Hi, I'm looking for an experienced developer to build a Telegram bot that integrates with MagnusBilling API to allow my VoIP customers to manage their accounts directly from Telegram. Key Features Required: User Authentication /start command asks for MagnusBilling username. Bot verifies username via API and links Telegram ID to the account (one-time verification optional). Account Information /balance – Show current credit/balance and plan name. /account – Show username, plan, available minutes/credit. Recharge / Auto Top-Up /recharge – Show predefined amounts (e.g., $100, $200, $500, custom). User selects amount → Bot generates invoice. Modular code to support 2 providers (switch by API key in config only). On payment confirmation (webhook) → Bot calls MagnusBilling API to create refill/add balance. Send confirmation with updated balance. Plan Change /plans – List available plans (fetch from MagnusBilling or admin-configurable). User selects new plan → Bot checks balance sufficiency → Calls API to change plan (deduct fee if needed). If balance low → Prompt recharge first. Other Commands /history – Last 5 refills/transactions. /cdr – Last 5 calls (basic info). /help – List commands. Inline buttons for main menu. Admin Panel (Simple Web Dashboard) Basic login (admin only). Manage plans list. Configure payment provider API keys. View linked users and logs. Technical Requirements Python preferred (aiogram or python-telegram-bot for async). Clean, modular code (payment providers switchable via config). Webhook setup for payments. Database: SQLite or PostgreSQL (simple user linking/logs). Hosting: Linux VPS (I'll provide – 24/7 run with pm2/systemd). Deliverables Full source code via private GitHub repo (I'll own). Deployment guide + admin panel. Documentation (setup, API keys config, webhook). 14 days support for fixes. Preferred Experience Telegram bots + payment gateway webhooks. API integrations (VoIP billing like MagnusBilling). Please share: Past similar bots (screenshots/links). Fixed price quote. Estimated timeline. Budget: $300 – $600 (depending on quality). Looking forward to your bids! Thanks