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Telegram Premium Sync - Implementation Summary

What's New ✨

When a user links their Telegram account in the HollowScan mobile app, the system now automatically detects if they're a premium user on the Telegram bot and upgrades their app subscription accordingly.

How It Works in 5 Steps

1. User goes to Profile → Integrations → Telegram Bot
2. Clicks button to open HollowScan Telegram bot
3. Starts bot with /start (gets their chat ID)
4. Enters chat ID + username in app and clicks "Link Account"
5. App checks if they're premium on Telegram bot and syncs status

Result:

  • ✅ If premium on Telegram → Automatically unlocked as premium in app
  • ✅ If not premium on Telegram → Account linked for notifications only
  • ✅ Premium expiry date shown in app

Changes Made

Backend (main_api.py)

New Endpoint: POST /v1/user/telegram/link

  • Accepts: user_id, telegram_chat_id (integer)
  • Checks: data/bot_users.json for user premium status
  • Verifies: If expiry date is in the future
  • Updates: User's subscription_status to "active" if premium
  • Returns: Success message with premium status and expiry date

Frontend (ProfileScreen.js)

New State Variables:

  • telegramChatId - Telegram numeric ID
  • isPremium - Whether user is premium
  • premiumUntil - Premium expiry date
  • userId - Current user ID

Updated Handler (handleTelegramLink):

  • Calls new backend endpoint
  • Sets isPremium state if premium status received
  • Shows special alert message if premium
  • Displays premium badge in Integrations section

UI Updates:

  • Modal now asks for Chat ID (numeric) + Username
  • Success state shows premium info if applicable
  • Integrations section displays premium expiry date
  • Premium badge shows: 👑 Premium until 12/31/2026

Data Flow

User enters chat ID + username
         ↓
App calls: POST /v1/user/telegram/link?user_id=...&telegram_chat_id=...
         ↓
Backend loads: data/bot_users.json
         ↓
Backend finds user by chat_id_str: telegram_users[str(chat_id)]
         ↓
Backend checks: If user_data['expiry'] > now()
         ↓
If premium:
  ├─ Update DB: subscription_status = "active"
  └─ Return: is_premium=true, premium_until="2026-12-31..."
  
If not premium:
  └─ Return: is_premium=false, note="No premium found"
         ↓
Frontend updates state and displays result

User Experience

Before Linking

📱 Telegram Bot          [Not linked]
Connect for alerts

After Linking (Not Premium)

📱 Telegram Bot          [✓ Linked]
Receiving notifications

After Linking (Premium on Telegram Bot)

📱 Telegram Bot          [✓ Linked]
👑 Premium until 12/31/2026

Modal shows:
✅ Telegram connected!

👑 Premium Status Synced!
Premium until: 12/31/2026
All premium features are now available on this app.

Key Benefits

✅ One-Click Premium Sync - No separate purchases needed
✅ No Double Billing - Uses existing Telegram subscription
✅ Clear Status - Shows premium expiry date
✅ Automatic Detection - Checks Telegram bot data when linking
✅ Graceful Fallback - Works if premium data not found

Files Modified

  1. main_api.py

    • Added POST /v1/user/telegram/link endpoint
    • ~60 lines of premium detection and sync logic

  2. ProfileScreen.js

    • Updated state management (3 new state variables)
    • Updated handleTelegramLink() handler
    • Updated modal to ask for chat ID
    • Updated Integrations section UI
    • Added premium status display in modal

  3. TELEGRAM_PREMIUM_SYNC.md (new)

    • Complete technical documentation

Testing the Feature

Manual Testing:

  1. Start Telegram bot locally
  2. Send /start to get your chat ID
  3. In app, go to Profile → Integrations → Telegram Bot
  4. Enter chat ID and username
  5. Click "Link Account"
  6. Verify:
    • ✓ Backend finds your user data
    • ✓ Premium status is checked
    • ✓ Success message shows correct status
    • ✓ Integrations section updates

With Premium User:

  1. Ensure your Telegram user has future expiry date
  2. Link account in app
  3. Verify: "Premium until [date]" displays
  4. Verify: App subscription_status is set to "active"

Important Notes

⚠️ Requirements:

  • data/bot_users.json must exist (created by telegram_bot.py)
  • User must be in bot_users.json with valid expiry field
  • Telegram chat ID must match the key in bot_users.json
  • App user must exist in database before linking

⚠️ Configuration:

  • Bot link is hardcoded to t.me/HollowscanBot - update if different
  • User ID is currently hardcoded to 'user-1' - should come from auth context
  • API base URL uses Constants.API_BASE_URL - ensure it's set correctly

Next Steps

  1. ✅ Backend endpoint implemented
  2. ✅ Frontend state and handlers updated
  3. ✅ UI updated to show premium status
  4. 📋 Test with real Telegram users
  5. 📋 Connect to actual auth context for user_id
  6. 📋 Add webhook to auto-sync when Telegram premium updates
  7. 📋 Show locked/unlocked premium features based on status

API Reference

POST /v1/user/telegram/link

Request:

POST /v1/user/telegram/link?user_id=user-123&telegram_chat_id=987654321

Response (Premium):

{
  "success": true,
  "message": "Telegram account linked and premium status synced!",
  "is_premium": true,
  "premium_until": "2026-12-31T23:59:59Z",
  "telegram_chat_id": 987654321
}

Response (Not Premium):

{
  "success": true,
  "message": "Telegram account linked successfully",
  "is_premium": false,
  "premium_until": null,
  "telegram_chat_id": 987654321,
  "note": "No active premium found on Telegram bot"
}

Summary

The Telegram Premium Sync feature is now fully implemented. When users link their Telegram account, the app automatically checks if they're premium on the Telegram bot and upgrades their app subscription if they are. This creates a seamless experience where users don't need to manage subscriptions separately across platforms.