About Alipay callback using HTTPS

After the server installed the SSL certificate, it changed all request entrances and exits to https. As a result, Alipay payment could not receive callbacks. The official Alipay document said that "the root certificate is built into the trusted root certificate library of JDK 1.6 by default." I don't quite understand. What is the specific operation to receive the callback? Are there any technical experts who have dealt with related issues? urgent. . Now temporarily changed to http

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After the server installed the SSL certificate, it changed all request entrances and exits to https. As a result, Alipay payment could not receive callbacks. According to the official Alipay documentation, it is required that "the root certificate is built into the trusted root certificate store of JDK 1.6 by default." I don't quite understand. What is the specific operation to receive the callback? Are there any technical experts who have dealt with related issues? urgent. . Now temporarily changed to http