VCST-2092: add configurable product

src/VirtoCommerce.CatalogModule.Core/Model/CatalogProduct.cs

@@ -97,6 +97,11 @@ public class CatalogProduct : AuditableEntity, IHasLinks, ISeoSupport, IHasOutli
         /// </summary>
         public bool? TrackInventory { get; set; }
 
+        /// <summary>
+        /// Indicates configurable product.
+        /// </summary>
+        public bool IsConfigurable { get; set; }
+
         /// <summary>
         /// The date and time when the product was last indexed for search.
         /// </summary>

src/VirtoCommerce.CatalogModule.Core/Model/ProductConfiguration.cs

@@ -0,0 +1,8 @@
+using System.Collections.Generic;
+
+namespace VirtoCommerce.CatalogModule.Core.Model;
+
+public class ProductConfiguration
+{
+    public IList<ProductConfigurationSection> ConfigurationSections { get; set; } = [];
+}

src/VirtoCommerce.CatalogModule.Core/Model/ProductConfigurationSection.cs

@@ -0,0 +1,22 @@
+using System.Collections.Generic;
+
+namespace VirtoCommerce.CatalogModule.Core.Model;
+
+public class ProductConfigurationSection
+{
+    public string Id { get; set; }
+    public string Name { get; set; }
+    public string Type { get; set; }
+    public string Description { get; set; }
+    public bool IsRequired { get; set; }
+    public int DisplayOrder { get; set; }
+
+    public IList<ProductConfigurationOption> Options { get; set; } = [];
+}
+
+public class ProductConfigurationOption
+{
+    public string Id { get; set; }
+    public string ProductId { get; set; }
+    public int Quantity { get; set; } = 1;
+}

src/VirtoCommerce.CatalogModule.Core/Services/IConfigurableProductService.cs

@@ -0,0 +1,8 @@
+using System.Threading.Tasks;
+using VirtoCommerce.CatalogModule.Core.Model;
+
+namespace VirtoCommerce.CatalogModule.Core.Services;
+public interface IConfigurableProductService
+{
+    Task<ProductConfiguration> GetProductConfigurationAsync(string productId);
+}