diff --git a/indico/modules/events/registration/controllers/api/test_snapshots/checkin_registration_details.yml b/indico/modules/events/registration/controllers/api/test_snapshots/checkin_registration_details.yml
index 0a36e2ab16d..26a11947ea0 100644
--- a/indico/modules/events/registration/controllers/api/test_snapshots/checkin_registration_details.yml
+++ b/indico/modules/events/registration/controllers/api/test_snapshots/checkin_registration_details.yml
@@ -9,6 +9,7 @@ full_name: Guinea Pig
 id: <id>
 is_paid: false
 occupied_slots: 1
+payment_date: null
 price: 0
 regform_id: <id>
 registration_data:
diff --git a/indico/modules/events/registration/controllers/api/test_snapshots/checkin_registrations.yml b/indico/modules/events/registration/controllers/api/test_snapshots/checkin_registrations.yml
index 0504f906c6a..eeb68911284 100644
--- a/indico/modules/events/registration/controllers/api/test_snapshots/checkin_registrations.yml
+++ b/indico/modules/events/registration/controllers/api/test_snapshots/checkin_registrations.yml
@@ -9,6 +9,7 @@
   id: <id>
   is_paid: false
   occupied_slots: 1
+  payment_date: null
   price: 0
   regform_id: <id>
   registration_date: <timestamp>