求帮助，关于paypal支付返回值修改订单状态
我想要一个在网站上下订单，用paypal支付成功后返回值到网站指定的页面，根据支付成功或失败修改订单状态为已支付成功或支付失败。
请各路高手帮助解决困惑我许久的难题！！！！！！！！！！！
请提供完整的代码或实例。
要求php语言。
我想要的是从form下单开始－支付－返回值－更改订单状态。
回复讨论(解决方案)
开启payapl ipn。
当paypal付费成功，会调用你服务器上一条url，并把相关参数传到这条url的。
开启payapl ipn。
当paypal付费成功，会调用你服务器上一条url，并把相关参数传到这条url的。
返回后获取参数的方法是什么？比如获取单订号。
http://wenku.baidu.com/link?url=faqOOSTIWt0eLY--YElfTS83HuEmTvjL68T8ErDB4mivuroho2OvUyCkNZWCNrbYb4nK64JRir55hNtt4fm7DQqnFMjmBaJB4CH-5LJZ8ei
开启payapl ipn。
当paypal付费成功，会调用你服务器上一条url，并把相关参数传到这条url的。
返回后获取参数的方法是什么？比如获取单订号。
你在你的接收url中，加入
print_r($_REQUEST);
?>
就知道paypal有什?返回?你了。
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