Add a product and alter the variations of the product

AddProductWithVariantData.cs

var productResource = new Mozu.Api.Resources.Commerce.Catalog.Admin.ProductResource(_apiContext);
var productVariantResource = new Mozu.Api.Resources.Commerce.Catalog.Admin.Products.ProductVariationResource(_apiContext);
var product = new Mozu.Api.Contracts.ProductAdmin.Product()
{
    Content = new ProductLocalizedContent()
    {
        ProductName = "Generated Product with variants",
    },
    ProductCode = "GEN-WITH-VARS-1",
    Price = new ProductPrice() 
    {
        Price = 12m
    },
    HasConfigurableOptions = true,
    FulfillmentTypesSupported = new List<string>()
    {
        "DirectShip"
    },
    IsTaxable = true,
    PackageHeight = new Mozu.Api.Contracts.Core.Measurement()
    {
        Unit = "in",
        Value = 25
    },
    PackageLength = new Mozu.Api.Contracts.Core.Measurement()
    {
        Unit = "in",
        Value = 25
    },
    PackageWidth = new Mozu.Api.Contracts.Core.Measurement()
    {
        Unit = "in",
        Value = 25
    },
    PackageWeight = new Mozu.Api.Contracts.Core.Measurement()
    {
        Unit = "lbs",
        Value = 10
    },
    InventoryInfo = new ProductInventoryInfo()
    {
        ManageStock = true,
        OutOfStockBehavior = "DisplayMessage"
    },
    ProductUsage = "Configurable",
    Options = new List<ProductOption>()
    {
        new ProductOption() 
        {
            AttributeFQN = "tenant~size",
            Values = new List<ProductOptionValue>()
            {
                new ProductOptionValue()
                {
                    AttributeVocabularyValueDetail = new AttributeVocabularyValue()
                    {
                        Value = "L",
                    },
                    Value = "L"
                },
                new ProductOptionValue()
                {
                    AttributeVocabularyValueDetail = new AttributeVocabularyValue()
                    {
                        Value = "M",
                    },
                    Value = "M"
                }
            }
        }
    },
    ProductTypeId = 3
};

var addedProduct = productResource.AddProductAsync(product).Result;
var productVariationCollection = new Mozu.Api.Contracts.ProductAdmin.ProductVariationCollection()
{
    Items = new List<ProductVariation>() 
    { 
        new ProductVariation() 
        {
            IsActive = true,
            VariationProductCode = "GEN-WITH-VARS-1-L",
            Options = new List<ProductVariationOption>()
            {
                new ProductVariationOption()
                {
                    AttributeFQN = "Tenant~size",
                    Value = "L"
                }
            }
        },
        new ProductVariation() 
        {
            IsActive = true,
            VariationProductCode = "GEN-WITH-VARS-1-M",
            Options = new List<ProductVariationOption>()
            {
                new ProductVariationOption()
                {
                    AttributeFQN = "Tenant~size",
                    Value = "M"
                }
            }
        }
    }
};

var returnedVariants = productVariantResource.UpdateProductVariationsAsync(productVariationCollection, "GEN-WITH-VARS-1").Result;