Developer tasks for using service method
        UpdateStockInformation.
        UpdateStockInformation is used to modify a SKU and associated
            inventory catalog.
At your visual studio solution setup:
 
        - 
                Reference the Sitecore.Commerce.Connect.CommerceServer and Sitecore.Commerce.dll.
            
- 
                Pick the class in your solution where want to use this service method.
            
- 
                Paste in the code below to use the service method. 
                
                    var provider = new CommerceInventoryServiceProvider();
var commerceStockInfo = new CommerceStockInformation
            {
                ProductId = "newSku",
                VariantId = "newSku1",
                ProductCatalogName = ProductCatalogName,
                OnHandQuantity = 15,
                InventoryStatus = CommerceServer.Core.Catalog.StockStatus.Enabled,
                StockOutThreshold = 1
            };
var request = new UpdateStockInformationRequest(string.Empty, commerceStockInfo);
var result = provider.UpdateStockInformation(request);