AppleAuthentication Validate authorizationCode

Reading the documentation hereseems to indicate that you can just use the original JWT from theAppleAuthentication.signInAsync(options)as long as you checkAppleAuthentication.getCredentialStateAsync(user)each time, leading one to believe there isn't a need for any server side implementation. The only information I've been able to find in the forums was about how to validate the JWT. Unfortunately it seems the process is a fair bit more complex than that, as you really need to be able to make a call to the Apple auth endpoint using theauthorizationCode` supplied in the original login request. That requires a signed JWT that is registered to the app. Is there a way to do this in an Expo hosted app? Presumably I’ll need to create the server side of things to make this work for a standalone app but I’d like to do some testing in Expo first and I don’t see how to do this.