Telegram Shopping Bot Automation

I want a Telegram bot that fully automates responses for a shopping flow. The bot must behave as an interactive store assistant inside any chat, guiding customers from their first query all the way through secure checkout without human intervention.

Key features I need delivered:
• Product search & smart recommendations based on user keywords or menu browsing
• Seamless order placement, capturing quantity, variations, and delivery details inside the chat
• Integrated payment processing so buyers can pay and receive instant confirmation right in Telegram

Please build on the official Telegram Bot API and choose any reliable payment gateway that works globally and keeps PCI-compliant data off my server. The final hand-off has to include: well-commented source code, a brief setup guide for hosting/deployment, and a short user manual I can forward to my team.

Acceptance will be based on a live demo bot where I can:
1. send /start, see a welcome message, and browse or search products;
2. add an item to cart and change quantities;
3. complete checkout and receive an in-chat receipt;
4. view the corresponding order in the admin panel or database.

If anything is unclear about catalogs, APIs, or payment credentials, just let me know early so we can keep the build smooth and focused.