我的一般答案是尝试对magento核心中的magento paypal模块进行反向工程.然后，您可以创建一个与所需功能相似的模块.

My general answer would be to try and reverse engineer the magento paypal module in magento core. Then you can create a module that will be similar to your desired functionality.

也看看 http://www.magentocommerce.com/wiki/how-到/创建付款方法模块

和 http://activecodeline.net/writing-a-custom-模块在详细的行人通道