Building secure B2C applications with fine-grained access control using Amazon Cognito and Amazon Verified Permissions

This AWS technical guide explains how to implement robust authentication (Amazon Cognito) and fine‑grained authorization (Amazon Verified Permissions with Cedar policies) for a Streamlit application. It provides an architecture overview, step‑by‑step workflow, example Cedar policies (resource ownership, role‑based access, hierarchical controls, emergency admin override), policy evaluation rules, deployment/prerequisite steps, and security best practices for deploying and monitoring the solution.