Simple iOS Master/Detail application that interacts with JSON webservice using RestKit

I need an iOS application that uses RestKit to interact with a webservices/JSON API to display a list of invoices, allows an invoice to be selected to display detail information about the invoice, and allows new invoice line items to be added to the invoice. The API is very straightforward. Details will be provided on request. The application should have a Settings pane in the iOS Settings application that allow the following configuration settings to be set: 1. Base URL (this is a multitenant web service, so the URL needs to be set) 2. Username 3. Password On launch, the application needs to call the API and provide the username and password to login. On successful login, a SID is provided which is then sent with all other calls to the API. The detail view for each invoice will include at least the following: Client Name Off-shelf and Restock times (date-time fields) A list of items currently on the invoice. Each line item has a name, a quantity, a unit price, and a line item price. The list of items should be a table view. The detail view needs to have two more table views. One is for a category listing of item types, and one is for a listing of items that are available to be added to the invoice. The item types table view is just a simple list of names. The available items list changes based on the selected item type. It contains three columns (a thumbnail image, item name, and quantity available). The application should implement drag and drop so that an item can be dragged from the available inventory table onto the table that shows the current line items. When the item is dropped another call is made to the API to actually add the item to the invoice. Additional details will be provided on request. --TWH