I need an Android app. I would like it designed and built. We need an app where clients and sellers can contact and the user can manage and track their [url removed, login to view] can send promotional vouchers to specific users or these can be put on displayed on maun page. Conversations usually follow standard format with some mandatory information fields. Payment gateway needed. Android, iPhone iPad support needed. Customers can register using FB, Google account, can upgrade to premium service package. Sellers need confirmation by admin and can choose subscription package. Features become are available based on package chosen. Admin user required.