Extension.cs

public static class Extensions
{
    public static bool IsDownloadable(this OfferingType offeringType)
    {
        var validOfferings = new List<OfferingType>()
        {
            OfferingType.Template,
            OfferingType.Ebook,
            OfferingType.OfflineCourse
        };

        return validOfferings.Contains(offeringType);
    }
}

public sealed class ProductHandler(ResourcesHelper resourcesHelper)
{
    public void DoStuff(Product product)
    {
        if (product.Type.IsDownloadable())
        {
            var fileName = resourcesHelper.GetDefaultDownloadFileName(product.Type);
            var downloadUrl = resourcesHelper.GetDownloadUrl(product.Type);
        }

    }
}