Describe how you would design an Order and Cart Page in iOS, including classes, network requests, APIs, and information flow. The user should be able to order an item, see it in the cart, with a limit of 1 per item. Authentication and user details are not required.

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Design an Order and Cart Page in iOS with limit of 1 item per order.

Create classes for Order, Cart, Item
Implement network requests to fetch item details
Use APIs to add item to cart and place order
Design information flow from selecting item to placing order