Add order termination logic

uncloud_pay/views.py

@@ -313,3 +313,15 @@ class AdminOrderViewSet(mixins.ListModelMixin,
 
     def get_queryset(self):
         return Order.objects.all()
+
+    @action(detail=True, methods=['post'])
+    def terminate(self, request, pk):
+        order = self.get_object()
+        if order.is_terminated:
+            return Response(
+                    {'error': 'Order is already terminated.'},
+                    status=status.HTTP_500_INTERNAL_SERVER_ERROR)
+
+        else:
+            order.terminate()
+            return Response({}, status=status.HTTP_200_OK)