routeandport

Hello, I have some question here, I hope anyone can help me Is there a way to Automatic Create VPN account using WHMCS? I've search google and found some people that can do it, Im contacting them now. Also for now, all of the order is created automatic by using Google paypal IPN, so I add the custom button from paypal to my site, each button contain different package script, so when they click the button and pay, there will be mail send to their paypal email contain the VPN detail. But using that way is not good, I need WHMCS as client and support management software. So I wonder if I can add the custom paypal "Checkout" button in WHMCS to connect it to paypal script, so when the customer click different package, another different button show up from Checkout page. Thanks.