I have a custom-built HTML/CSS/JS site and a live Facebook App (App ID and secret are ready). What I need now is a clean, secure way to let visitors grant permission through Facebook OAuth and then return basic user details—name, email, profile picture, anything you can legally fetch under the current Graph API permissions. Here’s what success looks like for me: • A small, well-documented JavaScript module (vanilla JS is fine, a lightweight framework like Vue or React is also acceptable) that triggers the login dialog and, on approval, retrieves the agreed-upon fields through Graph API v18 or later. • A callback that hands those fields back to my page so I can use them client-side or forward them to my own backend. • Clear notes on any URL whitelisting, OAuth redirect configuration, and the permissions I must submit for review so Facebook stays happy. • A quick demo page or screencast proving the flow works end-to-end. Keep the implementation tidy, secure, and future-proof—no hard-coding secrets in the front end. If you’ve done similar Graph API work before, that’s a plus.