Ice Cream shop no event sourcing

public class Customer 
{
    public decimal AccountBalance { get; set; }
    public List<Orders> Orders { get; set; }
    public string Name { get; set; }
    
    public void AddMoney(decimal amountToAdd)
    {
        AccountBalance += amountToAdd
    }
    
    public void PlaceOrder(string iceCreamFlavor, decimal price) 
    {
        if (AccountBalance >= price)
        {
            AccountBalance-=price;
            Orders.Add(new Order { Flavor = iceCreamFlavor });
            return;
        }
        
        throw new InsufficientFundsException();
    }
}

public class Order
{
    public string Flavor { get; set; }
}