您可以使用Mobile Express Checkout来完成。所有信息，这里。它很容易集成到您的应用程序中。您需要一个服务器端应用程序来进行一些Paypal呼叫，因为从手机上制作它们是不安全的。

You could do it using Mobile Express Checkout. All the info, here. Its very easy to integrate within your app. You will need a server side app though to make some of the Paypal calls, as it would not be safe to make them from the phone.