This post is an update to my previous post on this topic which covers the concepts and approach however Sitecore JSS/Headless has had some significant changes for Sitecore 10.3.X and XM Cloud to enable new capabilities so I wanted to include the steps to achieve this in the new world.
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If you've started delving into the world of Composable SaaS in recent times, you may have encountered a common issue when it comes to security and the typical existing Security Posture businesses have which doesn't quite align to the way in which Composable SaaS architectures need to work.