Paypal IPN模拟器（https://developer.paypal.com/developer/ipnSimulator/）不在我的网站上发送信息（https website.com / subscription / ipn）：
IPN was not sent, and the handshake was not verified. Please review your information.
但它适用于我的另一个网站（https website2.com），没有IPN控制器的特定页面：
IPN was sent and the handshake was verified.