Android App Testing and Play Store Release -- 3

I need a professional to conduct functional testing on my Android app. The primary focus is evaluating the app's user authentication, payment processing, and data synchronization functionalities. After testing, I require assistance in releasing the app on the Android Play Store.

Ideal candidates for this project should have:
- Extensive experience in functional testing for Android apps
- Proficient understanding of user authentication, payment processing, and data synchronization testing
- Prior experience with Android Play Store releases

Note: I have not prepared any test cases for the app, so I will need assistance in creating them.