Fix bug with advance order setting wrong variable #405

src/Controller/APIController.php

@@ -2379,7 +2379,7 @@ class APIController extends Controller implements LoggedController
             ->setDeliveryInstructions($instructions)
             // TODO: error check for valid mode of payment
             ->setModeOfPayment($req->request->get('mode_of_payment'))
-            ->setAdvanceOrder($advance_order);
+            ->setAdvanceOrder($flag_advance_order);
 
         // customer
         $cust = $this->session->getCustomer();