://www.sandbox.paypal.com/cgi-bin/webscr?cmd=_express-checkout&useraction=commit&token=".$order->token);

$database = new Database($yourconfig); $order = database->getOrder((int)$order_id); if($order->status != 'Payable'){ redirect(base_url().'order/show'); exit(); } include('HTTP/Request2.php'); $conf = array('ssl_verify_peer' => false, 'ssl_verify_host' => false); $req =& new HTTP_Request2("https://api-3t.sandbox.paypal.com/nvp/", HTTP_Request2::METHOD_POST, $conf); if(empty($order->token) || $order->token_expire < time()){//Create new token $SetExpressCheckout = array( "USER" => "info_1283974049_biz_api2.XXXXX.com", "PWD" => "XXXXX", "SIGNATURE" => "XX-XX-XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX", "VERSION"=> "63.0", "RETURNURL"=> base_url()."order/paypalreturn/", "CANCELURL" => base_url()."order/paypalcancel/", "METHOD"=> "SetExpressCheckout", "HDRIMG" => "http://example.org/logo.png", "LANDINGPAGE" => "billing", "CHANNELTYPE" => "merchant", "BRANDNAME" => "EXAMPLE GMBH", "NOSHIPPING" => '1', "PAYMENTREQUEST_0_AMT" => (string)$order->price, "PAYMENTREQUEST_0_CURRENCYCODE" => 'EUR', //"PAYMENTREQUEST_0_SHIPDISCAMT" => '-1.00', //"PAYMENTREQUEST_0_SHIPPINGAMT" => '2.00', "PAYMENTREQUEST_0_DESC" => 'Order description', "PAYMENTREQUEST_0_PAYMENTACTION"=> "Sale" ); $req->addPostParameter($SetExpressCheckout); $body = $req->send()->getBody(); $body = responseParse($body); $database->set_token((int)$order->id, (string)$body['TOKEN'], (int)time()+7200);//Add 2h expire time redirect("https://www.sandbox.paypal.com/cgi-bin/webscr?cmd=_express-checkout&useraction=commit&token=".$body['TOKEN']); }else //Use cached token redirect("https://www.sandbox.paypal.com/cgi-bin/webscr?cmd=_express-checkout&useraction=commit&token=".$order->token);