php paypal ipn解决方法
php paypal ipn
这个php paypal ipn到底怎么用的？
我网上找了很多代码，有人写好的类，直接就能调用就可以，底下回复也是可以用得。
为啥我用就不行呢？我在sandbox里面测试一直都不行啊！
是不是在sandbox里面 test tool点 send IPN， 然后打开自己服务器上的ipn.php就测试了？
还是说我在sandbox里测试方法不对？？
有谁用过ipn，教教我怎么用啊
------解决方案--------------------
IPN本质上是一个URL回调功能，你测试的方法是对的。
需要注意的是，回调的URL端口必须是80
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