PayPal REST API 和经典 NVP/SOAP API 之间有什么区别? - What are differences between PayPal REST APIs, and Classic NVP/SOAP APIs?
PayPal:将第三方购物车与加密的网站付款集成在一起 - PayPal: integrating third party shopping cart with encrypted website payment
是否可以使用PayPal REST API向卡客户端收取费用? - Is it possible to use the PayPal REST APIs to charge a card client side?