KidsGuard Pro Premium Integration

I hold full rights to the KidsGuard Pro code-base and now need an Android specialist to enable its premium feature set through 100 % legal subscription flows. The goal is to move completely away from any “mod” or cracked builds and rely only on authorised purchase paths.

What I need from you
• Build or refactor the current APK so that premium options appear only after the user buys an approved subscription.
• Implement the subscription logic exactly as defined in the back-end dashboard (I will provide keys, endpoints, and UI copy).
• Make sure entitlement is stored securely and survives reinstall or device change.
• Provide a short document explaining how to generate future signed builds with the same subscription hooks.

Acceptance criteria
1. Fresh install shows free tier until purchase is completed.
2. After purchase, all premium screens and tracking tools unlock automatically.
3. Cancelling the subscription reverts the user to the free tier on the next billing cycle.
4. APK passes Play Console pre-launch checks with no policy warnings.

You will receive the existing source, design assets, and access tokens once we agree to start. Preference for developers in India or Nepal for quick communication and easy payment, but anyone experienced with Google Play Billing Library (current version) and secure licensing is welcome to bid.