API-Integrated Telegram Bot Development

I'm looking for a skilled developer to create a Telegram bot with the following capabilities:

- Primary Function: Automated replies, information retrieval, and user management.
- API Integration: Must integrate with database services and payment gateways.

Ideal skills and experience:
- Proficiency in Telegram bot development.
- Experience with database and payment gateway APIs.
- Strong programming skills, preferably in Python or Node.js.
- Ability to handle automated responses and user queries efficiently.

Please provide examples of similar projects you've completed and your approach to API integration.