Weekly Subscription & UI Enhancements

I already have a fully published app on both Android and iOS, built with a solid code-base that is running well in production. What I now need is an update that introduces a WEEKLY subscription using the... (Budget: ₹600 - ₹1500 INR, Jobs: Android, Flutter, Graphic Design, iOS, Mobile Development, UI / User Interface, User Interface / IA, Visual Design, Website Design)