diff --git a/src/Service/RiderAPIHandler/CMBRiderAPIHandler.php b/src/Service/RiderAPIHandler/CMBRiderAPIHandler.php
index 6f4c6ddb..a14ff160 100644
--- a/src/Service/RiderAPIHandler/CMBRiderAPIHandler.php
+++ b/src/Service/RiderAPIHandler/CMBRiderAPIHandler.php
@@ -978,17 +978,17 @@ class CMBRiderAPIHandler implements RiderAPIHandlerInterface
         $this->debugRequest($req);
 
         // allow rider to change service, promo, battery and trade-in options
-        $required_params = ['jo_id', 'stype_id', 'promo_id'];
+        $required_params = ['jo_id', 'service_type', 'promo_id'];
         $data = $this->checkJO($req, $required_params, $jo);
         if (isset($data['error']))
             return $data;
 
         // check service type
-        $stype_id = $req->request->get('stype_id');
-        if (!ServiceType::validate($stype_id)) 
+        $service_type = $req->request->get('service_type');
+        if (!ServiceType::validate($service_type)) 
         {
             $data = [
-                'error' => 'Invalid service type - ' . $stype_id
+                'error' => 'Invalid service type - ' . $service_type
             ];
             return $data;
         }
@@ -1061,7 +1061,7 @@ class CMBRiderAPIHandler implements RiderAPIHandlerInterface
 
         // generate new invoice
         $crit = new InvoiceCriteria();
-        $crit->setServiceType($stype_id);
+        $crit->setServiceType($service_type);
         $crit->setCustomerVehicle($cv);
         $crit->setHasCoolant($jo->hasCoolant());
 
@@ -1082,7 +1082,7 @@ class CMBRiderAPIHandler implements RiderAPIHandlerInterface
         $this->em->flush();
 
         // save job order
-        $jo->setServiceType($stype_id);
+        $jo->setServiceType($service_type);
 
         // save invoice
         $jo->setInvoice($invoice);