AddCustomer handles adding a new customer.

AddOrder handles adding a new order.

DeleteCustomer handles deleting an existing customer.

DeleteOrder handles deleting an existing order.

GetCustomerDetail handles logic of getting a single customer.

GetCustomers handles paginated list of customers.

GetOrderDetail handles logic of getting a single order.

GetOrders handles paginated list of orders.

Login handles login request.

register handles register request.

UpdateCustomer handles updating an existing customer.

UpdateOrder handles updating an existing order.