Delta-v/Content.Shared/_DV/VendingMachines/ShopVendorUI.cs

using Robust.Shared.Serialization;

namespace Content.Shared._DV.VendingMachines;

[Serializable, NetSerializable]
public sealed class ShopVendorPurchaseMessage(int index) : BoundUserInterfaceMessage
{
    public readonly int Index = index;
}