Integrate GPay UPI for PHP CodeIgniter

I need a freelancer to integrate GPay UPI for one-time payments on my PHP CodeIgniter website. The integration should not save any user payment information as I prefer to keep transactions strictly one-off.

Key Requirements:
- Integration of GPay UPI for one-time payments
- No saving of user payment information
- Implementation of email notifications for successful payments
- On-screen confirmations for payment success

Skills Needed:
- PHP CodeIgniter
- Payment Gateway Integration
- Email Notification System Implementation
- UI/UX for On-screen Confirmations

Please note, I want a simple, clean and efficient integration that prioritizes user experience and seamless transaction process.