How to avoid reverse engineering of an APK file?

Question

I am developing a payment processing app for Android, and I want to prevent a hacker from accessing any resources, assets or source code from the APK file.<

Answer 1

I knew some banking apps are using DexGuard which provides obfuscation as well as encryption of classes, strings, assets, resource files and native libraries

https://www.guardsquare.com/en/products/dexguard