Python E-Commerce Stock & Price Monitor Telegram Bot

I need a single, well-structured Python script that keeps an eye on several Indian e-commerce stores and immediately pings my Telegram when something changes.

Websites to watch
• Amazon
• Flipkart
• Croma
• Reliance Digital
• Vijay Sales
• Samsung Store
• Blinkit
• Zepto
• Flipkart Minutes
• Swiggy Instamart

Key metrics to track
• Stock availability
• Price changes
• Discounts, coupons, flash sales, bank / EMI / exchange offers
• Pin-code-level delivery availability

Create a single Python script that automatically monitors multiple products across Amazon, Flipkart, Croma, Reliance Digital, Vijay Sales, Samsung, Apple, and other e-commerce websites for stock availability, price changes, discounts, coupons, bank/EMI/exchange offers and flash sales, stores previous data locally for change detection, continuously rechecks products at configurable intervals, and instantly sends alerts through a normal Telegram account using Telethon/Pyrogram without creating a Telegram bot.