Core/Packet Update structure (new format) for somes Items Opcode

public class PlayerCliBuyItem
{
    public ulong VendorGUID    { get; set; }
    public ItemInstance Item   { get; set; }
    public uint Muid           { get; set; }
    public uint Slot           { get; set; }
    public byte ItemType       { get; set; }
    public int Quantity        { get; set; }
    public ulong ContainerGUID { get; set; }
}