public static void Shop_AddProductMetafield(string StoreName, string APIKey, string Password, long ProductID, string JsonString, out SqlInt64 MetafieldID) { ShopifyClient sp = new ShopifyClient(StoreName, APIKey, Password); MetafieldID = sp.AddProductMetafield(ProductID, JsonString); if (!String.IsNullOrEmpty(sp.ErrMsg)) RaiseErr(sp.ErrMsg); }