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Thinking out of the box, can’t you use something like REST Assured in the post serve action to make the call? And then either ignore the certificate using RelaxedHttpsValidation() or use something like this: https://www.javadoc.io/doc/io.rest-assured/rest-assured/latest/io/restassured/config/SSLConfig.html

So, in place of the postserveaction in the json stub file, I would put a rest Assured call? Is there documentation on how to do this?

No, as I said 'thinking out of the box' 🙂 If you need some help with Rest Assured I think I'll be able to do that (although I've never set up a keystore). You don't put the Rest Assured call in the JSON stub file, you put it in the definition of your custom extension that extends the PostServeAction