Accounting and Billing Web Portal

We are a tax consultant and services provider company. Which now wants to provide its services to its customers through web portal. Along with information about our services on this web portal, there should also be a billing & accounting system, where clients can upload and send their purchase and sale, inventory management, bank statements and other details related to business. Also we should get that data directly. So that we can do their work at the right time and in the right way. To do this, the subscriber will receive a login immediately after purchasing the service. Clients can do all these things from one place on desktop or mobile.