Added code example for creating an order via code

Author: mattbrailsford

15/umbraco-commerce/how-to-guides/create-order-via-code.md

@@ -2,4 +2,61 @@
 description: Learn how to create an order via code in Umbraco Commerce.
 ---
 
-# Create an Order via Code
+# Create an Order via Code
+
+It is sometimes necessary, such as when importing orders from another system, to create a fully finalized order via code. 
+
+An example of the code to do this is shown below. Here the `api` variable is an instance of the `IUmbracoCommerceApi` interface, which is an injectable service you access via [dependency injection](../key-concepts/dependency-injection.md).
+
+```csharp
+await api.Uow.ExecuteAsync(async (uow) =>
+{
+    // Fetch the store
+    var store = await api.GetStoreAsync("blendid");
+    
+    // Create or get the current order
+    var order = await api.GetOrCreateCurrentOrderAsync(store.Id).AsWritableAsync(uow);
+
+    // Add product
+    var productId = "2fa949e4-2acb-4aef-bb7c-4d3a5f7bbe52"; // The product node Key
+    await order.AddProductAsync(productId, null, 1);
+
+    // Set customer details
+    var country = await api.GetCountryAsync(store.Id, "GB");
+    await order.SetPropertiesAsync(new Dictionary<string, string>
+        {
+            { Constants.Properties.Customer.EmailPropertyAlias, $"[email protected]" },
+            { "marketingOptIn", "0" },
+            { Constants.Properties.Customer.FirstNamePropertyAlias, "Example" },
+            { Constants.Properties.Customer.LastNamePropertyAlias, $"Customer" },
+            { "billingAddressLine1", "10 Example Road" },
+            { "billingCity", "Example City" },
+            { "billingZipCode", "EX3 3PL" },
+            { "billingTelephone", "0123456789" },
+            { "shippingSameAsBilling", "1" }
+        })
+        .SetPaymentCountryRegionAsync(country, null)
+        .SetShippingCountryRegionAsync(country, null);
+
+    // Set shipping method
+    var shippingMethod = await api.GetShippingMethodAsync(store.Id, "pickup");
+    await order.SetShippingMethodAsync(shippingMethod);
+
+    // Set payment method
+    var paymentMethod = await api.GetPaymentMethodAsync(store.Id, "invoicing");
+    await order.SetPaymentMethodAsync(paymentMethod);
+
+    // Recalculate order
+    await order.RecalculateAsync();
+
+    // Finalize order
+    await order.InitializeTransactionAsync();
+    await order.FinalizeAsync(order.TransactionAmount.Value, Guid.NewGuid().ToString("N"), PaymentStatus.Authorized);
+
+    // Save order
+    await api.SaveOrderAsync(order);
+
+    // Commit the unit of work
+    uow.Complete();
+});
+```