PAYPAL IPN和PDT失败

Question

I am working on a ordering system, where the payment is taken using PayPal. 我正在使用一个订购系统，该系统使用PayPal进行付款。

Currently have issues with IPN. 目前与IPN有关。

I have used the sample IPN code provided via this link below: 我使用了通过以下链接提供的示例IPN代码：

https://github.com/paypal/ipn-code-samples/blob/master/paypal_ipn.php

However every time I test IPN via IPN Simulator it shows below error: 但是，每次我通过IPN模拟器测试IPN时，都会显示以下错误：

IPN was not sent, and the handshake was not verified. Please review your information.

Answer 1

许多人建议IPN模拟器已损坏。