/// <summary>
/// Begins the User Transaction for checking out goods at the grocery kiosk.
/// </summary>
/// <param name="userBasket"> Takes a list of items the user would like to purchase</param>
/// <returns>A user basket with total price and discounts applied.</returns>
public BasketModel BeginTransaction(string[] userBasket)
{
List <ItemModel> kioskItems = _dataStore.GetKioskItems();
List <PromotionModel> kisokPromotions = _dataStore.GetKioskPromotions();
var basket = GroceryKioskHelper.GetItemAndAddOrUpdateBasket(userBasket, kioskItems);
_promotionService.ApplyPromotionsToBasket(basket, kisokPromotions);
return(basket);
}