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I succeed to make Apple Signin working in my company SSO developed on a spring boot stack.Main problems:No icon customization. It must be linked to a deployed native application.Apple Signin Callback is a post method. We have a cookie with samesite=lax. So the session is lost. We don't remember the state value or the redirecturi. My workaround was to create another cookie withe samesite=none and a short TTL, only for the apple-signin.Spring Oauth server doesn't support post method callbackSpring social does not support id_token.I have forked the spring social project to adapt. So the maintenance will be more complex and will take more times to follow spring social updates,I guess many sites will let samesite=none and the security will be globaly bad for the end user (the best is the enemy of the good).