Virtual Concierge Service

I intend t start a yearly subscription based virtual concierge service. Need a mobile app where customers can register, pay subscription online, raise service requests. Request gets assigned to available associate, associate decides the activities and cost involved., customer accepts, request is accepted, worked upon(outside the app), associate intimates completion to customer, customer closes request. Monthly invoicing for customers. A wallet is required too for customers to pay for service/subscription.