问题描述
如何用paypal ipn模拟器测试。如何在localhost或live服务器中测试它。 我得到了IPN没有发送，握手未通过验证。请查看
how to test with paypal ipn simulator. how to test it in localhost or live server. i am getting "IPN was not sent, and the handshake was not verified. Please review"
推荐答案
握手错误很可能在您的服务器/密钥库配置不符合升级的PayPal SSL加密算法时发生。
The handshake error is most likely to occur when your server/keystore config is non-compliant with the upgraded PayPal SSL encryption algorithms.
IPN模拟器将重新连接已升级的PayPal Sandbox环境Versign G5根证书/ SHA-2加密算法（btw这是一个业界标准，应该在2016年无处不在）。一旦您的IPN主机未能满足合规性，SSL连接将错误与握手问题。
IPN simulator will connect againest the PayPal Sandbox environment, which has been upgraded with Versign G5 root cert / SHA-2 encryption algorithms (btw this is an industry standard as supposed to be everywhere in 2016). Once your IPN host failed to meet the compliance, the SSL connnection will error out with handshake problems.
请参阅链接了解更多信息
Please see link for more info
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