AddToCartLogHandler.cs

public class AddToCartLogHandler : IPostRequestHandler<AddToCart, Unit>
{
    private readonly ILogger<AddToCart> _logger;

    public AddToCartLogHandler(ILogger<AddToCart> logger)
    {
        _logger = logger;
    }

    public void Handle(AddToCart request, Unit response)
    {
        _logger.LogInformation("Album {albumId} was added to the cart.", request.AlbumId);
    }
}