A SDK integration inside a Android app made on Java

I want to intregate an SDK to our Android app. our Android app build on JAVA
our SDK link - https://docs.paysprint.in/matm/onboarding/LIVE/finalonboardinglib-release_v1_0_9.aar
Demo Code with SDK - https://pay-sprint.readme.io/reference/onboarding-mobile-sdk
When we run demo code it working fine but when i try to run SDK inside our APP it not working.
Our App Link - https://play.google.com/store/apps/details?id=com.paypocket

Can you do it ?
Also we have backend developer, don't need backend developer