Android E-Commerce App Build

I need a complete e-commerce application developed in Android Studio. The core of the project is straightforward: an intuitive product catalog that I can easily expand, a smooth shopping-cart flow, and a secure payment-gateway integration so customers can check out without friction... (Budget: $10 - $30 USD, Jobs: Android, Android App Development, Android Studio, Java, Kotlin, Mobile App Development, Payment Gateway Integration, Software Architecture)