PAYBACK CARTEL — Automation of subscriptions and crypto-payments

The project is designed for the complete automation of info-businesses, closed clubs, and online courses in Telegram. The system takes over routine tasks related to community administration, payment processing, and client database management.

Key functionality:
Access automation: Integration with the Telegram API for generating one-time invitation links and automatically removing users after the subscription ends.
Crypto-acquiring: Accepting payments through the NOWPayments API (BTC, ETH, USDT, etc.) with automatic calculation of network fees at the buyer's expense.
Smart deadline control: Daily notifications about access expiration (5 days in advance), providing a grace period (Grace Period — 5 days), and automatic kick on the 6th day at 00:01.
CRM synchronization: Two-way integration with Airtable for convenient monitoring of users, payment dates, statuses, and email addresses.
Admin panel: Built-in tools for newsletters, user management, and collecting daily analytics.
Technology stack: Node.js, MongoDB (Mongoose), Telegraf.js, Airtable API, NOWPayments API, Node-cron.