Convert order to invoice, book customer invoice

src/Models/CustomerInvoice.php

@@ -14,6 +14,16 @@
 class CustomerInvoice extends Model
 {
 
-    protected $entity     = 'customer-invoices';
+    protected $entity = 'customer-invoices';
     protected $primaryKey = 'number';
+
+    public function book()
+    {
+        return $this->request->handleWithExceptions(function () {
+
+            return $this->request->client->post("{$this->entity}/{$this->{$this->primaryKey}}/book")
+                ->getBody()
+                ->getContents();
+        });
+    }
 }

src/Models/Order.php

@@ -9,6 +9,7 @@
 namespace Rackbeat\Models;
 
 
+use Rackbeat\Builders\CustomerInvoiceBuilder;
 use Rackbeat\Builders\OrderShipmentBuilder;
 use Rackbeat\Utils\Model;
 
@@ -58,4 +59,23 @@ public function shipments()
             ]);
         });
     }
+
+    /**
+     * @param bool $book Should the invoice be booked
+     * @return CustomerInvoice
+     * @throws \Rackbeat\Exceptions\RackbeatClientException
+     * @throws \Rackbeat\Exceptions\RackbeatRequestException
+     */
+    public function convertToInvoice($book = false)
+    {
+        return $this->request->handleWithExceptions(function () use ($book) {
+
+            $response = json_decode((string)$this->request->client->post("{$this->entity}/{$this->{$this->primaryKey}}/convert-to-invoice?bbok={$book}")
+                ->getBody());
+
+            $invoice = (new CustomerInvoiceBuilder($this->request))->find($response->invoice_id);
+
+            return $invoice;
+        });
+    }
 }