WordPress Portal With Telegram Alerts

I need a lightweight client-only area added to my existing WordPress site that streams live trade alerts coming from a private Telegram channel. As soon as an alert hits Telegram it must automatically appear in the portal page and trigger a browser / mobile push notification for every approved user.

Core requirements
• Real-time, automatic forwarding of trade alerts from my private Telegram channel into a secure WordPress page.
• Users can (a) view the incoming trade alerts, (b) receive push notifications, and (c) browse a simple archive of past alerts.
• An admin panel—ideally powered by a linked Google Sheet—where I can manually add, approve, suspend, or delete members without ever touching the WordPress back-end. A change in the sheet should sync instantly with the site’s user table.
• The solution must stay lightweight: no bloated membership plugins; clean code or a slim custom plugin is fine.
• Everything has to keep working if I later migrate hosts or theme.

Acceptance criteria
1. I can add a new email address to the Google Sheet, set a status to “Approved,” and that person immediately gains access.
2. When I post “BUY AAPL 150c” in Telegram, the same text appears in the portal within seconds and fires a push notification.
3. Users visiting the portal see a scrollable timeline of current and historical alerts.
4. No unauthorized visitors can view the page or its data.

I’m open to whichever stack—Telegram Bot API, WordPress REST API, webhook middleware, PWA service worker for push, or a tiny custom plugin—so long as the final setup is stable, secure, and easy for me to maintain.