I Built an OPA Plugin That Turns It Into an AuthZEN-Compatible PDP

Introduction In my previous article, I did a deep dive into the AuthZEN Authorization API 1.0 spec. It standardizes communication between PEPs and PDPs. You send a JSON request asking "can this subject do this action on this resource?" and get back {"decision": true/false}. So the spec makes sense. But how do you actually use OPA as an AuthZEN-compatible PDP? OPA already has a REST API (POST /v1/data/...), but it doesn't match the AuthZEN API. Different path: AuthZEN uses POST /ac