I’m currently working on a web application using the MERN stack (MongoDB, Express.js, React.js, Node.js). I need to implement XACML (eXtensible Access Control Markup Language) for fine-grained access control, and I’m a bit confused about how to integrate all the XACML components (PEP, PIP, PAP, PDP) into my application. I want to know how all the components like MERN and XACML will work together with code examples