Source Coder is an android studio Project source code downloading app. Google Play Billing In app subscription java and Kotlin in app purchases java and Kotlin Multiple Subscription Single Subscription Firebase database OTP IN android studio Bluetooth permission grid view. spinner blue tooth printer firebase auth Biometric Authentication Kotlin Bottom Sheet Kotlin Check Network Network Connectivity Using Live data. custom alert dialog Kotlin Custom Dialog Kotlin Tab Layout Kotlin Notification Kotlin Banner Ads Kotlin Interstitial Ad Kotlin Rewarded Interstitial Ad Kotlin Speech To Text Kotlin Text To Speech Kotlin MySQL database Jdbc Java Connectivity SQL Server database Jdbc Java Connectivity