API: Allow to psas comment when issuing refund

src/pretix/api/views/order.py

@@ -1669,6 +1669,9 @@ class PaymentViewSet(CreateModelMixin, viewsets.ReadOnlyModelViewSet):
         else:
             mark_refunded = request.data.get('mark_canceled', False)
 
+        if not isinstance(request.data.get("comment", ""), str):
+            return Response({'comment': 'Invalid type.'}, status=status.HTTP_400_BAD_REQUEST)
+
         if payment.state != OrderPayment.PAYMENT_STATE_CONFIRMED:
             return Response({'detail': 'Invalid state of payment.'}, status=status.HTTP_400_BAD_REQUEST)
 
@@ -1695,6 +1698,7 @@ class PaymentViewSet(CreateModelMixin, viewsets.ReadOnlyModelViewSet):
             amount=amount,
             provider=payment.provider,
             info='{}',
+            comment=request.data.get("comment"),
         )
         payment.order.log_action('pretix.event.order.refund.created', {
             'local_id': r.local_id,

src/tests/api/test_orders.py

@@ -845,6 +845,7 @@ def test_payment_refund_success(token_client, organizer, event, order, monkeypat
         organizer.slug, event.slug, order.code, p1.local_id
     ), format='json', data={
         'amount': '23.00',
+        'comment': 'Foo',
         'mark_canceled': False,
     })
     assert resp.status_code == 200
@@ -853,6 +854,7 @@ def test_payment_refund_success(token_client, organizer, event, order, monkeypat
         assert r.provider == "stripe"
         assert r.state == OrderRefund.REFUND_STATE_DONE
         assert r.source == OrderRefund.REFUND_SOURCE_ADMIN
+        assert r.comment == "Foo"
 
 
 @pytest.mark.django_db