question

You can use API GetStoreItems to get the item’s info for a specific store. But it is not include the DisplayName, you may need to call API GetCatalogItems to get the DisplayName. Or you can add the DiaplayerName to the store item’s CustomData. Usually, it is recommended to locally cache catalog items for future reference. With code below you can get item’s ItemId, DiaplayName and prices, then you can use it to implement UI in the game.

public Dictionary<string, CatalogItem> Map = new Dictionary<string, CatalogItem>();

void Start()
{
    PlayFabClientAPI.LoginWithCustomID(new LoginWithCustomIDRequest
    {
        CustomId = "Gosen"
    },
    result => {
        GetCatalogItems();
    },
    error => { 
        Debug.Log(error.GenerateErrorReport());
    });
}

public void GetCatalogItems()
{
    PlayFabClientAPI.GetCatalogItems(new GetCatalogItemsRequest
    {
        CatalogVersion = "Main"
    },
    result => {
        foreach (CatalogItem item in result.Catalog)
        {
            Map.Add(item.ItemId, item);
        }
        GetStoreItems();
    },
    error => {
        Debug.Log(error.GenerateErrorReport());
    });
}

public void GetStoreItems()
{
    PlayFabClientAPI.GetStoreItems(new GetStoreItemsRequest
    {
        StoreId = "TestStore",

    },
    result => {
        foreach (var item in result.Store)
        {
            Debug.Log("ItemId:" + item.ItemId);
            Debug.Log("VirtualCurrencyPrices:" + item.VirtualCurrencyPrices["GC"]);
            Debug.Log("DisplayName:" + Map[item.ItemId].DisplayName);
        }
    },
    error => {
        Debug.Log(error.GenerateErrorReport());
    });
}