AddCartItem

This is the same as AddCartItemRequest except for no SessionToken. It's used in AddItemsAndCheckoutRequest. If we had used AddCartItemRequest, we'd have required a sessionToken in each Item we convert this to AddCartItemRequest in the controller

Name	Description	Type	Additional information
ItemCode		string	Required
Quantity		integer	Required
PosItemCode		string
Comments		string
Options		Collection of RequestCartItemOption