We have proposed them all services where we made their application, run SMS campaign to all customers to let them know about our application. We are also managing their offer designing, running SMS campaign on weekly basis when required, providing them ideas for making offer, adding features in their app.
We added a feature where customer can select products, add instruction in instruction box, if product is not available in list then add that product in instruction box. Admin can see daily orders, update them. When order is ready, customer will get notification of their order along with final order.