Need some firebase customization and Payu Payment integration in my JAVA Android app

Hi, I'm creating an esports app. I need help with some firebase stuffs and need Payu Payment integration done. The code is written in JAVA and you need to work remotely with TeamViewer. The things you need to do/fix,

- When new user joins I should get an email.
- Build me an admin panel
- Separately show past tournaments and upcoming tournaments as per timestamp
- Show which tournaments user joined in My Tournaments section
- Show the wallet history
- Payu Payment Integration
- Fix the join button and make paticipant count

Fix if there's any other minor bugs. Apply only if you are able to these things perfectly in this budget. Thank you