diff --git a/alkatorapi/views.py b/alkatorapi/views.py
index b2b7154..48465f2 100644
--- a/alkatorapi/views.py
+++ b/alkatorapi/views.py
@@ -9,7 +9,7 @@ import PIL.Image
 import random
 
 from .models import User, ALKATOR_CHOICES_DICT
-from alkator.settings import COMGATE_MERCHANT, COMGATE_SECRET
+from alkator.settings import COMGATE_MERCHANT, COMGATE_SECRET, COMGATE_TEST
 
 
 @csrf_exempt
@@ -51,6 +51,7 @@ def register(request):
 
     payment_data = {
         'merchant': COMGATE_MERCHANT,
+        'test': 'true' if COMGATE_TEST else 'false',
         'price': 69000,
         'curr': 'CZK',
         'method': 'ALL',
@@ -59,7 +60,7 @@ def register(request):
         'fullName': f"{request.POST['first_name']} {request.POST['last_name']}",
         'refId': f'{user.id}',
         'secret': COMGATE_SECRET,
-        'prepareOnly': True,
+        'prepareOnly': 'true',
     }
     result = requests.post('https://payments.comgate.cz/v1.0/create', data=payment_data)