Flash ActionScript3 and PayPal

This is the most simply way to implement a paypal cart, this cart only have 1 item, it can be a total price of cart and one description or 1 item and quantity of items to add to cart.
You can find more info about the parameters to send to paypal in his web
myButton.addEventListener(MouseEvent.CLICK,sendToPaypal);
myButton.buttonMode=true;
function sendToPaypal(e:Event){
var [...]